Journal articles: 'Tungsten carbide burs'

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Lisiecka, Barbara. "The evaluation of wear of tungsten carbide dental bur." Production Engineering Archives 19, no. 19 (June 1, 2018): 6–9. http://dx.doi.org/10.30657/pea.2018.19.02.

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Abstract Due to its durability, tungsten carbide has long been used as a material to produce dental burs. WC– Co burs are designed for smooth, efficient cutting and extended life. Dental burs are available in different sizes and shapes, for example round burs, pear and cylinder-shaped, egg-shaped, as well as there are various tapered ones, which enable an individual selection of the drill for the right treatment. Carbides can be used for standard crowns and bridges, for extensive surgical procedures and they should minimize damage to the existing teeth. The design of WC–Co dental bur reduces a patient’s discomfort because of the operating time and the fact that its liquidity is preserved. The head of the bur (the cutting edge) delivers optimum concentricity and strength. The shank is made from stainless steel allowing a bur to be autoclaved multiple times without the risk of corrosion. The main purpose of this study was to evaluate the wear of a tungsten carbide dental bur. The results of stereoscopy microscope and SEM/EDS analysis are presented.

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Gorucu–Coskuner, Hande, Ezgi Atik, and Tulin Taner. "Tooth color change due to different etching and debonding procedures." Angle Orthodontist 88, no. 6 (August 3, 2018): 779–84. http://dx.doi.org/10.2319/122017-872.1.

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ABSTRACT Objectives: To compare the effects of different etching techniques, 12–, 24–bladed tungsten carbide burs, and polishing discs on tooth color changes during orthodontic treatment. Materials and Methods: 59 individuals (mean age: 15.20 ± 1.59 years) were divided into four groups: 37% phosphoric acid and adhesive primer was used in Groups I and II whereas self–etch primer was used in Groups III and IV for enamel preparation. After orthodontic treatment, residual adhesives were cleaned with 12–bladed tungsten carbide burs in Groups I and III, while 24–bladed tungsten carbide burs were used in Groups II and IV. All teeth were polished with medium and fine Sof–Lex XT discs (3M ESPE, St Paul, Minnesota). Color measurements were taken from upper incisors and canines at pretreatment (T0), after cleaning with tungsten carbide burs (T1) and polishing with discs (T2). Wilcoxon test was used for evaluation of L*, a*, b* changes and Kruskal–Wallis for intergroup comparison of color changes. Results: L*, a*, b* values, except a* at Groups I, II, IV, and b* at Group III, changed significantly (P < .05). Groups III and IV showed significantly different color alterations from T0 to T1 (P < .05). After polishing, tooth color alterations were not significantly different among the groups. Conclusions: In self–etch bonding groups, a 12–bladed tungsten carbide bur caused less color change than the 24–bladed tungsten carbide bur. Orthodontic treatment resulted with visible and clinically unacceptable tooth color alterations regardless of the enamel preparation and clean–up techniques. Polishing reduced the effect of tungsten carbide burs, but did not affect the total influence of orthodontic treatment on the tooth color.

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Petrovic, Renata. "SEM investigation of polishing composite restorations." Serbian Dental Journal 51, no. 1 (2004): 19–23. http://dx.doi.org/10.2298/sgs0401019p.

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Proper finishing and polishing of composite restaurations are procedures that enhance the quality of restorations and reduce plaque accumulation. The purpose of this study was to evaluate with SEM analysis the effect of different polishing methods and instruments of composite surface after polishing. We used different instruments for finishing and polishing: carbide tungsten burs, diamond fissural burs, steel fissural burs, Lo-Flex Pop On discs, Sof-Lex Pop On discs, Hawe rubber cups, gray rubber cups, green rubber cups, polishing strips, polishing pastes. The results we obtained showed that the most efficient polishing of composite restorations was achieved after treatment with Sof-Lex discs, rubber cups and pastes. Treatment with carbide tungsten burs, was the least effective, producing the lowest smoothness of composite surface.

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Noviyanti Putri, Aditya Kartika, Thalca Hamid, and Ari Triwardhani. "Comparison of Tungsten Carbide and Arkansas Stone For Adhesive Removal On Enamel Surface After Debonding Procedure." Indonesian Journal of Dental Medicine 1, no. 1 (March 31, 2018): 59. http://dx.doi.org/10.20473/ijdm.v1i1.2018.59-65.

