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Milić L, Kojić S, Qureshi S, Simić M, Duval RG, Petrović B, Stojanović GM. Edible Bite Force Sensor: A Novel Approach to Measuring Bite Force in Biomedical and Dental Applications. Med Sci Monit 2024; 30:e944050. [PMID: 38971968 PMCID: PMC11302276 DOI: 10.12659/msm.944050] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2024] [Accepted: 03/13/2024] [Indexed: 07/08/2024] Open
Abstract
BACKGROUND Measurement of bite force plays a crucial role in assessment of the masticatory system. With a growing interest in detecting occlusal irregularities, bite force sensors have garnered attention in the biomedical field. This study aimed to introduce a hydrogel bite force sensor, based on hydroxyethyl-cellulose-fructose-water (HEC-F-water), for premolar and molar teeth, and to evaluate it using optical profilometry, infrared spectroscopy (FTIR), and Instron Tension testing system, with 2.5 cm (1 inch) margins at top, bottom, right, and left. MATERIAL AND METHODS We fabricated 20 HEC-F-water hydrogel samples sized with surface of 1×1 cm, with 2 different widths - 1 mm and 5 mm. The samples were characterized using optical profilometry and FTIR and their electrical characteristics were determined using an impedance analyzer. Aluminum (Al) electrodes, fabricated using Cutting Plotter, were used to form a HEC-F-water-based transducer, which was used for bite force sensing. The Instron tensile testing system was employed, utilizing 3D printed models of the upper and lower jaw, to simulate biting. Forces in the range between 40 N and 540 N were exerted upon the transducer, and the output change in the electrical signal was measured. RESULTS The study determined the transfer function between bite force and capacitance. The fabricated sensor exhibited a sensitivity of 3.98 pF/N, an input range of 500 N, output range of 2 nF, and accuracy of 95.9%. CONCLUSIONS This study introduces an edible bite force sensor employing an edible hydrogel as a dielectric, presenting a novel avenue in the development of edible sensorics in dentistry.
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Affiliation(s)
- Lazar Milić
- Faculty of Technical Sciences, University of Novi Sad, Novi Sad, Serbia
| | - Sanja Kojić
- Faculty of Technical Sciences, University of Novi Sad, Novi Sad, Serbia
| | - Saima Qureshi
- Faculty of Technical Sciences, University of Novi Sad, Novi Sad, Serbia
| | - Mitar Simić
- Faculty of Technical Sciences, University of Novi Sad, Novi Sad, Serbia
| | | | - Bojan Petrović
- Department of Dentistry, Faculty of Medicine, University of Novi Sad, Novi Sad, Serbia
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Bahadır HS, Bulut AC, Yılmaz B. Effect of preparation design on the fracture resistance and fracture patterns of 3D printed one-piece endodontic crowns. J Prosthet Dent 2024:S0022-3913(24)00423-2. [PMID: 38960755 DOI: 10.1016/j.prosdent.2024.06.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2024] [Revised: 06/06/2024] [Accepted: 06/11/2024] [Indexed: 07/05/2024]
Abstract
STATEMENT OF PROBLEM The impact of various preparation designs on the fracture resistance and fracture type of mandibular premolars restored with 3 dimensionally (3D) printed, 1-piece endodontic crowns remains unclear. PURPOSE The purpose of this study was to investigate the effect of different preparation designs on the fracture resistance and fracture patterns of mandibular premolars restored with 3D printed 1-piece endodontic crowns after thermal aging. MATERIAL AND METHODS Forty-five freshly extracted mandibular premolars received 3 different preparation designs: with at least 2 intact cuspal walls (2CW), with only 1 intact cuspal wall (1CW), and no cuspal wall present (NoCW). One-piece endodontic crowns were designed by using a computer-aided design (CAD) software program, 3D printed, cemented to the prepared teeth with self-adhesive resin cement, and thermocycled between 5 °C and 55 °C in artificial saliva. Subsequently, all specimens were subjected to a fracture test. The results were statistically analyzed using 1-way ANOVA (α=.05), and fracture types of all specimens were examined using a light microscope. RESULTS The analysis of fracture resistance values across separate designs revealed no statistically significant differences (P>.05). Mean fracture resistance values were 724.5 N in 2CW, 713 N in 1CW, and 861 N in NoCW. In 2CW and 1CW, the 1-piece endodontic crowns mostly displayed Type III fractures, whereas those in NoCW exhibited a combination of Type II and Type III fractures. CONCLUSIONS The mandibular premolar 1-piece endodontic crowns tested in this study exhibited similar fracture resistance and type of fracture with different preparation designs.
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Affiliation(s)
- Hasibe Sevilay Bahadır
- Assistant Professor, Department of Restorative Dentistry, Faculty of Dentistry, Ankara Yıldırım Beyazıt University, Ankara, Turkey
| | - Ali Can Bulut
- Associate Professor, Department of Prosthodontic Dentistry, Faculty of Dentistry, Ankara Yıldırım Beyazıt University, Ankara, Turkey.
