The stress analysis of human teeth

Thresher, R. W.; Saito, Gary E.

doi:10.1016/0021-9290(73)90003-1

Cited by 146 publications

(52 citation statements)

References 9 publications

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“…The photoelastic approach has gradually given way to finite element analysis as the preferred full-field method for characterizing masticatory stresses in various tissues (Thresher and Saito, 1973;Widera et al, 1976;Knoell, 1977;Tanne et al, 1987Tanne et al, , 1995Andersen et al, 1991;Hart et al, 1992;Korioth et al, 1992;Meijer et al, 1993;Korioth and Versluis, 1997). Essentially, finite element modeling (FEM) is a mathematical approach to stress analysis which reduces the prohibitively complex task of describing states of stress in the whole mandible to a series of simpler tasks solved simultaneously.…”

Section: Finite Element Modelingmentioning

confidence: 99%

Experimental observation, theoretical models, and biomechanical inference in the study of mandibular form

Daegling

Hylander

2000

Am. J. Phys. Anthropol.

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Experimental studies and mathematical models are disparate approaches for inferring the stress and strain environment in mammalian jaws. Experimental designs offer accurate, although limited, characterization of biomechanical behavior, while mathematical approaches (finite element modeling in particular) offer unparalleled precision in depiction of strain magnitudes, directions, and gradients throughout the mandible. Because the empirical (experimental) and theoretical (mathematical) perspectives differ in their initial assumptions and their proximate goals, the two methods can yield divergent conclusions about how masticatory stresses are distributed in the dentary. These different sources of inference may, therefore, tangibly influence subsequent biological interpretation. In vitro observation of bone strain in primate mandibles under controlled loading conditions offers a test of finite element model predictions. Two issues which have been addressed by both finite element models and experimental approaches are: (1) the distribution of torsional shear strains in anthropoid jaws and (2) the dissipation of bite forces in the human alveolar process. Not surprisingly, the experimental data and mathematical models agree on some issues, but on others exhibit discordance. Achieving congruence between these methods is critical if the nature of the relationship of masticatory stress to mandibular form is to be intelligently assessed. A case study of functional/mechanical significance of gnathic morphology in the hominid genus Paranthropus offers insight into the potential benefit of combining theoretical and experimental approaches. Certain finite element analyses claim to have identified a biomechanical problem unrecognized in previous comparative work, which, in essence, is that the enlarged transverse dimensions of the postcanine corpus may have a less important role in resisting torsional stresses than previously thought. Experimental data have identified subperiosteal cortical thinning as a culprit in diminishing the role of cross-sectional geometry in conditioning the strain environment. These observations raise questions concerning the biomechanical significance of mandibular form in early hominids, fueling persistent arguments over whether gnathic morphology can be related to dietary specialization in the "robust" australopithecines. Nonmechanical explanations (e.g., tooth size or body size) for Paranthropus mandibular dimensions, however, are not compelling as competing hypotheses. Both theoretical and experimental models are in need of refinement before it is possible to conclude that the jaws of the "robust" australopithecines are not functionally linked to elevated masticatory loads.

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Section: Finite Element Modelingmentioning

confidence: 99%

Experimental observation, theoretical models, and biomechanical inference in the study of mandibular form

Daegling

Hylander

2000

Am. J. Phys. Anthropol.

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“…The mechanical behavior of sound teeth is considered the benchmark for restored structures, and as such has been the subject of several stress analyses, alone (Thresher andSaito, 1973, Selna et al, 1975;Rubin et al, 1983, Sakaguchi et al, 1991 and in comparison with restored ones (Yettram et at., 1976, Peters andMorin et al, 1988;Hubsch et at., 1993, Reeh andRoss, 1994).…”

Section: Introductionmentioning

confidence: 99%

Modeling the Mechanical Behavior of the Jaws and Their Related Structures By Finite Element (Fe) Analysis

Korioth

Versluis

1997

Critical Reviews in Oral Biology & Medicine

175

121

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In this paper, we provide a review of mechanical finite element analyses applied to the maxillary and/or mandibular bone with their associated natural and restored structures. It includes a description of the principles and the relevant variables involved, and their critical application to published finite element models ranging from three-dimensional reconstructions of the jaws to detailed investigations on the behavior of natural and restored teeth, as well as basic materials science. The survey revealed that many outstanding FE approaches related to natural and restored dental structures had already been done 10-20 years ago. Several three-dimensional mandibular models are currently available, but a more realistic correlation with physiological chewing and biting tasks is needed. Many FE models lack experimentally derived material properties, sensitivity analyses, or validation attempts, and yield too much significance to their predictive, quantitative outcome. A combination of direct validation and, most importantly, the complete assessment of methodical changes in all relevant variables involved in the modeled system probably indicates a good FE modeling approach. A numerical method for addressing mechanical problems is a powerful contemporary research tool. FE analyses can provide precise insight into the complex mechanical behavior of natural and restored craniofacial structures affected by three-dimensional stress fields which are still very difficult to assess otherwise.

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“…Some later works were presented by this research group in following years (Craig & Farah, 1977;Farah et al, 1973;Farah & Craig, 1974). Other pioneering works in those years were presented by Thresher and Saito (Thresher & Saito, 1973) and Selna et al(Selna et al, 1975). These first works were twodimensional and were conducted with programs developed by the researchers themselves.…”

Section: Historical Overview Of Biomechanical Models For Simulating Ementioning

confidence: 97%

Biomechanical Models of Endodontic Restorations

Pérez-González¹,

González-Lluch²,

Sancho-Bru³

et al. 2011

Theoretical Biomechanics

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The stress analysis of human teeth

Cited by 146 publications

References 9 publications

Experimental observation, theoretical models, and biomechanical inference in the study of mandibular form

Experimental observation, theoretical models, and biomechanical inference in the study of mandibular form

Modeling the Mechanical Behavior of the Jaws and Their Related Structures By Finite Element (Fe) Analysis

Biomechanical Models of Endodontic Restorations

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