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Background: Debonding aims to remove orthodontic appliances from the patient's teeth and cleanse all residual adhesive material on the surface of the tooth to restore surface conditions such as before orthodontic treatment. Damage may occur after debonding process. Removal of the remaining adhesive material has a major effect on the enamel surface conditions, the researcher wants to know the effect of cleaning adhesive material using Tungsten carbide 12 flute burs, Arkansas stone bur on the enamel surface Purpose: To determine the effect of cleaning the remaining adhesive material using Tungsten carbide 12 flute burs and Arkansas stone bur Against the Surface of the Enamel. Method: This study was experimental laboratory (in vitro study) with 4 groups division, first control group was tooth before bracket was installed, group 2 was done debonding without cleaning of residual adhesive, group 3 was done adhesive cleansing with Arkansas stone and group 4 was done adhesive cleaning with tungsten carbide 12-flutted Result: Showing that the use of 12-flutted tungsten carbide was able to clean enamel surfaces with the most delicate results and did not cause cracks or cracks on enamel surface Conclusions: The best method to clean the remaining adhesive is using 12-flutted tungsten carbide bur using contra angle high speed and with adequate water flow and sprays to prevent increasing of temperature that damage dental pup.

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Dammaschke, T., T. N. Rodenberg, E. Schäfer, and K. H. R. Ott. "Efficiency of the Polymer Bur SmartPrep Compared with Conventional Tungsten Carbide Bud Bur in Dentin Caries Excavation." Operative Dentistry 31, no. 2 (February 1, 2006): 256–60. http://dx.doi.org/10.2341/05-24.

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Bodrumlu, Emre, İlker Keskiner, Mahmut Sumer, and Nazife Telcioglu. "Temperature variation on root surface with three root-end cavity preparation techniques." Srpski arhiv za celokupno lekarstvo 141, no. 9-10 (2013): 597–601. http://dx.doi.org/10.2298/sarh1310597b.

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Introduction. Thermal changes can occur on the external root surface when root-end cavity preparation is performed, which may damage periodontal ligament cells and alveolar bone. Objective. The purpose of this study was to evaluate the temperature changes during preparation of the root-end cavities at 1 and 3 mm to the sectioned apical root surfaces when either tungsten carbide round bur, diamond round bur or ultrasonic diamond tip was used. Methods. Root-end resection was performed at 90? to the long axis of the root, 3 mm from the apex. Specimens were randomly divided into three groups of 12 teeth each for three different root-end cavity preparation techniques to be used, i.e. tungsten carbide bur, diamond bur and ultrasonic diamond retro tip. Thermocouples were used to measure temperature changes at 1 mm (T1) and 3 mm (T2) to the cutting plane during the preparations. Results. For T1, the lowest and the highest mean temperature increases of 3.53?C and 4.34?C were recorded for the carbide and diamond burs, respectively. For T2, the lowest and the highest mean temperature increases of 2.62?C and 4.39?C where recorded for the carbide and diamond burs, respectively. The mean temperatures with the ultrasonic tip were 3.68 and 3.04 ?C at T1 and T2 region, respectively. For root-end preparation, the ultrasonic preparation technique took the shortest preparation time (10.25 sec) and the diamond bur took the longest time (28.17 sec). Conclusion. Ultrasonic retro tips and burs caused temperature to rise from 2.62? to 4.39?C, and these rises were within safety levels.

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Leão Filho, Jorge César Borges, Ana Karla Souza Braz, Renato Evangelista de Araujo, Orlando Motohiro Tanaka, and Matheus Melo Pithon. "Enamel Quality after Debonding: Evaluation by Optical Coherence Tomography." Brazilian Dental Journal 26, no. 4 (August 2015): 384–89. http://dx.doi.org/10.1590/0103-6440201300406.

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<p>The aims of this study were to evaluate quantitatively the enamel fractures, adhesive remnants and bracket fragments on enamel after debonding of metal and ceramic brackets, and to quantify the layer of adhesive remnants in depth after two different cleanup procedures. Metal and ceramic brackets were bonded on 120 human incisors and then debonded using two different techniques with Side Cutter (SC) and Anterior Bracket Removal plier (ABR). After this, a high-speed tungsten carbide finishing bur or a low-speed tungsten carbide finishing bur was used. The debonded samples were submitted to enamel assessment with optical coherence tomography (OCT). In sequence, two different methods of removing the remaining adhesive (tungsten carbide burs at high and low speed) were performed and at the end of these procedures, the remaining adhesive layer was measured with OCT. The results demonstrated that enamel fractures were observed only in the samples bonded with ceramic brackets, and the type of pliers did not influence the incidence and extent of enamel damage. Moreover, the type of debonding technique (with side-cutting pliers or anterior bracket removal pliers) and the type of bracket did not influence the amount of adhesive remaining after debonding. The burs at low speed removed the remaining adhesive more effectively during cleanup procedures.</p>

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Ahmed, Ayman A., and C. Peter Owen. "A base-line study of the wear of burs used for chairside milling of ceramic crowns of different hardness: effect on internal fit and surface roughness." South African Dental Journal 75, no. 10 (November 1, 2020): 534–40. http://dx.doi.org/10.17159/2519-0105/2020/v75no10a1.