| | - Burak Yılmaz
- Associate Professor, Department of Reconstructive Dentistry and Gerodontology, School of Dental Medicine, University of Bern, Bern, Switzerland; Associate Professor, Department of Restorative, Preventive and Pediatric Dentistry, School of Dental Medicine, University of Bern, Bern, Switzerland; and Adjunct Professor, Division of Restorative and Prosthetic Dentistry, The Ohio State University, Columbus, Ohio
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Hernaiz-García M, Zanolli C, Martín-Francés L, Mazurier A, Benazzi S, Sarig R, Fu J, Kullmer O, Fiorenza L. Masticatory habits of the adult Neanderthal individual BD 1 from La Chaise-de-Vouthon (France). AMERICAN JOURNAL OF BIOLOGICAL ANTHROPOLOGY 2024; 184:e24926. [PMID: 38420653 DOI: 10.1002/ajpa.24926] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/04/2023] [Revised: 02/05/2024] [Accepted: 02/18/2024] [Indexed: 03/02/2024]
Abstract
OBJECTIVES The analysis of dental wear provides a useful approach for dietary and cultural habit reconstructions of past human populations. The analysis of macrowear patterns can also be used to better understand the individual chewing behavior and to investigate the biomechanical responses during different biting scenarios. The aim of this study is to evaluate the diet and chewing performance of the adult Neanderthal Bourgeois-Delaunay 1 (BD 1) and to investigate the relationship between wear and cementum deposition under mechanical demands. MATERIALS AND METHODS The macrowear pattern of BD 1 was analyzed using the occlusal fingerprint analysis method. We propose a new method for the bilateral measurement of the cementum volume along both buccal and lingual sides of the molar root. RESULTS BD 1's anterior dentition is more affected by wear compared to the posterior one. The macrowear pattern suggest a normal chewing behavior and a mixed-diet coming from temperate environments. The teeth on the left side of the mandible display greater levels of wear, as well as the buccal side of the molar crowns. The cementum analysis shows higher buccal volume along the molar roots. DISCUSSION BD1 could have been preferably chewing on the left side of the mandible. The exploitation of various food resources suggested by the macrowear analysis is compatible with the environmental reconstructions. Finally, the greater wear on the buccal side of the molar occlusal surface and the greater volume of cementum in that side of the molar roots offers a preliminary understanding about the potential correlation between dental wear and cementum deposition.
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Affiliation(s)
- María Hernaiz-García
- Monash Biomedicine Discovery Institute, Department of Anatomy and Developmental Biology, Monash University, Melbourne, Australia
| | | | - Laura Martín-Francés
- Monash Biomedicine Discovery Institute, Department of Anatomy and Developmental Biology, Monash University, Melbourne, Australia
- Department of Paleobiology, CENIEH, Burgos, Spain
| | - Arnaud Mazurier
- CNRS, Institut de Chimie des Milieux et Matériaux de Poitiers-IC2MP, Université de Poitiers, Poitiers, France
| | - Stefano Benazzi
- Department of Cultural Heritage, University of Bologna, Ravenna, Italy
| | - Rachel Sarig
- Department of Oral Biology, The Goldschleger School of Dental Medicine, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
- Dan David Center for Human Evolution and Biohistory Research, Sackler Faculty of Medicine, Tel-Aviv University, Tel Aviv, Israel
| | - Jing Fu
- Department of Mechanical and Aerospace Engineering, Monash University, Melbourne, Australia
| | - Ottmar Kullmer
- Division of Palaeoanthropology, Senckenberg Research Institute and Natural History Museum Frankfurt, Frankfurt am Main, Germany
- Department of Palaeobiology and Environment, Institute of Ecology, Evolution, and Diversity, Goethe University, Frankfurt, Germany
| | - Luca Fiorenza
- Monash Biomedicine Discovery Institute, Department of Anatomy and Developmental Biology, Monash University, Melbourne, Australia
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Holmes MA, Terhune CE, Chalk-Wilayto J, Yoakum CB, Taylor P, Ramirez R, Solís MP, Polvadore TA, Ross CF, Taylor AB, Fogaca MD, Laird MF. Ontogenetic changes in jaw leverage and skull shape in tufted and untufted capuchins. J Morphol 2024; 285:e21705. [PMID: 38704727 DOI: 10.1002/jmor.21705] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2024] [Revised: 04/19/2024] [Accepted: 04/24/2024] [Indexed: 05/07/2024]
Abstract
The ontogeny of feeding is characterized by shifting functional demands concurrent with changes in craniofacial anatomy; relationships between these factors will look different in primates with disparate feeding behaviors during development. This study examines the ontogeny of skull morphology and jaw leverage in tufted (Sapajus) and untufted (Cebus) capuchin monkeys. Unlike Cebus, Sapajus have a mechanically challenging diet and behavioral observations of juvenile Sapajus suggest these foods are exploited early in development. Landmarks were placed on three-dimensional surface models of an ontogenetic series of Sapajus and Cebus skulls (n = 53) and used to generate shape data and jaw-leverage estimates across the tooth row for three jaw-closing muscles (temporalis, masseter, medial pterygoid) as well as a weighted combined estimate. Using geometric morphometric methods, we found that skull shape diverges early and shape is significantly different between Sapajus and Cebus throughout ontogeny. Additionally, jaw leverage varies with age and position on the tooth row and is greater in Sapajus compared to Cebus when calculated at the permanent dentition. We used two-block partial least squares analyses to identify covariance between skull shape and each of our jaw muscle leverage estimates. Sapajus, but not Cebus, has significant covariance between all leverage estimates at the anterior dentition. Our findings show that Sapajus and Cebus exhibit distinct craniofacial morphologies early in ontogeny and strong covariance between leverage estimates and craniofacial shape in Sapajus. These results are consistent with prior behavioral and comparative work suggesting these differences are a function of selection for exploiting mechanically challenging foods in Sapajus, and further emphasize that these differences appear quite early in ontogeny. This research builds on prior work that has highlighted the importance of understanding ontogeny for interpreting adult morphology.
