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Herrera-Escudero TM, Toro DA, Parada-Sanchez MT. How teeth can be used to estimate sexual dimorphism? A scoping review. Forensic Sci Int 2024; 360:112061. [PMID: 38824866 DOI: 10.1016/j.forsciint.2024.112061] [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: 05/10/2023] [Revised: 03/04/2024] [Accepted: 05/09/2024] [Indexed: 06/04/2024]
Abstract
INTRODUCTION Teeth are biological structures with a high degree of hardness, density, calcification, and capacity to adapt to extrinsic factors at physical, biological, and physiological levels. Subsequently, they resist for a longer period in deteriorating environmental conditions. With dental analysis, it is possible to acquire biographical data about a person. The aim of this scoping review was to identify publications using human teeth tissues to estimate sexual dimorphism. METHODS The scoping review was carried out in the following databases: Jstor, Scielo, Science Direct, PubMed, and Scopus, using ten search strategies in English and guaranteeing completeness and reproducibility of the phases stipulated in the PRISMA guide. RESULTS 143 studies on sexual dimorphism based on dental tissue traits were included, of which 40.6% (n = 58) were done in Asia and 27.2% (n = 39) in America. 80% of the studies (equivalent to 114 articles) focused their observations and measurements on the dental crown; 4.2% in enamel, dentin, and pulp together; 3.5% in dental pulp; 2.1% in the entire tooth; 2.8% in enamel, root, and the enamel-cementum junction, and only 0.7% in dentin and pulp. In addition, 92.3% of the studies used metric methods, while only 4.9% and 2.8% used biochemical and non-metric method respectively. CONCLUSION For sexual dimorphism establishment, enamel has been the most analyzed dental tissue in permanent canines and molars mainly. Likewise, the most widely and accurately used methods for this purpose are the metrics, with the odontometry as the most implemented (intraoral or by using dental plaster models, digital scanning or software) with prediction percentages ranging from 51% to 95.9%. In contrast to biochemical methods, that can achieve the highest precision (up to 100%), the non-metric methods, to a less extent, reported prediction percentages of 58%.
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Affiliation(s)
- Tatiana M Herrera-Escudero
- Grupo Estudios Biosociales del Cuerpo, EBSC, Faculty of Dentistry, University of Antioquia, Medellín, Colombia.
| | - David Arboleda Toro
- Grupo Estudios Biosociales del Cuerpo, EBSC, Faculty of Dentistry, University of Antioquia, Medellín, Colombia
| | - Monica T Parada-Sanchez
- Grupo Estudios Biosociales del Cuerpo, EBSC, Faculty of Dentistry, University of Antioquia, Medellín, Colombia
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Puengpaiboon U, Rattanapan N, Pasam VK, Sukjamsri C. Finite Element Analysis of Anterior Implant-Supported Restorations with Different CAD-CAM Restorative Materials. Eur J Dent 2024. [PMID: 38744334 DOI: 10.1055/s-0044-1785532] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/16/2024] Open
Abstract
OBJECTIVES Due to the lack of literature concerning the selection of crown materials for the restoration of anterior teeth, this study aimed to investigate the effects of six distinct computer-aided design and computer-aided manufacturing (CAD-CAM) crown materials on stress and strain distribution within implant-supported maxillary central incisor restorations, employing finite element analysis (FEA). Furthermore, a comparative analysis was conducted between models that incorporated adjacent natural teeth and those that did not, intending to guide the selection of the most suitable modeling approach. MATERIALS AND METHODS Crown materials, including Lava Ultimate, Enamic, Emax CAD, Suprinity, Celtra Duo, and Cercon xt ML, were the subjects of the investigation. FEA models incorporating Coulomb friction were developed. These models were subjected to an oblique load, simulating the average maximum bite force experienced by anterior teeth. The potential for failure in titanium implant components and the prosthesis crown was evaluated through von Mises and principal stress, respectively. Furthermore, the failure of crestal bone was assessed through principal strain values. STATISTICAL ANALYSIS Stress values for each implant component and strain values of the bone were extracted from the models. To assess the impact of the six groups of crown materials, Kruskal-Wallis analysis of variance and post-hoc comparisons were conducted. Additionally, a statistical comparison between the two groups with Lava Ultimate and Cercon xt ML was performed using the Mann-Whitney U test to determine the difference in the two modeling approaches. RESULTS Higher crown material stiffness led to decreased stress in the abutment, fixture, and retaining screw, along with reduced strain in the surrounding bone. However, the decrease in stress and strain values became less significant with increasing crown stiffness. Additionally, the model with adjacent teeth showed significantly lower stress and strain concentrations compared to the model without adjacent teeth. CONCLUSION Crowns with a high elastic modulus were the optimal choice for anterior teeth restoration. Constructing FEA models with adjacent teeth was highly recommended to gain a deeper understanding of the mechanical behavior of dental implant restorations.
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Affiliation(s)
- Usanee Puengpaiboon
- Department of General Dentistry, Faculty of Dentistry, Srinakharinwirot University, Bangkok, Thailand
| | - Nichapat Rattanapan
- Department of Biomedical Engineering, Faculty of Engineering, Srinakharinwirot University, Nakhon Nayok, Thailand
| | - Vamsi Krishna Pasam
- Department of Mechanical Engineering, National Institute of Technology Warangal, Warangal, Telangana, India
| | - Chamaiporn Sukjamsri
- Department of Biomedical Engineering, Faculty of Engineering, Srinakharinwirot University, Nakhon Nayok, Thailand
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Przydzimirski AC, Maciel JVB, Luiz GC, Lange RR. Evaluation of Dental Enamel Thickness in Maxillary Teeth of Alouatta guariba clamitans, Alouatta caraya, and Sapajus nigritus by Cone Beam Computed Tomography. J Vet Dent 2024; 41:197-209. [PMID: 37401331 DOI: 10.1177/08987564231184330] [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] [Indexed: 07/05/2023]
Abstract
Tooth enamel thickness is widely studied in primates and is important in differentiating taxa and in interpreting diet and feeding behavior. The objective of this study was to measure enamel thickness and discuss whether the results can be associated with different feeding patterns. Thirty-four syncraniums of Alouatta guariba clamitans, Alouatta caraya, and Sapajus nigritus were subjected to cone beam computed tomographic (CBCT) scans, and the dental enamel was measured in different regions of the crown using the multiplanar reconstruction tool. The differences observed indicate that for many variables and teeth, A. guariba clamitans showed significantly higher values compared to the other 2 species, with the exception of the cuspid region. Although the A. guariba clamitans is a folivorous species, it showed thicker enamel for most of the variables. CBCT was efficient in performing the measurements, allowing analysis of the syncraniums.
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Affiliation(s)
- Andreise C Przydzimirski
- Postgraduate Program in Veterinary Sciences of the Federal University of Parana (UFPR), Curitiba, Parana, Brazil
| | - José V B Maciel
- Postgraduate Program in Dentistry of the Federal University of Parana (UFPR), Curitiba, Parana, Brazil
| | - Gabriela C Luiz
- Veterinary Medicine at the Federal University of Parana (UFPR), Curitiba, Parana, Brazil
| | - Rogério R Lange
- Postgraduate Program in Veterinary Sciences of the Federal University of Parana (UFPR), Curitiba, Parana, Brazil
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García-Campos C, Yacobi Izquierdo C, Modesto-Mata M, Martín-Francés L, Martínez de Pinillos M, Martinón-Torres M, Perea Perez B, Bermúdez de Castro JM, García-Martínez D. Sexual dimorphism in the enamel-dentine junction (EDJ) of permanent canines of European modern humans. AMERICAN JOURNAL OF BIOLOGICAL ANTHROPOLOGY 2024:e24913. [PMID: 38411322 DOI: 10.1002/ajpa.24913] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/14/2023] [Revised: 01/25/2024] [Accepted: 01/30/2024] [Indexed: 02/28/2024]
Abstract
OBJECTIVES Dental anthropological investigations into sexual dimorphism have conventionally concentrated on evaluating the dimensions and configuration of the enamel cap of canines. However, the morphology of the crown dentine surface can be closely linked to that of the enamel surface. This link can facilitate examination of crown morphology even when the enamel surface is slightly worn. Here, we determine if the morphology of the enamel-dentine junction (EDJ) differs within (maxillary vs. mandibular) and between a sample of male (n = 26) and female (n = 21) contemporary human permanent canines from Europe. METHODS The morphological data of the EDJ were gathered employing a template comprising 96 landmarks and sliding semilandmarks. Subsequently, the data underwent analysis through form space principal component analysis following Procrustes registration, utilizing standard 3D geometric morphometric techniques. RESULTS Significant differences in the morphology of the EDJ were observed between the sexes, particularly concerning the overall shape of the crown, the symmetry of the mesial and distal edges, and the development of the distal accessory ridge. CONCLUSIONS Sex differences in the morphology of the EDJ could relate in part to retention of the canine-premolar honing complex in males. Our results indicate that analyses of the permanent canine EDJ may potentially provide a novel method for estimating the sex of adult and nonadult skeletons.
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Affiliation(s)
- Cecilia García-Campos
- Centro Nacional de Investigación sobre la Evolución Humana, Burgos, Spain
- Universidad Autónoma de Madrid, Ciudad Universitaria de Cantoblanco, Madrid, Spain
| | - Cecilia Yacobi Izquierdo
- Universidad Autónoma de Madrid, Ciudad Universitaria de Cantoblanco, Madrid, Spain
- Physical Anthropology Unit, Department of Biodiversity, Ecology, and Evolution, Faculty of Biological Sciences, Complutense University of Madrid, Madrid, Spain
| | - Mario Modesto-Mata
- Centro Nacional de Investigación sobre la Evolución Humana, Burgos, Spain
- Universidad Internacional de La Rioja (UNIR), La Rioja, Spain
| | - Laura Martín-Francés
- Centro Nacional de Investigación sobre la Evolución Humana, Burgos, Spain
- Institut Català de Paleoecologia Humana i Evolució Social (IPHES), Tarragona, Spain
- Centro Mixto Universidad Complutense de Madrid - Instituto de Salud Carlos III de Evolución y Comportamiento Humanos, Madrid, Spain
| | - Marina Martínez de Pinillos
- Centro Nacional de Investigación sobre la Evolución Humana, Burgos, Spain
- Laboratorio de Evolución Humana (LEH), Universidad de Burgos, Burgos, Spain
| | - María Martinón-Torres
- Centro Nacional de Investigación sobre la Evolución Humana, Burgos, Spain
- Anthropology Department, University College London, London, UK
| | - Bernárdo Perea Perez
- Laboratorio de Antropología Forense, Escuela de Medicina Legal y Forense, Universidad Complutense de Madrid, Madrid, Spain
| | - José María Bermúdez de Castro
- Centro Nacional de Investigación sobre la Evolución Humana, Burgos, Spain
- Laboratorio de Evolución Humana (LEH), Universidad de Burgos, Burgos, Spain
| | - Daniel García-Martínez
- Centro Nacional de Investigación sobre la Evolución Humana, Burgos, Spain
- Physical Anthropology Unit, Department of Biodiversity, Ecology, and Evolution, Faculty of Biological Sciences, Complutense University of Madrid, Madrid, Spain
- Laboratory of Forensic Anthropology, Centre for Functional Ecology, Department of Life Sciences, University of Coimbra, Coimbra, Portugal
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Dalla-Nora F, Da Rosa LS, Pereira GKR, Valandro LF, Rippe MP. Is dentin analogue material a viable substitute for human dentin in fatigue behavior studies? J Mech Behav Biomed Mater 2024; 150:106312. [PMID: 38134583 DOI: 10.1016/j.jmbbm.2023.106312] [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: 10/30/2023] [Revised: 12/04/2023] [Accepted: 12/07/2023] [Indexed: 12/24/2023]
Abstract
This study aimed to compare the fatigue performance of a lithium disilicate ceramic cemented on different substrates (human dentin and glass fiber-reinforced epoxy resin - GFRER), treated with different types of conditioning (CTR - without surface conditioning; HF5 - 5% hydrofluoric acid; HF10 - 10% hydrofluoric acid; H3PO4 - phosphoric acid 37%; SAND - sandblasting with aluminum oxide). The occlusal surface of human molars (DENT group) (n = 15) was ground for dentin exposure and the root portion was cut, then the dentin slice (2.0 mm thick) was conditioned with 37% phosphoric acid and a dual-curing dental adhesive was applied. The GFRER in a round-rod format was cut into discs (Ø = 10 mm, 2.0 mm thick). Lithium disilicate glass ceramic blocks (IPS e.max CAD, Ivoclar, Schaan, Liechtenstein) were shaped into a cylinder format and cut, resulting in 90 discs (Ø = 10 mm, 1.5 mm thick). The substrate materials of each group were etched according to the groups and the ceramic was etched with 5% hydrofluoric acid for 30 s. A silane coupling agent was applied over the cementation surface in ceramic and GFRER surfaces and a dual cement was used for cementation (ceramic/GFRER or dentin). The disc/disc sets were submitted to thermocycling (25,000 cycles + storage for 6 months), and then tested in step-wise accelerated cyclic fatigue test. The failure pattern and topography were analyzed and the roughness and contact angle were measured before and after surface treatment. The DENT group presented the lowest load to failure values and number of cycles to failure in fatigue (637.33 N; 118.333), showing no statistical similarity with any of the other tested groups (p < 0.05). The topographic analysis showed that all proposed surface treatments modified the substrate surface when compared to the CTR group. All of the fractographical inspections demonstrated failure by radial crack. Considering the roughness analysis, the post-etched DENT group showed similar roughness to all groups of GFRER materials with their surface treated, except for SAND, which showed greater roughness and statistically different from the other groups. The DENT group (49.5) showed statistically different post-conditioning contact angle values from the HF10 group (96.5) and similar to the other groups. The glass fiber-reinforced epoxy resin was not able to simulate the results presented by the human dentin substrate when cemented to lithium disilicate regarding fatigue failure load and number of cycles for failure, regardless of the surface treatment. Lithium disilicate cemented on dentin analogue overestimates the load values for fatigue failure.