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INTRODUCTION: Wear of milling burs may affect the internal fit and surface roughness of the milled crown. AIM: To assess the wear of diamond and tungsten carbide (TC) burs from milling ceramic materials and the effect on internal fit and surface roughness. METHODS: Thirty crowns of each of the two materials were milled from the same standard preparation. Diamond burs were used for a feldspathic ceramic and TC burs for zirconia. Before and after the 10th, 20th and 30th milling, diamond particle loss was counted and cutting blade changes of the TC burs measured. Internal fit was measured using a silicone replica technique and surface roughness by 3D laser microscope. RESULTS: An average 26% loss of diamond particles occurred after 30 crowns, resulting in a 6% decrease in internal luting space and a 21% decrease in surface roughness. Wear of the TC burs resulted in a 13% decrease in the luting space, and a 16% increase in surface roughness. CONCLUSION: The wear of milling burs reduces the luting space, and the milling parameters must be adjusted to compensate for this. Surface roughness is affected by bur type: with diamond burs it decreased, and increased with TC burs.

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Ahmed, Waqar, Htet Sein, Mark Jackson, and Riccardo Polini. "Chemical vapour deposition of diamond films onto tungsten carbide dental burs." Tribology International 37, no. 11-12 (November 2004): 957–64. http://dx.doi.org/10.1016/j.triboint.2004.07.013.

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Patterson, C. J., A. C. McLundie, and A. M. Mackay. "The effect of ultrasonic cleansing and autoclaving on tungsten carbide burs." British Dental Journal 164, no. 4 (February 1988): 113–15. http://dx.doi.org/10.1038/sj.bdj.4806368.

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Oliver, R. G., and J. Griffiths. "Different Techniques of Residual Composite Removal following Debonding—Time Taken and Surface Enamel Appearance." British Journal of Orthodontics 19, no. 2 (May 1992): 131–37. http://dx.doi.org/10.1179/bjo.19.2.131.

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Four different methods of in vitro residual composite removal following debonding performed by two different operators (an orthodontist and a hygienist) were assessed for enamel surface damage (using scanning electron microscopy) and the time involved. There was no difference in the quality of enamel surface appearance between the two operators, regardless of the method used for composite removal. There was a statistically significant difference (P < 0·05) for the time taken for composite removal between the two operators using a tungsten carbide bur method only. It is suggested that an expanded duties auxiliary with the practical skills of the hygienist would be able to remove residual composite debris and produce a satisfactory polished enamel surface using tungsten carbide burs and aluminium oxide polishing discs, thus becoming a safe and cost-effective member of the orthodontic team.

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Sheriteh, Zahra, Tasnim Hassan, Martyn Sherriff, Martin Cobourne, and Peter Riley. "Decontamination of viableStreptococcus mutansfrom orthodontic tungsten carbide debonding burs. Anin vitromicrobiological study." Journal of Orthodontics 37, no. 3 (September 2010): 181–87. http://dx.doi.org/10.1179/14653121043083.

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Stokes, Alastair N., and Brian G. Tidmarsh. "A comparison of diamond and tungsten carbide burs for preparing endodontic access cavities through crowns." Journal of Endodontics 14, no. 11 (November 1988): 550–53. http://dx.doi.org/10.1016/s0099-2399(88)80089-x.

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Maass, F., Y. Aguilera, and J. Avaria. "Laboratory analysis of dental sections made with commercial tungsten carbide burs coated with HFCVD diamond." Journal of Physics: Conference Series 134 (November 1, 2008): 012031. http://dx.doi.org/10.1088/1742-6596/134/1/012031.

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HOTTA, Yasuhiro, Takashi MIYAZAKI, Toshihisa FUJIWARA, Shoko TOMITA, Akiyoshi SHINYA, Yasuhisa SUGAI, and Hideo OGURA. "Durability of Tungsten Carbide Burs for the Fabrication of Titanium Crowns using Dental CAD/CAM." Dental Materials Journal 23, no. 2 (2004): 190–96. http://dx.doi.org/10.4012/dmj.23.190.

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Sheriteh, Zahra, Tasnim Hassan, Martyn Sherriff, and Martin Cobourne. "Decontamination procedures for tungsten carbide debonding burs: a cross‐sectional survey of hospital‐based orthodontic departments." Journal of Orthodontics 37, no. 3 (September 2010): 174–80. http://dx.doi.org/10.1179/14653121043074.

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Janiszewska-Olszowska, Joanna, Robert Tomkowski, Katarzyna Tandecka, Piotr Stepien, Tomasz Szatkiewicz, Katarzyna Sporniak-Tutak, and Katarzyna Grocholewicz. "Effect of orthodontic debonding and residual adhesive removal on 3D enamel microroughness." PeerJ 4 (October 11, 2016): e2558. http://dx.doi.org/10.7717/peerj.2558.