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Affiliation(s)
- Megan A Holmes
- Department of Family Medicine and Community Health, Duke University School of Medicine, Durham, North Carolina, USA
| | - Claire E Terhune
- Department of Anthropology, University of Arkansas, Fayetteville, North Carolina, USA
| | - Janine Chalk-Wilayto
- Department of Biomedical Sciences, Mercer University School of Medicine, Savannah, Georgia, USA
| | - Caitlin B Yoakum
- Department of Anatomy, Arkansas College of Health Education, Fort Smith, Arkansas, USA
| | - Parker Taylor
- Department of Anthropology, University of Arkansas, Fayetteville, North Carolina, USA
| | - Rocio Ramirez
- Department of Integrative Anatomical Sciences, University of Southern California, Los Angeles, California, USA
| | - Megan P Solís
- Department of Anthropology, Stony Brook University, Stony Brook, New York, USA
| | - Taylor A Polvadore
- Department of Anthropology, University of Arkansas, Fayetteville, North Carolina, USA
| | - Callum F Ross
- Department of Organismal Biology and Anatomy, University of Chicago, Chicago, Illinois, USA
| | - Andrea B Taylor
- Department of Foundational Biomedical Sciences, Touro University California, Vallejo, California, USA
| | | | - Myra F Laird
- Department of Basic and Translational Sciences, University of Pennsylvania, Philadelphia, Pennsylvania, USA
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Katrenova Z, Alisherov S, Yergibay M, Kappasov Z, Blanc W, Tosi D, Molardi C. Bite Force Mapping Based on Distributed Fiber Sensing Network Approach. SENSORS (BASEL, SWITZERLAND) 2024; 24:537. [PMID: 38257630 PMCID: PMC10820053 DOI: 10.3390/s24020537] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/10/2023] [Revised: 12/29/2023] [Accepted: 01/03/2024] [Indexed: 01/24/2024]
Abstract
Bite force measurements are crucial in the realm of biomedical research, particularly in the areas of dentistry and orthodontic care. Various intraoral devices have been used to assess biting force, but each has limitations and drawbacks. Fiber optic sensors (FOSs) offer advantages such as electrical inertness, immunity to electromagnetic interference, and high sensitivity. Distributed fiber optic sensing allows an increase in the number of sensing points and can interrogate numerous reflections from scattering events within an optical fiber. We present four dental bites with heights of 6 mm, which enabled bilateral measurements. U-shaped sensors were prepared by embedding fibers into silicone by folding a single-mode fiber into four lines and multiplexing eight parallel nanoparticle-doped fibers. Dental bite models were created using two silicone materials (Sorta Clear 18 and Sorta Clear 40). The developed sensors were calibrated by applying weights up to 900 g, resulting in a linear response. Experiments were conducted to compare the efficacy of the dental bites. The collection of massive data was enabled by constructing a 2D map of the dental bites during multi-point sensing.
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Affiliation(s)
- Zhanerke Katrenova
- Department of Electrical and Computer Engineering, School of Engineering and Digital Sciences, Nazarbayev University, Astana 010000, Kazakhstan; (S.A.); (D.T.)
| | - Shakhrizat Alisherov
- Department of Electrical and Computer Engineering, School of Engineering and Digital Sciences, Nazarbayev University, Astana 010000, Kazakhstan; (S.A.); (D.T.)
| | - Madina Yergibay
- Department of Robotics Engineering, School of Engineering and Digital Sciences, Nazarbayev University, Astana 010000, Kazakhstan; (M.Y.); (Z.K.)
| | - Zhanat Kappasov
- Department of Robotics Engineering, School of Engineering and Digital Sciences, Nazarbayev University, Astana 010000, Kazakhstan; (M.Y.); (Z.K.)
| | - Wilfred Blanc
- INPHYNI, CNRS UMR7010, Université Côte d’Azur, 17 rue Julien Lauprêtre, 06200 Nice, France;
| | - Daniele Tosi
- Department of Electrical and Computer Engineering, School of Engineering and Digital Sciences, Nazarbayev University, Astana 010000, Kazakhstan; (S.A.); (D.T.)
- Laboratory of Biosensors and Bioinstruments, National Laboratory Astana, Kabanbay Batyr Ave, Astana 010000, Kazakhstan
| | - Carlo Molardi
- Department of Electrical and Computer Engineering, School of Engineering and Digital Sciences, Nazarbayev University, Astana 010000, Kazakhstan; (S.A.); (D.T.)
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Zhao J, Xia S, Yue S, Luo Y, Shen P, Yang C. Factors Influencing Mandibular Deviation: A Retrospective Clinical Study. J Craniofac Surg 2024; 35:e28-e31. [PMID: 38294302 DOI: 10.1097/scs.0000000000009710] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2023] [Accepted: 06/28/2023] [Indexed: 02/01/2024] Open
Abstract
This study aimed to investigate the correlation between mandibular deviation (MD) and possible clinical factors in patients with anterior disc displacement (ADD). This retrospective clinical study enrolled 296 patients with ADD, diagnosed using magnetic resonance imaging, from 2015 to 2018. The clinical symptoms and medical histories of these patients were carefully examined and recorded. Mandibular deviation was the primary outcome variable confirmed by a combination of clinical examination and facial photographs or posteroanterior cephalograms. The primary predictor variable was ADD staging. Secondary predictor variables included condylar height and distance of disc displacement. Other predictor variables were age, sex, disease course, oral parafunctions, depression, and bone mineral density. We used logistic regression to examine the correlation between the MD and all predictor variables. The χ2 test and analysis of variance were used to exclude the correlation between the predictor variables. In this study, the prevalence of MD was 77% among 278 patients with ADD. Bilateral ADD staging significantly contributed to MD on both sides. The odds ratio increased with the deterioration of disc displacement. The present study demonstrated that the ADD staging influences the condylar height and MD, and that articular disk position should be considered while treating MD.