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Affiliation(s)
- F Dalla-Nora
- MSciD and PhD Post-Graduate Program in Oral Science [Prosthodontics Units], Faculty of Dentistry, Federal University of Santa Maria [UFSM], Avenue Roraima 1000, Building 26F, room 2383, Zip Code: 97105-900, Santa Maria, Rio Grande do Sul State, Brazil.
| | - L S Da Rosa
- MSciD and PhD Post-Graduate Program in Oral Science [Prosthodontics Units], Faculty of Dentistry, Federal University of Santa Maria [UFSM], Avenue Roraima 1000, Building 26F, room 2383, Zip Code: 97105-900, Santa Maria, Rio Grande do Sul State, Brazil.
| | - G K R Pereira
- MSciD and PhD Post-Graduate Program in Oral Science [Prosthodontics Units], Faculty of Dentistry, Federal University of Santa Maria [UFSM], Avenue Roraima 1000, Building 26F, room 2383, Zip Code: 97105-900, Santa Maria, Rio Grande do Sul State, Brazil.
| | - L F Valandro
- MSciD and PhD Post-Graduate Program in Oral Science [Prosthodontics Units], Faculty of Dentistry, Federal University of Santa Maria [UFSM], Avenue Roraima 1000, Building 26F, room 2383, Zip Code: 97105-900, Santa Maria, Rio Grande do Sul State, Brazil.
| | - M P Rippe
- MSciD and PhD Post-Graduate Program in Oral Science [Prosthodontics Units], Faculty of Dentistry, Federal University of Santa Maria [UFSM], Avenue Roraima 1000, Building 26F, room 2383, Zip Code: 97105-900, Santa Maria, Rio Grande do Sul State, Brazil.
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Aragonez GC, Dalla-Nora F, Soares PM, Pereira GKR, Valandro LF, Dos Santos SS, Rippe MP. Load-bearing capacity under fatigue of bonded-yttria tetragonal zirconia polycrystals and -yttria-stabilized zirconia: Effects of the viscosity of a dual-cured resin cement. J Mech Behav Biomed Mater 2023; 148:106233. [PMID: 37976685 DOI: 10.1016/j.jmbbm.2023.106233] [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: 10/04/2023] [Revised: 11/04/2023] [Accepted: 11/07/2023] [Indexed: 11/19/2023]
Abstract
This study aimed to evaluate the effect of low and high viscosities of dual-cured resin cement on the mechanical fatigue behavior of yttria tetragonal zirconia polycrystals (3Y-TZP) and yttria-stabilized zirconia (4YSZ) adhesively luted to a dentin analogue (glass fiber-reinforced epoxy resin). Ceramic discs were randomly divided into four groups (n = 20) based on the following study factors: dual-cured resin cement viscosities (low and high) and zirconia microstructure (3Y-TZP and 4YSZ). The discs were treated by air abrasion with aluminum oxide particles (50 μm), followed by the application of primer, and then luted with high or low viscosity resin cement to the dentin analogue. Subsequently, the luted sets underwent a step-stress fatigue test, which involved an initial load of 200 N, step increments of 100 N, 10,000 cycles per step, and a frequency of 20 Hz. Data on fatigue failure load (FFL) and the number of cycles for failure (CFF) were collected and analyzed using survival tests, including Kaplan-Meier and Mantel-Cox analyses, as well as Weibull analysis. Additionally, topography analysis, fractographic features, bonding interface analysis, and Raman spectroscopy were performed. The results revealed that 3Y-TZP exhibited superior fatigue behavior compared to 4YSZ, regardless of the viscosity of the resin cement used for luting. Among all groups, 3Y-Low exhibited the best fatigue performance, while 4YSZ luted with low or high viscosity resin cements yielded the lowest fatigue behavior (FFL). There were no significant differences in Weibull modulus among the groups. After air abrasion, both ceramics showed similar topography. Raman analysis indicated that the surface of 3Y-TZP ceramics prior to sintering had a monoclinic phase, which transitioned predominantly to tetragonal phase peaks after sintering. A similar transition was observed in 4YSZ ceramics. In summary, 3Y-TZP exhibited superior mechanical fatigue behavior compared to 4YSZ. The influence of resin cement viscosity on fatigue behavior was more pronounced in 3Y-TZP, with low-viscosity resin cement enhancing its performance. However, the mechanical fatigue behavior of 4YSZ was less affected by the viscosity of the dual-cured resin cement, showing similar results with both low and high viscosities. In conclusion, 3Y-TZP demonstrated superior mechanical fatigue behavior compared to 4YSZ. The impact of resin cement viscosity on fatigue behavior was more pronounced in 3Y-TZP, with low-viscosity resin cement enhancing its performance. Conversely, the mechanical fatigue behavior of 4YSZ was less sensitive to the viscosity of the dual-cured resin cement, resulting in similar outcomes with both low and high viscosities.
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Affiliation(s)
- Gabriela Carrão Aragonez
- MSciD and PhD Post-Graduate Program in Oral Science, Faculty of Odontology, Federal University of Santa Maria (UFSM), Santa Maria, Rio Grande do Sul State, Brazil.
| | - Fernanda Dalla-Nora
- MSciD and PhD Post-Graduate Program in Oral Science, Faculty of Odontology, Federal University of Santa Maria (UFSM), Santa Maria, Rio Grande do Sul State, Brazil.
| | - Pablo Machado Soares
- MSciD and PhD Post-Graduate Program in Oral Science, Faculty of Odontology, Federal University of Santa Maria (UFSM), Santa Maria, Rio Grande do Sul State, Brazil.
| | - Gabriel Kalil Rocha Pereira
- MSciD and PhD Post-Graduate Program in Oral Science, Faculty of Odontology, Federal University of Santa Maria (UFSM), Santa Maria, Rio Grande do Sul State, Brazil.
| | - Luiz Felipe Valandro
- MSciD and PhD Post-Graduate Program in Oral Science, Faculty of Odontology, Federal University of Santa Maria (UFSM), Santa Maria, Rio Grande do Sul State, Brazil.
| | - Sailer Santos Dos Santos
- Laboratory of Inorganic Materials, Department of Chemistry, Federal University of Santa Maria (UFSM), Santa Maria, Rio Grande do Sul State, Brazil.
| | - Marília Pivetta Rippe
- MSciD and PhD Post-Graduate Program in Oral Science, Faculty of Odontology, Federal University of Santa Maria (UFSM), Santa Maria, Rio Grande do Sul State, Brazil.
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Guilardi LF, Pereira G, Giordani JC, Kleverlaan CJ, Valandro LF, Rippe MP. Cement Choice and the Fatigue Performance of Monolithic Zirconia Restorations. Oper Dent 2022; 47:461-472. [PMID: 35917240 DOI: 10.2341/20-143-l] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/21/2021] [Indexed: 11/23/2022]
Abstract
This study investigated the fatigue failure load of simplified monolithic yttria partially stabilized zirconia polycrystal restorations cemented to a dentin-like substrate using different luting systems. Disc-shaped ceramic (Zenostar T, 10 mm Ø × 0.7 mm thick) and dentin-like substrate (10 mm Ø × 2.8 mm thick) were produced and randomly allocated into eight groups, without or with thermocycling (TC=5-55°C/12,000×): "cement" (RelyX Luting 2 - glass ionomer cement [Ion], [Ion/TC]; RelyX U200 - self-adhesive resin cement [Self], [Self/TC]; Single Bond Universal+RelyX Ultimate - MDP-containing adhesive + resin cement [MDPAD + RC], [MDP-AD + RC/TC]; ED Primer II+Panavia F 2.0 - Primer + MDP-containing resin cement [PR + MDP-RC], [PR + MDP-RC/TC])). Each luting system was used as recommended by the manufacturer. Staircase methodology (20 Hz; 250,000 cycles) was applied for obtaining the fatigue failure loads. Fractographic characteristics were also assessed. At baseline, the Ion group presented the lowest fatigue load, although it was statistically similar to the Self group. The resin-based cement systems presented the highest fatigue performance, with the Ion group being only statistically equal to the Self group. Thermocycling influenced the groups differently. After aging, the MDP-AD + RC presented the highest mean, followed by the PR + MDP-RC and Self groups, while the Ion group had the lowest mean. Fractographic analysis depicted all failures as radial cracks starting at the zirconia intaglio surface. The luting system with MDP-containing adhesive applied prior to the resin cement presented the highest fatigue failure load after aging, presenting the best predictability of stable performance. Despite this, monolithic zirconia presents high load-bearing capability regardless of the luting agent.
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Affiliation(s)
- L F Guilardi
- Luis Felipe Guilardi, associate researcher, Post-Graduate Program in Oral Science (Prosthodontics Unit), Faculty of Dentistry, Federal University of Santa Maria (UFSM), Santa Maria, Rio Grande do Sul State, Brazil
| | - Gkr Pereira
- Gabriel Kalil Rocha Pereira, MsciD, PhD, adjunct professor, Post-Graduate Program in Oral Science (Prosthodontics Units), Faculty of Dentistry, Federal University of Santa Maria (UFSM), Santa Maria, Rio Grande do Sul State, Brazil
| | - J C Giordani
- João Carlos Giordani, undergraduate student, Faculty of Dentistry, Federal University of Santa Maria (UFSM), Santa Maria, Rio Grande do Sul State, Brazil
| | - C J Kleverlaan
- Cornelis Johannes Kleverlaan, PhD, full professor, Department of Dental Materials Science, Academic Centre for Dentistry Amsterdam, Universiteit van Amsterdam and Vrije Universiteit, Amsterdam, Noord-Holland, The Netherlands
| | - L F Valandro
- Luiz Felipe Valandro, MSciD, PhD, full professor, Post-Graduate Program in Oral Science (Prosthodontics Units), Faculty of Dentistry, Federal University of Santa Maria (UFSM), Santa Maria, Rio Grande do Sul State, Brazil
| | - M P Rippe
- *Marilia Pivetta Rippe, MSciD, PhD, adjunct professor, Post-Graduate Program in Oral Science (Prosthodontics Units), Faculty of Dentistry, Federal University of Santa Maria (UFSM), Santa Maria, Rio Grande do Sul State, Brazil
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Kailasam V, Rangarajan H, Easwaran HN, Muthu MS. Proximal enamel thickness of the permanent teeth: A systematic review and meta-analysis. Am J Orthod Dentofacial Orthop 2021; 160:793-804.e3. [PMID: 34420845 DOI: 10.1016/j.ajodo.2021.05.007] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2020] [Revised: 05/01/2021] [Accepted: 05/01/2021] [Indexed: 10/20/2022]
Abstract
INTRODUCTION This systematic review aimed to identify, evaluate, and provide a synthesis of the available literature on the proximal enamel thickness (PET) of permanent teeth. METHODS The eligibility criteria were studies that assessed the PET of the permanent teeth. A search of studies in Medline (via PubMed), the Cochrane Library, Scopus, Web of Science, Embase, and Lilacs databases that measured PET was conducted until August 31, 2020. Two reviewers independently selected the studies, extracted the data, and assessed the risk of bias for systematic reviews involving cross-sectional studies. The quality of evidence was assessed using the Grading of Recommendations, Assessment, Development, and Evaluations approach. PET data generated from the systematic review were summarized by random-effects inverse-generic meta-analysis. RESULTS From 1388 potentially eligible studies, 11 were considered for systematic review and meta-analysis. The measurement of PET was done with radiographs, microscopes, microtomographs, or profilometers. In total, 4019 mesial and distal surfaces involving 2118 teeth were assessed. All included studies showed low to moderate risk of bias, whereas GRADE revealed that the level of evidence was low. Greater mesial and distal enamel thickness was observed for the premolars and molars, whereas it was least for the mandibular central incisors. The least difference of 0.02 mm (95% confidence interval [CI], -0.07 to 0.11 and -0.06 to 0.09, respectively) between mesial and distal sides was observed for the maxillary and mandibular second molars, whereas the maximum difference of 0.12 mm (95% CI, 0.07-0.17 and 0.07-0.16, respectively) was observed for the maxillary central incisors and maxillary first premolars. The meta-analysis indicated a moderate level of heterogeneity (I2 of 45%). The funnel plot revealed minimal publication bias. CONCLUSIONS The summary effect of the meta-analysis revealed that the thickness of the enamel on the distal aspect was greater than on the mesial aspect by an average of 0.10 mm (95% CI, 0.09-0.12). This finding would be of relevance to all disciplines of dentistry and especially for the clinician planning interproximal reduction, a procedure that is routinely done for clear aligner therapy.
