Journal articles on the topic 'Jaw plate'
To see the other types of publications on this topic, follow the link: Jaw plate.
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the top 50 journal articles for your research on the topic 'Jaw plate.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.
1
Luo, Zhong Hua, and She Huan Li. "Optimization Design for Crushing Mechanism of Double Toggle Jaw Crusher." Applied Mechanics and Materials 201-202 (October 2012): 312–16. http://dx.doi.org/10.4028/www.scientific.net/amm.201-202.312.
Abstract:
This paper conducts a comprehensive study on the optimization design for crushing mechanism of double toggle jaw crusher. The optimization aim is to reduce characteristic value of moving jaw plate, to raise capacity of jaw crusher, and to ensure entrance and outlet dimensions of jaw crusher. Firstly, formulae are derived for displacement of the topmost point and the bottommost point of moving jaw plate, and for the meshing angle between moving jaw plate and fixed jaw plate. Secondly, an optimization design model is established for the crushing mechanism. Finally, with C++ programming and half-penalty function method, an optimization design program is compiled for crushing mechanism of double toggle jaw crusher. Optimization is carried out for the crushing mechanism of PEJ900×1200 double toggle jaw crusher, and the optimization result is satisfactory. In the optimized crushing mechanism, the entrance and outlet dimensions and the maximum meshing angle and horizontal strokes of the topmost point and the bottommost point of moving jaw plate completely meet the design requirements. So, this paper makes it possible to raise the quality of double toggle jaw crusher.
2
Deepak, B. B. V. L., and M. V. A. Raju Bahubalendruni. "Numerical analysis for force distribution along the swing jaw plate of a single toggle jaw crusher." World Journal of Engineering 14, no. 3 (June 12, 2017): 255–60. http://dx.doi.org/10.1108/wje-07-2016-0025.
Abstract:
Purpose The purpose of this research work is helpful for recognizing the crushing characteristics of a single toggle jaw crusher during its operation. It is useful for designing a new prototype of this kind of machine with optimal dimensions of the jaw crusher frame and the crushing chamber. Design/methodology/approach The efficiency of the jaw crusher primarily depends on the kinematic characteristics of the swing jaw plate during the crushing process. The present research work deals with the kinematic analysis of the swing jaw plate of a single toggle jaw crusher. Findings During the analysis, the system is considered as a four-bar crank rocker mechanism. The force distribution is analyzed based on the results obtained from the motion analysis of the swing jaw plate. Originality/value The movement of the swing jaw plate is explained in detail while the machine is in operation. Kinematic analysis of the liner has been performed by considering some points along the swing jaw plate. The results obtained from the movement analysis of the swing jaw plate force distribution along the liner are analyzed. From this analysis, the chamber geometry can be optimized according to the requirement for the crushing motion of different zones in the crushing chamber.
3
Polushyna, M. V., T. V. Moskalova, and V. F. Hankevich. "Static force analysis of a single toggle jaw crusher." Geo-Technical mechanics, no. 152 (2020): 254–62. http://dx.doi.org/10.15407/geotm2020.152.254.
Abstract:
There are various recommendations in domestic and foreign literature regarding the law of distribution of the crushing load along the swing plate of jaw crushers: even, linear or nonlinear. The method of load distribution along the swing jaw affects the resultant crushing force, its application point and, therefore, the forces subjected to the jaw crusher links. A feature of a single toggle jaw crusher is the strong force exerted on the eccentric shaft since the crushing forces are directly transferred to the shaft. Therefore, it is important to determine the worst design case in order to calculate the strength of crusher parts. This article represents the static study of the influence of the application point of the crushing force on the forces acting on the eccentric shaft and the toggle plate of the single toggle jaw crusher. During the study, a kinematic scheme of the mechanism of the single toggle jaw crusher in the form of a four-link crank mechanism was worked out. The dependences of the angles of the rotation of the link on the angle of the eccentric shaft rotation of the crusher were obtained, which allowed determining the trajectories of different points of the swing jaw and the sections of the moving plate which crushed feeding material during the cycle. Static force analysis of the mechanism of a single toggle jaw crusher was carried out which made it possible to understand the mechanism of torque transmission to the links of crusher, determine the forces acting on the toggle plate and the eccentrics shaft bearings, as well as the shifting of application point position of the resultant crushing force along the swing plate during one stroke. The graphs of dependencies of the forces acting on the eccentric shaft and the toggle plate on the position of application point of the crushing load were built, which made it possible to determine the worst case for calculating the strength of crushers’ joints. It is established that maximum forces subjected to the eccentric shaft and the toggle plate occur when the crushing force is applied to the bottom zone of the moving plate. Such an application corresponds to the nonlinear distribution of the crushing load along the swing jaw.
4
Vandewalle, P., M. Havard, G. Claes, and F. De Vree. "Mouvements des mâchoires pharyngiennes pendant la prise de nourriture chez le Serranus scriba (Linné, 1758) (Pisces, Serranidae)." Canadian Journal of Zoology 70, no. 1 (January 1, 1992): 145–60. http://dx.doi.org/10.1139/z92-022.
Abstract:
According to the morphology of its pharyngeal jaw apparatus, Serranus scriba can be considered as an intermediate type within the Acanthopterygians. The lower jaws are united only at their fore end. The upper pharyngeal jaws do not articulate with the skull base. Each of them consists of pharyngobranchials 2 and 3 (the latter being well developed), bearing a tooth plate, and of one posterior tooth plate, associated with two smaller tooth plates supported by epibranchials 2 and 3. The branchial musculature is of a generalized perciform type. Muscle activity generates variable cyclic movements of the pharyngeal jaws for transporting prey from the buccal cavity to the oesophagus, in cases where the prey is provided with a shell or a cuticle. Masticatory movements are not stereotyped as in more specialized fishes such as Labridae. Prey transport is more efficient when the upper and lower pharyngeal jaws retract together, either in complete synchrony or with a phase shift. This is often accompanied by downward movements of the upper jaws. The amplitude of movements of the components of the upper pharyngeal jaw may vary within one cycle. For instance, pharyngobranchial 2 could be drawn more forward, while pharyngobranchial 3 could be drawn more backward and the posterior tooth plate could move up and down independently. These movements can be induced passively by the interactions with the prey and (or) eventually by specific muscular activity as well. Stereotyped movements of other species probably allow them to meet only the requirements of a specialized diet. In contrast, the flexibility of this movement pattern allows S. scriba to explore a wider range of food types.
5
Zhangfeng, Zhao, Li Yanbiao, Li Wenhao, Zhan Xian, Zhu Xingliang, and Zhong Jiang. "Research on the biaxial compound pendulum jaw crusher based on seven-bar mechanism." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 230, no. 11 (April 16, 2015): 1876–89. http://dx.doi.org/10.1177/0954406215583889.
Abstract:
Traditional compound pendulum jaw crushers have many disadvantages such as low efficiency and uneven broken materials. This paper proposes a new biaxial compound pendulum jaw crusher to solve these problems. This paper presents the kinematic and dynamic performance of the new crushers, introduces its structure and layout features, derives the equations involving position, velocity, acceleration and kinetics, describes a workspace of the jaw crusher, analyzes the travel characteristic values and crushing force of movable jaw plates, and optimizes its structural and motion parameters through a multi-objective genetic algorithm. After the optimization process, the novel jaw crusher has little force on each hinge and large force on movable jaw plates. Specifically, the forces in the X-direction are 120,300 N for hinge C, 120,200 N for hinge D, and 195,000 N for hinge N; the forces in the Y-direction are 167,100 N, 162,800 N, and 197,900 N accordingly, while the breaking force of the movable jaw plate is 229,600 N. Experiments have been conducted. The results have clearly shown that the new biaxial compound pendulum jaw crusher has many advantages over conventional ones, such as the high crushing efficiency, even crushing, and large crushing force.
6
Yong, Jiang. "Research on the Kinematics Simulation of Out-Moving Jaw Crusher Based on Nastran." Applied Mechanics and Materials 433-435 (October 2013): 63–66. http://dx.doi.org/10.4028/www.scientific.net/amm.433-435.63.
Abstract:
In this paper, out-moving jaw crusher machine is regarded as the research object and we established the simulation model of virtual prototype based on Nastran. Through the simulation analysis of the movement process, trajectories of moving jaw side plate and a movable jaw toggle plate and related parameters were obtained and compared and verify the simulation model and theory model. The results show that: the simulation model reflects the motion characteristics of the theoretical model well. So it provides theoretical reference for improvement of dynamic performance analysis and structure design of jaw crusher and has important application value in engineering.