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BackgroundTermination of fixed orthodontic treatment is associated with bracket debonding and residual adhesive removal. These procedures increase enamel roughness to a degree that should depend on the tool used. Enamel roughening may be associated with bacterial retention and staining. However, a very limited data exists on the alteration of 3D enamel roughness resulting from the use of different tools for orthodontic clean-up.Aims1. To perform a precise assessment of 3D enamel surface roughness resulting from residual adhesive removal following orthodontic debonding molar tubes.2. To compare enamel surfaces resulting from the use of tungsten carbide bur, a one-step polisher and finisher and Adhesive Residue Remover.Material and MethodsBuccal surfaces of forty-five extracted human third molars were analysed using a confocal laser microscope at the magnification of 1080× and 3D roughness parameters were calculated. After 20 s etching, molar tubes were bonded, the teeth were stored in 0.9% saline solution for 24 hours and debonded. Residual adhesive was removed using in fifteen specimen each: a twelve-fluted tungsten carbide bur, a one-step finisher and polisher and Adhesive Residue Remover. Then, surface roughness analysis was repeated. Data normality was assessed using Shapiro–Wilk test. Analysis of variance (ANOVA) was used to compare between variables of normal distribution and for the latter—Kruskal-Wallis test.ResultsSa (arithmetical mean height) was significantly different between the groups (p= 0, 01326); the smoothest and most repeatable surfaces were achieved using Adhesive Residue Remover. Similarly, Sq (root mean square height of the scale-limited surface) had the lowest and most homogenous values for Adhesive Residue Remover (p= 0, 01108). Sz (maximum height of the scale-limited surface) was statistically different between the groups (p= 0, 0327), however no statistically significant differences were found concerning Ssk (skewness of the scale-limited surface).DiscussionConfocal laser microscopy allowed 3D surface analysis of enamel surface, avoiding the limitations of contact profilometry. Tungsten carbide burs are the most popular adhesive removing tools, however, the results of the present study indicate, that a one step polisher and finisher as well as Adhesive Residue Remover are less detrimental to the enamel. This is in agreement with a recent study based on direct 3D scanning enamel surface. It proved, that a one-step finisher and polisher as well as Adhesive Residue Remover are characterized by a similar effectiveness in removing residual remnants as tungsten carbide bur, but they remove significantly less enamel.ConclusionOrthodontic debonding and removal of adhesive remnants increases enamel roughness. The smoothest surfaces were achieved using Adhesive Residue Remover, and the roughest using tungsten carbide bur.

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Heide, S., and H. S. Koppang. "Mineralized deposits in pulps of incompletely developed permanent monkey incisors after pulpotomy with tungsten carbide fissure burs." Dental Traumatology 10, no. 3 (June 1994): 134–40. http://dx.doi.org/10.1111/j.1600-9657.1994.tb00538.x.

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Beltrami, Riccardo, Matteo Ceci, Gabriele De Pani, Lodovico Vialba, Ricaldone Federico, Claudio Poggio, and Marco Colombo. "Effect of different surface finishing/polishing procedures on color stability of esthetic restorative materials: A spectrophotometric evaluation." European Journal of Dentistry 12, no. 01 (January 2018): 049–56. http://dx.doi.org/10.4103/ejd.ejd_185_17.

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ABSTRACT Objective: To evaluate the color stability of different esthetic restorative materials after surface finishing/polishing with different procedures. Materials and Methods: All materials were polymerized into silicone rubber rings to obtain specimens identical in size. Samples were randomly assigned into four groups (10 specimens of each composite for each group), and they were finished with different procedures: Control group (Group 1), three or two polishers interspersed with diamond grit (Groups 3 and 2, respectively), and one tungsten carbide bur + one polisher interspersed with diamond grit (Group 4). After staining process in coffee, a colorimetric evaluation according to the CIE L*a*b* system was performed by a blind trained operator at 7, 14, 21, and 28 days. Shapiro–Wilk test and Kruskal–Wallis analysis of variance were applied to assess significant differences among restorative materials. Means of the different polishing/finishing groups were compared with Scheffe’s multiple comparison test at the 0.05 level of significance. Results: In control group, significant lower discolorations were recorded for Essentia, Admira Fusion, and Estelite. After finishing, Filtek Supreme XTE and Ceram.X Universal showed a significantly lower degree of staining. The finishing technique used for Group 4 produced higher color changes. Conclusions: Tungsten carbide burs produced the higher color variations; after finishing, the nanofilled composites showed lower discoloration than nanohybrid ones, and the time of exposure to the staining agent and the polishing/finishing technique influenced the color change.

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Sadrhaghighi, Amir Hooman, Amir Mohammadi, Tannaz Abdollahzadeh Baghaei, and Hamed Alipour. "Tooth color alteration after debonding in orthodontic patients with adhesive removal using composite bur or tungsten carbide bur: a single center, randomized controlled clinical trial." Brazilian Dental Science 23, no. 4 (September 30, 2020): 8p. http://dx.doi.org/10.14295/bds.2020.v23i4.2140.