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Affiliation(s)
- Vignesh Kailasam
- Department of Orthodontics, Sri Ramachandra Faculty of Dental Sciences, Sri Ramachandra Institute of Higher Education and Research, Chennai, India.
| | - Hita Rangarajan
- Department of Orthodontics, Sri Ramachandra Faculty of Dental Sciences, Sri Ramachandra Institute of Higher Education and Research, Chennai, India
| | - Harshini Nivetha Easwaran
- Centre for Early Childhood Caries Research (CECCRe), Department of Pediatric and Preventive Dentistry, Sri Ramachandra Faculty of Dental Sciences, Sri Ramachandra Institute of Higher Education and Research, Chennai, India
| | - M S Muthu
- Centre for Early Childhood Caries Research (CECCRe), Department of Pediatric and Preventive Dentistry, Sri Ramachandra Faculty of Dental Sciences, Sri Ramachandra Institute of Higher Education and Research, Chennai, India; Adjunct Research Associate, Centre of Medical and Bio-Allied Health Sciences Research, Ajman University, Ajman, United Arab Emirates
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Dalla-Nora F, Guilardi LF, Zucuni CP, Valandro LF, Rippe MP. Fatigue Behavior of Monolithic Zirconia-Reinforced Lithium Silicate Ceramic Restorations: Effects of Conditionings of the Intaglio Surface and the Resin Cements. Oper Dent 2021; 46:316-326. [PMID: 34251409 DOI: 10.2341/20-025-l] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/12/2020] [Indexed: 11/23/2022]
Abstract
OBJECTIVE This study assessed the effect of conditioning of the intaglio surface and resin cements on the fatigue behavior of zirconia-reinforced lithium silicate ceramic (ZLS) restorations cemented to a dentin analogue. METHODS ZLS ceramic (Ø=10 mm, thickness=1.5 mm) and dentin analogue (Ø=10 mm, thickness=2.0 mm) discs were produced and allocated according to the study factors, totaling nine study groups: ceramic surface treatment (three levels: hydrofluoric acid etching [HF]; self-etching ceramic primer [EP]; tribochemical silica coating [TBS]) and resin cement (three levels: 10-methacryloyloxydecyl dihydrogen phosphate [nMDP]; MDP-containing conventional resin cement [MDP]; self-adhesive resin cement [SA]). The ceramic bonding surfaces were treated and cemented on the dentin analogue, and all the specimens were aged for 5000 thermal cycles (5°C-55°C) prior to fatigue testing. The stepwise fatigue test (20 Hz frequency) started with a load of 400 N (5000 cycles) followed by steps of 500, 600, and up to 1800 N (step-size: 100 N) at a maximum of 10,000 cycles each step. The specimens were loaded until failure (crack), which was detected by light transillumination and visual inspection at the end of each step. The fatigue failure load and number of cycles for failure data were analyzed by the Kaplan-Meier (log-rank test; α=0.05). Topographic and fractographic analyses were also performed. RESULTS HF- (973.33-1206.67 N) and EP- (866.67-1066.67 N) treated specimens failed at statistically similar loads and higher than TBS (546.67-733.33 N), regardless of the cement used. All the fractographical inspections demonstrated failure as radial crack. CONCLUSION The HF and EP treatments promoted better mechanical fatigue behavior of the ceramic restoration, while tribochemical silica coating induced worse fatigue results and should be avoided for treating the ZLS surface prior to bonding.
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Mello-Gentil T, Souza-Mello V. Contributions of anatomy to forensic sex estimation: focus on head and neck bones. Forensic Sci Res 2021; 7:11-23. [PMID: 35341126 PMCID: PMC8942509 DOI: 10.1080/20961790.2021.1889136] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/03/2022] Open
Abstract
This study sought to provide an up-to-date review of the importance of anatomy to human identification, focusing on the usefulness of anatomical knowledge about the head and neck bones and teeth to sex estimation in routine forensic anthropology methods. A detailed search of osteology applications in forensic sex estimation was conducted through the electronic databases for the 10 years prior to July 2020. Relevant articles and classic literature on the subject were gathered and are outlined in this review. Among the available literature, several metric analyses showed accuracy superior to 80% in sexual diagnosis. Angles measured from the inclination of glabellae and analysis of the external frontal bone surface through three-dimensional computer-aided design emerge as reliable cranial indexes for sex estimation. In the mandible, the condylar and coronoid height, bigonial width, and coronion–gonion distance express significant sexual dimorphism. Measurements of the canine are the best option for sex estimation using teeth, as well as the thickness of the dentine or enamel of incisors. The axis vertebra surpasses other neck bones for sex estimation due to its atypical shape and the presence of the odontoid process. Metric analyses based on anatomy can provide reliable accuracy in sexual diagnosis. Adequate training and anatomical knowledge can reduce bias and interobserver differences, and the use of three-dimensional models and computed tomography images can enhance the accuracy of these methods for sex estimation. However, every method should be validated before being applied to a different population.
Key Points • Anatomy-based metric analyses can provide reliable accuracy in forensic sex estimation.
• Glabellae inclination, external frontal bone surface, mandible, and canine teeth measurements can reach accuracies superior to 80% in sexual diagnosis. • The use of three-dimensional models and computed tomography images can enhance accuracy in sex estimation. • Every method should be validated before being applied to a different population.
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Affiliation(s)
| | - Vanessa Souza-Mello
- Department of Anatomy, Rio de Janeiro State University, Rio de Janeiro, Brazil
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Abstract
The difficulty in obtaining human teeth that are caries-free that have similar environmental exposure, e.g., diet intake and water fluoridation has lead researchers to opt for bovine teeth as a substitute for erosion studies. Bovine mandibular incisors are readily available at abattoirs and often originate from the same region and are likely to consume similar dietary intake. The bovine teeth for erosion or abrasion studies usually undergo specimen preparation to produce a "flat surface" baseline specimen. Among other terms used to define baseline specimens for erosion and abrasion studies include phrases like "optically flat" and "flat and smooth surface." However, these terms might have no quantitative value as it does not justify the actual surface characteristics of the prepared flattened surface. In dentistry, roughness average (Ra) is the most commonly used parameter when reporting the roughness of specimens Reporting Ra alone might not be sufficient as it does not provide information regarding the surface texture as there is no distinction between valleys and peaks, nor does it provide information about the core structure of a material unlike the bearing area curve. The incorporation of Ra and BAP values in baseline specimens has the potential in predicting the wear or lubricating potential of these specimens. Furthermore, standardization of baseline specimens by acknowledging its surface roughness values ensures comparability of erosion and abrasion studies as different specimen preparation technique might influence the outcome or results of research.
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Affiliation(s)
- Hayati Ishak
- Centre of Comprehensive Care Studies, Faculty of Dentistry, Universiti Teknologi MARA, Selangor, Malaysia
| | - James Field
- Department of Restorative Dentistry School of Dentistry, Cardiff University, Cardiff, United Kingdom
| | - Matthew German
- School of Dental Sciences, Translational and Clinical Research Institute, Newcastle University, Newcastle, United Kingdom
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Fernée C, Zakrzewski S, Robson Brown K. Dimorphism in dental tissues: Sex differences in archaeological individuals for multiple tooth types. AMERICAN JOURNAL OF PHYSICAL ANTHROPOLOGY 2020; 175:106-127. [PMID: 33247477 DOI: 10.1002/ajpa.24174] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/28/2020] [Revised: 10/29/2020] [Accepted: 11/04/2020] [Indexed: 12/29/2022]
Abstract
OBJECTIVES Dimorphism in the dentition has been observed in human populations worldwide. However, research has largely focused on traditional linear crown measurements. As imaging systems, such as micro-computed tomography (micro-CT), become increasingly more accessible, new dental measurements such as dental tissue size and proportions can be obtained. This research investigates the variation of dental tissues and proportions by sex in archaeological samples. MATERIALS AND METHODS Upper and lower first incisor to second premolar tooth rows were obtained from 30 individuals (n = 300), from 3 archaeological samples. The teeth were micro-CT scanned and surface area and volumetric measurements were obtained from the surface meshes extracted. Dental wear was also recorded and differences between sexes determined. RESULTS Enamel and crown measurements were found to be larger in females. Conversely, dentine and root measurements were larger in males. DISCUSSION The findings support the potential use of dental tissues to estimate sex of individuals from archaeological samples, while also indicating that individuals aged using current dental aging methods may be underaged or overaged due to sex differences in enamel thickness.
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Affiliation(s)
- Christianne Fernée
- Department of Anthropology and Archaeology, University of Bristol, Bristol, UK.,Department of Archaeology, University of Southampton, Southampton, UK
| | - Sonia Zakrzewski
- Department of Archaeology, University of Southampton, Southampton, UK
| | - Kate Robson Brown
- Department of Anthropology and Archaeology, University of Bristol, Bristol, UK
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García-Campos C, Modesto-Mata M, Martinón-Torres M, Martínez de Pinillos M, Martín-Francés L, Arsuaga JL, Bermúdez de Castro JM. Sexual dimorphism of the enamel and dentine dimensions of the permanent canines of the Middle Pleistocene hominins from Sima de los Huesos (Burgos, Spain). J Hum Evol 2020; 144:102793. [PMID: 32442650 DOI: 10.1016/j.jhevol.2020.102793] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2018] [Revised: 03/26/2020] [Accepted: 03/26/2020] [Indexed: 01/26/2023]
Abstract
Sexual dimorphism is an important component of the total variation seen in populations and plays a key role in taxonomic debates. In this study, microtomographic (microcomputed tomography) techniques were applied to a sample of hominin teeth from the Sima de los Huesos site (Spain). Dental tissue proportions of the permanent canines were assessed to characterize the pattern and degree of sexual dimorphism within this population. In addition, the possible similarities and differences with the Homo neanderthalensis remains from Krapina (Croatia) and with a recent modern human sample were evaluated. A combination of classical statistical approaches with more novel techniques allowed us not only to ratify the sex allocation of the individuals previously assigned in the literature but also to estimate the sex of the youngest individuals, which were not assessed in previous studies. Likewise, the sexes of certain extensively worn canines and isolated pieces were estimated. As a result, the sex ratio observed in our dental sample from the Sima de los Huesos population is 5:9 (Nm:Nf). In general terms, both Sima de los Huesos and Krapina dental samples have a degree of sexual dimorphism in their permanent canine tissue proportions that does not surpass that of modern humans. The marked dimorphic root volume of Sima de los Huesos mandibular canines is the exception, which surpasses the modern human mean, although it falls within the 95% confidence interval. Therefore, our results do not support that dental tissue proportions of the European Middle Pleistocene populations were more dimorphic than in modern humans. However, the differences in canine tissue proportions are great enough to allow sex estimation with a high degree of confidence.
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Affiliation(s)
- Cecilia García-Campos
- Centro Nacional de Investigación Sobre La Evolución Humana, Paseo de La Sierra de Atapuerca 3, 09002, Burgos, Spain; Anthropology Department, University College London, 14 Taviton Street, London, WC1H 0BW, UK.
| | - Mario Modesto-Mata
- Centro Nacional de Investigación Sobre La Evolución Humana, Paseo de La Sierra de Atapuerca 3, 09002, Burgos, Spain; Anthropology Department, University College London, 14 Taviton Street, London, WC1H 0BW, UK
| | - María Martinón-Torres
- Centro Nacional de Investigación Sobre La Evolución Humana, Paseo de La Sierra de Atapuerca 3, 09002, Burgos, Spain; Anthropology Department, University College London, 14 Taviton Street, London, WC1H 0BW, UK
| | - Marina Martínez de Pinillos
- Centro Nacional de Investigación Sobre La Evolución Humana, Paseo de La Sierra de Atapuerca 3, 09002, Burgos, Spain; Anthropology Department, University College London, 14 Taviton Street, London, WC1H 0BW, UK
| | - Laura Martín-Francés
- Centro Nacional de Investigación Sobre La Evolución Humana, Paseo de La Sierra de Atapuerca 3, 09002, Burgos, Spain; Anthropology Department, University College London, 14 Taviton Street, London, WC1H 0BW, UK; Université de Bordeaux, CNRS, MCC, PACEA, UMR 5199, F-33615, Pessac Cedex, France
| | - Juan Luis Arsuaga
- Centro Mixto UCM-ISCIII de Evolución y Comportamiento Humanos, Madrid, Spain
| | - José María Bermúdez de Castro
- Centro Nacional de Investigación Sobre La Evolución Humana, Paseo de La Sierra de Atapuerca 3, 09002, Burgos, Spain; Anthropology Department, University College London, 14 Taviton Street, London, WC1H 0BW, UK
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Li K, Yang Z, Liang W, Shang J, Liang Y, Wan S. Low-cost, ultracompact handheld optical coherence tomography probe for in vivo oral maxillofacial tissue imaging. JOURNAL OF BIOMEDICAL OPTICS 2020; 25:1-13. [PMID: 32314560 PMCID: PMC7167599 DOI: 10.1117/1.jbo.25.4.046003] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/10/2019] [Accepted: 04/01/2020] [Indexed: 05/13/2023]
Abstract
SIGNIFICANCE Optical coherence tomography (OCT) has proven useful for detecting various oral maxillofacial abnormalities. To apply it to clinical applications including biopsy guidance and routine screening, a handheld imaging probe is indispensable. OCT probes reported for oral maxillofacial imaging were either based on a bulky galvanometric mirror pair (not compact or long enough) or a distal-end microelectromechanical systems (MEMS) scanner (raised safety concerns), or adapted from fiber-optic catheters (ill-suited for oral cavity geometry). AIM To develop a handheld probe featuring great compactness and excellent maneuverability for oral maxillofacial tissue imaging. APPROACH A dual-axis MEMS scanner was deployed at the proximal end of the probe and the scanned beam was relayed to the distal end through a 4f configuration. Such design provides both a perfect dual-axis telecentric scan and excellent compactness. RESULTS A handheld probe with a rigid part 70 mm in length and 7 mm in diameter and weighing 25 g in total was demonstrated through both ex vivo and in vivo experiments, including structural visualization of various oral maxillofacial tissues and monitoring the recovery process of an oral mucosa canker sore. CONCLUSIONS The proposed probe exhibits excellent maneuverability and imaging performance showing great potential in clinical applications.
