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Relevant bibliographies by topics / Tooth roots

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Academic literature on the topic 'Tooth roots'

Author: Grafiati

Published: 4 June 2021

Last updated: 5 February 2022

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Journal articles on the topic "Tooth roots"

1

Wang, X. P. "Tooth Eruption without Roots." Journal of Dental Research 92, no. 3 (January 23, 2013): 212–14. http://dx.doi.org/10.1177/0022034512474469.

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Eisner, Edward R. "Transcoronal Approach for Endodontic access to the Fourth Maxillary Premolar in Dogs." Journal of Veterinary Dentistry 7, no. 4 (December 1990): 22–23. http://dx.doi.org/10.1177/089875649000700402.

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Endodontic procedures are frequently recommended for crown fractures of the fourth maxillary premolar. The success of conventional endodontics in this multirooted tooth depends entirely on adequate access to the roots of this tooth. Direct access to all three roots of the canine fourth maxillary premolar is desirable. However, it is difficult to access the root canal system without removing significant tooth structure. The distal root is less difficult to access than the mesiobuccal or mesiopalatal root. A transcoronal technique used to approach the mesiopalatal root is described and illustrated.

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Verstraete, Frank J. M., and Cheryl H. Terpak. "Anatomical Variations in the Dentition of the Domestic Cat." Journal of Veterinary Dentistry 14, no. 4 (December 1997): 137–40. http://dx.doi.org/10.1177/089875649701400403.

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Skulls (n = 155) of adult domestic cats were examined macroscopically and anatomical variations were documented. The maxillary second premolar tooth was absent in 7.9% of cases, and was found to have a single root in 27.7%, partly fused roots in 55.1% and two fully formed roots in 9.2% of cases. The maxillary first molar tooth was absent in 2.3% of cases; a single root was present in 35.0%, a partly fused root in 34.7%, and two roots in 28.0% of cases. Supernumerary roots were found on the maxillary third premolar teeth in 10.3% of cases. Other variations were found to be extremely rare.

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Woodward, Tony M. "Extraction of Fractured Tooth Roots." Journal of Veterinary Dentistry 23, no. 2 (June 2006): 126–29. http://dx.doi.org/10.1177/089875640602300215.

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Stošić, Nenad, Stefan Dačić, Marina Ranđelović, Andrijana Jovančić, Ivana Đorđević, Maja Cvetković, Dušan Ilić, Aleksandra Petrović, and Dragica Dačić Simonović. "Morphometric Analysis of the Upper Premolars." Acta Facultatis Medicae Naissensis 33, no. 1 (March 1, 2016): 23–29. http://dx.doi.org/10.1515/afmnai-2016-0003.

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Summary Morphological and anatomical characteristics of the tooth are of great importance for clinical dentistry. These aspects of the tooth can be better conceptualized from the perspective of external and internal morphology of dental crowns and roots. The aim of this study was to determine the average total length of the upper first and second premolars, the average length of crowns, the average length of roots and to determine the most common number of the roots and root canals of these teeth. We used 41 first and 48 second extracted upper premolars.The length of these teeth was measured by a digital micrometer. The number of roots was determined visually, and each tooth was longitudinally dissected across the vestibular-palatal plane for determining the number of root canals. The average total length of the upper first premolars was 22.5 mm, the average crown length was 8.8 mm, the mean root length was 13.7 mm. The upper first premolars usually have two roots in 53.7% and two root canals in 82.9%. The average total length of the upper second premolars was 22.5 mm. The average crown length was 8.4 mm and the mean root length was 14.1 mm. The upper second premolars usually have one root in 89.6% and one root canal in 79.2%. The determined average values of the length of these teeth and the length of their crowns and roots were similar to the values of the same population reported by other authors.

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Nazaryan, R. S., Yu V. Fomenko, N. A. Shcheblikina, T. O. Kolyesova, N. V. Holik, A. S. Bilous, and O. V. Sukhostavets. "Key to success in endodontics (part 2)." Experimental and Clinical Dentistry 06-07, no. 1-2 (December 31, 2019): 31–37. http://dx.doi.org/10.35339/ecd.2019.1-2.31-37.