7
Mu, Fu Sheng, Hui Li, Xing Xue Li, and Hong Zhi Xiong. "Jaw Crusher Based on Discrete Element Method." Applied Mechanics and Materials 312 (February 2013): 101–5. http://dx.doi.org/10.4028/www.scientific.net/amm.312.101.
Abstract:
In order to analyze the force condition and crushing power of crusher teeth plate, the discrete element method models of jaw crusher and double-cavity jaw crusher are set up respectively using EDEM, a kind of software for discrete element analysis. Meanwhile, the working process, the loading force on the teeth plate and crushing power are simulated. The results show that: the rationality of the DEM simulation is declared, and the crushing process of the particles is also shown intuitively. The loading force condition and the crushing power of the moving jaw teeth plate serve as basis for its abrasion and energy consumption respectively.
8
Dawood, Andrew, Susan Tanner, and Iain Hutchison. "Computer Guided Surgery for Implant Placement and Dental Rehabilitation in a Patient Undergoing Sub-Total Mandibulectomy and Microvascular Free Flap Reconstruction." Journal of Oral Implantology 39, no. 4 (August 1, 2013): 497–502. http://dx.doi.org/10.1563/aaid-joi-d-11-00142.
Abstract:
A 58-year-old patient presented with an extensive, destructive, recurrent pleomorphic adenoma occupying the mandibular body and the soft tissues of the mouth and neck. Resection of the mandible from right ramus to left condylar process, and implant rehabilitation in both jaws with fixed bridgework was planned. Comprehensive presurgical prosthetic work up was carried out to record the existing dental relationship and guide all stages of the reconstruction. The jaw was first grafted with a segmented, fibular microvascular free-flap, which was fixed in place with a fixation plate prebent on a Rapid Prototype Anatomical Model of the jaw. Reconstruction with implant supported fixed partial dentures took place to the dental scheme planned preresection, using a computer guided approach to implant placement in the complex and unfamiliar anatomy of the extensively grafted mandible. This approach facilitated and expedited implant surgery such that treatment could take place using a minimally invasive approach relatively soon after surgery, prior to commencement of radiotherapy, and highlights the importance of a multidisciplinary approach to treatment for patients having extensive surgery to the jaws. The patient's personal assessment 2 years post surgery was recorded using 1999 University of Washington Quality of Life Questionnaire.
9
Li, Shu Jun, Xiao Hang Wan, Zhao Wei Dong, and Wei Zhi Hou. "Optimization Designing of Jaw Crusher Teeth Plate Shape Based on the FEM Method." Advanced Materials Research 614-615 (December 2012): 333–36. http://dx.doi.org/10.4028/www.scientific.net/amr.614-615.333.
Abstract:
The quantity of jaw crusher teeth plate consumed in crashing process directly affects the costs. Based the FEM method, the 3-D jaw crusher teeth plate shape model is established in this paper. This paper studies the stress distribution laws with three types of teeth shape. Through contrasting the results of analysis and data of malfunction teeth plate, it is can be drawing that the stress distribution laws, which can be used in optimizating design of teeth plate shape. It extends the using life and improves the crushing efficiency.
10
Reimchen, T. E. "PREDATOR HANDLING FAILURES OF LATERAL PLATE MORPHS IN GASTEROSTEUS ACULEATUS: FUNCTIONAL IMPLICATIONS FOR THE ANCESTRAL PLATE CONDITION." Behaviour 137, no. 7-8 (2000): 1081–96. http://dx.doi.org/10.1163/156853900502448.
Abstract:
AbstractThe completely plated morph in the threespine stickleback (Gasterosteus aculeatus) is considered to be the ancestral plate condition and is the predominant morph inhabiting marine waters and numerous northern freshwaters. Evolutionary aspects of this distribution have been widely addressed yet functional mechanisms remain obscure. Experiments described here using the common piscivore (Oncorhynchus clarki) show that the posterior plates of G. aculeatus interfere with the swallowing abilities of the piscivore, possibly by disrupting pharyngeal jaw retraction, and this leads to increased escape opportunities of the stickleback. The advantage of the completely plated condition is most expressed at higher ratios of prey diameter to predator mouth diameter and appears to have a defensive effect comparable to that of dorsal and pelvic spines. This attribute, combined with the physical protection that plates offer against puncturing, would be particularly beneficial where there is high probability of capture by toothed predators. Such a selection regime appears to characterize the predominantly limnetic and pelagic habitats where marine stickleback are found and may account for the wide geographical distribution of the completely plated morph and its persistence from the Miocene.
11
Brazeau, Martin D. "A new genus of rhizodontid (Sarcopterygii, Tetrapodomorpha) from the Lower Carboniferous Horton Bluff Formation of Nova Scotia, and the evolution of the lower jaws in this group." Canadian Journal of Earth Sciences 42, no. 8 (August 1, 2005): 1481–99. http://dx.doi.org/10.1139/e05-041.
Abstract:
Letognathus gen. nov. is described from the Lower Carboniferous (Tournaisian) Horton Bluff Formation. Included in this genus is the species Letognathus hardingi (Dawson 1868), which was originally assigned toRhizodus and later toStrepsodus, but it is distinct from these genera in tooth morphology and the presence of several more primitive rhizodontid characters. By contrast with these latter more derived genera, the parasymphysial plate contacts the first coronoid; the first coronoid bears a row of lingually deflected teeth, the tooth striations occur around the entire circumference of the crown and are much finer and less regular than those ofStrepsodus, and marginal tooth row reaches anteriorly to the dentary symphysis. Phylogenetic analysis indicates that rhizodontid jaws primitively bear symphysial tusks; slender recumbent teeth; an anterior projection of the dentary over the anteromesial depression for the median symphysial plate and shows the highly derived jaws ofStrepsodus andRhizodus evolved within the Rhizodontida, rather than as primitive characters for the group. This new jaw material supports earlier models of mandibular kinesis and shows that the coronoid fangs were oriented such as to facilitate kinesis. Rhizodontid jaw evolution seems to be marked by parallelisms with tristichopterids and early tetrapods.
12
Ahlberg, Per Erik, and Jennifer A. Clack. "Lower jaws, lower tetrapods–a review based on the Devonian genus Acanthostega." Transactions of the Royal Society of Edinburgh: Earth Sciences 89, no. 1 (1998): 11–46. http://dx.doi.org/10.1017/s0263593300002340.
Abstract:
AbstractThe lower jaw of the Devonian tetrapod Acanthostega is described for the first time. Redescriptions are provided for the lower jaws of the elpistostegid Panderichthys, the Devonian tetrapods Elginerpeton, Obruchevichthys, Metaxygnathus, Ventastega and Ichthyostega, and the Carboniferous tetrapods Crassigyrinus, Megalocephalus and Gephyrostegus. The character distri- butions thus revealed differ considerably from previous accounts, particularly in the wide distribution of certain primitive characters. Meckelian ossification in the middle part of the jaw is widespread among Devonian tetrapods, being demonstrably absent only in Acanthostega. Among Carboniferous tetrapods, a tooth-bearing parasymphysial plate is shown to be present in Crassigyrinus and Megalocephalus (having already been demonstrated by other authors in Whatcheeria and Greererpeton). A phylogenetic analysis of 26 early tetrapods including all the aforementioned genera, scored for 51 lower jaw characters, produces at least 2,500 equally parsimonious trees. However, the lack of resolution lies largely in a big top end polychotomy containing anthracosaurs, temnospondyls, seymouriamorphs, microsaurs and a nectridean-amniote clade. Below this polycho- tomy, which may correspond approximately to the tetrapod crown group, there is a well-resolved stem-group containing, in descending order, Megalocephalus, Greererpeton, Crassigyrinus, (jaws associated with) Tulerpeton, Whatcheeria, Acanthostega, Metaxygnathus, Ichthyostega, Ventastega and Metaxygnathus (unresolved), an Elginerpeton-Obruchevichthys clade, and Panderichthys. This conflicts with recently published phylogenies by Coates and Lebedev & Coates, which place Tulerpeton and all post-Devonian tetrapods in the amphibian or amniote branches of the tetrapod crown group.