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Affiliation(s)
- Kaiyan Li
- Southeast University, School of Biological Science and Medical Engineering, Nanjing, Jiangsu, China
| | - Zihan Yang
- Nankai University, Institute of Modern Optics, Tianjin, China
| | - Wenxuan Liang
- Columbia University, Mortimer B. Zuckerman Mind Brain Behavior Institute, New York, United States
| | - Jianwei Shang
- Nankai University, Tianjin Stomatological Hospital, Hospital of Stomatology, Department of Oral Pathology, Tianjin, China
| | - Yanmei Liang
- Nankai University, Institute of Modern Optics, Tianjin, China
- Address all correspondence to Yanmei Liang, E-mail: ; Suiren Wan, E-mail:
| | - Suiren Wan
- Southeast University, School of Biological Science and Medical Engineering, Nanjing, Jiangsu, China
- Address all correspondence to Yanmei Liang, E-mail: ; Suiren Wan, E-mail:
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Guilardi LF, Pereira GKR, Vallau AS, Silva IA, Giordani JC, Valandro LF, Rippe MP. Fatigue Failure Load of a Bonded Simplified Monolithic Feldspathic Ceramic: Influence of Hydrofluoric Acid Etching and Thermocycling. Oper Dent 2020; 45:E21-E31. [DOI: 10.2341/19-069-l] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
SUMMARY
Objective:
To evaluate the effect of hydrofluoric acid (HF) etching and thermocycling (Tc) on fatigue failure load of feldspathic ceramic restorations cemented with two resin cements.
Methods:
Disc-shaped feldspathic ceramic (Vitablocs Mark II; Ø=10 mm, 1.0-mm thick) and G10 epoxy resin (Ø=10 mm, 2.5-mm thick) specimens were made and randomly allocated considering three factors: ceramic etching (ie, with vs without 10% HF plus silane application), resin cement (ie, self-adhesive [RelyX U200; U200] or conventional [Multilink Automix; MA]), and Tc (ie, with vs without 5-55°C/12,000 cycles). Adhesive cementation followed each manufacturer's instructions. The fatigue test (n=20) was based on the staircase approach (250,000 cycles; 20 Hz). Contact angle, surface topography, and fractography analysis were also executed. Specific statistical tests were employed for each outcome (α=0.05).
Results:
The interaction of HF and Tc factors decreased the fatigue resistance for both cements (U200 542.63>U200/HF-Tc 495.00; MA 544.47>MA/HF-Tc 506.84). Comparing the cements associated with HF or Tc, there was statistical superiority for MA (U200-Tc 537.37<MA-Tc 561.32; U200/HF 535.79<MA/HF 557.11), and no statistical difference was detected when only cement type or its association with HF-Tc was compared (U200 542.63=MA 544.47; U200/HF-Tc 495.00=MA/HF-Tc 506.84). The fracture always originated from defects at the ceramic-intaglio surface as radial cracks.
Conclusion:
HF etching plus silane agent increased the ceramic surface free energy and its wettability, but it did not provide better results in terms of fatigue resistance compared with silane agent application only. The association of HF etching and aging significantly reduced the fatigue resistance of the material, regardless of the resin cement used.
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Affiliation(s)
- LF Guilardi
- Luís Felipe Guilardi, DDS, MSD, MSciD and PhD, Post-Graduate Program in Oral Sciences (Prosthodontics Units), School of Dentistry, Federal University of Santa Maria, Santa Maria, Rio Grande do Sul State, Brazil
| | - GKR Pereira
- Gabriel Kalil Rocha Pereira, DDS, MSciD, PhD, Division of Prosthodontics, Department of Restorative Dentistry, Federal University of Santa Maria, Santa Maria, Rio Grande do Sul State, Brazil
| | - AS Vallau
- Amanda da Silveira Vallau, DDS, Graduate Program in Dentistry, School of Dentistry, Federal University of Santa Maria (UFSM), Santa Maria, Rio Grande do Sul State, Brazil
| | - IA Silva
- Isadora Ames Silva, DDS, Graduate Program in Dentistry, School of Dentistry, Federal University of Santa Maria (UFSM), Santa Maria, Rio Grande do Sul State, Brazil
| | - JC Giordani
- João Carlos Giordani, DDS, Graduate Program in Dentistry, School of Dentistry, Federal University of Santa Maria (UFSM), Santa Maria, Rio Grande do Sul State, Brazil
| | - LF Valandro
- Luiz Felipe Valandro, DDS, MSciD, PhD, Division of Prosthodontics, Department of Restorative Dentistry, Federal University of Santa Maria, Santa Maria, Rio Grande do Sul State, Brazil
| | - MP Rippe
- Marília Pivetta Rippe, DDS, MSciD, PhD, Division of Prosthodontics, Department of Restorative Dentistry, Federal University of Santa Maria, Santa Maria, Rio Grande do Sul State, Brazil
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Guilardi LF, Pereira GKR, Giordani JC, Kleverlaan CJ, Valandro LF, Rippe MP. Effect of zirconia surface treatment, resin cement and aging on the load-bearing capacity under fatigue of thin simplified full-contour Y-TZP restorations. J Mech Behav Biomed Mater 2019; 97:21-29. [DOI: 10.1016/j.jmbbm.2019.04.050] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2019] [Revised: 04/24/2019] [Accepted: 04/26/2019] [Indexed: 10/26/2022]
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17
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García-Campos C, Martinón-Torres M, Martínez de Pinillos M, Modesto-Mata M, Martín-Francés L, Perea-Pérez B, Zanolli C, Bermúdez de Castro JM. Modern humans sex estimation through dental tissue patterns of maxillary canines. AMERICAN JOURNAL OF PHYSICAL ANTHROPOLOGY 2018; 167:914-923. [DOI: 10.1002/ajpa.23715] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/27/2018] [Revised: 09/05/2018] [Accepted: 09/11/2018] [Indexed: 11/08/2022]
Affiliation(s)
- Cecilia García-Campos
- Centro Nacional de Investigación sobre la Evolución Humana; Burgos Spain
- Anthropology Department; University College London; London United Kingdom
| | - María Martinón-Torres
- Centro Nacional de Investigación sobre la Evolución Humana; Burgos Spain
- Anthropology Department; University College London; London United Kingdom
| | - Marina Martínez de Pinillos
- Centro Nacional de Investigación sobre la Evolución Humana; Burgos Spain
- Anthropology Department; University College London; London United Kingdom
| | - Mario Modesto-Mata
- Centro Nacional de Investigación sobre la Evolución Humana; Burgos Spain
- Anthropology Department; University College London; London United Kingdom
- Equipo Primeros Pobladores de Extremadura; Casa de la Cultura Rodríguez Moñino; Cáceres Spain
| | - Laura Martín-Francés
- Université de Bordeaux, CNRS, MCC, PACEA, UMR 5199; Pessac Cedex France
- Centro Nacional de Investigación sobre la Evolución Humana; Burgos Spain
| | | | - Clément Zanolli
- UMR 5288 CNRS; University Toulouse III - Paul Sabatier; France
| | - José María Bermúdez de Castro
- Centro Nacional de Investigación sobre la Evolución Humana; Burgos Spain
- Anthropology Department; University College London; London United Kingdom
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López-Lázaro S, Alemán I, Viciano J, Irurita J, Botella MC. Sexual dimorphism of the first deciduous molar: A geometric morphometric approach. Forensic Sci Int 2018; 290:94-102. [DOI: 10.1016/j.forsciint.2018.06.036] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2018] [Revised: 06/19/2018] [Accepted: 06/26/2018] [Indexed: 10/28/2022]
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19
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Scherer MM, Prochnow C, Venturini AB, Pereira GKR, Burgo TADL, Rippe MP, Valandro LF. Fatigue failure load of an adhesively-cemented lithium disilicate glass-ceramic: Conventional ceramic etching vs etch & prime one-step primer. Dent Mater 2018; 34:1134-1143. [PMID: 29789162 DOI: 10.1016/j.dental.2018.04.012] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2018] [Revised: 04/13/2018] [Accepted: 04/30/2018] [Indexed: 11/26/2022]
Abstract
OBJECTIVES To evaluate the effect of different glass-ceramic surface treatments and aging on the fatigue failure load of a lithium disilicate glass-ceramic adhesively cemented to a dentin analogue material. METHODS One hundred and twenty (120) disc-shaped lithium disilicate specimens (Ø=10mm, thickness=1.5mm) were produced and randomly allocated (n=20) into 6 groups, considering 2 study factors: "surface treatment" in 3 levels (SIL-silane application only; HF5+SIL-5% hydrofluoric acid etching and silane application; ME&P-etching with an one-step ceramic primer), and "storage" in 2 levels (baseline-storage for 7 days; aging-storage for 90 days+12,000 thermal cycles). Ceramic discs were adhesively cemented to discs of a dentin analogue material (Ø=10mm, thickness=2.0mm) following the manufacturers' instructions. The fatigue failure load was determined by the staircase approach (250,000 cycles; 20Hz; initial load=1050N [∼70% of mean load-to-failure]; step size=52.5N [5% of initial load]). Micro-morphologic, fractographic, and atomic force microscope analysis were also performed. Fatigue failure load data were evaluated by one-way ANOVA, Bonferroni and t-tests for independent samples. RESULTS HF5+SIL presented higher fatigue failure load in both conditions (baseline and aging); ME&P presented intermediary mean values, while the SIL group presented the worst performance. All groups had a statistically significant decrease in the fatigue performance after aging. SIGNIFICANCE Hydrofluoric acid followed by silane application showed the best fatigue performance for an adhesively-cemented lithium disilicate ceramic. Aging negatively influenced the fatigue performance for all tested groups.
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Affiliation(s)
- Maitê Munhoz Scherer
- MSciD and PhD Post-Graduate Program in Oral Science (Prosthodontics Units), Faculty of Dentistry, Federal University of Santa Maria (UFSM), Marechal Floriano Peixoto Street, 1184, Centro, 97015372, Santa Maria, Rio Grande do Sul State, Brazil.
| | - Catina Prochnow
- MSciD and PhD Post-Graduate Program in Oral Science (Prosthodontics Units), Faculty of Dentistry, Federal University of Santa Maria (UFSM), Marechal Floriano Peixoto Street, 1184, Centro, 97015372, Santa Maria, Rio Grande do Sul State, Brazil.
| | - Andressa Borin Venturini
- MSciD and PhD Post-Graduate Program in Oral Science (Prosthodontics Units), Faculty of Dentistry, Federal University of Santa Maria (UFSM), Marechal Floriano Peixoto Street, 1184, Centro, 97015372, Santa Maria, Rio Grande do Sul State, Brazil.
| | - Gabriel Kalil Rocha Pereira
- MSciD and PhD Post-Graduate Program in Oral Science (Prosthodontics Units), Faculty of Dentistry, Federal University of Santa Maria (UFSM), Marechal Floriano Peixoto Street, 1184, Centro, 97015372, Santa Maria, Rio Grande do Sul State, Brazil; MSciD Graduate Program, School of Dentistry, Meridional Faculty-IMED, Senador Pinheiro Street, 304, Vila Rodrigues, 99070220, Passo Fundo, Rio Grande do Sul State, Brazil.
| | - Thiago Augusto de Lima Burgo
- Department of Physics, Federal University of Santa Maria (UFSM), Roraima Avenue, 1000, Camobi, 97105900, Santa Maria, Rio Grande do Sul State, Brazil.
| | - Marília Pivetta Rippe
- MSciD and PhD Post-Graduate Program in Oral Science (Prosthodontics Units), Faculty of Dentistry, Federal University of Santa Maria (UFSM), Marechal Floriano Peixoto Street, 1184, Centro, 97015372, Santa Maria, Rio Grande do Sul State, Brazil.
| | - Luiz Felipe Valandro
- MSciD and PhD Post-Graduate Program in Oral Science (Prosthodontics Units), Faculty of Dentistry, Federal University of Santa Maria (UFSM), Marechal Floriano Peixoto Street, 1184, Centro, 97015372, Santa Maria, Rio Grande do Sul State, Brazil.