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Plenty variants of the teeth endodontic structure requires a thorough study of the root canal anatomy and morphology peculiarities, which will make it possible to estimate the volume and complexity of future endodontic intervention, make a prediction of the treatment result, and forecast possible complications. For an objective assessment of the tooth root system anatomical and morphological features, the main method is x-ray examination. Endodontic treatment planning requires the doctor to estimate his capabilities (in difficult cases, it is necessary to refer the patient to a specialized clinic), calculate future working time (it takes more time to treat a tooth with complex anatomy), and to have all the necessary set of endodontic instruments. If endodontic treatment is impossible, then it’s necessary to consult with a dental surgeon to select a combined approach for treatment (root apex resection, root amputation, tooth hemisection). Purpose of the study. To analyze different variants of roots and root canals anatomical structure of the lower jaw teeth according to literature sources and by X-ray pictures of the authors’ own observations. Materials and research methods. Variants of the anatomical and morphological features of the lower jaw teeth’ roots and root canals structure were analyzed according to literature sources and 405 x-rays of our own observations. The results of the study. The information presented in this article allows to deepen the clinician knowledge concerning the tooth cavity size and shape, the roots and root canals anatomy, the presence of additional channels, as well as the degree of the root canal curvature, and to choose the right channel instrumentation technique and the necessary tools. Often, the proper full working length root canal treatment depends on the degree of curvature and its location. The X-ray analysis of anatomical and morphological features of the lower jaw teeth’ roots and root canals, enables us to identify both common and individual features of a tooth anatomy. When analyzing radiographs of the lower jaw teeth, it is necessary to take into account the projection of the tooth cavity on the outer surface of the crown, as well as signs that may change due to age, caries, non-carious lesions, restorations, and trauma; also anomalies of the position of the tooth in the arch, individual anatomy of the roots, the number of roots and type of root canals, the shape of their cross section (from the orifice to the apex), the direction and length of the roots, the angle of curvature, the number of bends, their localization. For the right choice of the root canal treatment technique and the necessary tools, it is important for the clinician to know the degree of bending of the root canal. Each case requires an individual and skilled approach. Therefore, to assess the possible structural features of the tooth root system, it’s efficiently to use the most modern tools, equipment, and X-ray tactics. The literature data and the analysis of our own radiographs allow us to solve successfully and predictably difficult clinical problems of both primary treatment and retreatment endodontic cases.

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Portella, A. K., and P. P. Silveira. "Parenting: Roots of the sweet tooth." Science 345, no. 6204 (September 25, 2014): 1571–72. http://dx.doi.org/10.1126/science.345.6204.1571-c.

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Al-Ghananeem, Muna M. F., Khattar Haddadin, Abeer Salem Al-Khreisat, Moeen Al-Weshah, and Nidal Al-Habahbeh. "The Number of Roots and Canals in the Maxillary Second Premolars in a Group of Jordanian Population." International Journal of Dentistry 2014 (2014): 1–4. http://dx.doi.org/10.1155/2014/797692.

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Objectives. The aim of this study was to investigate the number of roots and root canals in the maxillary second premolar in a group of Jordanian population.Materials and Methods. A total of 217 patients, 100 female (46%) and 117 male (54%), received root canal treatment of maxillary second premolar from January 2012 to January 2014. The mean age of the patients was 32.7, ranging from 18 to 60 years. The teeth included in the study were examined clinically and radiographically for the number of roots and root canals using magnifying loupes.Results. Out of the total of 217 maxillary second premolars, 120 teeth had one root (55.3%), 96 teeth had two roots (44.2%), and one tooth had three roots (0.46%). Regarding root canal configuration, 30 teeth (13.8%) had one canal, 54 teeth (24.9%) had two canals shared in one apical foramen, 132 teeth (60.8%) had two canals with two separate apical foramina, and one tooth (0.46%) had three canals with separate apical foramina.Conclusion. The incidence of two canals (either with shared or separate apical foramina) is very high in the maxillary second premolars in Jordanian population; therefore inspection should be done for the presence of second canal whenever endodontic treatment is planned for this tooth.

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Li, Qingqing, Ke Chen, Lin Han, Yan Zhuang, Jingtao Li, and Jiangli Lin. "Automatic tooth roots segmentation of cone beam computed tomography image sequences using U-net and RNN." Journal of X-Ray Science and Technology 28, no. 5 (September 19, 2020): 905–22. http://dx.doi.org/10.3233/xst-200678.