13
Okechukwu, C., OA Dahunsi, PK Oke, IO Oladele, M. Dauda, and BM Olaleye. "DESIGN AND OPERATIONS CHALLENGES OF A SINGLE TOGGLE JAW CRUSHER: A REVIEW." Nigerian Journal of Technology 36, no. 3 (June 30, 2017): 814–21. http://dx.doi.org/10.4314/njt.v36i3.22.
Abstract:
A review on the design and operations challenges of a single toggle jaw crusher is presented. Strength and fracture toughness of the material to be crushed are intrinsic properties that determine the time and energy required to crush the material. Economy of the crushing process is partly dependent on the angle of nip. Productivity of the crusher can be improved upon by increasing the eccentricity of the eccentric shaft, use of reversible jaws, bush bearing and easily adjustable toggle plate. Vibrations and fatigue cracks in the crusher frame will be nipped in the bud through structural analysis at design stage. Determination of the optimal angle of inclination of the toggle plate, development of jaws with varying wear rate along the crushing chamber, and development of comminution energy models that take into cognizance relevant crushing parameters for simulation and optimization of the crushing process are some areas that require close attention. Â http://dx.doi.org/10.4314/njt.v36i3.22
14
Tuff, Mark A. "Contamination of Silicate Rock Samples due to Crushing and Grinding." Advances in X-ray Analysis 29 (1985): 565–71. http://dx.doi.org/10.1154/s0376030800010727.
Abstract:
AbstractThis study was done to learn which elements are being contributed as contaminants in the sample preparation equipment used at the New Mexico Institute of Mining and Technology (NMIMT). The apparatus investigated included a steel jaw crusher, a ceramic jaw crusher, two aluminum plates as a crusher and grinder, a steel spinning plate pulverizer, an alumina ceramic spinning plate pulverizer, an automated agate mortar and pestle, a high speed spectromill grinder with a tungsten carbide mortar and pestle, and the halves of a sliced quartzite cobble. Major-element Oxides and trace elements were analyzed by x-ray fluorescence. Some of the trace elements were analyzed by instrumental neutron activation analysis. The expected contamination of ferroalloy elements from steel were present in varying quantities, as were tungsten, tantalum and cobalt fron the tungsten carbide. There was unexpected contamination of sulfur and lead from the steel pulverizer.
15
Valášek, Jiří, Kamil Řehák, David Krpalek, Veronika Ebringerová, and Zdeněk Florian. "Finite Element Analysis of Mandible Reconstruction Plate in the Case of Symphysis Fracture." Advanced Materials Research 472-475 (February 2012): 1524–27. http://dx.doi.org/10.4028/www.scientific.net/amr.472-475.1524.
Abstract:
The presented work is focused on stress - strain analysis of a reconstruction plate. For this problem the computational modelling was chosen with using finite element method. Mandible was created based on the methods of Reverse Engineering and CT images. Using these methods a STL model of mandible with cortical and cancellous bone tissue was created. A volume model of lower jaw with applied reconstruction plate was created in CAD software. A Symphysis fracture of lower jaw was modeled in calculation program ANSYS. The cancellous bone tissue is modeled with different mechanical properties, which corresponds to the varying quality of this tissue. In this work an influence of varying quality of cancellous bone tissue to von Mises stress is observed.
16
Godfrey, Stephen J., and Robert B. Holmes. "A tetrapod lower jaw from the Pennsylvanian (Westphalian A) of Nova Scotia." Canadian Journal of Earth Sciences 26, no. 5 (May 1, 1989): 1036–40. http://dx.doi.org/10.1139/e89-084.
Abstract:
The left half of a tetrapod lower jaw, from the Parrsboro Formation (Pennsylvanian, Westphalian A) of Nova Scotia, is preserved as a natural mold in a sandstone. Most of the features of this lower mandible are primitive for tetrapods or non-ichthyostegalian tetrapods. Although the presence of an adsymphysial tooth plate in this specimen is regarded as the retention of an osteolepiform feature, the tusk and replacement pit on this dermal bone may be unique to this taxon. The poor preservation of the lower jaws associated with some previously described Paleozoic tetrapods, together with the unique features in other early tetrapod jaws, precludes the reference of this mandible to any known tetrapod taxon.
17
Zhang, Li Zhen, Xiao Qing Shen, Shou Qi Cao, and Chao Lv. "Application of Orthogonal Experiments in Simulation and Optimization of Jaw Crusher on Traveling Characteristic Value of Moving Jaw." Applied Mechanics and Materials 215-216 (November 2012): 101–4. http://dx.doi.org/10.4028/www.scientific.net/amm.215-216.101.
Abstract:
In this paper, the traveling characteristic value of moving jaw of jaw crusher is studied by optimization experiment. The traveling characteristic value can reflect the relationship between capacity and energy consumption of jaw crusher. When it is around 2.5, the capacity of jaw crusher is high and the energy consumption is low. The virtual prototype model of jaw crusher was established and an orthogonal experiment was done to find the effect of four design variables on the traveling characteristic value. The results show that the angle of oscillation is the most important influencing factor and the least one is the length of toggle plate. The length of link bar and the eccentricity of eccentric shaft are less important factors. And the better design parameter values of PE1500*1800 was obtained.
18
POMORY, CHRISTOPHER M., JERRY H. CARPENTER, and JOHN H. WINTER. "Amphicutis stygobita, a new genus and new species of brittle star (Echinodermata: Ophiuroidea: Ophiurida: Amphilepididae) found in Bernier Cave, an anchialine cave on San Salvador Island, Bahamas." Zootaxa 3133, no. 1 (December 16, 2011): 50. http://dx.doi.org/10.11646/zootaxa.3133.1.3.
Abstract:
Amphicutis stygobita is a new genus and new species of ophiuroid found in Bernier Cave, an anchialine cave on San Salvador Island, Bahamas. The species is small (disk diameter 3–4 mm) with short arms (2–2.5X disk diameter). Dorsal disk features include imbricated scales, and oval radial shields separated by a column of scales. Ventral disk features include imbricated scales, genital scales flat and thin, no bursal sacs, second tentacle pore of oral frame outside mouth slit, oral shields small ovals similar in appearance to disk scales, two to three oral papillae per jaw side with the proximal papillae usually in the infradental position, and ventral tooth at the apex of each jaw broadly rounded. The arms are the most distinctive feature. Dorsal arm plates are small diamond-oval shaped and separated from one another by a gap equal to the arm plate length. Ventral arm plates are small figure-8 shaped and separated from one another by a gap equal to the arm plate length. Lateral arm plates meet medially on dorsal and ventral sides and make up most of an arm segment. Each lateral arm plate bears two arm spines. Disk and arms are often formed by soft tissue outlining plates and scales, but lacking significant calcification. A raised skin persists after calcification, from which the genus name derives. The species is named for its aquatic cave-dwelling habit, apparently endemic to a single cave, and may be unique among ophiuroids in being restricted to a cave environment.
19
Armencea, Gabriel, Dan Gheban, Florin Onisor, Ileana Mitre, Avram Manea, Veronica Trombitas, Madalina Lazar, Grigore Baciut, Mihaela Baciut, and Simion Bran. "Histological Change in Soft Tissue Surrounding Titanium Plates after Jaw Surgery." Materials 12, no. 19 (September 30, 2019): 3205. http://dx.doi.org/10.3390/ma12193205.
Abstract:
The aim of this study was to evaluate the microscopic structure of soft tissue covering titanium plates and screws used in jaw surgery (mandible fracture and orthognathic surgery), after a minimum period of 12 months from insertion, and to quantify the presence of any metallic particles. Periosteum covering the osteosynthesis plates was removed from 20 patients and examined by light microscopy in order to assess the cell morphological changes and the possibility of metal particles presence in the soft tissue. Local signs of tissue toxicity or inflammation were taken into consideration when evaluating the routine removal of titanium maxillofacial miniplates. No signs of screw loosening or acute inflammation were detected on the osteosynthesis site, but de-coloration of the periosteum was seen, and metallic particles were observed to have migrated into the soft tissues. Even if the titanium is well-tolerated by the human body in time, without severe local or general complications, our findings suggest that plate removal should be considered after bone healing has occurred.
20
Widiastuti, Maria Goreti, Marsetyawan HNE Soesatyo, Rahardyan Magetsari, and Alva Edy Tontowi. "EVALUASI KOMPLIKASI PLATE EXPOSURE PASCA RESEKSI AMELOBL ASTOMA MANDIBULA DENGAN REKONSTRUKSI PELAT TITANIUM DI RSUP DR. SARDJITO YOGYAKARTA." Jurnal Teknosains 5, no. 2 (August 30, 2017): 81. http://dx.doi.org/10.22146/teknosains.24222.