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García‐Campos C, Martinón‐Torres M, Martín‐Francés L, Martínez de Pinillos M, Modesto‐Mata M, Perea‐Pérez B, Zanolli C, Labajo González E, Sánchez Sánchez JA, Ruiz Mediavilla E, Tuniz C, Bermúdez de Castro JM. Contribution of dental tissues to sex determination in modern human populations. AMERICAN JOURNAL OF PHYSICAL ANTHROPOLOGY 2018; 166:459-472. [DOI: 10.1002/ajpa.23447] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/01/2017] [Revised: 02/05/2018] [Accepted: 02/06/2018] [Indexed: 11/10/2022]
Affiliation(s)
- Cecilia García‐Campos
- Departamento de Paleobiología de Homínidos, Centro Nacional de Investigación sobre la Evolución HumanaPaseo de la Sierra de Atapuerca 3, Burgos09002 Spain
- Anthropology DepartmentUniversity College LondonLondonWC1H 0BW United Kingdom
| | - María Martinón‐Torres
- Departamento de Paleobiología de Homínidos, Centro Nacional de Investigación sobre la Evolución HumanaPaseo de la Sierra de Atapuerca 3, Burgos09002 Spain
- Anthropology DepartmentUniversity College LondonLondonWC1H 0BW United Kingdom
| | - Laura Martín‐Francés
- Departamento de Paleobiología de Homínidos, Centro Nacional de Investigación sobre la Evolución HumanaPaseo de la Sierra de Atapuerca 3, Burgos09002 Spain
- De la Préhistoire à l'Actuel : Culture, Environnement et Anthropologie, University of Bordeaux, CNRS, MCC, PACEA, UMR 5199 F_33615Pessac Cedex France
| | - Marina Martínez de Pinillos
- Departamento de Paleobiología de Homínidos, Centro Nacional de Investigación sobre la Evolución HumanaPaseo de la Sierra de Atapuerca 3, Burgos09002 Spain
- Anthropology DepartmentUniversity College LondonLondonWC1H 0BW United Kingdom
| | - Mario Modesto‐Mata
- Departamento de Paleobiología de Homínidos, Centro Nacional de Investigación sobre la Evolución HumanaPaseo de la Sierra de Atapuerca 3, Burgos09002 Spain
- Anthropology DepartmentUniversity College LondonLondonWC1H 0BW United Kingdom
- Equipo Primeros Pobladores de Extremadura, Casa de la Cultura Rodríguez MoñinoCáceres Spain
| | - Bernardo Perea‐Pérez
- Laboratorio de Antropología Forense, Escuela de Medicina Legal y ForenseUniversidad Complutense de Madrid Spain
| | - Clément Zanolli
- Laboratoire d'Anthropobiologie Moléculaire et d'Imagerie de Synthèse, UMR 5288 CNRS, University Toulouse III—Paul Sabatier France
| | - Elena Labajo González
- Laboratorio de Antropología Forense, Escuela de Medicina Legal y ForenseUniversidad Complutense de Madrid Spain
| | | | - Elena Ruiz Mediavilla
- Laboratorio de Antropología Forense, Escuela de Medicina Legal y ForenseUniversidad Complutense de Madrid Spain
| | - Claudio Tuniz
- Multidisciplinary Laboratory, International Centre for Theoretical Physics (ICTP) of TriesteTrieste Italy
| | - José María Bermúdez de Castro
- Departamento de Paleobiología de Homínidos, Centro Nacional de Investigación sobre la Evolución HumanaPaseo de la Sierra de Atapuerca 3, Burgos09002 Spain
- Anthropology DepartmentUniversity College LondonLondonWC1H 0BW United Kingdom
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Venturini AB, Prochnow C, Pereira GKR, Werner A, Kleverlaan CJ, Valandro LF. The effect of hydrofluoric acid concentration on the fatigue failure load of adhesively cemented feldspathic ceramic discs. Dent Mater 2018; 34:667-675. [PMID: 29397196 DOI: 10.1016/j.dental.2018.01.010] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2017] [Revised: 12/28/2017] [Accepted: 01/14/2018] [Indexed: 11/27/2022]
Abstract
OBJECTIVE This study investigated the influence of hydrofluoric acid (HF) etching at different concentrations on the fatigue failure load of adhesively cemented feldspathic ceramic discs (Vita Mark II). Besides, their effect on the micromorphology of ceramic surface was investigated. METHODS Eighty ceramic discs (ϕ=10 mm; thickness=1.5 mm) were cemented to epoxy supporting discs (ϕ=10 mm; thickness=2.0mm) using different surface conditioning methods (n=20): nonetched control (CTRL), or etched for 60s with different HF concentrations: 1% (HF1), 5% (HF5), or 10% (HF10). All the ceramic discs received a silane application (Monobond Plus). The epoxy discs were etched with 10% HF for 60s and received a primer coating (Multilink Primer A+B). Adhesively cementation was performed (Multilink Automix), and the assemblies (ceramic discs/epoxy discs) were subjected to cyclic loads in water by a staircase approach (500,000 cycles; 20Hz; initial load=290N; step size=30N). Fatigue failure load data were analyzed using 1-way ANOVA and post-hoc Tukey's tests (α=.05). RESULTS Mean failure load of the HF5 group (255.0±23.0N) was significantly lower; HF1 group (301.7±71.0N) presented intermediate values, and the highest values were achieved in CTRL (351.7±13.4N) and HF10 (341.7±20.6N) groups. All the failures were radial cracks starting from the bonding surface. SIGNIFICANCE In terms of fatigue failure load, etching with 1% and 5% HF had a deleterious effect on the fatigue behavior of an adhesively cemented feldspathic ceramic, while 10% HF had no negative influence.
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Affiliation(s)
- Andressa B Venturini
- Faculty of Odontology, Federal University of Santa Maria, Santa Maria, Rio Grande do Sul, Brazil.
| | - Catina Prochnow
- Faculty of Odontology, Federal University of Santa Maria, Santa Maria, Rio Grande do Sul, Brazil.
| | - Gabriel K R Pereira
- Faculty of Odontology, Federal University of Santa Maria, Santa Maria, Rio Grande do Sul, Brazil; School of Dentistry, Meridional Faculty - IMED, Passo Fundo, Rio Grande do Sul, Brazil.
| | - Arie Werner
- Department of Dental Materials Science, Academic Centre for Dentistry Amsterdam (ACTA), Universiteit van Amsterdam and Vrije Universiteit, Amsterdam, The Netherlands.
| | - Cornelis J Kleverlaan
- Department of Dental Materials Science, Academic Centre for Dentistry Amsterdam (ACTA), Universiteit van Amsterdam and Vrije Universiteit, Amsterdam, The Netherlands.
| | - Luiz Felipe Valandro
- Faculty of Odontology, Federal University of Santa Maria, Santa Maria, Rio Grande do Sul, Brazil.
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22
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Monalisa W, Kokila G, Sharma HD, Gopinathan PA, Singh OM, Kumaraswamy S. Sexual dimorphism of enamel area, coronal dentin area, bicervical diameter and dentinoenamel junction scallop area in longitudinal ground section. J Oral Maxillofac Pathol 2018; 22:423-429. [PMID: 30651693 PMCID: PMC6306578 DOI: 10.4103/jomfp.jomfp_182_18] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Abstract
Introduction: Sex determination plays an important role in forensics; several studies done using radiographs, model cast and animal teeth have shown that males possess larger tooth crown and more dentin than that of the females. As physical sectioning of tooth provides more accurate measurement of enamel thickness when compared with other methods, the present study was done to evaluate and compare enamel area (EA), coronal dentin area (CDA), bi-cervical diameter (BCD), average enamel thickness (AET) and dentinoenamel junction scallop area (DEJ-SA) in longitudinal ground sections of first premolars between males and females. Materials and Methods: A total of 60 extracted first premolar teeth were used for the study, of which 30 were from male and 30 were from female. A longitudinal ground section of 15 maxillary and 15 mandibular premolars of approximately 50 μm was prepared buccolingually at the center of each tooth and mounted on the slide. Multiple photomicrographs were captured with the help of Image Analysis System Software-Progres, Speed XT core 3. EA, CDA, length of the dentinoenamel junction and BCD were measured. Average DEJ-SA and AET were also calculated. Results: Mann–Whitney U- test was used for statistical analysis. It was found that EA and AET were significantly greater in females than in males. On the contrary, it was found that CDA was significantly greater in males than in females. However, no significant difference was found in BCD and DEJ-SA between males and females. Conclusion: Permanent first premolar can be reliably used in the field of forensic in establishing gender of individuals by measuring its EA, CDA and AET.
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Affiliation(s)
- Wakambam Monalisa
- Department of Oral Pathology and Microbiology, Dental College, Jawaharlal Nehru Institute of medical sciences, Porompat, Manipur, India
| | - Ganganna Kokila
- Department of Oral Pathology and Microbiology, Sri Siddhartha Dental College and Hospital, Sri Siddhartha Academy of Higher Education, Tumkuru, Karnataka, India
| | | | - Pillai Arun Gopinathan
- Department of Oral Pathology and Microbiology, Sri Sankara Dental College, Varkala, Kerala, India
| | | | - Shubha Kumaraswamy
- Department of Dentistry, Sridevi Institute of Medical Science and Research Hospital, Tumkuru, Karnataka, India
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de Kok P, Pereira GK, Fraga S, de Jager N, Venturini AB, Kleverlaan CJ. The effect of internal roughness and bonding on the fracture resistance and structural reliability of lithium disilicate ceramic. Dent Mater 2017; 33:1416-1425. [DOI: 10.1016/j.dental.2017.09.018] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2017] [Revised: 08/04/2017] [Accepted: 09/22/2017] [Indexed: 10/18/2022]
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24
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Umakoshi M, Yamaguchi I, Hirata H, Kunugita N, Williams BB, Swartz HM, Miyake M. In Vivo Electron Paramagnetic Resonance Tooth Dosimetry: Dependence of Radiation-Induced Signal Amplitude on the Enamel Thickness and Surface Area of Ex Vivo Human Teeth. HEALTH PHYSICS 2017; 113:262-270. [PMID: 28796750 DOI: 10.1097/hp.0000000000000698] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
In vivo L-band electron paramagnetic resonance tooth dosimetry is a newly developed and very promising method for retrospective biodosimetry in individuals who may have been exposed to significant levels of ionizing radiation. The present study aimed to determine the relationships among enamel thickness, enamel area, and measured electron paramagnetic resonance signal amplitude with a view to improve the quantitative accuracy of the dosimetry technique. Ten isolated incisors were irradiated using well-characterized doses, and their radiation-induced electron paramagnetic resonance signals were measured. Following the measurements, the enamel thickness and area of each tooth were measured using micro-focus computed tomography. Linear regression showed that the enamel area at each measurement position significantly affected the radiation-induced electron paramagnetic resonance signal amplitude (p < 0.001). Simulation data agreed well with this result. These results indicate that it is essential to properly consider enamel thickness and area when interpreting electron paramagnetic resonance tooth dosimetry measurements to optimize the accuracy of dose estimation.