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Affiliation(s)
- Jiong Zhao
- Department of Oral Surgery, Ninth People's Hospital, College of Stomatology, Shanghai Jiao Tong University School of Medicine
| | - Simo Xia
- Transform Studio for Endodontium Stem Cell, Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine
| | - Shijing Yue
- Department of Oral Surgery, Ninth People's Hospital, College of Stomatology, Shanghai Jiao Tong University School of Medicine
| | - Yi Luo
- Department of Oral Surgery, Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shangai, China
| | - Pei Shen
- Department of Oral Surgery, Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shangai, China
| | - Chi Yang
- Department of Oral Surgery, Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shangai, China
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Graf T, Güth JF, Schweiger J, Erdelt KJ, Edelhoff D, Stimmelmayr M. Biomechanical behavior of implants with different diameters in relation to simulated bone loss- an in vitro study. Clin Oral Investig 2023; 27:5887-5894. [PMID: 37608240 PMCID: PMC10560161 DOI: 10.1007/s00784-023-05199-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2022] [Accepted: 08/03/2023] [Indexed: 08/24/2023]
Abstract
OBJECTIVES Bone resorption around implants could influence the resistance of the implant abutment complex (IAC). The present in vitro study aimed to assess the stability to static fatigue of implants presenting different levels of bone losses and diameters. MATERIALS AND METHODS Ninety implants with an internal conical connection with 3 different implant diameters (3.3 mm (I33), 3.8 mm (I38), and 4.3 mm (I43)) and 3 simulated bone loss settings (1.5 mm (I_15), 3.0 mm (I_30), and 4.5 mm (I_45) (n = 10)) were embedded and standard abutments were mounted. All specimens were artificially aged (1,200,000 cycles, 50 N, simultaneous thermocycling) and underwent subsequently load-to-fracture test. For statistical analysis, Kolmogorov-Smirnov test, Kruskal-Wallis test, and Mann-Whitney U test (p < 0.05) were applied. RESULTS All test specimens withstood the artificial aging without damage. The mean failure values were 382.1 (± 59.2) N (I3315), 347.0 (± 35.7) N (I3330), 315.9 N (± 30.9) (I3345), 531.4 (± 36.2) N (I3815), 514.5 (± 40.8) N (I3830), 477.9 (± 26.3) N (I3845), 710.1 (± 38.2) N (I4315), 697.9 (± 65.2) N (I4330), and 662.2 N (± 45.9) (I4345). The stability of the IACs decreased in all groups when bone loss inclined. Merely, the failure load values did not significantly differ among subgroups of I43. CONCLUSIONS Larger implant diameters and minor circular bone loss around the implant lead to a higher stability of the IAC. The smaller the implant diameter was, the more the stability was affected by the circumferential bone level. CLINICAL RELEVANCE Preserving crestal bone level is important to ensure biomechanical sustainability at implant systems with a conical interface. It seems sensible to take the effect of eventual bone loss around implants into account during implant planning processes and restorative considerations.
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Affiliation(s)
- Tobias Graf
- Department of Prosthetic Dentistry, Center for Dentistry and Oral Medicine, Goethe University Frankfurt, Theodor-Stern-Kai 7, 60596, Frankfurt am Main, Germany.
| | - Jan-Frederik Güth
- Department of Prosthetic Dentistry, Center for Dentistry and Oral Medicine, Goethe University Frankfurt, Theodor-Stern-Kai 7, 60596, Frankfurt am Main, Germany
| | - Josef Schweiger
- Department of Prosthetic Dentistry, University Hospital, Ludwig-Maximilians-University Munich, Goethestraße 70, 80336, Munich, Germany
| | - Kurt-Jürgen Erdelt
- Department of Prosthetic Dentistry, University Hospital, Ludwig-Maximilians-University Munich, Goethestraße 70, 80336, Munich, Germany
| | - Daniel Edelhoff
- Department of Prosthetic Dentistry, University Hospital, Ludwig-Maximilians-University Munich, Goethestraße 70, 80336, Munich, Germany
| | - Michael Stimmelmayr
- Department of Prosthetic Dentistry, University Hospital, Ludwig-Maximilians-University Munich, Goethestraße 70, 80336, Munich, Germany
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Bein L, Rauch A, Schmidt M, Rosentritt M. In vitro fatigue and fracture testing of temporary materials from different manufacturing processes in implant-supported anterior crowns. Clin Oral Investig 2023; 27:4215-4224. [PMID: 37133699 DOI: 10.1007/s00784-023-05038-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2023] [Accepted: 04/22/2023] [Indexed: 05/04/2023]
Abstract
OBJECTIVES The aim of this study was to investigate the in vitro fatigue and fracture force of temporary implant-supported anterior crowns made of different materials with different abutment total occlusal convergence (TOC), with/without a screw channel, and with different types of fabrication. MATERIALS AND METHODS One hundred ninety-two implant-supported crowns were manufactured (4° or 8° TOC; with/without screw channel) form 6 materials (n = 8; 2 × additive, 3 × subtractive, 1 × automix; reference). Crowns were temporarily cemented, screw channels were closed (polytetrafluoroethylene, resin composite), and crowns were stored in water (37 °C; 10 days) before thermal cycling and mechanical loading (TCML). Fracture force was determined. STATISTICS Kolmogorov-Smirnov, ANOVA; Bonferroni; Kaplan-Meier; log-rank; α = 0.05. RESULTS Failure during TCML varied between 0 failures and total failure. Mean survival was between 1.8 × 105 and 4.8 × 105 cycles. The highest impact on survival presented the material (η2 = 0.072, p < .001). Fracture forces varied between 265.7 and 628.6 N. The highest impact on force was found for the material (η2 = 0.084, p < .001). CONCLUSION Additively and subtractively manufactured crowns provided similar or higher survival rates and fracture forces compared to automix crowns. The choice of material is decisive for the survival and fracture force. The fabrication is not crucial. A smaller TOC led to higher fracture force. Manually inserted screw channels had negative effects on fatigue testing. CLINICAL RELEVANCE The highest stability has been shown for crowns with a low TOC, which are manufactured additively and subtractively. In automix-fabricated crowns, manually inserted screw channels have negative effects.
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Affiliation(s)
- Laila Bein
- Department of Prosthetic Dentistry, UKR University Hospital Regensburg, 93042, Regensburg, Germany
| | - Angelika Rauch
- Department of Prosthetic Dentistry, UKR University Hospital Regensburg, 93042, Regensburg, Germany
| | - Michael Schmidt
- Department of Prosthetic Dentistry, UKR University Hospital Regensburg, 93042, Regensburg, Germany
| | - Martin Rosentritt
- Department of Prosthetic Dentistry, UKR University Hospital Regensburg, 93042, Regensburg, Germany.