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Introduction: The objective of this study was to determine whether recently developed fiber reinforced composite burs provided better results by comparing tooth discoloration after debonding of orthodontic brackets.Methods: A split-mouth, randomized controlled trial was carried out in one orthodontic office; including 23 patients with intact, vital and caries-free four upper incisors aged 12 to 30 years who completed their fixed orthodontic treatment. For each patient, upper central and lateral incisors on each side of the mouth were randomly selected to remove the adhesive with either a tungsten carbide bur (TC) (n = 46) or a fiber-reinforced composite bur (FC) (n=46). Color evaluation of each tooth was conducted at two time points: immediately after finishing and polishing procedure and two months afterwards. The primary outcome would be the amount of color change in each group during the post treatment phase. The participants, the person assessing the color change and the statistician were blinded to TC group assignment. Color changes in each group were analyzed with the Paired T-test. The color change corresponding to the resin removal method was also statistically analyzed with the Independent T-test at ?=0.05 as the level of significance.Results: 86 teeth, 43 in each group, were analyzed. The ?E value was 3.713±1.161, for teeth finished TC and 2.114±0.514 for teeth finished with FC (p<0.01).Conclusion: adhesive removal with FC bur results in a more color-resistant tooth surface in comparison with tungsten carbide bur.

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Hedayat, Assem, Nicole Nagy, Garnet Packota, Judy Monteith, Darcy Allen, Tomasz Wysokinski, and Ning Zhu. "Synchrotron-radiation-based X-ray micro-computed tomography reveals dental bur debris under dental composite restorations." Journal of Synchrotron Radiation 23, no. 3 (March 23, 2016): 777–82. http://dx.doi.org/10.1107/s1600577516002198.

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Dental burs are used extensively in dentistry to mechanically prepare tooth structures for restorations (fillings), yet little has been reported on the bur debris left behind in the teeth, and whether it poses potential health risks to patients. Here it is aimed to image dental bur debris under dental fillings, and allude to the potential health hazards that can be caused by this debris when left in direct contact with the biological surroundings, specifically when the debris is made of a non-biocompatible material. Non-destructive micro-computed tomography using the BioMedical Imaging & Therapy facility 05ID-2 beamline at the Canadian Light Source was pursued at 50 keV and at a pixel size of 4 µm to image dental bur fragments under a composite resin dental filling. The bur's cutting edges that produced the fragment were also chemically analyzed. The technique revealed dental bur fragments of different sizes in different locations on the floor of the prepared surface of the teeth and under the filling, which places them in direct contact with the dentinal tubules and the dentinal fluid circulating within them. Dispersive X-ray spectroscopy elemental analysis of the dental bur edges revealed that the fragments are made of tungsten carbide–cobalt, which is bio-incompatible.

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Andrian, Sorin, Gianina Iovan, Galina Pancu, Claudiu Topoliceanu, Andrei Georgescu, Simona Stoleriu, Ionut Taraboanta, and Irina Nica. "Study Regarding the Surface State of Composite Resins After Finishing and Polishing Using Different Systems." Materiale Plastice 54, no. 4 (December 30, 2017): 689–93. http://dx.doi.org/10.37358/mp.17.4.4926.

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The aim of this study was to evaluate the influence of different finishing and polishing systems and of composite resins structure on surface state of the restoration. Cylindrical samples from two different composite resins (Filtek Z 550 and Filtek Z 250, 3M ESPE) were obtained. In group 1 the samples were not finished and polished. In groups 2-4 the samples were submitted to finishing procedure using two tungsten carbide burs, then polished using three different polishing systems: three steps diamond abrasive polishers (Kenda CGI, Lichtenstein) - group 2, one step silicon carbide abrasive particles brush (Occlubrush, KerrHawe SA, Switzerland) - group 3 and two steps Sof-Lex spiral wheels (3M ESPE) - group 4. Half of the samples in each group were subjected to surface microstructure evaluation using a scanning electron mycroscope. The other half of the samples was subjected to surface state assessment using profilometery. All the investigated finishing and polishing systems leaded to increased surface roughness when compared to the roughness of composite resins placed in direct contact to celluloid clear matrix. The surface roughness of both microfilled-hybrid and nanofilled-hybrid composite resins finished and polished with different systems were influenced mostly by the polishing system and less by the composite resin structure.

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Price, R. B., and E. J. Sutow. "Micrographic and profilometric evaluation of the finish produced by diamond and tungsten carbide finishing burs on enamel and dentin." Journal of Prosthetic Dentistry 60, no. 3 (September 1988): 311–16. http://dx.doi.org/10.1016/0022-3913(88)90275-2.