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Affiliation(s)
- Michitaka Umakoshi
- *Department of Oral and Maxillofacial Surgery, Faculty of Medicine, Kagawa University, Kagawa,761-0793, Japan; †Department of Environmental Health, National Institute of Public Health, Wako, 351-0197, Japan; ‡Division of Bioengineering and Bioinformatics, Graduate School of Information Science and Technology, Hokkaido University, Sapporo, 060-0814, Japan; §EPR Center for the Study of Viable Systems, Department of Radiology, The Geisel School of Medicine at Dartmouth, Lebanon, NH 03766
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25
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Monteiro JB, Oliani MG, Guilardi LF, Prochnow C, Rocha Pereira GK, Bottino MA, de Melo RM, Valandro LF. Fatigue failure load of zirconia-reinforced lithium silicate glass ceramic cemented to a dentin analogue: Effect of etching time and hydrofluoric acid concentration. J Mech Behav Biomed Mater 2017; 77:375-382. [PMID: 28988143 DOI: 10.1016/j.jmbbm.2017.09.028] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2017] [Revised: 09/15/2017] [Accepted: 09/18/2017] [Indexed: 10/18/2022]
Abstract
This study aimed to evaluate the effect of etching time and hydrofluoric acid (HF) concentration on the fatigue failure load and surface characteristics of zirconia-reinforced lithium silicate glass (ZLS) ceramic cemented to a dentin-like, fiber reinforced epoxy resin. Ceramic (Suprinity, VITA) (1.0mm thick) and epoxy resin (2.5mm thick) discs (10mm diameter) were produced. The bonding surface of the ceramic samples was nonetched (control group), or etched for 30, 60 or 90s by 5% or 10% HF. The epoxy resin discs were etched by 10% HF for 30s followed by the application of an adhesive material (Single Bond Universal, 3M ESPE). Pairs of ceramic/epoxy resin discs were cemented with a dual cure resin cement. The fatigue failure load was determined by the staircase method (500,000 cycles at 20Hz; initial load = 925N; step size = 45N). In 10% HF the etching time was shown to influence the fatigue failure load, which increased as the etching time increased (30s < 60s < 90s), and in 5% HF the fatigue failure load was not shown to be affected by the etching time; the lowest fatigue failure loads were produced in the control group without ceramic etching followed by 10% HF acid etching for 30s. Topography analysis showed variations based on the etching protocols. All fractures (radial cracks) were shown to originate from defects at the ceramic surface on the cementing interface. For fatigue loading improvements of ZLS ceramic, 10% HF acid etching for 90s and silanization of the ceramic surface is recommended.
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Affiliation(s)
- Jaiane Bandoli Monteiro
- PhD Post-Graduate Program in Restorative Dentistry (Prosthodontics Units), Univ. Estadual Paulista (UNESP), Institute of Science and Technology at Sao Jose dos Campos, Sao Jose dos Campos, Sao Paulo State, Brazil.
| | - Marcelo Gallo Oliani
- PhD Post-Graduate Program in Restorative Dentistry (Prosthodontics Units), Univ. Estadual Paulista (UNESP), Institute of Science and Technology at Sao Jose dos Campos, Sao Jose dos Campos, Sao Paulo State, Brazil.
| | - Luis Felipe Guilardi
- PhD Post-Graduate Program in Oral Science (Prosthodontic Units), Faculty of Odontology, Federal University of Santa Maria, R. Floriano Peixoto, 1184, 97015-372 Santa Maria, Rio Grande do Sul, Brazil.
| | - Catina Prochnow
- PhD Post-Graduate Program in Oral Science (Prosthodontic Units), Faculty of Odontology, Federal University of Santa Maria, R. Floriano Peixoto, 1184, 97015-372 Santa Maria, Rio Grande do Sul, Brazil.
| | - Gabriel Kalil Rocha Pereira
- PhD Post-Graduate Program in Oral Science (Prosthodontic Units), Faculty of Odontology, Federal University of Santa Maria, R. Floriano Peixoto, 1184, 97015-372 Santa Maria, Rio Grande do Sul, Brazil; MSciD Graduate Program, School of Dentistry, Meridional Faculty - IMED, Passo Fundo, Rio Grande do Sul, Brazil.
| | - Marco Antonio Bottino
- PhD Post-Graduate Program in Restorative Dentistry (Prosthodontics Units), Univ. Estadual Paulista (UNESP), Institute of Science and Technology at Sao Jose dos Campos, Sao Jose dos Campos, Sao Paulo State, Brazil.
| | - Renata Marques de Melo
- PhD Post-Graduate Program in Restorative Dentistry (Prosthodontics Units), Univ. Estadual Paulista (UNESP), Institute of Science and Technology at Sao Jose dos Campos, Sao Jose dos Campos, Sao Paulo State, Brazil.
| | - Luiz Felipe Valandro
- PhD Post-Graduate Program in Oral Science (Prosthodontic Units), Faculty of Odontology, Federal University of Santa Maria, R. Floriano Peixoto, 1184, 97015-372 Santa Maria, Rio Grande do Sul, Brazil.
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26
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Sample-specific odontometric sex estimation: A method with potential application to burned remains. Sci Justice 2017; 57:262-269. [DOI: 10.1016/j.scijus.2017.03.001] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/15/2016] [Revised: 03/08/2017] [Accepted: 03/15/2017] [Indexed: 01/31/2023]
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Inter-proximal enamel reduction in contemporary orthodontics. Br Dent J 2016; 221:757-763. [DOI: 10.1038/sj.bdj.2016.945] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/19/2016] [Indexed: 11/08/2022]
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Abstract
Studies on individuals with sex chromosome anomalies have demonstrated the promoting effect of the Y chromosome on tooth crown enamel and dentin growth. The present research investigated permanent tooth root lengths in 47,XYY males. The measurements were made from panoramic radiographs. The results indicate longer tooth roots in 47,XYY males compared with those in control males and females. The promoting effect of the Y chromosome on dental growth thus continues in the form of root dentin after the completion of crown growth. The results, together with those on tooth crown sizes in 47,XYY males, suggest that growth excesses are evident and final, beginning a few months after birth and continuing up to the age of 14 years, at least. The excess root dentin growth in 47,XYY males, as well as sexual dimorphism in the growth of crown and root dentin, might be caused by the same factor on the Y chromosome.
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Brezulier D, Turpin YL, Sorel O. A Protocol for Treatment of Minor Orthodontic Relapse During Retention. J ESTHET RESTOR DENT 2016; 28:359-366. [PMID: 27426275 DOI: 10.1111/jerd.12227] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
OBJECTIVES Successful orthodontic treatment presupposes that the esthetic and functional outcomes are maintained. Bonded retainers on the incisors and canines provide this stability. Failure of one or two units exposes the teeth to a relapse. This article describes the use of a retainer wire and an elastic device to provide rapid, effective and esthetic correction of incipient crowding. CLINICAL ASPECTS After removing the retainer, a fixed appliance comprising a replacement retainer and a clear elastic are positioned. This device exerts a free tipping force on malpositioned teeth. The space required to realign the contact points is obtained by stripping. When the misaligned teeth are corrected, they are bonded to the retainer and the height of the incisal edges is equalized. CONCLUSIONS The combination of a new elastic-activated retainer and stripping makes it possible to ensure rapid and effective correction of moderate relapsed crowding. CLINICAL SIGNIFICANCE This article demonstrates the efficacy of a retainer used to correct incipient relapsing crowding. The esthetics of the anterior alignment is restored by means of an almost invisible device. This solution also permits functional guidance to be restored with minimal intervention on the dental tissues while avoiding conventional esthetic techniques involving lingual brackets. (J Esthet Restor Dent 28:359-366,2016).
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Affiliation(s)
- Damien Brezulier
- Interne en Orthopédie dentofaciale, Service d'Odontologie et Chirurgie Buccal, CHU de Rennes, 2 Place Pasteur, 35000 Rennes, Université Rennes 1, 35000 Rennes, France
| | - Yann-Loïg Turpin
- Maître de Conférence des Universités - Praticien hospitalier, Service d'Odontologie et Chirurgie buccal, CHU de Rennes, 2 Place Pasteur, 35000 Rennes, Université Rennes 1, Rennes, 35000, France
| | - Olivier Sorel
- Professeur des Universités - Praticien hospitalier, Service d'Odontologie et Chirurgie buccal, CHU de Rennes, 2 Place Pasteur, 35000 Rennes, Université Rennes 1, Rennes, 35000, France
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30
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Wang Y, Specht A, Liu Y, Finney L, Maxey E, Vogt S, Zheng W, Weisskopf M, Nie LH. Microdistribution of lead in human teeth using microbeam synchrotron radiation X-ray fluorescence (μ-SRXRF). X-RAY SPECTROMETRY : XRS 2016; 46:19-26. [PMID: 32863464 PMCID: PMC7451221 DOI: 10.1002/xrs.2720] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Lead (Pb) exposure is known to be associated with adverse effects on human health, especially during the prenatal period and early childhood. The Pb content in teeth has been suggested as a useful biomarker for the evaluation of cumulative Pb exposure. This study was designed to employ the microbeam synchrotron radiation X-ray fluorescence technique to determine the microdistribution of Pb within the tooth to evaluate the reliability of the technique and the effectiveness of tooth Pb as a biomarker of Pb exposure. The results showed that in the incisor sample, Pb primarily deposited in secondary dentine region close to the pulp and secondarily at enamel exterior. In addition, Pb colocalised with Zn, indicating a positive correlation between Pb and Zn. By contrast,in the two molar samples, Pb accumulated principally in the pulp, and secondarily in the enamel. At the same time, Pb in these two molar samples colocalised with Ca instead of Zn as was observed in the incisor sample. Several batches of line scans further confirmed the conclusions. The feasibility of using microbeam synchrotron radiation X-ray fluorescence to determine the microdistribution of Pb in teeth and of using the tooth Pb, especially in dentine, as a biomarker was discussed.
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Affiliation(s)
- Yufei Wang
- School of Health Sciences, Purdue University, West Lafayette, IN, 47907, USA
| | - Aaron Specht
- School of Health Sciences, Purdue University, West Lafayette, IN, 47907, USA
| | - Yingzi Liu
- School of Health Sciences, Purdue University, West Lafayette, IN, 47907, USA
| | - Lydia Finney
- Advanced Photon Source, Argonne National Laboratory, Lemont, IL, 60439, USA
| | - Evan Maxey
- Advanced Photon Source, Argonne National Laboratory, Lemont, IL, 60439, USA
| | - Stefan Vogt
- Advanced Photon Source, Argonne National Laboratory, Lemont, IL, 60439, USA
| | - Wei Zheng
- School of Health Sciences, Purdue University, West Lafayette, IN, 47907, USA
| | - Marc Weisskopf
- Departments of Environmental Health and Epidemiology, Harvard T.H. Chan School of Public Health, Boston, MA, 02215, USA
| | - Linda H Nie
- School of Health Sciences, Purdue University, West Lafayette, IN, 47907, USA
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31
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Lee YK. Color Correlations among Six Types of Permanent Anterior Teeth. J ESTHET RESTOR DENT 2016; 28 Suppl 1:S5-S13. [PMID: 26887803 DOI: 10.1111/jerd.12193] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
STATEMENT OF PROBLEM When multiple teeth are missing, the color for missing teeth should be estimated based on the color of remaining teeth. PURPOSE The purpose was to determine the strength of color correlations among six types of permanent anterior teeth. METHODS Color of 12 anterior teeth was measured by Shade Vision System for 47 volunteers. The color coordinates in each type of teeth such as maxillary central incisor (MX1), lateral incisor (MX2), and canine (MX3), and mandibular central incisor (MD1), lateral incisor (MD2), and canine (MD3) were determined. Correlations and differences among the corresponding color coordinates of each type of teeth were determined. RESULTS Compared with MX1, the differences were in the range of -3.2 to -6.5 in L*, 0.5 to 2.7 in a*, -0.7 to 7.5 in b*, and the color difference (ΔE*ab ) was 4.5 to 10.3. The color difference by ΔE00 formula was 3.1-6.7. Although the color coordinates were different by tooth type, they generally showed correlations (p < 0.001). CONCLUSIONS For the color estimation of missing MX1, the color coordinates of MD1 were the strongest predictors. In case of missing MX3, L* and a* of MD3 and b* of MX1 were the strongest predictors for each corresponding coordinates. CLINICAL SIGNIFICANCE The color for missing teeth, especially for maxillary central incisor and maxillary and mandibular canines, could be estimated based on those of the same type teeth on the opposing arch. These results should be applied for clinical color selection for missing teeth.(J Esthet Restor Dent 28:S5-S13, 2016).
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Affiliation(s)
- Yong-Keun Lee
- Director, Institute for Clinical Performance of Biomaterials (ICPB) and ETN Dental Clinic, Seoul, Korea
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32
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Ang AGP, Steegmans PAJ, Kerdijk W, Livas C, Ren Y. Radiographic technique and brackets affect measurements of proximal enamel thickness on mandibular incisors. Eur J Orthod 2016; 39:25-30. [PMID: 26823372 DOI: 10.1093/ejo/cjw004] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
OBJECTIVE To investigate the influence of radiographic film and tube positioning, the presence and the size of brackets on in vitro measurements of proximal enamel thickness of mandibular incisors on periapical radiographs aimed to aid planning of interproximal enamel reduction procedures in orthodontics. MATERIALS AND METHODS Eighty human mandibular incisors were assigned to sets of four and located in a customized base. Periapical radiographs were taken with the film positioned at three different angles (0°, 2°, and 5°) in relation to the frontal plane and the tube head positioned at five angles (0°, -2°, -5°, +2°, and +5°) in relation to the sagittal plane. The proximal enamel width was calculated by means of computerized image analysis and compared with measurements obtained at 0°. Statistical analysis was carried out to compare the enamel measurements on radiographs made with all angular combinations with and without the presence of brackets of different dimensions. RESULTS A significant difference (P < 0.05) was found between the measurements of proximal enamel width obtained at the different angles in relation to the frontal and sagittal planes for all sets with or without brackets. The presence of brackets significantly affected the measured width only for the enamel side further away from the radiation source at the sagittal plane (P < 0.05). CONCLUSION Angular changes in taking periapical radiographs of mandibular incisors and the presence of brackets significantly affect interproximal enamel measurements made with image analysis software.