Abstract:
Resection of the jaw is a primary option of treatment in mandibular ameloblastoma with bone damage. Mandibular resection will cause mandibular stability disturbance due toloss of some part of the bone. Instability of the mandible can cause aesthetic, physiological, and psychological malfunctioning. To restore its stability, installment of mandibular reconstruction plate on the remaining mandibular by using screws. However, it is not uncommon that plate exposure occurs following mandibular reconstruction, caused by inaccurate adaptation of the plates to the mandibular bone. A 3D stereolithography modelcan help provide the best assesment on the bone defect, plan the making of the more easily pre-operative curved plates and provide more accurate faster surgery time. Objective: To evaluate plate exposure after mandibular resection with titanium reconstruction plates in Dr. SardjitoHospital. Case report: A case was reported on mandibular reconstruction after resection of ameloblastoma with titanium plate performed in Dr. Sardjito Hospital that experienced intra-oral plate exposure and oro-cutaneous fistula on the left mandible. The clinical evaluation showed the curved titanium plate did not adapt well with the remaining mandibular bone; therefore, the titanium plate was removed without replacing it with a new plate. Inappropriate adaptationof curved titanium plate is one of the main causes of plate exposure. The use of a 3D stereolithography model is very helpful for the success of mandibular reconstruction.
21
Wang, Ming Yao. "Accurate and Reset Turning Eccentric Eccentric Fixture Developed Parts." Advanced Materials Research 971-973 (June 2014): 329–32. http://dx.doi.org/10.4028/www.scientific.net/amr.971-973.329.
Abstract:
Add two coupling plate between the chuck holder and three-jaw chuck, and the two coupling plate converted to a deflection angle eccentricity L. The eccentric workpiece to be machined coupling plate from A through L and the coupling plate B out on the scale to determine the minimum size accuracy of up to 0.02mm to overcome the technical defects existing processing eccentric parts , providing precise determination eccentricity , and can reset the eccentric parts machining fixture .
22
Agraha, Arya Kusuma, Masykur Rahmat, and Rahardjo . "PEMAKAIAN MEDICAL RAPID PROTOTYPING UNTUK PREKONTUR PLAT REKONSTRUKSI PADA RESEKSI MANDIBULA." ODONTO : Dental Journal 4, no. 2 (December 1, 2017): 149. http://dx.doi.org/10.30659/odj.4.2.149-158.
Abstract:
Background: In the case of mandibular resection that leaves a large mandibular bone defect, a mandibular reconstruction is required to restore functional and postoperative aesthetic factors. Mandibular reconstruction plate installation on mandibular resection is very important but difcult to achieve maximum results. The formation of reconstruction plates can be preoperative and intraoperative. Preoperative stereolithography (medical rapid prototyping/MRP) can be used to form rapid and accurate plates (precontours). Objective: Report the use of MRP as an alternative tool to precontour mandibular reconstruction plate.Case management: Reported reconstruction of mandibular defects in one case of hemimandibulectomy and two cases of segmental resection with avascular iliac bone grafts using MRP through a computer-aided design and computer aided manufacture procedure (CAD/CAM) to establish preoperative reconstruction plates (precontour) so the surgery doesn’t take long time to reconstruct, by forming a mandibular models under normal circumstances.Result: The formation of a reconstruction plates (precontour) using MRP (medical rapid prototyping) with CAD / CAM procedure gives results in accordance with the original form.Conclusions: The making of MRP through CAD / CAM procedure gives maximal result resembling the form of mandibular model. The MRP models get an accurate picture of the patient’s jaw as a pre contour tools for reconstruction plate. The formation of the reconstruction plates (precontour) with these MRP model is obtained from CAD / CAM and provides a normal jaw image, so that preoperative precontouring will give good and maximum result on the reconstruction plates made under the MRP models.
23
Corso, Paola Fernanda Cotait de Lucas, Sara Regina Todero, Aline Monise Sebastiani, Leandro Eduardo Kluppel, Nelson Luis Barbosa Rebellato, and Rafaela Scariot. "Jaw osteonecrosis after dental implants associated with oral bisphosphonates – case report of resection of mandible." RSBO 1, no. 2 (October 16, 2017): 98. http://dx.doi.org/10.21726/rsbo.v1i2.410.
Abstract:
Osteonecrosis of the jaw is associated with defects in vascularization and with the use of oral bisphosphonates. Osseous exposition and infection may occur. Recommended treatment is variable, from antibiotic medication, bony decortication to resections of the mandible in severe cases. Reconstruction of mandible, in cases of resections is essential for maintaining esthetic profile and adequate form and function. Objective: To report a case about the dangers oforal bisphosphonates in association with invasive procedures such as dental implants Case report: Female patient, 64 years-old, with osteonecrosis of the jaw caused by use of oral bisphosphonates after rehabilitation with dental implants. She had an edentulous and atrophic mandible and poor healthy. After diagnosis, partial resection of the jaw was performed together with the reconstruction with titanium plate, with no success. Then, iliac bone graft fixed by plates and screws was attempted, again with no success. Conclusion: Despiteof the small number of cases of osteonecrosis associated with oral bisphosphonate reported in the literature, a simple implant surgery could result in adverse consequences if the use of this medication were overlooked in the anamnesis.
24
Paola Fernanda Cotait de Lucas Corso, Sara Regina Todero, Aline Monise Sebastiani, Leandro Eduardo Kluppel, Nelson Luis Barbosa Rebellato, Delson João da Costa, and Rafaela Scariot. "Jaw osteonecrosis after dental implants associated with oral bisphosphonates – case report of resection of mandible." RSBO 14, no. 2 (June 29, 2017): 98–105. http://dx.doi.org/10.21726/rsbo.v14i2.646.
Abstract:
Osteonecrosis of the jaw is associated with defects in vascularization and with the use of oral bisphosphonates. Osseous exposition and infection may occur. Recommended treatment is variable, from antibiotic medication, bony decortication to resections of the mandible in severe cases. Reconstruction of mandible, in cases of resections is essential for maintaining esthetic profile and adequate form and function. Objective: To report a case about the dangers of oral bisphosphonates in association with invasive procedures such as dental implants Case report: Female patient, 64 years-old, with osteonecrosis of the jaw caused by use of oral bisphosphonates after rehabilitation with dental implants. She had an edentulous and atrophic mandible and poor healthy. After diagnosis, partial resection of the jaw was performed together with the reconstruction with titanium plate, with no success. Then, iliac bone graft fixed by plates and screws was attempted, again with no success. Conclusion: Despite of the small number of cases of osteonecrosis associated with oral bisphosphonate reported in the literature, a simple implant surgery could result in adverse consequences if the use of this medication were overlooked in the anamnesis.
25
Santosa, Aa, and Muhamad Jimi. "PENGARUH PERBEDAAN KOMPOSISI MANGAN PADA KOMPONEN JAW PLATE TERHADAP KEKERASAN DAN STRUKTUR MIKRO." INFOMATEK 20, no. 1 (May 20, 2018): 51. http://dx.doi.org/10.23969/infomatek.v20i1.881.
Abstract:
Telah dilakukan penelitian tentang pengaruh perbedaan komposisi Mangan pada komponen Jaw Plate terhadap Kekerasan dan struktur mikro. Pengujian ini dilakukan untuk mengetahui sifat mekanik dari baja Mangan Austenitik meliputi pengujian kekerasan skala Rockwell C yang bertujuan untuk mengetahui kekerasan dan pengujian impak untuk mengetahui ketangguhan material tersebut. Metoda pengujian impak yang dilakukan adalah metode charpy. Dari hasil penelitian diperoleh kondisi as cast, penambahan Mn akan menaikan harga kekerasan dan menaikan harga impak. Begitu pula pada kondisi setelah dilakukan proses heat treatment. Dilakukan proses metalograpy untuk melihat perubahan fasa pada struktur mikro as cast dan setelah dilakukan proses heat treatment, struktur mikro yang terjadi pada baja Mangan Austenitik adalah karbida komplek, α+(FeMn)3C.