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Graf T, Schweiger J, Stimmelmayr M, Erdelt K, Schubert O, Güth JF. Influence of monolithic restorative materials on the implant-abutment interface of hybrid abutment crowns: An in vitro investigation. J Prosthodont Res 2023; 67:450-459. [PMID: 36517017 DOI: 10.2186/jpr.jpr_d_22_00115] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/01/2023]
Abstract
Purpose This in vitro study aimed to investigate the long-term performance, stability, and fracture mode of monolithic hybrid abutment crowns, and the effect of different materials on the implant-abutment interface (IAI).Methods Eighty monolithic hybrid abutment crowns luted on titanium bases were manufactured from 3Y-TZP zirconia (ZY3), "Gradient Technology" zirconia (ZY35), 5Y-TZP zirconia (ZY5), lithium disilicate ceramic (LDS), zirconia-reinforced lithium silicate ceramic (ZLS), polymer-infiltrated ceramic network (MHY), polymethylmethacrylate (PMA), and 3D-printed hybrid composite (PHC) (n = 10 for each material). Eighty implants (Camlog Progressive-Line, diameter: 3.8 mm) were embedded in accordance with ISO standard 14801, and crowns were mounted. After artificial aging (1.2 × 106 cycles, 50 N, thermocycling), intact specimens were loaded 30° off-axis in a universal testing machine until failure.Results Seven specimens in the PHC group failed during artificial aging, and all the others survived. There were two subgroups based on the one-way analysis of variance and Dunnett's test (P < 0.05) of the mean fracture load values. The first comprised Z3Y, ZY35, Z5Y, and LDS, with mean fracture loads between 499.4 and 529.7 N, while the second included ZLS, MHY, and PMA, with values in the 346.2-416.0 N range. ZY3, ZY35, ZY5, and LDS exhibited irreversible, visible deformations of the implant shoulders with varying dimensions after load-to-fracture tests.Conclusions Crowns made of LDS, ZLS, MHY, and PMA may act as potential stress breakers, and prevent possible deformation at IAIs. Further clinical studies need to assess if these materials also withstand relevant loads in-vivo.
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Affiliation(s)
- Tobias Graf
- Department of Prosthodontics, Center for Dentistry and Oral Medicine (Carolinum), Goethe University Frankfurt am Main, Germany
| | - Josef Schweiger
- Department of Prosthetic Dentistry, University Hospital, LMU Munich, Germany
| | - Michael Stimmelmayr
- Department of Prosthetic Dentistry, University Hospital, LMU Munich, Germany
| | - Kurt Erdelt
- Department of Prosthetic Dentistry, University Hospital, LMU Munich, Germany
| | - Oliver Schubert
- Department of Prosthetic Dentistry, University Hospital, LMU Munich, Germany
| | - Jan-Frederik Güth
- Department of Prosthodontics, Center for Dentistry and Oral Medicine (Carolinum), Goethe University Frankfurt am Main, Germany
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Smith RJR, McColl E, Bryce GE. Top tips for managing enamel infractions, cracks and fractures - Part 1: Diagnosis. Br Dent J 2023; 234:787-790. [PMID: 37291292 DOI: 10.1038/s41415-023-5984-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Affiliation(s)
- R J R Smith
- Enhanced Practitioner, Defence Centre for Rehabilitative Dentistry, Evelyn Woods Road, Aldershot, GU11 2LS, United Kingdom.
| | - E McColl
- Director of Clinical Dentistry, Peninsula Dental School (University of Plymouth), Plymouth, United Kingdom.
| | - G E Bryce
- Consultant in Restorative Dentistry, Defence Centre for Rehabilitative Dentistry, Evelyn Woods Road, Aldershot, GU11 2LS, United Kingdom.
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Lovera-Prado K, Vanaclocha V, Atienza CM, Vanaclocha A, Jordá-Gómez P, Saiz-Sapena N, Vanaclocha L. Barbed Dental Ti6Al4V Alloy Screw: Design and Bench Testing. MATERIALS (BASEL, SWITZERLAND) 2023; 16:2228. [PMID: 36984107 PMCID: PMC10054258 DOI: 10.3390/ma16062228] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/22/2023] [Revised: 03/01/2023] [Accepted: 03/07/2023] [Indexed: 06/18/2023]
Abstract
BACKGROUND CONTEXT Dental implants are designed to replace a missing tooth. Implant stability is vital to achieving osseointegration and successful implantation. Although there are many implants available on the market, there is room for improvement. PURPOSE We describe a new dental implant with improved primary stability features. STUDY DESIGN Lab bench test studies. METHODS We evaluated the new implant using static and flexion-compression fatigue tests with compression loads, 35 Ncm tightening torque, displacement control, 0.01 mm/s actuator movement speed, and 9-10 Hz load application frequency, obtaining a cyclic load diagram. We applied variable cyclic loadings of predetermined amplitude and recorded the number of cycles until failure. The test ended with implant failure (breakage or permanent deformation) or reaching five million cycles for each load. RESULTS Mean stiffness was 1151.13 ± 133.62 SD N/mm, mean elastic limit force 463.94 ± 75.03 SD N, and displacement 0.52 ± 0.04 SD mm, at failure force 663.21 ± 54.23 SD N and displacement 1.56 ± 0.18 SD mm, fatigue load limit 132.6 ± 10.4 N, and maximum bending moment 729.3 ± 69.43 mm/N. CONCLUSIONS The implant fatigue limit is satisfactory for incisor and canine teeth and between the values for premolars and molars for healthy patients. The system exceeds five million cycles when subjected to a 132.60 N load, ensuring long-lasting life against loads below the fatigue limit.