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Affiliation(s)
- Amy Giok Phing Ang
- Department of Orthodontics, University of Groningen, University Medical Centre Groningen, Groningen, The Netherlands
| | - Pauline Antoinette Josephine Steegmans
- Department of Dentistry, University of Groningen, University Medical Centre Groningen, Centre for Dentistry and Oral Hygiene, Groningen, The Netherlands and
| | - Wouter Kerdijk
- Department of Public and Individual Oral Health, University of Groningen, University Medical Centre Groningen, Centre for Dentistry and Oral Hygiene, Groningen, The Netherlands
| | - Christos Livas
- Department of Orthodontics, University of Groningen, University Medical Centre Groningen, Groningen, The Netherlands,
| | - Yijin Ren
- Department of Orthodontics, University of Groningen, University Medical Centre Groningen, Groningen, The Netherlands
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Rocha Gomes Torres C, Guimarães CA, Ribeiro ZEA, Borges AB. Influence of Different Types and Concentrations of Chemical Catalysts on Dental Bleaching Efficiency. J Contemp Dent Pract 2015; 16:893-902. [PMID: 26718298 DOI: 10.5005/jp-journals-10024-1778] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The objective of this study was to evaluate the effects of different types and concentrations of chemical catalysts on the efficiency of 35% hydrogen peroxide gel on dental bleaching. Enamel-dentin disks were obtained from bovine incisors and the initial color was assessed. The groups were divided according to the type and concentration of catalyst added to an experimental gel: ferrous sulphate (FS) (0.001, 0.002 and 0.003%); ferrous gluconate (Fg) (0.01, 0.02 and 0.03%); ferric chloride (FC) (0.01, 0.02 and 0.03%); manganese gluconate (MG) (0.01, 0.02 and 0.03%); and manganese chloride (MC) (0.01, 0.02 and 0.03%). The positive control (PC) group received the bleaching gel without any catalyst, while in the negative control (NC) the specimens remained in artificial saliva. Three applications of the bleaching gels were performed for 10 minutes each, repeated after 7 days. Color assessments were performed 7 days after the first session and 7 days after the second. The specimens were stored in artificial saliva and assessed again after 1 year. The data were analyzed by parametric analysis of variance and Tukey's test. Some of the chemical catalysts tested were effective in reducing the yellowish color of the samples in relation to the positive control group after 1 and 2 applications and diminished the color relapse over time. After 1 year, the FS was the most effective catalyst tested. We concluded that some chemical catalysts increased the efficiency of dental bleaching.
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Affiliation(s)
- Carlos Rocha Gomes Torres
- Associate Professor, Department of Restorative Dentistry, Institute of Science and Technology, Sao Paulo State University, Sao Paulo, Brazil, Phone: 55 12 3947-9376, e-mail:
| | - Carolina Anne Guimarães
- Department of Restorative Dentistry, Institute of Science and Technology, Sao Paulo State University, Sao Paulo, Brazil
| | - Zulene Eveline Abreu Ribeiro
- Department of Restorative Dentistry, Institute of Science and Technology, Sao Paulo State University, Sao Paulo, Brazil
| | - Alessandra Bühler Borges
- Department of Restorative Dentistry, Institute of Science and Technology, Sao Paulo State University, Sao Paulo, Brazil
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Zingler S, Sommer A, Sen S, Saure D, Langer J, Guillon O, Lux CJ. Efficiency of powered systems for interproximal enamel reduction (IER) and enamel roughness before and after polishing—an in vitro study. Clin Oral Investig 2015; 20:933-42. [PMID: 26419674 DOI: 10.1007/s00784-015-1585-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2014] [Accepted: 08/30/2015] [Indexed: 11/30/2022]
Affiliation(s)
- Sebastian Zingler
- Department of Orthodontics and Dentofacial Orthopaedics, University of Heidelberg, Heidelberg, Germany.
| | - Andreas Sommer
- Department of Orthodontics and Dentofacial Orthopaedics, University of Heidelberg, Heidelberg, Germany
| | - Sinan Sen
- Department of Orthodontics and Dentofacial Orthopaedics, University of Heidelberg, Heidelberg, Germany
| | - Daniel Saure
- Institute of Medical Biometry and Informatics, University of Heidelberg, Heidelberg, Germany
| | - Jochen Langer
- Institute of Materials Science, Technische Universität Darmstadt, Darmstadt, Germany
- Heraeus Holding GmbH, Hanau, Germany
| | - Olivier Guillon
- Institute of Materials Science, Technische Universität Darmstadt, Darmstadt, Germany
- Forschungszentrum Jülich GmbH, Institute of Energy and Climate Research, Materials Synthesis and Processing, Jülich, Germany
| | - Christopher J Lux
- Department of Orthodontics and Dentofacial Orthopaedics, University of Heidelberg, Heidelberg, Germany
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35
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Soares DG, Basso FG, Scheffel DS, Hebling J, de Souza Costa CA. Responses of human dental pulp cells after application of a low-concentration bleaching gel to enamel. Arch Oral Biol 2015; 60:1428-36. [DOI: 10.1016/j.archoralbio.2015.06.014] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2014] [Revised: 03/28/2015] [Accepted: 06/14/2015] [Indexed: 01/17/2023]
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Tardivo D, Sastre J, Catherine JH, Leonetti G, Adalian P, Foti B. Gender Determination of Adult Individuals by Three-Dimensional Modeling of Canines. J Forensic Sci 2015; 60:1341-5. [PMID: 26258554 DOI: 10.1111/1556-4029.12821] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2013] [Revised: 09/01/2014] [Accepted: 09/03/2014] [Indexed: 11/30/2022]
Abstract
Gender determination is a fundamental issue in forensic anthropology. Many techniques based on bone and dental remains have been proposed. It is not always possible to implement the techniques using bones, but teeth are often perfectly preserved. It has been demonstrated that the canine has the greatest sexual dimorphism, and the aim of this work was to provide an easy and accurate dental technique for determining the gender in the absence of other skeletal elements. The sample was composed of 210 CT scans with four healthy canines. The 840 canines were modeled using MIMICS® 10.01 software. The total volume of each tooth was determined. Seven mathematical models were determined by binary logistic regressions and ranked in order of relative performance. The seven proposed predictive models thus performed (0.910≤AUC≤0.938), with overall rates of correct predictions between 82.38 and 85.24%. The 4-canine model is the most powerful for predicting the gender.
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Affiliation(s)
- Delphine Tardivo
- Unité Mixte de Recherche 7268 ADES, Aix-Marseille Université-EFS-CNRS, Faculté de Médecine de Marseille, 51 Boulevard Pierre Dramard, 13344, Marseille Cedex 15, France.,UFR d'Odontologie, 27 Boulevard Jean Moulin, 13385, Marseille Cedex 5, France
| | - Julien Sastre
- Unité Mixte de Recherche 7268 ADES, Aix-Marseille Université-EFS-CNRS, Faculté de Médecine de Marseille, 51 Boulevard Pierre Dramard, 13344, Marseille Cedex 15, France.,UFR d'Odontologie, 27 Boulevard Jean Moulin, 13385, Marseille Cedex 5, France
| | - Jean-Hugues Catherine
- Unité Mixte de Recherche 7268 ADES, Aix-Marseille Université-EFS-CNRS, Faculté de Médecine de Marseille, 51 Boulevard Pierre Dramard, 13344, Marseille Cedex 15, France.,UFR d'Odontologie, 27 Boulevard Jean Moulin, 13385, Marseille Cedex 5, France
| | - Georges Leonetti
- Unité Mixte de Recherche 7268 ADES, Aix-Marseille Université-EFS-CNRS, Faculté de Médecine de Marseille, 51 Boulevard Pierre Dramard, 13344, Marseille Cedex 15, France.,Service de Médecine Légale et de Droit de la Santé, Faculté de Médecine, 27 Boulevard Jean Moulin, 13385, Marseille Cedex 20, France
| | - Pascal Adalian
- Unité Mixte de Recherche 7268 ADES, Aix-Marseille Université-EFS-CNRS, Faculté de Médecine de Marseille, 51 Boulevard Pierre Dramard, 13344, Marseille Cedex 15, France.,Service Anthropologie, Faculté de Médecine, 27 Boulevard Jean Moulin, 13385, Marseille Cedex 20, France
| | - Bruno Foti
- Unité Mixte de Recherche 7268 ADES, Aix-Marseille Université-EFS-CNRS, Faculté de Médecine de Marseille, 51 Boulevard Pierre Dramard, 13344, Marseille Cedex 15, France.,UFR d'Odontologie, 27 Boulevard Jean Moulin, 13385, Marseille Cedex 5, France
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Chunhacheevachaloke E, Ajcharanukul O. Effects of conducting media and gender on an electric pulp test. Int Endod J 2015; 49:237-44. [DOI: 10.1111/iej.12446] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2014] [Accepted: 03/04/2015] [Indexed: 10/23/2022]
Affiliation(s)
- E. Chunhacheevachaloke
- Department of Pediatric and Preventive Dentistry; Srinakharinwirot University; Bangkok Thailand
| | - O. Ajcharanukul
- Department of Stomatology; Faculty of Dentistry; Srinakharinwirot University; Bangkok Thailand
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38
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Tooth preparation for full-coverage restorations—a literature review. Clin Oral Investig 2015; 19:959-68. [DOI: 10.1007/s00784-015-1439-y] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2014] [Accepted: 02/23/2015] [Indexed: 10/23/2022]
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39
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Soares DG, Marcomini N, Basso FG, Pansani TN, Hebling J, de Souza Costa CA. Indirect cytocompatibility of a low-concentration hydrogen peroxide bleaching gel to odontoblast-like cells. Int Endod J 2015; 49:26-36. [PMID: 25557717 DOI: 10.1111/iej.12426] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2014] [Accepted: 12/23/2014] [Indexed: 12/27/2022]
Abstract
AIM To assess the initial cytotoxicity and the late phenotype marker expression of odontoblast-like cells (MDPC-23) subjected to less aggressive in-office bleaching therapies. METHODOLOGY A 17.5% hydrogen peroxide (H2O2) gel was applied for 45, 15 or 5 min to enamel/dentine discs adapted to trans-wells positioned over cultured MDPC-23 cells. No treatment was performed on the negative control. Immediately after bleaching, the cell viability, gene expression of inflammatory mediators and quantification of H2O2 diffusion were evaluated. The ALP activity, DSPP and DMP-1 gene expression and mineralized nodule deposition (MND) were assessed at 7, 14 or 21 days post-bleaching and analysed statistically with Mann-Whitney U-tests (α = 5%). RESULTS H2O2 diffusion, proportional to treatment time, was observed in all bleached groups. Reductions of approximately 31%, 21% and 13% in cell viability were observed for the 45-, 15- and 5-min groups, respectively. This reduction was significant (P < 0.05) for the 45- and 15-min groups, which also presented significant (P < 0.05) over-expression of inflammatory mediators. The 45-min group was associated with significant (P < 0.05) reductions in DMP-1/DSPP expression at all periods, relative to control. The ALP activity and MND were reduced only in initial periods. The 15-min group had less intense reduction of all markers, with no difference to control at 21 days. CONCLUSIONS The 17.5% H2O2 applied to tooth specimens for 5 min caused no alteration in the odontoblast-like cells. When this gel was applied for 45 or 15 min, a slight cytotoxicity, associated with alterations in phenotypic markers, was observed. However, cells were able to recover their functions up to 21 days post-bleaching.
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Affiliation(s)
- D G Soares
- Department of Physiology and Pathology, Araraquara School of Dentistry, University of Estadual Paulista (UNESP), Araraquara, Brazil
| | - N Marcomini
- Department of Physiology and Pathology, Araraquara School of Dentistry, University of Estadual Paulista (UNESP), Araraquara, Brazil
| | - F G Basso
- Department of Orthodontics and Pediatric Dentistry, Araraquara School of Dentistry, University of Estadual Paulista (UNESP), Araraquara, Brazil
| | - T N Pansani
- Department of Dental Materials and Prosthodontics, Araraquara School of Dentistry, University of Estadual Paulista (UNESP), Araraquara, Brazil
| | - J Hebling
- Department of Orthodontics and Pediatric Dentistry, Araraquara School of Dentistry, University of Estadual Paulista (UNESP), Araraquara, Brazil
| | - C A de Souza Costa
- Department of Physiology and Pathology, Araraquara School of Dentistry, University of Estadual Paulista (UNESP), Araraquara, Brazil
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Bergoli CD, Meira JBC, Valandro LF, Bottino MA. Survival Rate, Load to Fracture, and Finite Element Analysis of Incisors and Canines Restored With Ceramic Veneers Having Varied Preparation Design. Oper Dent 2014; 39:530-40. [DOI: 10.2341/13-179] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
SUMMARY
Purpose
To evaluate the survival rate, success rate, load to fracture, and finite element analysis (FEA) of maxillary central incisors and canines restored using ceramic veneers and varying preparation designs.