26
Pollock, Richard A., Ted W. Brown, and David M. Rubin. "“Phossy Jaw” and “Bis-phossy Jaw” of the 19th and the 21st Centuries: The Diuturnity of John Walker and the Friction Match." Craniomaxillofacial Trauma & Reconstruction 8, no. 3 (September 2015): 262–70. http://dx.doi.org/10.1055/s-0035-1558452.
Abstract:
Some 200 years ago, workers developed gingivitis, periodontal disease, alveolar crest bone sequestra, and draining fistulae after exposure to phosphorous fumes and phosphorous paste in the manufacture of the friction match. Many also suffered loss of teeth and pathologic fracture of the mandible. Known as “phossy jaw,” the constellation rather abruptly vanished following the International Berne Convention of 1906. Today, “bis-phossy jaw” (bisphosphonate-induced osteonecrosis of the jaw) has surfaced with pathologic fractures and other features common to its predecessor, “phossy jaw.” This modern equivalent is reported with ever-increasing frequency and is presented here in the format of a brief historical review and a case report that includes segmental en bloc extirpation of necrotic mandible and pain-free salvage. Computerized imagery and three-dimensional printing technology were successfully chosen to create and apply a custom titanium bone plate, without free-tissue transfer.
27
Davudov, M. M., Ch R. Rahimov, A. A. Akhundov, V. K. Alikuliev, D. A. Safarov, Sh Sh Osmanov, and V. Z. Dobrokhotova. "Ameloblastic carcinoma of lower jaw (case report)." Head and neck tumors (HNT) 8, no. 4 (January 13, 2019): 61–67. http://dx.doi.org/10.17650/2222-1468-2018-8-4-61-67.
Abstract:
The study objectiveis to report a case of mandibular ameloblastoma.Materials and methods. A 30-year-oldfemale patient presented with swelling of the right mandibular region that appeared 8 months ago and has been slowly increasing. The patient had no other symptoms, such as pain, anesthesia, paresthesia, difficulty swallowing, mouth opening, speech disorders, fever, chills, or weight loss. Orthopantomography revealed pronounced bone resorption in the right portion of the mandibular body. Computed tomography showed a cystic cavity in this area. After incisional biopsy, the patient was diagnosed with ameloblastic carcinoma. We performed segmental mandibular resection and installed a reconstructive plate to restore mandibular integrity. We also performed selective cervical lymph node dissection (levels Ia and Ib).Results.One yearpostoperatively, the results were considered aesthetically and functionally satisfactory.Conclusion.We observed an aggressive disease phenotype with extensive localized bone destruction, typical of ameloblastic carcinoma. Extensive excision of the primary tumor and selective cervical lymph node dissection without radiotherapy ensured a relapse-free period during patient’s follow up.
28
Park, Si-Myung, Soyeon Park, Jieun Park, Minwook Choi, Laehyun Kim, and Gunwoo Noh. "Design process of patient-specific osteosynthesis plates using topology optimization." Journal of Computational Design and Engineering 8, no. 5 (September 2, 2021): 1257–66. http://dx.doi.org/10.1093/jcde/qwab047.
Abstract:
Abstract To reduce complications related to the osteosynthesis plating system, the use of a patient-specific plate design was proposed. However, the issue of associated complications is still critical. Because existing patient-specific plate designs have mainly relied on parametric studies, a design method is needed that considers the complex factors influencing the performance of the reconstruction and that can be generalized for various patients. The goal of this study was to propose a design process that can strengthen the advantages of a customized plate to reduce patient discomfort and ensure the stability of surgery. We applied topology optimization to design a plate for a case of mandibular condyle fracture. The optimization problem was set to maximize the plate stiffness and minimize its volume. The performance of the designed plate was evaluated using finite element simulations, which approximated the various mastication states. Plate performance was then compared with the performance of two conventional plating systems: bent plates and computerized numerical control-machined plates. The conventional plate models used a pair of mini-plates, and the bent plate was modeled by conducting bending simulation. Each finite element model was appraised via masticatory simulations under static molar-jaw-closing conditions. Differences in stress concentration were noted between the model with bent plates and the model with computerized numerical control-machined plates. The most severe stress concentration occurred in the bent plate, which was affected by the residual stress from the bending process. In comparison with the two conventional plates, the newly designed plate exhibited significantly improved biomechanical stability in terms of stress and stiffness and had approximately twice the endurance capability against fractured bone separation. The newly designed plate was designed to have a balance between volume and plate stiffness, and it showed superior stability over the conventional plates. The proposed plate design process using topology optimization is an effective method not only because it enhances the advantages of the patient-specific plate but also because it can be applied in various reconstruction cases.
29
Opris, Horia, Gabriel Armencea, Avram Manea, Ileana Mitre, Mihaela Baciut, Florin Onișor, Florica Imre-Lucaci, et al. "Titanium Periimplant Tissue Alterations: A Prospective Cohort Plate Retrieval Study." Applied Sciences 11, no. 14 (July 8, 2021): 6315. http://dx.doi.org/10.3390/app11146315.
Abstract:
Commercially pure titanium and titanium alloys have been extensively used in materials to reconstruct the facial skeleton in different forms and sizes. There is yet to be a consensus on removing (or not) the plates and screws after osteosynthesis. Our study tries to investigate the adjacent tissues of the titanium plates used in jaw surgery using inductively coupled plasma optical emission spectrometry. Twenty samples of soft tissue surrounding the titanium plates were retrieved 1 year after placement (fracture sites or orthognathic surgery) and were investigated using inductively coupled plasma optical emission spectrometry. The study found 1.06 ppm titanium in the adjacent soft tissues. Even if there are no clinical signs of the presence of titanium in the soft tissues, our findings suggest that a plate removal is a feasible option for patients to avoid local complications due to titanium migration.
30
FRIEDMAN, Matt, Stephanie E. PIERCE, Michael COATES, and Sam GILES. "Feeding structures in the ray-finned fish Eurynotus crenatus (Actinopterygii: Eurynotiformes): implications for trophic diversification among Carboniferous actinopterygians." Earth and Environmental Science Transactions of the Royal Society of Edinburgh 109, no. 1-2 (March 2018): 33–47. http://dx.doi.org/10.1017/s1755691018000816.
Abstract:
ABSTRACTThe Permo-Carboniferous eurynotiforms show conspicuous modifications to postcranial and cranial morphology relative to primitive actinopterygian conditions, and represent an important early example of functional experimentation within ray-finned fishes. Although eurynotiforms are represented by abundant articulated fossil material, the internal anatomy of the group is not well known. Microcomputed tomography (μCT) of Eurynotus crenatus from the early Carboniferous (Viséan) Wardie Shales Member of the Gullane Formation of Wardie, Scotland provides detailed information on the jaws, palate and dentition. The lower jaw is deep and bears a well-developed convex dental plate on the prearticular/coronoids. The dentary bears a dorsally directed posterior process and lacks any obvious marginal dentition. The prearticular bears a low coronoid process. Apart from the first and second dermopalatines, and a likely accessory vomer, bones of the palate are tightly sutured or fused. The upper dental plate comprises a longitudinal, concave horizontal dental surface that occludes with the convex lower toothplate, and a more vertical region consisting of anastomosing ridges. The parasphenoid has a narrow anterior corpus and a broad posterior stalk that bears a pronounced midline notch. The smooth, irregularly punctated surfaces of the dental plates are formed by closely packed teeth with conjoined crowns, providing clues to the evolution of the more monolithic toothplates of Amphicentrum from the peg-like teeth reported in the earliest and most anatomically generalised eurynotiforms. The feeding apparatus shows many qualitative and quantitative features consistent with the processing of hard prey items. Eurynotus and its relatives show the first clear example of jaw and dental structures consistent with durophagy among actinopterygians. The origin of the group in the early Carboniferous is suggestive of diversification into newly available ecological roles in the aftermath of the end-Devonian extinction.
31
Chen, Yuhui, Guoshuai Zhang, Ruolin Zhang, Timothy Gupta, and Ahmed Katayama. "Finite Element Study on the Wear Performance of Movable Jaw Plates of Jaw Crushers after a Symmetrical Laser Cladding Path." Symmetry 12, no. 7 (July 7, 2020): 1126. http://dx.doi.org/10.3390/sym12071126.