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Affiliation(s)
- Keila Lovera-Prado
- CIRU-IMPLANT, S.L., Avenida Cornellà, 2-BJ, Esplugues de Llobregat, 08950 Barcelona, Spain
| | - Vicente Vanaclocha
- Department of Surgery, School of Medicine, University of Valencia, 46010 Valencia, Spain
| | - Carlos M. Atienza
- Biomechanical Engineer, Biomechanics Institute of Valencia, Polytechnic University of Valencia, 46022 Valencia, Spain
| | - Amparo Vanaclocha
- Biomechanical Engineer, Biomechanics Institute of Valencia, Polytechnic University of Valencia, 46022 Valencia, Spain
| | - Pablo Jordá-Gómez
- Hospital General Universitario de Castellón, 12004 Castellón de la Plana, Spain
| | | | - Leyre Vanaclocha
- Medius Klinik, Ostfildern-Ruit Klinik für Urologie, Hedelfinger Strasse 166, 73760 Ostfildern, Germany
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12
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Schweiger J, Erdelt KJ, Graf T, Sciuk T, Edelhoff D, Güth JF. The Fracture Load as a Function of the Material Thickness: The Key to Computing the Strength of Monolithic All-Ceramic Materials? MATERIALS (BASEL, SWITZERLAND) 2023; 16:1997. [PMID: 36903110 PMCID: PMC10004144 DOI: 10.3390/ma16051997] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/23/2023] [Revised: 02/18/2023] [Accepted: 02/25/2023] [Indexed: 06/18/2023]
Abstract
The thickness of a material has a significant impact on its fracture load. The aim of the study was to find and describe a mathematical relationship between the material thickness and the fracture load for dental all-ceramics. In total, 180 specimens were prepared from a leucite silicate ceramic (ESS), a lithium disilicate ceramic (EMX), and a 3Y-TZP zirconia ceramic (LP) in five thicknesses (0.4, 0.7, 1.0, 1.3, and 1.6 mm; n = 12). The fracture load of all specimens was determined using the biaxial bending test according to the DIN EN ISO 6872. The regression analyses for the linear, quadratic, and cubic curve characteristics of the materials were conducted, and the cubic regression curves showed the best correlation (coefficients of determination (R2): ESS R2 = 0.974, EMX R2 = 0.947, LP R2 = 0.969) for the fracture load values as a function of the material thickness. A cubic relationship could be described for the materials investigated. Applying the cubic function and material-specific fracture-load coefficients, the respective fracture load values can be calculated for the individual material thicknesses. These results help to improve and objectify the estimation of the fracture loads of restorations, to enable a more patient- and indication-centered situation-dependent material choice.
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Affiliation(s)
- Josef Schweiger
- Department of Prosthetic Dentistry, University Hospital, LMU Munich, 80336 Munich, Germany
| | - Kurt-Jürgen Erdelt
- Department of Prosthetic Dentistry, University Hospital, LMU Munich, 80336 Munich, Germany
| | - Tobias Graf
- Department of Prosthodontics, Center for Dentistry and Oral Medicine (Carolinum), Goethe University Frankfurt, 60596 Frankfurt am Main, Germany
| | - Thomas Sciuk
- Thomas Sciuk, Private Practice Dr Thomas Sciuk, Prinzregentenstrasse 8, 86150 Augsburg, Germany
| | - Daniel Edelhoff
- Department of Prosthetic Dentistry, University Hospital, LMU Munich, 80336 Munich, Germany
| | - Jan-Frederik Güth
- Department of Prosthodontics, Center for Dentistry and Oral Medicine (Carolinum), Goethe University Frankfurt, 60596 Frankfurt am Main, Germany
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13
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Werneck RD, Queiroz DA, Freitas MIM, Rio DLD, Turssi CP. Association of Non-carious Cervical Lesions with Oral Hygiene Aspects and Occlusal Force. J Contemp Dent Pract 2023; 24:71-79. [PMID: 37272137 DOI: 10.5005/jp-journals-10024-3457] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
AIM The purpose of this case-control (CT) study was to investigate the association between the presence of non-carious cervical lesions (NCCLs) with occlusal force and other potential risk factors. MATERIALS AND METHODS Thirty-nine participants with NCCLs [cases (CS)] and 39 with no NCCLs [control (CT)] attending the dental clinic of the Faculdades Integradas São Pedro (FAESA), located in Brazil, were enrolled in this study. Information was collected through anamnesis, clinical examination, and a questionnaire addressing aspects related to tooth brushing, dentifrice, and mouthwash use. In clinical examination, patients were submitted to four measurements of occlusal force in the maxillary first premolars and maxillary first molars, using a strain gauge sensor of medium intensity, the Flexiforce (Tekscan, South Boston, Massachusetts, United States of America). The sensor was calibrated for the unit of measurement in Newtons (N). Data were analyzed using a student's t-test and multiple logistic regression, e with a significance level of 5%. RESULTS There was no statistically significant difference between the case and CT groups regarding the bite force in the four measured regions. Logistic regression identified sex as a factor significantly associated with NCCLs (p = 0.020). The odds ratio showed the female sex had more chance (OR = 6.082; CI = 1.332-27.765) of having NCCLs. CONCLUSION It is concluded that females presented a higher risk factor for NCCLs than men. In contrast, there was no association of occlusal force, as well as aspects related to brushing and deleterious habits. CLINICAL SIGNIFICANCE Females have a higher risk factor for non-carious lesions than men.
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Affiliation(s)
- Rafael Dario Werneck
- Department of Prosthodontics, College of Dentistry, FAESA - Centro Universitário, Vitória, Espírito Santo, Brazil, Orcid: https://orcid.org/0000-0002-4862-1354
| | - Daher Antonio Queiroz
- Department of Restorative Dentistry and Prosthodontics, The University of Texas Health Science Center at Houston (UT Health); School of Dentistry, Houston, Texas, United States of America, Orcid: https://orcid.org/0000-0002-1477-8599
| | - Mariana Itaborai Moreira Freitas
- Department of Prosthodontics and Periodontology, University of Campinas - Piracicaba Dental School, Piracicaba, Sao Paulo, Brazil, Phone: +55 19 2106-5211, e-mail: , Orcid: https://orcid.org/0000-0001-7729-8536
| | - Diana Leyva Del Rio
- Division of Restorative and Prosthetic Dentistry, The Ohio State University College of Dentistry, Columbus, Ohio, United States of America, Orcid: https://orcid.org/0000-0001-7584-4302
| | - Cecilia Pedroso Turssi
- Division of Cariology and Restorative Dentistry, Sao Leopoldo Mandic Institute and Dental Research Center, Campinas, Sao Paulo, Brazil, Orcid: https://orcid.org/0000-0002-0078-9895
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14
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Baldi A, Carossa M, Comba A, Alovisi M, Femiano F, Pasqualini D, Berutti E, Scotti N. Wear Behaviour of Polymer-Infiltrated Network Ceramics, Lithium Disilicate and Cubic Zirconia against Enamel in a Bruxism-Simulated Scenario. Biomedicines 2022; 10:biomedicines10071682. [PMID: 35884986 PMCID: PMC9313215 DOI: 10.3390/biomedicines10071682] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2022] [Revised: 07/08/2022] [Accepted: 07/11/2022] [Indexed: 11/16/2022] Open
Abstract
The present study aimed to evaluate the wear rate of polymer-infiltrated network composites and ceramics against enamel in a bruxism-simulated scenario. Ninety-six (n = 96) molars were divided into six groups (n = 16) according to their occlusal material: group 1—a polymer-infiltrated network ceramic (PINC); group 2—a second polymer-infiltrated network ceramic (PINC2); group 3—nanohybrid resin-based composite (CO); group 4—cubic zirconia (ZR); group 5—lithium disilicate (LS); and group 6—sound enamel (EN). A laser scanner was used to digitalize all of the occlusal surfaces before and after a fatigue test, which was conducted with a chewing simulator set at 80 N and semicircular movement in order to simulate bruxist movement and loads. Statistical analysis of volume loss was performed with a one-way ANOVA and post hoc Bonferroni test. ZR had significantly inferior wear to PINC (p ≤ 0.01) and CO (p = 0.04). LS wore the antagonist enamel significantly more than PINC, CO, PINC2 and EN (p ≤ 0.01). On the other hand, ZR wore the antagonist enamel significantly more than CO (p ≤ 0.01) and PINC2 (p = 0.05). In conclusion, PINCs better preserved antagonist enamel at the expense of a higher wear of their own. LS causes significantly higher enamel wear compared with PINCs. ZR caused significantly higher enamel wear compared with CO and PINC2, but it was wear-resistant.