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BACKGROUND: Automatic segmentation of individual tooth root is a key technology for the reconstruction of the three-dimensional dental model from Cone Beam Computed Tomography (CBCT) images, which is of great significance for the orthodontic, implant and other dental diagnosis and treatment planning. OBJECTIVES: Currently, tooth root segmentation is mainly done manually because of the similar gray of the tooth root and the alveolar bone from CBCT images. This study aims to explore the automatic tooth root segmentation algorithm of CBCT axial image sequence based on deep learning. METHODS: We proposed a new automatic tooth root segmentation method based on the deep learning U-net with AGs. Since CBCT sequence has a strong correlation between adjacent slices, a Recurrent neural network (RNN) was applied to extract the intra-slice and inter-slice contexts. To develop and test this new method for automatic segmentation of tooth roots using CBCT images, 24 sets of CBCT sequences containing 1160 images and 5 sets of CBCT sequences containing 361 images were used to train and test the network, respectively. RESULTS: Applying to the testing dataset, the segmentation accuracy measured by the intersection over union (IOU), dice similarity coefficient (DICE), average precision rate (APR), average recall rate (ARR), and average symmetrical surface distance (ASSD) are 0.914, 0.955, 95.8% , 95.3% , 0.145 mm, respectively. CONCLUSIONS: The study demonstrates that the new method combining attention U-net with RNN yields the promising results of automatic tooth roots segmentation, which has potential to help improve the segmentation efficiency and accuracy in future clinical practice.

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Kunita, Keisuke, Toshio Nakamura, and Kazuo Kato. "Accurate Age Estimation Using 14C Content in Japanese Human Teeth." Radiocarbon 59, no. 3 (February 20, 2017): 739–56. http://dx.doi.org/10.1017/rdc.2016.106.

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AbstractWe investigated age estimation of persons using 45 Japanese human teeth that consisted of mainly the third molar. We measured the radiocarbon content in tooth enamel hydroxyapatite from the crown as well as those in collagen and bioapatite in the root of the same tooth. Age estimations from tooth enamel apatite yielded an absolute age shift of 1.7±1.4 yr from the true age. This value suggests that estimating the age of Japanese people from tooth enamel is as accurate as the previous studies conducted in Europe and the USA. The 14C analysis of roots suggested that bioapatite is formed slightly later than collagen in the same tooth roots. The appropriate formation age ranges suggested by the tooth enamel analysis can be optimized and confirmed by using the additional F14C values of the root samples. We also noticed a characteristic trend of enamel δ13C values in comparison with the formation ages of the crowns of the teeth. The δ13C value tends to increase gradually from –13.0‰ to –11.5‰ from the 1960s to the 1970s, probably being caused by changes in the Japanese diet. This trend may support the selection of proper tooth formation age as supplemental data in addition to 14C content analyses.

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Dissertations / Theses on the topic "Tooth roots"

1

Aldsworth, Timothy Grant. "Microbial in vitro model of root surface caries." Thesis, University of Glasgow, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.360285.

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McHugh, Paul L. "In vitro studies of the permeability of tooth roots using radiolabelled molecules and electron microanalysis /." Title page, table of contents and abstract only, 1990. http://web4.library.adelaide.edu.au/theses/09DM/09dmm149.pdf.

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Ahmed, Suwayda. "Evaluation of dentine damage after rotary NiTi preparation." University of the Western Cape, 2016. http://hdl.handle.net/11394/5602.