Abstract:
At present, research on the influence of friction heat on the wear resistance of laser cladding layers is still lacking, and there is even less research on the temperature of laser cladding layers under different loads by a finite element program generator (FEPG). After a symmetrical laser cladding path, the wear performance of the moving jaw will change. The study of the temperature change of the moving jaw material in friction provides a theoretical basis for the surface modification of the moving jaw. The model of the column ring is built in a finite element program generator (FEPG). When the inner part of the column is WDB620 (material inside the cylinder) and the outer part is ceramic powder (moving jaw surface material), the relationship between the temperature and time of the contact surface is analyzed under the load between 100 and 600 N. At the same time, the stable temperature, wear amount, effective hardening layer thickness, strain thickness, and iron oxide content corresponding to different loads in a finite element program generator (FEPG) were analyzed. The results showed that when the load is 300 N, the temperature error between the finite element program generator (FEPG) and the movable jaw material is the largest, and the relative error is 4.3%. When the load increases, the stable temperature of the moving jaw plate increases after the symmetrical laser cladding path, and the wear amount first decreases and then increases. The minimum wear amount appears at a load of 400 N and a temperature of 340 °C; the strain thickness of the sample material increases gradually, and the effective hardening layer thickness increases. However, when the load reaches 400 N, the thickness of the effective hardening layer changes little; the content of Fe decreases gradually, and the content of FeO and Fe2O3 increases. The increase of the moving jaw increases in turn the temperature of the laser cladding layer of the test jaw material, which intensifies the oxidation reaction of the ceramic powder of the laser cladding layer.
32
HIRANUMA, KENJI. "Impression taking procedures of plate dentures. Creep specifications in the mucosa of the jaw." Nihon Hotetsu Shika Gakkai Zasshi 31, no. 1 (1987): 12–15. http://dx.doi.org/10.2186/jjps.31.12.
33
Hori, K., T. Ono, and T. Nokubi. "Coordination of Tongue Pressure and Jaw Movement in Mastication." Journal of Dental Research 85, no. 2 (February 2006): 187–91. http://dx.doi.org/10.1177/154405910608500214.
Abstract:
The tongue plays an important role in mastication and swallowing by its contact with the hard palate. Using an experimental palatal plate with 7 pressure sensors, and recording jaw movement using mandibular kinesiography, we assessed, in healthy subjects, the coordination of tongue and jaw movements during the entire masticatory sequence of solids, by measuring tongue pressure against the hard palate. Tongue pressure appeared during the occlusal phase, reached a peak near the start of opening, and disappeared during opening. Specific patterns in order, duration, and magnitude of tongue pressure were seen at the 7 pressure sensors in each chewing stroke. Magnitude and duration were significantly larger in the late stage of chewing (8 strokes before initial swallowing) than in the early stage (until 8 strokes after starting mastication). The normal pattern of tongue contact against the hard palate, control of tongue activity, and coordination with jaw movement during mastication is described.
34
Takamatsu, Naoya. "Effect of Relief at the Median Palatal Plate on Denture-supporting Ability." International Journal of Prosthodontics and Restorative Dentistry 7, no. 4 (2017): 117–23. http://dx.doi.org/10.5005/jp-journals-10019-1189.
Abstract:
ABSTRACT Aim A new maxillary palatal plate-form device that simultaneously measures clenching force and subsidence of the palatal mucosa at the onset of jaw clenching pain was developed to ascertain the effect of median palatal plate relief on denture-bearing ability. Materials and methods In 15 dentulous subjects, pseudo-palatal plates were affixed to the palatal mucosa; anterior splints were affixed as maxillary references for measuring subsidence upon transmission of the clenching force through a pressurizing splint affixed to the mandible. The relief at the median palatal plate was categorized as: No-relief, 0.23 mm relief, and 0.46 mm relief. Subjects clenched their jaws until they experienced pain. The clenching force and subsidence of the palatal mucosa were simultaneously measured and compared across relief categories, and their relationship to the extent of relief at the onset of pain was evaluated. Results At the onset of pain, both clenching force and subsidence of the palatal mucosa in the relief conditions were significantly greater than those in the no-relief condition (p < 0.05). In some patients, both clenching force and subsidence of the palatal mucosa decreased with increase in relief. Conclusion Relief at the median palatal plate effectively increases the bearing ability of the palatal part. However, the range and extent of relief might vary, depending on oral conditions. Clinical significance Using this approach, the relief area of maxillary full dentures suitable for individual patients was determined in an objective and convenient manner and the accuracy of denture treatments was improved. This could improve the quality of life of patients wearing dentures. How to cite this article Tanaka S, Sato Y, Kitagawa N, Shimodaira O, Isobe A, Takamatsu N, Omori T. Effect of Relief at the Median Palatal Plate on Denture-supporting Ability. Int J Prosthodont Restor Dent 2017;7(4):117-123.
35
Kuratani, Shigeru, Yoshiaki Nobusada, Naoto Horigome, and Yasuyo Shigetani. "Embryology of the lamprey and evolution of the vertebrate jaw: insights from molecular and developmental perspectives." Philosophical Transactions of the Royal Society of London. Series B: Biological Sciences 356, no. 1414 (October 29, 2001): 1615–32. http://dx.doi.org/10.1098/rstb.2001.0976.
Abstract:
Evolution of the vertebrate jaw has been reviewed and discussed based on the developmental pattern of the Japanese marine lamprey, Lampetra japonica . Though it never forms a jointed jaw apparatus, the L. japonica embryo exhibits the typical embryonic structure as well as the conserved regulatory gene expression patterns of vertebrates. The lamprey therefore shares the phylotype of vertebrates, the conserved embryonic pattern that appears at pharyngula stage, rather than representing an intermediate evolutionary state. Both gnathostomes and lampreys exhibit a tripartite configuration of the rostral–most crest–derived ectomesenchyme, each part occupying an anatomically equivalent site. Differentiated oral structure becomes apparent in post–pharyngula development. Due to the solid nasohypophyseal plate, the post–optic ectomesenchyme of the lamprey fails to grow rostromedially to form the medial nasal septum as in gnathostomes, but forms the upper lip instead. The gnathostome jaw may thus have arisen through a process of ontogenetic repatterning, in which a heterotopic shift of mesenchyme–epithelial relationships would have been involved. Further identification of shifts in tissue interaction and expression of regulatory genes are necessary to describe the evolution of the jaw fully from the standpoint of evolutionary developmental biology.
36
Lavin, P. A., and J. D. Mcphail. "The evolution of freshwater diversity in the threespine stickleback (Gasterosteus aculeatus): site-specific differentiation of trophic morphology." Canadian Journal of Zoology 63, no. 11 (November 1, 1985): 2632–38. http://dx.doi.org/10.1139/z85-393.
Abstract:
To assess interpopulation levels of morphological variability populations of Gasterosteus aculeatus were sampled from lakes within the upper Cowichan River system (Vancouver Island, British Columbia). Phenotypic divergence between populations is assumed to be a postglacial event. Nine characters were scored; eight were related to feeding and the ninth character was lateral plate number. All populations were the low plate morph; however, populations of Gasterosteus in lakes lacking piscivorous fish had significantly fewer lateral plates than populations in lakes with predatory fish species. Two distinct trophic "morphotypes" were identified, each one associated with a specific lake environment. Populations inhabiting benthic-dominated environments were found to possess reduced gill raker number and reduced gill raker length but increased upper jaw length relative to populations from limnetic environments. We propose that the interpopulation variability in trophic morphology is a response to trophic resource differences between lakes.
37
Pimentel, Thais, Henrique Hadad, Laís Kawamata Jesus, Luara Teixiera Colombo, Albertino Gomes Alcantara, Francisley Ávila Souza, and Idelmo Rangel Gárcia-Júnior. "Pathological fracture of the jaw due to osteomyelitis after a third molar extraction." ARCHIVES OF HEALTH INVESTIGATION 10, no. 4 (April 7, 2021): 637–40. http://dx.doi.org/10.21270/archi.v10i4.4942.
Abstract:
The osteomyelitis is an inflammatory process in bone tissue caused by an infection, commonly related to anaerobic pathogens, frequently Staphylococcus aureus and Streptococcus sp. Several causes have been related such as dentoalveolar infection, trauma, radiation and genetic condition, but it is not common after surgery for third molar extractions, especially in healthy patients. The symptoms of chronic osteomyelitis usually include signs and symptoms such as pain, edema, suppuration, areas of bone sequestration, and limited mouth opening. Among the complications associated with this condition, pathological fracture may occur due to local bone fragility. This paper aimed to report a rare case of pathological mandible fracture due to osteomyelitis after third molar extraction in a healthy male patient treated by a surgical procedure. The procedure consisted of decortication and resection of the sclerotic bone followed by reduce and fixation of mandibular fracture with one 2.4 reconstructive plate and one 2.0 plate with standard screws.