Methods and Materials
Thirty human maxillary central incisors and 30 canines were allocated to the following four groups (n=15) based on the preparation design and type of tooth: Gr1 = central incisor with a conservative preparation; Gr2 = central incisor with a conventional preparation with palatal chamfer; Gr3 = canine with a conservative preparation; Gr4 = canine with a conventional preparation with palatal chamfer. Ceramic veneers (lithium disilicate) were fabricated and adhesively cemented (Variolink Veneer). The specimens were subjected to 4 × 106 mechanical cycles and evaluated at every 500,000 cycles to detect failures. Specimens that survived were subjected to a load to fracture test. Bidimensional models were modeled (Rhinoceros 4.0) and evaluated (MSC.Patrans 2005r2 and MSC.Marc 2005r2) on the basis of their maximum principal stress (MPS) values. Survival rate values were analyzed using the Kaplan-Meier test (α = 0.05) and load to fracture values were analyzed using the Student t-test (α = 0.05).
Results
All groups showed 100% survival rates. The Student t-test did not show any difference between the groups for load to fracture. FEA showed higher MPS values in the specimens restored using veneers with conventional preparation design with palatal chamfer.
Conclusion
Preparation design did not affect the fracture load of canines and central incisors, but the veneers with conventional preparation design with palatal chamfer exhibited a tendency to generate higher MPS values.
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Affiliation(s)
- CD Bergoli
- Cesar Dalmolin Bergoli, PhD, Federal University of Pelotas, Dentistry School, Pelotas, Brazil
| | - JBC Meira
- Josete Barbosa Cruz Meira, PhD, São Paulo State University (USP), Biomaterials and Oral Biology Department, São Paulo, Brazil
| | - LF Valandro
- Luiz Felipe Valandro, PhD, Federal University of Santa Maria, Restorative Dentistry (Prosthodontics), Santa Maria, Brazil
| | - MA Bottino
- Marco Antonio Bottino, PhD, São Paulo State University (UNESP), Dental Materials and Prosthodontics, São Jose dos Campos, Brazil
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Chen C, Trindade FZ, de Jager N, Kleverlaan CJ, Feilzer AJ. The fracture resistance of a CAD/CAM Resin Nano Ceramic (RNC) and a CAD ceramic at different thicknesses. Dent Mater 2014; 30:954-62. [DOI: 10.1016/j.dental.2014.05.018] [Citation(s) in RCA: 83] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2013] [Revised: 12/20/2013] [Accepted: 05/21/2014] [Indexed: 10/25/2022]
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Cleidocranial dysplasia case report: remodeling of teeth as aesthetic restorative treatment. Case Rep Dent 2014; 2014:901071. [PMID: 25045546 PMCID: PMC4087277 DOI: 10.1155/2014/901071] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2014] [Accepted: 06/05/2014] [Indexed: 11/24/2022] Open
Abstract
Cleidocranial dysplasia (CCD), is an autosomal dominant disorder with a prevalence of 1 in 1,000,000 individuals. It is generally characterized by orofacial manifestations, including enamel hypoplasia, retained primary teeth, and impacted permanent and supernumerary teeth. The successful treatment involving a timing intervention (orthodontic-maxillofacial surgeons-restorative) is already described. However, the restorative treatment might improve the aesthetic final result in dentistry management for patients with cleidocranial dysplasia. Objective. Therefore, this clinical report presents a conservative restorative management (enamel microabrasion, dental bleaching, and direct composite resin) for aesthetic solution for a patient with CCD. Clinical Considerations. The cosmetic remodeling is a conservative, secure, and low cost therapy that can be associated with other procedures such as enamel microabrasion and dental bleaching to achieve optimal outcome. Additionally, the Golden Proportion can be used to guide dental remodeling to improve the harmony of the smile and the facial composition. Conclusions. Thus, dentists must know and be able to treat dental aesthetic problems in cleidocranial dysplasia patients. The intention of this paper is to describe a restorative approach with the cosmetic remodeling teeth (by grinding or addicting material) associated with enamel microabrasion and dental bleaching to reestablish the form, shape, and color of smile for patients with cleidocranial dysplasia.
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Abstract
Debate based on an opinion article published in the British Dental Journal entitled 'Truth or consequences: the potential implications of short-term cosmetic orthodontics for general dental practitioners' by R. A. C. Chate ( 2013; 215: 551-553; www.nature.com/bdj/journal/v215/n11/full/sj.bdj.2013.1140.html).
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44
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Odontometric sex variation in Malaysians with application to sex prediction. Forensic Sci Int 2014; 234:183.e1-7. [DOI: 10.1016/j.forsciint.2013.09.019] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2012] [Revised: 07/17/2013] [Accepted: 09/16/2013] [Indexed: 11/20/2022]
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Borges AB, Batista GR, Arantes PT, Wiegand A, Attin T, Torres CRG. Influence of Simulated Pulpal Pressure on Efficacy of Bleaching Gels. J Contemp Dent Pract 2014; 15:407-12. [PMID: 25576104 DOI: 10.5005/jp-journals-10024-1553] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
ABSTRACT
Aim
The aim of this study was to investigate the influence of simulated pulpal pressure on efficacy of bleaching gels.
Materials and methods
Cylindrical enamel-dentin specimens from bovine teeth (3 mm diameter, enamel and dentin layer each 1 mm thick) were divided into 4 groups, according to the bleaching treatment: negative control (non-bleached), bleached with 10% carbamide peroxide (CP), bleached with 7.5% hydrogen peroxide (HP) and bleached with 35% hydrogen peroxide. Ten percent CP gel was applied for 8 h/day and 7.5% HP for 1 h/day, during 14 days. For 35% HP treatment, two sessions of 45 minutes each were employed. In intermediate periods specimens were stored in artificial saliva. Experimental groups (n = 19) were subdivided according to the simulation of pulpal pressure (25 mm Hg) during bleaching treatment. Initial color measurement and after bleaching treatment were assessed by spectrophotometry, using CIE L*a*b* system. The data were statistically analyzed by ANOVA and Dunnett's posthoc tests (p < 0.05).
Results
There was significant difference of ∆E for all experimental groups compared to negative control group, according to Dunnett's test (p < 0.0001). There were no significant difference for total color variation (∆E) among experimental groups (p > 0.05).
Conclusion
It was concluded that all bleaching gels showed bleaching efficacy compared to non-bleached group and that the simulated pulpal pressure did not influence the bleaching outcomes of the tested gels.
Clinical significance
Although numerous in vitro studies investigating the efficacy of bleaching agents have been performed, they do not properly simulate the pulpal pressure. In order to make these studies closer to clinical conditions, it is important to reproduce these conditions in laboratory, so the results can be more reliable. This in vitro study was performed under simulated pulpal pressure, aiming to investigate its influence on dental bleaching outcomes.
How to cite this article
Borges AB, Batista GR, Arantes PT, Wiegand A, Attin T, Torres CRG. Influence of Simulated Pulpal Pressure on Efficacy of Bleaching Gels. J Contemp Dent Pract 2014;15(4):407-412.
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Affiliation(s)
- Alessandra Bühler Borges
- Assistant Professor, Department of Restorative Dentistry, School of Dentistry UNESP, São Jose dos Campus, São Paulo, Brazil, e-mail:
| | - Graziela Ribeiro Batista
- PhD Student, Department of Restorative Dentistry, School of Dentistry UNESP, São Jose dos Campus, São Paulo, Brazil
| | - Paula Tamião Arantes
- MSc Student, Department of Restorative Dentistry, School of Dentistry UNESP, São Jose dos Campus, São Paulo, Brazil
| | - Annette Wiegand
- Head, Department of Preventive Dentistry, Periodontology and Cariology, University of Göttingen, Göttingen, Germany
| | - Thomas Attin
- Chairman, Department of Preventive Dentistry, Periodontology and Cariology, University of Zürich, Plattenstrasse, Zürich Switzerland
| | - Carlos Rocha Gomes Torres
- Associate Professor, Department of Restorative Dentistry, School of Dentistry UNESP, São Jose dos Campus, São Paulo, Brazil
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Ma JL, Shi SZ, Ide Y, Saka H, Matsunaga S, Agematsu H. Volume measurement of crowns in mandibular primary central incisors by micro-computed tomography. Acta Odontol Scand 2013; 71:1032-7. [PMID: 23745971 DOI: 10.3109/00016357.2012.698306] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
OBJECTIVE To determine sex differences in the tissue proportions of crowns of mandibular primary central incisors in Chinese children and to quantify the volume of crown components in three dimensions using micro-computed tomography (micro-CT). MATERIALS AND METHODS The specimens used in this study were 41 mandibular first deciduous incisor teeth with intact crowns (21 males and 20 females) obtained from patients between 5-6 years of age. Each specimen was scanned using micro-CT at a resolution of 0.05 mm and 3D-rendered images were created. The volume of each component of the crown was measured and examined for differences in different sex and ages. RESULTS The pulp chamber volume decreased with age and the volume ratio of the pulp chamber to the whole crown was significantly smaller in 6-year-olds than in 5-year-olds (p < 0.05). CONCLUSIONS Males had significantly larger tooth crown volumes and dentin volumes than females did (p < 0.001), while the volume of enamel showed no sexual dimorphism.
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Affiliation(s)
- Jin-Lan Ma
- Ninth People's Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, PR China
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Simão TM, Valladares-Neto J, Rino-Neto J, de Paiva JB. Iatrogenic absence of maxillary canines: Bolton discrepancy treated with mandibular incisor extraction. Am J Orthod Dentofacial Orthop 2013; 143:713-23. [PMID: 23631973 DOI: 10.1016/j.ajodo.2012.04.026] [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: 01/01/2012] [Revised: 04/01/2012] [Accepted: 04/01/2012] [Indexed: 11/19/2022]
Abstract
This case report describes the orthodontic treatment of an adult patient with iatrogenic absence of the maxillary canines, moderate maxillary and severe mandibular dental crowding, a Bolton discrepancy with a large mandibular anterior excess, a maxillary right lateral incisor crossbite, and Angle Class II molar relationships. The treatment consisted of fixed appliance therapy, mandibular incisor extraction, tooth bleaching, and dental recontouring. This method of treatment maintained the patient's good facial appearance, improved the dental esthetics, and provided a good functional occlusion, eliminating the arch length and Bolton discrepancies and providing a good outcome with minimal undesirable effects.
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Affiliation(s)
- Tassiana Mesquita Simão
- Department of Orthodontics, Dental School, Federal University of Goiás, Goiânia, Goiás, Brazil
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48
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La preparazione del margine cavitario in restauri diretti di denti anteriori: aspetti teorici. DENTAL CADMOS 2013. [DOI: 10.1016/s0011-8524(13)70009-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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49
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Pelino E, Jabali S, Genovesi C, Falivene O, Eramo S. WITHDRAWN: La preparazione del margine cavitario in restauri diretti di denti anteriori: aspetti teorici. DENTAL CADMOS 2012. [DOI: 10.1016/j.cadmos.2012.07.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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50
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Fernandes SA, Vellini-Ferreira F, Scavone-Junior H, Ferreira RI. Crown dimensions and proximal enamel thickness of mandibular second bicuspids. Braz Oral Res 2011; 25:324-30. [PMID: 21860920 DOI: 10.1590/s1806-83242011000400008] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2011] [Accepted: 06/14/2011] [Indexed: 11/22/2022] Open
Abstract
To achieve proper recontouring of anterior and posterior teeth, to obtain optimal morphology during enamel stripping, it is important to be aware of dental anatomy. This study aimed at evaluating crown dimensions and proximal enamel thickness in a sample of 40 extracted sound, human, mandibular, second bicuspids (20 right and 20 left). Mesiodistal, cervico-occlusal and buccolingual crown dimensions were measured using a digital caliper, accurate to 0.01 mm. Teeth were embedded in acrylic resin and cut along their long axes through the proximal surfaces to obtain 0.7 mm-thick central sections. Enamel thickness on the cut sections was measured using a perfilometer. Comparative analyses were carried out using the Student's-t test (α= 5%). The mean mesiodistal crown widths for right and left teeth were 7.79 mm (± 0.47) and 7.70 mm (± 0.51), respectively. Mean cervico-occlusal heights ranged from 8.31 mm (± 0.75) on the right to 8.38 mm (± 0.85) on the left teeth. The mean values for the buccolingual dimension were 8.67 mm (± 0.70) on the right and 8.65 mm (± 0.54) on the left teeth. The mean enamel thickness on the mesial surfaces ranged from 1.35 mm (± 0.22) to 1.40 mm (± 0.17), on the left and right sides, respectively. On the distal surfaces, the corresponding values were 1.44 mm (± 0.21) and 1.46 mm (± 0.12). No significant differences were found between measurements for right and left teeth. However, enamel thickness was significantly greater on the distal surfaces, compared with the mesial surfaces.
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Affiliation(s)
- Sérgio Augusto Fernandes
- Department of Pediatric Dentistry and Orthodontics, University of São Paulo City, São Paulo, SP, Brazil
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