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Magister Scientiae Dentium - MSc(Dent)
NiTi rotary instruments have shape memory and are highly flexible and super-elastic. These properties of the metal alloy allows for ease of root canal preparation to ultimately result in a root canal preparation that has a continuous taper, while canal shape and curvature is maintained. It must be noted that the NiTi rotary instrumentation may have an effect on root canal dentine, which may manifest as dentine damage. Different NiTi rotary systems on the market vary with regards to their design features and kinematics, which may influence dentine damage. The purpose of this in-vitro study was to compare the effect of four different NiTi rotary systems, as well as stainless steel files on root canal dentine. One hundred and eighty permanent human mandibular molar mesial roots were used for the study. The total samples were randomly divided into six groups, where one group (n=30) was left unprepared to serve as the control group. The remaining five groups were randomly assigned to a nickel-titanium rotary instrumentation system and one stainless steel hand file group. Group 1: Control group; Group 2: Stainless steel files group; Group 3: Wave One (Dentsply Maillefer) rotary group; Group 4: ProTaper NEXT (Dentsply Maillefer) rotary group; Group 5: iRaCe (FKG Dentaire) rotary group; Group 6: BT-Race (FKG Dentaire) rotary group.The root canal preparations were carried out according to the manufacturers' recommendations, after decoronation of the tooth crowns. Sodium hypochlorite (5,25%) and 17% EDTA was used as a root canal irrigant and a chelating agent during canal preparation. Each root segment was sectioned at 3mm, 6mm and 9mm from the apex. The root segments were observed under a stereomicroscope at 12x magnification and digital camera at 40 x magnification for the appearance of dentine damage. The images were observed by the author and an impartial second observer. Root segments were observed for the appearance of dentine damage (microcracks, craze lines or fractures), and samples were described as having 'dentine defect' or 'no dentine defect'. Data for the different groups were collected and results were calculated and the total incidence of dentine damage was as follows: Control group = 0% Stainless steel hand files group = 0% Wave One group = 56, 67% ProTaper NEXT group = 60% iRaCe group = 60% BT-Race group = 56, 67% There are no significant differences between the groups: WaveOne, ProTaper NEXT, iRACE and BT-Race. However, there is a significant difference between the four groups and the stainless steel group (p<0.0001).

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Kupczik, Kornelius Florian. "Tooth root morphology in primates and carnivores." Thesis, University College London (University of London), 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.408708.

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Couch, William Max Jr. "Root morphology and sexual dimorphism : size standards for crown and root dimenstions in adolescents." View the abstract Download the full-text PDF version, 2007. http://etd.utmem.edu/ABSTRACTS/2007-020-Couch-index.html.

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Thesis (M.S. )--University of Tennessee Health Science Center, 2007
Title from title page screen (viewed on June 10, 2008). Research advisor: Edward F. Harris, PhD Document formatted into pages (xii,163 p. : ill.). Vita. Abstract. Includes bibliographical references (p. 109-125).

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Fure, Solveig. "Studies of root surface caries prevalence and associated factors /." Göteborg : University of Göteborg, 1990. http://books.google.com/books?id=MhBqAAAAMAAJ.

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Weltman, Belinda Jessica. "Root resorption associated with orthodontic tooth movement a systematic review /." Columbus, Ohio : Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1236022079.

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8

Almqvist, Heléne. "Studies on root hard-tissue demineralization and remineralization measured by ¹²⁵I absorptiometry." Stockholm : Karolinska Institutet, 1993. http://catalog.hathitrust.org/api/volumes/oclc/29572338.html.

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Srinivasan, Soorya. "Reliability and Accuracy of Assessing TAD - Tooth Root Contact using CBCT." The Ohio State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1553782462280014.

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Preston, Kate Patricia. "The development of model systems to study root caries." Thesis, University of Liverpool, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.367552.

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Books on the topic "Tooth roots"

1

Root scaling and planing: A fundamental therapy. Chicago: Quintessence Pub. Co., 1986.

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Root-a-toot-toot. New York: Macmillan Pub. Co., 1991.

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Parks, Seyvelle. Root toot! Greenwood, SC (1504 Hwy 246N, Greenwood 29649): Sparrow House, 1996.

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International Conference on Biological Mechanisms of Tooth Eruption and Root Resorption (1988 Columbus, Ohio). Biological mechanisms of tooth eruption and root resorption. Edited by Davidovitch Zeev and National Institute of Dental Research. [s.l.]: National Institute of Dental Research, 1988.

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Root-a-toot: A phonics reader. New York, NY: Book Shop, Inc., 2009.

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Solmes, Brian W. Determining age at death in adult humans through tooth root transparency. [s.l: s.n.], 2001.

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author, Levy Thomas E., ed. The toxic tooth: How a root canal could be making you sick. Henderson, NV: MedFox Publishing, 2014.