38
Raveh, J., M. Roux, and F. Sutter. "The lingual application of a reconstruction plate: A new method in bridging lower jaw defects." Journal of Oral and Maxillofacial Surgery 43, no. 9 (September 1985): 735–39. http://dx.doi.org/10.1016/0278-2391(85)90201-0.
39
Moriyama, Keita, Shun Watanabe, Midori Iida, and Noriyuki Sahara. "Plate-like permanent dental laminae of upper jaw dentition in adult gobiid fish, Sicyopterus japonicus." Cell and Tissue Research 340, no. 1 (March 9, 2010): 189–200. http://dx.doi.org/10.1007/s00441-010-0935-2.
40
Almeida, Gustavo Rodrigues, Bruna Danielli Costa Rocha, and Nancy Alfieri Nunes. "Osteosarcoma of jaw: Diagnosis and treatment challengers." Revista da Faculdade de Odontologia de Lins 30, no. 1-2 (December 28, 2020): 123–32. http://dx.doi.org/10.15600/2238-1236/fol.v30n1p123-132.
Abstract:
Introducion: Osteosarcoma is a primary malignant bone tumor most commonly found in long bones. However, in the oral cavity it mainly affects the ramus and angle of the mandible. Objetive: To present a case of osteolytic osteosarcoma of the mandible and discuss the difficulties of diagnosis and treatment. Case Report: A 22-year-old white female patient, non-smoker and non-drinker attended the stomatology service with complaints of increased volume on the right side of the mandible, exhibiting premolar and molar mobility in that area.Periapical and occlusal radiographs were performed and showed presence of radiolucent area and floating teeth, confirmed by a panoramic radiography showing involvement of the mandibular ramus. Two biopsies were performed in the region with inconclusive results for malignancy. The diagnostic hypothesis was osteosarcoma. A CT scan showed bone loss, floating teeth and involvement of areas adjacent to the tumor lesion and lymph nodes. The patient was referred to the oncology hospital and a frozen section biopsy was conclusive for osteosarcoma, with removal of the base and most of the right and left mandible ramus, followed by reconstruction with titanium plate. The tumor recurred and a new surgery, radiotherapy and chemotherapy were performed in an attempt to improve the clinical condition, with failure and death after four years of initial diagnosis and tumor mutation for rhabdomyosarcoma. Conclusion: Imaging and even histopathological outpatient exams were not able to promote the final diagnosis of osteosarcoma, impairing treatment and favoring recurrence and patient death. Key words: Osteosarcoma. Bone tumor. Diagnostic imaging.
41
Southerden, Peter, and Duncan M. Barnes. "Caudal mandibular fracture repair using three-dimensional printing, presurgical plate contouring and a preformed template to aid anatomical fracture reduction." Journal of Feline Medicine and Surgery Open Reports 4, no. 2 (July 2018): 205511691879887. http://dx.doi.org/10.1177/2055116918798875.
Abstract:
Case summary Two cats were presented with mandibular fractures following head trauma. Following a CT scan, both were diagnosed with fractures of the ramus. The CT scans were used to print three-dimensional (3D) models of the mandibular fractures, which were used to pre-contour stainless steel mini-plates. These were fixed to the models and the screw positions used to produce a stainless steel template. The template was used as a pattern during surgery to drill holes in the ramus so that the pre-contoured mini-plates could be fixed in the exact same position as they had been on the 3D model. The fractures healed in both cats achieving normal jaw function and occlusion. Relevance and novel information Conventional techniques used to treat caudal mandibular fractures in cats, such as maxillomandibular fixation and bignathic encircling and retaining device (BEARD), are associated with significant patient morbidity and postoperative complications. Internal rigid fixation is difficult because of small bone size, requirement for considerable plate contouring and difficulty in achieving accurate anatomical reduction of caudal mandibular fractures. These are the first reported cases of mini-plate fixation of caudal mandibular fractures in cats using 3D models, pre-contouring of bone plates and the use of a template to facilitate accurate plate positioning, which may provide an alternative technique suitable for fixing caudal mandibular fractures in cats.
42
Kitai, Noriyuki, Yoshitaka Iguchi, Mariko Takashima, Shumei Murakami, Sven Kreiborg, Takashi Kamiji, and Kenji Takada. "Craniofacial Morphology in an Unusual Case with Nasal Aplasia Studied by Roentgencephalometry and Three-Dimensional CT Scanning." Cleft Palate-Craniofacial Journal 41, no. 2 (March 2004): 208–13. http://dx.doi.org/10.1597/02-112.
Abstract:
Objective To examine the three-dimensional morphology of internal structures of the craniofacial region and present the orthodontic problems in an unusual case with nasal aplasia. Patient The patient was an 11.5-year-old boy with aplasia of the nose and nasal cavity with extremely constricted nasopharyngeal airway. He did not have mental or somatic retardation. The patient had dacryostenosis. The morphology of the craniofacial structures was characterized by absence of septal structures, including cribriform plate, perpendicular plate of ethmoid bone, vomer, and septal cartilage; bony hypotelorism; midface hypoplasia; short and retrognathic maxilla with Class III jaw relationship; average mandibular plane angle; high arched palate; severe anterior open bite with bilateral posterior crossbites; and dental anomalies (agenesis of four maxillary permanent teeth, microdontia, taurodontism, and short roots). Thus, the patient had characteristic dentofacial phenotype, which might be caused by a combination of the primary anomaly and the functional disturbances secondary to the nasal obstruction.
43
Chhabaria, Gaurav, Rajshekhar Halli, Sanjay Chandan, Samir Joshi, Sneha Setiya, and Anand Shah. "Evaluation of 2.0-mm Titanium Three-Dimensional Curved Angle Strut Plate in the Fixation of Mandibular Angle Fractures—A Prospective Clinical and Radiological Analysis." Craniomaxillofacial Trauma & Reconstruction 7, no. 2 (June 2014): 119–25. http://dx.doi.org/10.1055/s-0034-1371002.
Abstract:
The aim of the study was to evaluate the efficacy and complication rate with use of 2.0-mm titanium three-dimensional (3D) curved angle strut plate for mandibular angle fractures. Twenty cases requiring internal fixation of the mandibular angle by 2.0-mm titanium 3D curved angle strut plates were evaluated. Postoperative clinical and radiological analyses were done on 1st, 2nd, 4th, and 6th weeks, which included wound healing, transmitted movements, difficulty in function and occlusion, and neurosensory changes, if any. Reasonable level of success in terms of immediate jaw function was noted in all cases. Transient inferior alveolar nerve dysfunction was observed in three cases, which recovered gradually in 2 months, and surgical site infection was observed in two cases, which resolved with appropriate course of antibiotics and wound care. Fixation of mandibular angle fractures with a 2.0-mm titanium 3D curved angle strut plate is predictable, expeditious, and has less complication rate.
44
Sutter, F., and J. Raveh. "Titanium-coated hollow screw and reconstruction plate system for bridging of lower jaw defects: Biomechanical aspects." International Journal of Oral and Maxillofacial Surgery 17, no. 4 (August 1988): 267–74. http://dx.doi.org/10.1016/s0901-5027(88)80055-9.
45
Jung, Gyu Sik, Taek Kyun Kim, Jeong Woo Lee, Jung Dug Yang, Ho Yun Chung, Byung Chae Cho, and Kang Young Choi. "The Effect of a Condylar Repositioning Plate on Condylar Position and Relapse in Two-Jaw Surgery." Archives of Plastic Surgery 44, no. 1 (January 15, 2017): 19–25. http://dx.doi.org/10.5999/aps.2017.44.1.19.
46
Aquilina, Peter, William C. H. Parr, Uphar Chamoli, Stephen Wroe, and Philip Clausen. "A Biomechanical Comparison of Three 1.5-mm Plate and Screw Configurations and a Single 2.0-mm Plate for Internal Fixation of a Mandibular Condylar Fracture." Craniomaxillofacial Trauma & Reconstruction 7, no. 3 (September 2014): 218–23. http://dx.doi.org/10.1055/s-0034-1375172.