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Cardoso, Larissa Adrian Meira, Heloísa Cristina Valdrighi, Mario Vedovello Filho, and Américo Bortolazzo Correr. "Effect of adhesive remnant removal on enamel topography after bracket debonding." Dental Press Journal of Orthodontics 19, no. 6 (December 2014): 105–12. http://dx.doi.org/10.1590/2176-9451.19.6.105-112.oar.

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INTRODUCTION: At orthodontic treatment completion, knowledge about the effects of adhesive remnant removal on enamel is paramount.OBJECTIVE: This study aimed at assessing the effect of different adhesive remnant removal methods on enamel topography (ESI) and surface roughness (Ra) after bracket debonding and polishing.METHODS: A total of 50 human premolars were selected and divided into five groups according to the method used for adhesive remnant removal: high speed tungsten carbide bur (TCB), Sof-Lex discs (SL), adhesive removing plier (PL), ultrasound (US) and Fiberglass burs (FB). Metal brackets were bonded with Transbond XT, stored at 37oC for 24 hours before debonding with adhesive removing plier. Subsequently, removal methods were carried out followed by polishing with pumice paste. Qualitative and quantitative analyses were conducted with pre-bonding, post-debonding and post-polishing analyses. Results were submitted to statistical analysis with F test (ANOVA) and Tukey's (Ra) as well as with Kruskal-Wallis and Bonferroni tests (ESI) (P < 0.05).RESULTS: US Ra and ESI were significantly greater than TCB, SL, PL and FB. Polishing minimized Ra and ESI in the SL and FB groups.CONCLUSION: Adhesive remnant removal with SL and FB associated with polishing are recommended due to causing little damage to the enamel.

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Lo Giudice, Roberto, Francesco Puleio, David Rizzo, Angela Alibrandi, Giorgio Lo Giudice, Antonio Centofanti, Luca Fiorillo, Debora Di Mauro, and Fabiana Nicita. "Comparative Investigation of Cutting Devices on Bone Blocks: An SEM Morphological Analysis." Applied Sciences 9, no. 2 (January 21, 2019): 351. http://dx.doi.org/10.3390/app9020351.

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Background: Bone regeneration is a reliable technique when the bone volume is insufficient to provide a functional and aesthetic outcome in surgery and implantoprosthesis procedures. When bone blocks are used but do not match the shape of the defect, the block must be adapted. The aim of our research was to evaluate, by Scanning Electron Microscopy (SEM) morphological observation, how different cutting devices modify the bone surface. Method: Four equine bone blocks were divided into 15 cubic shape samples with ultrasonic and sonic tips, as well as diamond, tungsten carbide, and Lindemann burs. The uncut surface of the obtained bone block was used as a control. Two observers independently analyzed the SEM observation recording, including cut precision, depth of incision, thermal damages, and presence of bone debris. For each group, sharpness, depth, carbonization, and bone debris were expressed as mean values. Results: The osteotomy performed with an ultrasonic tip shows the best results, preserving the bone morphology in both quantitative and qualitative analyses. The bone surface appeared sufficiently clean from debris and showed a reduced presence of carbonization. Conclusion: The shaping of the bone block as in vivo osteotomy respects the bone morphology and allows it to achieve the relevant biological and clinical outcome.

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T Danny, Davis, Sugareddy, and Srinivas Reddy. "Comparison of the enamel surface roughness before bonding and after debonding by diamond, tungsten carbide and fiber reinforced composite burs under AFM an in-vitro study." Indian Journal of Orthodontics and Dentofacial Research 4, no. 3 (October 15, 2018): 151–55. http://dx.doi.org/10.18231/2455-6785.2018.0029.

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Chaudhari, Payal Sandeep, Manoj Ghanshyam Chandak, Kajol Naresh Relan, Pooja Ghanshyam Chandak, Chanchal Harikishor Rathi, Madhulika Shyamsundar Chandak, and Abhilasha Dass. "Lasers in Diagnosis, Interception and Management of White Spot Lesions and Dental Caries - A Review." Journal of Evolution of Medical and Dental Sciences 10, no. 9 (March 1, 2021): 624–31. http://dx.doi.org/10.14260/jemds/2021/134.

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Despite huge developments in oral health, dental caries still remains a community health issue globally. Dental caries is prevalent worldwide amongst adults and school children; nearly 100 % of the population is affected in most of the countries. Caries harms the outer dental structures, eventually reaching the dental pulp, making the teeth undermined and ultimately compromising functional abilities. It is the major reason for loss of tooth. For the management of carious lesions, the tissues which are decayed should be removed and replaced by dental restorations. Increased potential for causing dental anxiety and uneasiness in many patients has been reported with the usage of routine caries removal systems such as diamond and tungsten carbide rotating burs. Moreover, with the use of high and low rotating speed drills, which is used for complete dentin removal, over excavation of caries (when the deeper dentin layers are involved) may happen eventually leading to increased risk of exposing and damaging the pulp irreversibly. These disadvantages have led to exploration of new alternatives such as stepwise, minimal or no dentinal caries removal procedures that illustrate clinical benefit over comprehensive caries removal in the treatment of dentinal caries. Laser technology has reformed the management of dental caries. Laser has been found to be the latest, most recent, conservative, less traumatic and minimally invasive caries removal procedure. The energy of laser is absorbed which is then transformed to heat, leading to microstructural and chemical alterations in the surface of enamel which is irradiated thereby improving enamel acid resistance. Laser also helps to maintain a dry surrounding that improves the dentist’s vision of the working field thereby resulting in an improved outcome. KEY WORDS Lasers, White Spot Lesions, Dental Caries, Laser Fluorescence, Orthodontic Therapy, Carbon-Dioxide Laser