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8

Paton, Lindsay. Digital quantification of tooth root colour as measure of age at death. Sudbury, Ont: Laurentian University, 2007.

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9

Treatment planning for traumatized teeth. 2nd ed. Hanover Park, IL: Quintessence Pub. Co., 2012.

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10

Cleary, Brian P. To root, to toot, to parachute: What is a verb? Minneapolis, Minn: Carolrhoda Books, 2001.

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Book chapters on the topic "Tooth roots"

1

Tran-The, V., and T. Do-Anh. "A Tooth Profile Design for Roots Rotors of Vacuum Pump." In Proceedings of the International Conference on Advances in Computational Mechanics 2017, 1003–16. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-10-7149-2_70.

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Smith, Tanya M., and Donald J. Reid. "Temporal Nature of Periradicular Bands (‘Striae Periradicales’) on Mammalian Tooth Roots." In Frontiers of Oral Biology, 86–92. Basel: KARGER, 2009. http://dx.doi.org/10.1159/000242397.

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Foster, Brian L., Francisco H. Nociti, and Martha J. Somerman. "Tooth Root Development." In Stem Cells in Craniofacial Development and Regeneration, 153–77. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118498026.ch8.

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Holmberg, Pernilla. "Alternatives: Extraction and Tooth Replacement." In Apical Periodontitis in Root-Filled Teeth, 117–32. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-57250-5_10.

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Brezniak, Naphtali, and Atalia Wasserstein. "Orthodontitis: The Inflammation Behind Tooth Movement and Orthodontic Root Resorption." In Biology of Orthodontic Tooth Movement, 67–101. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-26609-1_4.

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Vullo, Vincenzo. "Tooth Root Strength of Bevel Gears." In Springer Series in Solid and Structural Mechanics, 279–321. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-38632-0_6.

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Slayton, Rebecca L., and Elizabeth A. Palmer. "Primary Tooth Crown and Root Fractures." In Traumatic Dental Injuries in Children, 43–58. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-25793-4_4.

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Slayton, Rebecca L., and Elizabeth A. Palmer. "Permanent Tooth Crown and Root Fractures." In Traumatic Dental Injuries in Children, 77–110. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-25793-4_6.

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Siqueira, José F., Isabela N. Rôças, and Domenico Ricucci. "Internal Tooth Anatomy and Root Canal Instrumentation." In The Root Canal Anatomy in Permanent Dentition, 277–302. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-73444-6_10.

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Boutsioukis, Christos. "Internal Tooth Anatomy and Root Canal Irrigation." In The Root Canal Anatomy in Permanent Dentition, 303–21. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-73444-6_11.

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Conference papers on the topic "Tooth roots"

1

Sanders, Aaron, Donald R. Houser, Ahmet Kahraman, Jonny Harianto, and Sam Shon. "An Experimental Investigation of the Effect of Tooth Asymmetry and Tooth Root Shape on Root Stresses and Single Tooth Bending Fatigue Life of Gear Teeth." In ASME 2011 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/detc2011-48303.

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In this paper, effects of root fillet geometry and tooth asymmetry on tooth bending stresses and fatigue lives of spur gears are investigated. For this purpose, an existing gear analysis model, the Load Distribution Program (LDP), is employed to define four basic tooth geometry variations. These four variations are (i) symmetric tooth profiles (i.e. identical loaded and unloaded flanks) with full circular root geometry (at the maximum radius possible), (ii) symmetric tooth profiles with an elliptical root geometry, (iii) asymmetric tooth profiles (i.e. loaded and unloaded flanks at different pressure angles) with full circular root geometries, and (iv) asymmetric tooth profiles with an elliptical root geometry on the right (loaded) flank and a circular root geometry on the left flank. Under these conditions, variations (ii), (iii), and (iv) are predicted to have maximum root stresses that are 7.6%, 22.4%, and 24.3% less than that of the baseline case (i). Actual test articles representing these four variations were qualified through dimensional measurements of the profiles and the root fillet regions. The roots of several of the teeth of each gear type were instrumented and strain measurements under various tooth load levels are compared with the predictions. Single tooth bending fatigue tests were also performed to obtain fatigue data for each variation of the test gears. The resultant tooth bending fatigue performance of each gear variation is shown to correlate with the level of root stress reduction achieved. Experiments indicate that the most significant life increases compared to the baseline conditions are achieved with the last variation (asymmetric tooth profiles and an elliptical root shape), where the mean life is increased by more than 30 times. It is also shown through examination of the broken teeth that the critical locations where the cracks initiated agree well with the predicted locations of the maximum root stresses.