Abstract:
The most stable pattern of internal fixation for mandibular condyle fractures is an area of ongoing discussion. This study investigates the stability of three patterns of plate fixation using readily available, commercially pure titanium implants. Finite element models of a simulated mandibular condyle fracture were constructed. The completed models were heterogeneous in bone material properties, contained approximately 1.2 million elements and incorporated simulated jaw adducting musculature. Models were run assuming linear elasticity and isotropic material properties for bone. No human subjects were involved in this investigation. The stability of the simulated condylar fracture reduced with the different implant configurations, and the von Mises stresses of a 1.5-mm X-shaped plate, a 1.5-mm rectangular plate, and a 1.5-mm square plate (all Synthes (Synthes GmbH, Zuchwil, Switzerland) were compared. The 1.5-mm X plate was the most stable of the three 1.5-mm profile plate configurations examined and had comparable mechanical performance to a single 2.0-mm straight four-hole plate. This study does not support the use of rectangular or square plate patterns in the open reduction and internal fixation of mandibular condyle fractures. It does provide some support for the use of a 1.5-mm X plate to reduce condylar fractures in selected clinical cases.
47
Rivis, O. Yu, V. S. Melnyk, M. V. Rivis, and K. V. Zombor. "COMPARATIVE ANALYSIS OF MONOCORTICAL AND BICORTICAL METHODS OF INSTALLING MINI-IMPLANTS." Ukrainian Dental Almanac, no. 1 (March 23, 2021): 38–40. http://dx.doi.org/10.31718/2409-0255.1.2021.06.
Abstract:
The aim of the study. Carry out a comparative analysis of the support ability of human jaw bone tissue in monocortical and bicortical installation of a mini-implant of own design OMG.
Research methods. In order to study biomechanical characteristics of developed OMG mini-implant and bone tissue capacity during monocortical and bicortical installation, the finite element method (MSE) was used. The scheme and finite element 2-D model of bicortical installation of OMG mini-implant (length 8 mm, diameter 1.8 mm) provided full penetration through one layer of cortical bone equal to 1 mm, the entire cancellous bone and immersion in the second layer of cortical bone by 0, 5 mm. No implantation was immersed in the second cortical layer of bone during monocortical installation. A single force load of 1 N was applied in the horizontal direction parallel to the cortical plate of the bone.
Results of the study. One of the most important factors leading to the success of the use of a mini-implant is its stability in the process of orthodontic treatment. Quite a high level of failure in the monocortical installation of mini-screws has led to the search for better methods to ensure the stability of their use. This was a bicortical method of fixation, based on the placement of the minig screw in the thickness of the two cortical plates of the jaws. Area for such installation of mini-screws can be a site of a palate and alveolar sprouts at installation of miniimplants through all its thickness.
As shown by our data on the use of the finite element method under the force load of the biomechanical system "bone - mini-implant", the stress concentration zone is located in the area of the cortical bone of the jaw.
The results of the calculation of the maximum stresses (σmax, MPa) and the maximum possible displacements (umax, mm) of the mini-implant in the biomechanical system "bone - mini-implant" in monocortical installation were, respectively, 8.27 MPa and 0.300 * 10-8 mm and in bicortical installation 6.00 MPa and 0.201 * 10-8 mm.
The bicortical method of fixing the mini-implant in the jaw bones significantly increases the ability to resist deformation of this type of biomechanical system under force loads of the mini-implant.
In the bicortical method of mini-implant placement, the extreme values of equivalent according to Mises stresses in the upper part of the cortical bone of the jaw are reduced by 27%. This can be explained by a significant increase in the area of contact due to the two layers of the cortical bone of the jaw with the surface of the mini-implant.
Conclusion. The bicortical method of installing mini-implants is a more effective and reliable way to provide skeletal support during orthodontic treatment.
48
Kostionova-Ovod, Irina A. "X-ray tеsting of structures of keratinized gum and external cortical plate in the field of intact frontal teeth on the upper jaw." Aspirantskiy Vestnik Povolzhiya 20, no. 1-2 (December 10, 2020): 91–95. http://dx.doi.org/10.17816/2072-2354.2020.20.1.91-95.
Abstract:
Objectives. Сomparison of radiological parameters of the keratinized gum and the external cortical plate in the area of the front teeth on the upper jaw.
Material and methods. Сlinical examination of 50 patients aged 18 to 60 years was carried out in order to perform the work. These patients underwent 3D computed tomography which allowed to study the thickness of the keratinized gums in the dental area 1.1, 1.2, 1.3, 2.1, 2.2, 2.3.
Results. The results of the research revealed a similar trend at each level of measurement for the central and lateral incisors. The average values of the gum thickness decreased in the direction of the tooth crown. The thickness of the outer cortical plate had the lowest values in all studied teeth at the level of the alveolar crest apex and gradually increased in the apical direction. The thinnest external cortical plate and gums were revealed in canines.
Conclusion. The performed study showed that thickness of the gum is directly related to the thickness of the cortical plate. In percentage terms the gum thickness is 132 9.5% of the thickness of the cortical plate.
49
Mamedov, A. A., O. V. Dudnik, A. S. Chertikhina, D. S. Bille, and A. R. Beznosik. "Analysis of treatment methods for children with bilateral complete cleft of the lip and palate in mixed bite." Pediatric dentistry and dental profilaxis 20, no. 3 (October 10, 2020): 184–89. http://dx.doi.org/10.33925/1683-3031-2020-20-3-184-189.
Abstract:
Relevance. According to the World Health Organization, it was found that cleft lip and palate cases ranges from 0.6 to 1.6 cases per 1000 newborns. According to the severity of the lesion, bilateral cleft lip and palate takes the first place, however, it occurs much less common – 15-25%.Purpose – to analyze methods of treatment in children with bilateral cleft lip and palate during the period of the mixed dentition.Materials and methods. An analysis of 51 sources Russian and foreign articles for the period from 1951 to 2019 was carried out. The features of the development of occlusion in children with bilateral cleft lip and palate during the period of a changeable occlusion, as well as methods of treating this pathology, are considered.Results. It was found that the main anatomical features of the maxillofacial region in children with bilateral cleft lip and palate during the period of a changeable bite are -narrowing of the upper and lower jaws, the presence of soft tissue scars. The main methods of treatment for such children are reconstructive surgery, including the closure of a hard palate defect using a mucoperiosteal flap cut out in the lateral part of the hard palate, as well as orthodontic treatment methods, the main purpose of which is to expand and extend the dentition using single jaw removable plate apparatuses, fixed plate apparatuses.Conclusions. Taking everything into account, surgical reconstructive operations, as well as complex orthodontic treatment, the main purpose of which is to expand and extend the upper and lower jaws, are the integral methods of treating such children. Orthodontic treatment should be aimed at eliminating myofunctional disorders with the helpof orthodontic trainers and elastopositioners. Conducting a comprehensive surgical and orthodontic treatment can reduce the rehabilitation time of children with bilateral cleft lip and palate.
50
Ferreira, Deise Alves Kersten, Carolina Amador da Silva Calandrini, and Wagner Almeida Andrade. "Split crest: técnica de expansão imediata de rebordo para reabilitação de maxila atrófica. Um relato de caso clínico." Revista Odonto Ciência 31, no. 4 (August 3, 2017): 181. http://dx.doi.org/10.15448/1980-6523.2016.4.22153.
Abstract:
While the deploy planning, we come across morphological changes in the intervention area and the bone volume, which is extremely important for the treatment outcome. The objective of this study is to describe the technique “Split-Crest” through a clinical case in which success was obtained. Demonstrate indications and advantages of the technique in order to gain a significant increase in bone density to achieve an excellent aesthetic and functional result. Female patient, leucoderma, 46 years old, attended the Dental Clinic of Specialization in Implantodontics of ESAMAZ, with report of early teeth loss and poorly adapted prosthesis in the upper anterior region of the pre jaw. During the clinical evaluation was observed Edentulism in the anterior arch of the jaw. Total tomographic filming was done on the jaws, the initial diagnosis was a severe resorption present in the premaxilla requiring regenerative process to achieve bone gain. During surgery the patient had immediate installation of previous implants in the region of the elements 12 and 22 through the technique of “Slplit-Crest”, which consisted of two vertical cuts on the vestibular cortical portion and longitudinal osteotomy followed by the the shift vestibular cortical-spongy plate. Eight weeks later, the patient had clinically significant bone gain, proving the viability and success of the technique. A minimally invasive surgical procedure with well executed manipulation of tissue grafts and accelerates the clinical outcome, the working hours by the end of the treatment is smaller, has lower morbidity and lower operating costs.