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Affiliation(s)
- Andrea Baldi
- Department of Surgical Sciences, CIR Dental School, University of Turin, Via Nizza 230, 10126 Turin, Italy; (A.B.); (A.C.); (M.A.); (D.P.); (E.B.); (N.S.)
| | - Massimo Carossa
- Department of Surgical Sciences, CIR Dental School, University of Turin, Via Nizza 230, 10126 Turin, Italy; (A.B.); (A.C.); (M.A.); (D.P.); (E.B.); (N.S.)
- Correspondence:
| | - Allegra Comba
- Department of Surgical Sciences, CIR Dental School, University of Turin, Via Nizza 230, 10126 Turin, Italy; (A.B.); (A.C.); (M.A.); (D.P.); (E.B.); (N.S.)
| | - Mario Alovisi
- Department of Surgical Sciences, CIR Dental School, University of Turin, Via Nizza 230, 10126 Turin, Italy; (A.B.); (A.C.); (M.A.); (D.P.); (E.B.); (N.S.)
| | - Felice Femiano
- Restorative Dentistry, Multidisciplinary Department of Medical-Surgical and Dental Specialties, University of Study of Campania, “Luigi Vanvitelli”, Via De Crecchio 6, 83138 Naples, Italy;
| | - Damiano Pasqualini
- Department of Surgical Sciences, CIR Dental School, University of Turin, Via Nizza 230, 10126 Turin, Italy; (A.B.); (A.C.); (M.A.); (D.P.); (E.B.); (N.S.)
| | - Elio Berutti
- Department of Surgical Sciences, CIR Dental School, University of Turin, Via Nizza 230, 10126 Turin, Italy; (A.B.); (A.C.); (M.A.); (D.P.); (E.B.); (N.S.)
| | - Nicola Scotti
- Department of Surgical Sciences, CIR Dental School, University of Turin, Via Nizza 230, 10126 Turin, Italy; (A.B.); (A.C.); (M.A.); (D.P.); (E.B.); (N.S.)
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15
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Chakraborty A, Datta P, Kumar CS, Majumder S, Roychowdhury A. Probing combinational influence of design variables on bone biomechanical response around dental implant-supported fixed prosthesis. J Biomed Mater Res B Appl Biomater 2022; 110:2338-2352. [PMID: 35567493 DOI: 10.1002/jbm.b.35081] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2021] [Revised: 04/03/2022] [Accepted: 04/18/2022] [Indexed: 11/08/2022]
Abstract
This study aimed to understand the effect of physiological and dental implant-related parameter variations on the osseointegration for an implant-supported fixed prosthesis. Eight design factors were considered (implant shape, diameter, and length; thread pitch, depth, and profile; cantilever [CL] length and implant-loading protocol). Total 36 implantation scenarios were simulated using finite element method based on Taguchi L36 orthogonal array. Three patient-specific bone conditions were also simulated by scaling the density and Young's modulus of a mandible sample to mimic weak, normal, and strong bones. Taguchi method was employed to determine the significance of each design factor in controlling the peri-implant cortical bone microstrain. For normal bone condition, CL length had the maximum contribution (28%) followed by implant diameter (18%), thread pitch (14%), implant length (8%), and thread profile (5%). For strong bone condition, CL and implant diameter had equal contribution (32%) followed by thread pitch (7%) and implant length (5%). For weak bone condition, implant diameter had the highest contribution (31%) followed by CL length (30%), thread pitch (11%) and implant length (8%). The presence of distal CL in dental framework was found to be the most influential design factor, which can cause high strain in the cervical cortical bone. It was seen that implant diameter had more effect compared to implant length toward peri-implant bone biomechanical response. Implant-loading time had no significant effect towards peri-implant bone biomechanical response, signifying immediate loading is possible with sufficient mechanical retention.
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Affiliation(s)
- Arindam Chakraborty
- Department of Aerospace Engineering and Applied Mechanics, Indian Institute of Engineering Science and Technology, Howrah, West Bengal, India
| | - Pallab Datta
- Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research, Kolkata, West Bengal, India
| | - Cheruvu Siva Kumar
- Department of Mechanical Engineering, Indian Institute of Technology, Kharagpur, West Bengal, India
| | - Santanu Majumder
- Department of Aerospace Engineering and Applied Mechanics, Indian Institute of Engineering Science and Technology, Howrah, West Bengal, India
| | - Amit Roychowdhury
- Department of Aerospace Engineering and Applied Mechanics, Indian Institute of Engineering Science and Technology, Howrah, West Bengal, India
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16
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Takakusaki K, Murakami N, Wada J, Kasai T, Matsuno H, Yamazaki T, Iwasaki N, Yatabe M, Takahashi H, Wakabayashi N. Effect of retention hole designs in artificial teeth on failure resistance of the connection with thermoplastic resin. Dent Mater J 2022; 41:573-579. [PMID: 35418549 DOI: 10.4012/dmj.2021-328] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
This study aimed to evaluate the effect of retention hole designs in artificial teeth on failure resistance of the connection with a thermoplastic denture base resin. Artificial teeth with the following retention hole designs were attached to polyester and polyamide resins: no hole, vertical hole, horizontal hole, and vertical and horizontal holes. An artificial tooth with no hole attached to polymethyl methacrylate was prepared as the control. The load was applied until connection failure occurred between the artificial tooth and resin, and failure resistance was detected. Although the control showed the highest resistance, the artificial tooth with vertical and horizontal holes showed higher resistance than those with other retention hole designs in both thermoplastic resins. Providing vertical and horizontal retention holes in artificial teeth may be effective in improving failure resistance of the connection with thermoplastic resins.