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Jiang, Benxiang, Yue zhang, Xiaoying Tang, and Hongjian Shi. "Region Growing Model with Edge Restrictions for Multiple Roots Tooth Segmentation." In the Third International Symposium. New York, New York, USA: ACM Press, 2019. http://dx.doi.org/10.1145/3364836.3364870.

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Syzrantsev, Vladimir, and Ksenia Syzrantseva. "Determination of stresses in tooth roots of gears by Integral Strain Gauges." In International Conference "Actual Issues of Mechanical Engineering" 2017 (AIME 2017). Paris, France: Atlantis Press, 2017. http://dx.doi.org/10.2991/aime-17.2017.136.

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Hotait, M. A., and A. Kahraman. "Estimation of Bending Fatigue Life of Hypoid Gears Using a Multiaxial Fatigue Criterion." In ASME 2013 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/detc2013-12511.

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In this study, a crack initiation life prediction methodology for the tooth bending fatigue of hypoid gears is proposed. This methodology employs a previously developed finite-element based hypoid gear root stress model [1] of face-milled and face-hobbed hypoid gears to establish the multiaxial stress time histories within the root fillet regions. These stress time histories are combined with a multiaxial crack initiation fatigue criterion to predict life distributions along roots of the pinion and the gear. The predictions of the multiaxial fatigue model are compared to those from a conventional uniaxial fatigue model to establish the necessity for a multiaxial approach. The model is exercised with an example face-milled hypoid gear set from an automotive application to demonstrate the impact of various misalignments as well as the key cutting tool parameters on the resultant tooth bending lives.

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Chao, Li-Chi, and Chung-Biau Tsay. "Stress Analysis of Spherical Gear Sets." In ASME 2009 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/detc2009-86843.

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The spherical gear is a new type of gear proposed by Mitome et al. [1]. Different from that of the conventional spur or helical gear sets, the spherical gear set can allow variable shaft angles and large axial misalignments without gear interference during the gear drive meshing [1, 2]. Geometrically, the spherical gear has two types of gear tooth profiles, the concave tooth and convex tooth. In practical transmission applications, the contact situation of a spherical gear set is very complex. To obtain a more realistic simulation result, the loaded tooth contact analysis (LTCA) has been performed by employing the finite element method (FEM). According to the derived mathematical model of spherical gear tooth surfaces, an automatic meshes generation program for three-dimensional spherical gears has been developed. Beside, tooth contact analysis (TCA) of spherical gears has been performed to simulate the contact points of the spherical gear set. Furthermore, the contact stress contours of spherical gear tooth surfaces and bending stress of tooth roots have been investigated by giving the design parameters, material properties, loadings and boundary conditions of spherical gears.

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Barone, Sandro, Alessandro Paoli, Armando V. Razionale, and Roberto Savignano. "3D Reconstruction of Individual Tooth Shapes by Integrating Dental CAD Templates and Patient-Specific Anatomy." In ASME 2014 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/detc2014-34362.

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The accurate reconstruction of a human digital dental model represents a wide research area within the orthodontic field due to its importance for the customization of patient treatments. Usually, 3-D dental root geometries are obtained by segmenting tomographic data. However, concerns about radiation doses may be raised since tomographic scans produce a greater X-ray dose than conventional 2-D panoramic radiographs (PAN). The present work is aimed at investigating the possibility to retrieve 3-D shape of individual teeth by exposing the patient to the minimum radiation dose. The proposed methodology is based on adapting general CAD templates over patient-specific dental anatomy, which is reconstructed by integrating the optical digitization of dental plaster models with a PAN image. The radiographic capturing process is simulated through the Discrete Radon Transform (DRT) and performed onto the patient crowns geometry obtained by segmenting the digital plaster model. A synthetic PAN image is then reconstructed and used to integrate the radiographic data within the digitized plaster model, thus allowing to retrieve roots information which guide the CAD templates adapting over the patient anatomy.