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Timata, Manit, and Charnnarong Saikaew. "Influence of Spindle Speed on Exit Burr Height in Drilling Forging Brass." Advanced Materials Research 1105 (May 2015): 159–63. http://dx.doi.org/10.4028/www.scientific.net/amr.1105.159.

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In the drilling of forging materials, exit burrs are produced on the end of hole and had some undesirable characters leading to assembly quality problem. Deburring is one of the practical techniques used to solve this problem. However, this technique is a time consuming and causes high operation cost. Hence this work presented an experimental study in drilling forging brass using special tungsten carbide drilling tools. The exit burr size was evaluated at various spindle speeds and lot size. Effect of spindle speed on exit burr height was investigated using analysis of variance (ANOVA). The results of ANOVA indicated that the spindle speed of 415 rpm gave lowest exit burr height and produced higher quantity and quality of products.

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Ali, Mohammad Yeakub, Mohd Aliff Omar, Khairul Irman Othman, and Wayne N. P. Hung. "Prediction of Burr Formation in Fabricating MEMS Components by Micro End Milling." Advanced Materials Research 74 (June 2009): 247–50. http://dx.doi.org/10.4028/www.scientific.net/amr.74.247.

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This paper discusses burr formation in micromilling of AISI 304 stainless steel. Chip load, cutting speed and the application of coolant were chosen as the milling parameters. Experiments were conducted using 500 µm diameter tungsten carbide end milling tool. Milling parameters and measured burr height values were analyzed and statistical models were developed for the estimation of burr height. The models showed that the chip load and cutting speed both have direct and interactive contribution to burr formation. When micromachining without coolant, the burr height increases about 40% compared to that of machining with coolant. The optimized values of chip load and cutting speed were found to be 1 µm/tooth and 78 mms-1 respectively. The predicted burr heights were 5-7% larger than that of measured values.

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Timata, Manit, and Charnnarong Saikaew. "Influences of Spindle Speed and Feed Rate on Exit Burr Height and Workpiece Diameter in Drilling Forging Brass." Solid State Phenomena 279 (August 2018): 67–71. http://dx.doi.org/10.4028/www.scientific.net/ssp.279.67.

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Exit burrs are formed on the end of hole and have some undesirable characters leading to assembly quality problem. Deburring is one of the practical procedures used to solve this problem. Nevertheless, this step is a time consuming and causes high operation cost. This work studied the experimental investigations in drilling forging brass using a special tungsten carbide drilling tools. The exit burr height and workpiece diameter were measured at various spindle speeds and feed rates based on 2k plus center point experimental design and investigated by analysis of variance (ANOVA). The results of ANOVA indicated that spindle speed and feed rate on exit burr height and workpiece diameter were statistically significant at the level of significance of 0.05.

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Uysal, Alper, Eshreb Dzhemilov, and Ruslan Dzhemalyadinov. "Effect of MWCNT on surface roughness and burr height in MQL milling of AISI 430 ferritic stainless steel." Ukrainian journal of mechanical engineering and materials science 6, no. 1 (2020): 8–13. http://dx.doi.org/10.23939/ujmems2020.01.008.

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Stainless steel materials have been used in many fields such as automotive, aviation, medical industries, etc. In addition, these materials are classified as difficult-to-cut materials due to low thermal conductivity and work-hardening tendency. Therefore, studies on machining of these materials have been performed in order to understand the basic of the process. In this study, surface roughness and burr height were investigated in MQL (Minimum Quantity Lubrication) milling of AISI 430 ferritic stainless steel. In MQL milling, commercial vegetable cutting fluid and MWCNT (Multi Walled Carbon Nanotube) reinforced vegetable cutting fluid were used. The milling experiments were also conducted under dry condition. In the experiments, uncoated WC (Tungsten Carbide) and TiN (Titanium Nitride) coated WC cutting inserts were used. Based on the experimental results, MQL method reduced the surface roughness and burr heights and better surfaces were obtained by using nanofluids in MQL method.