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Affiliation(s)
- Kensuke Takakusaki
- Advanced Prosthodontics, Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University
| | - Natsuko Murakami
- Advanced Prosthodontics, Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University
| | - Junichiro Wada
- Advanced Prosthodontics, Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University
| | - Taihei Kasai
- Advanced Prosthodontics, Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University
| | - Hitomi Matsuno
- Advanced Prosthodontics, Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University
| | - Toshiki Yamazaki
- Advanced Prosthodontics, Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University
| | - Naohiko Iwasaki
- Oral Biomaterial Development Engineering, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University
| | - Masaru Yatabe
- Advanced Prosthodontics, Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University
| | - Hidekazu Takahashi
- Oral Biomaterial Development Engineering, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University
| | - Noriyuki Wakabayashi
- Advanced Prosthodontics, Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University
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17
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Vaquette C, Mitchell J, Ivanovski S. Recent Advances in Vertical Alveolar Bone Augmentation Using Additive Manufacturing Technologies. Front Bioeng Biotechnol 2022; 9:798393. [PMID: 35198550 PMCID: PMC8858982 DOI: 10.3389/fbioe.2021.798393] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2021] [Accepted: 12/13/2021] [Indexed: 11/26/2022] Open
Abstract
Vertical bone augmentation is aimed at regenerating bone extraskeletally (outside the skeletal envelope) in order to increase bone height. It is generally required in the case of moderate to severe atrophy of bone in the oral cavity due to tooth loss, trauma, or surgical resection. Currently utilized surgical techniques, such as autologous bone blocks, distraction osteogenesis, and Guided Bone Regeneration (GBR), have various limitations, including morbidity, compromised dimensional stability due to suboptimal resorption rates, poor structural integrity, challenging handling properties, and/or high failure rates. Additive manufacturing (3D printing) facilitates the creation of highly porous, interconnected 3-dimensional scaffolds that promote vascularization and subsequent osteogenesis, while providing excellent handling and space maintaining properties. This review describes and critically assesses the recent progress in additive manufacturing technologies for scaffold, membrane or mesh fabrication directed at vertical bone augmentation and Guided Bone Regeneration and their in vivo application.
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18
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Ortiz A, Schander-Triplett K, Bailey SE, Skinner MM, Hublin JJ, Schwartz GT. Enamel thickness variation in the deciduous dentition of extant large-bodied hominoids. AMERICAN JOURNAL OF PHYSICAL ANTHROPOLOGY 2020; 173:500-513. [PMID: 32767577 DOI: 10.1002/ajpa.24106] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/10/2019] [Revised: 05/16/2020] [Accepted: 06/11/2020] [Indexed: 11/09/2022]
Abstract
OBJECTIVES Enamel thickness features prominently in hominoid evolutionary studies. To date, however, studies of enamel thickness in humans, great apes, and their fossil relatives have focused on the permanent molar row. Comparatively little research effort has been devoted to tissue proportions within deciduous teeth. Here we attempt to fill this gap by documenting enamel thickness variation in the deciduous dentition of extant large-bodied hominoids. MATERIALS AND METHODS We used microcomputed tomography to image dental tissues in 80 maxillary and 78 mandibular deciduous premolars of Homo sapiens, Pan troglodytes, Gorilla, and Pongo. Two-dimensional virtual sections were created from the image volumes to quantify average (AET) and relative (RET) enamel thickness, as well as its distribution across the crown. RESULTS Our results reveal no significant differences in enamel thickness among the great apes. Unlike the pattern present in permanent molars, Pongo does not stand out as having relatively thicker-enameled deciduous premolars than P. troglodytes and Gorilla. Humans, on the other hand, possess significantly thicker deciduous premolar enamel in comparison to great apes. Following expectations from masticatory biomechanics, we also find that the "functional" side (protocone, protoconid) of deciduous premolars generally possesses thicker enamel than the "nonfunctional" side. DISCUSSION Our study lends empirical support to anecdotal observations that patterns of AET and RET observed for permanent molars of large-bodied apes do not apply to deciduous premolars. By documenting enamel thickness variation in hominoid deciduous teeth, this study provides the comparative context to interpret rates and patterns of wear of deciduous teeth and their utility in life history reconstructions.
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Affiliation(s)
- Alejandra Ortiz
- Institute of Human Origins, School of Human Evolution and Social Change, Arizona State University, Tempe, Arizona, USA.,Center for the Study of Human Origins, Department of Anthropology, New York University, New York, New York, USA
| | - Katherine Schander-Triplett
- Barrett, The Honors College, College of Liberal Arts and Sciences, Arizona State University, Tempe, Arizona, USA
| | - Shara E Bailey
- Center for the Study of Human Origins, Department of Anthropology, New York University, New York, New York, USA.,Department of Human Evolution, Max Planck Institute for Evolutionary Anthropology, Leipzig, Germany
| | - Matthew M Skinner
- Department of Human Evolution, Max Planck Institute for Evolutionary Anthropology, Leipzig, Germany.,School of Anthropology and Conservation, University of Kent, Canterbury, UK
| | - Jean-Jacques Hublin
- Department of Human Evolution, Max Planck Institute for Evolutionary Anthropology, Leipzig, Germany.,Collège de France, Paris, France
| | - Gary T Schwartz
- Institute of Human Origins, School of Human Evolution and Social Change, Arizona State University, Tempe, Arizona, USA
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