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Asano, A., T. Tambe, A. Taguchi, Chie Muraki Asano, T. Nakamoto, K. Tanimoto, T. Hinamoto, and M. Muneyasu. "Extraction of trabecular structures of mandible excluding tooth roots on dental panoramic radiographs using mathematical morphology." In 2006 18th International Conference on Pattern Recognition. IEEE, 2006. http://dx.doi.org/10.1109/icpr.2006.522.

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Lin, Jianping, Om A. Sharma, and Wooram Park. "Dynamic Analysis for Motor-Powered Periotomes in Dentistry." In ASME 2018 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/imece2018-88196.

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Abstract:

A periotome is a hand-held manual instrument that dentists use during tooth extraction. Using the sharp blade at the tool tip, dentists cut the periodontal ligaments that bonds the alveolar bone and the cementum surrounding the roots of teeth. Since this procedure usually requires dentists to repeatedly apply a certain level of force on the hand-held tool during the long-time procedure, it leads to dentists’ fatigue on their hands, inaccurate hand motion, and patients’ discomfort. Motorized periotomes can significantly improve the tooth extraction procedure by decreasing the force required from a dentist and reducing the procedure time. In this paper, we consider simple designs for motor-powered periotomes focusing on dynamic behaviors. Since the motor inside the tool creates motion and the hand-held tool moves as a result of dynamic response, the analysis requires detailed consideration of many factors such as tool mass, hand stiffness and damping. The motion of the tool tip should be monitored in this analysis to maximize the cutting performance. The analysis results will be used for choosing design options and parameters. This approach will be demonstrated using dynamic modeling and computer simulations.

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Johannesson, Tomas. "Detection of Land Area Wear in Automotive Synchronous Belts." In ASME 2003 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/detc2003/ptg-48021.

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Abstract:

A common way of driving the camshafts of an internal combustion engine is by synchronous belt. One of the major drawbacks is their limited durability. Several failure modes may appear. This paper considers land area wear failures. The area between two teeth on a synchronous belt is called the land area. Most of the semicircular belt profiles, used in automotive cambelt drives today, have a small backlash, i.e. the pulley groove is a little wider than the belt tooth. This allows for a relative motion between belt and pulley teeth. In a cambelt drive, in which torques are oscillating, this is the case. The movement causes wear to the land area that eventually will lead to breakage of the facing fabric, forcing the belt-pulley contact to run on the belt cord which will quickly lead to belt failure. This paper describes a method to detect the wear of land areas of synchronous belts. From surface topology measurements of the land areas at different wear stages, well-known roughness parameters are used to determine the degree of wear. The roughness parameters variations are explained by a physical wear procedure. In addition to this formerly known land area wear originating from complete meshing, another wear mechanism was discovered present near the tooth roots. The newly discovered land area wear type can be explained by seating and unseating effects.

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Zheng, Fei, WenFeng Lu, Yoke San Wong, and Kelvin Weng Chiong Foong. "GPU-Based Haptic Simulator for Dental Bone Drilling." In ASME 2011 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/detc2011-47019.

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Abstract:

Dental bone drilling is an inexact and often a blind art. Dentist risks damaging the invisible tooth roots, nerves and critical dental structures like mandibular canal and maxillary sinus. This paper presents a haptics-based jawbone drilling simulator for novice surgeons. Through the real-time training of tactile sensations based on patient-specific data, improved outcomes and faster procedures can be provided. Previously developed drilling simulators usually adopt penalty-based contact force models and often consider only spherical-shaped drill bits for simplicity and computational efficiency. In contrast, our simulator is equipped with a more precise force model, adapted from the Voxmap-PointShell (VPS) method to capture the essential features of the drilling procedure. In addition, the proposed force model can accommodate various shapes of drill bits. To achieve better anatomical accuracy, our oral model has been reconstructed from Cone Beam CT, using voxel-based method. To enhance the real-time response, the parallel computing power of Graphics Processing Units is exploited through extra efforts for data structure design, algorithms parallelization, and graphic memory utilization. Preliminary results show that the developed system can produce appropriate force feedback at different tissue layers.

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