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Макаров, Алексей, Aleksey Makarov, Александр Кудряшов, Aleksandr Kudryashov, Александр Владимиров, Aleksandr Vladimirov, Анна Титова, and Anna Titova. "USE OF SURFACING MATERIALS MODIFIED WITH REFRACTORY COMPONENTS FOR REDUCTION OF ROLLERS IN BLANK CONTINUOUS CASTING MACHINES." Bulletin of Bryansk state technical university 2019, no. 8 (September 9, 2019): 41–48. http://dx.doi.org/10.30987/article_5d6cbe428ab026.77335497.

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At metallurgical enterprises the worn out rollers of BCCM are reduced by means of a surfacing technology. In most cases the rollers of BCCM are made of heat-resistant steel of 20H13 and 25H1M1F grades and others and their reduction is carried out by surfacing with the use of powder wire, for instance PP-Np-25H5FMS. Life increase of the reduced rollers of BCCM twice as many and more is an urgent problem requiring the use of more wear-resistant materials. The paper reports the results of X-ray structural, phase, structural, tribological, thermocyclic investigations directed to the analysis of the possibility in use of ASM 4603-SA filler modified with 3% of refractory components of tungsten carbide (TC) and 0.2% hexagonal boron nitride (BN) for roller reduction of blank continuous casting machines. It is defined that ASM 4603-SA powder wire application with the refractory component addition is promising for roller surfacing reduction in BCCM. As a result of mentioned material electro arc surfacing on the roller surface of BCCM there is formed a wear-resistant layer with hardness up to 57 HRC resistant to a crack formation and burn back grid as a result of cyclic hightemperature impacts characterized with the decreased friction coefficient in comparison with the layer surfaced with the basic material.

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"SmartPrep versus tungsten carbide bud burs." Dental Abstracts 52, no. 1 (January 2007): 41–42. http://dx.doi.org/10.1016/s0011-8486(07)80032-x.

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Krishna Sravan, Mangipudi, Sumeet Sharma, A. Jyothi, Rizwanulla Rizwanulla, and Chandramouli Chandramouli. "EFFECT OF VARIOUS STERILIZATION AND DISINFECTION PROTOCOLS OF TOOTH PREPARATION BURS ON THEIR CUTTING EFFICIENCY AND THEIR RELATION TO THE SURFACE ROUGHNESS OF TOOTH PREPARATION – AN INVITRO STUDY." INTERNATIONAL JOURNAL OF SCIENTIFIC RESEARCH, August 1, 2021, 56–59. http://dx.doi.org/10.36106/ijsr/5604885.

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AIM: This study aims to evaluate the effect of sterilization and disinfection of rotary diamond burs on their cutting efciency and their relation to their surface roughness. A total of 12 (n=12) burs and acrylic typodont teeth of (n=36) were taken MATERIALS AND METHODS: which consists of Diamond TF-13 (MANI) (n=6) and Tungsten carbide bur 169L bur (Prima Dental, Prima Classic) (n=6). These burs were divided into 6 groups. Each group consists of Sub Groups A & B. Sub Group A in each Group Contains Diamond TF-13 (n=1) and Sub Group B in each group contains Tungsten carbide bur 169L bur (n=1). Each single Group is subjected to different methods of sterilization and disinfection with Autoclave, Hot air oven, Ultrasonic, Glass bead, Chemical Disinfection (KORSOLEX) after the tooth preparation. Samples of crown preparation were prepared by placing the mounted tooth on a Modied Milling Machine. After each use, these diamonds and burs were sterilized for 3 cycles of tooth preparation simultaneously and the tooth were evaluated for the surface roughness with a surface prolometer and the resultant values were noted and statistically analyzed. The burs were evaluated for the surface quality under Stereomicroscope and scores were given from 0 to 5 according to the grits and wear present on the surface of the burs. Diamond rotary burs CLINICAL SIGNIFICANCE: should be sterilized and disinfected as it has become a mandatory protocol for the dental professionals to prevent cross-contamination and cross infection between the dentist and dental personnel. However, different sterilization and disinfection methods can have undesirable effects on the ability of the burs to effectively reduce the tooth structure. Irrespective of the type of bur and sterilization process used, the cutting efciency decreases after multiple usage of the burs.

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Maass, F., and E. Rojas. "Study of Dental Cutting with Tungsten Carbide Burs Covered with HFCVD Diamond of Different Thickness." MRS Proceedings 1275 (January 2010). http://dx.doi.org/10.1557/proc-1275-s3-50.

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Pinho, Monica, Gustavo Pinto, Pedro Mesquita, Filipe Silva, Julio Souza, Afonso Ferreira, and Bruno Henriques. "Damage on tooth enamel after removal of orthodontic adhesive by Arkansas’ stone and tungsten carbide burs." Revista Portuguesa de Estomatologia, Medicina Dentária e Cirurgia Maxilofacial 58, no. 1 (May 15, 2017). http://dx.doi.org/10.24873/j.rpemd.2017.05.011.

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Journal articles on the topic 'Tungsten carbide burs'

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