The Evolutionary Paradox of Tooth Wear: Simply Destruction or Inevitable Adaptation?

被引:32
作者
Benazzi, Stefano [1 ]
Huynh Nhu Nguyen [1 ]
Schulz, Dieter [2 ]
Grosse, Ian R. [3 ]
Gruppioni, Giorgio [4 ]
Hublin, Jean-Jacques [1 ]
Kullmer, Ottmar [5 ]
机构
[1] Max Planck Inst Evolutionary Anthropol, Dept Human Evolut, Leipzig, Germany
[2] Dent Workshop Bensheim, Private Lab Training Res & Methods, Heppenheim, Germany
[3] Univ Massachusetts, Dept Mech & Ind Engn, Amherst, MA 01003 USA
[4] Univ Bologna, Dept Cultural Heritage, Ravenna, Italy
[5] Senckenberg Res Inst, Dept Palaeoanthropol & Messel Res, Frankfurt, Germany
关键词
NONCARIOUS CERVICAL LESIONS; FINITE-ELEMENT-ANALYSIS; STRESS-DISTRIBUTION; OCCLUSAL WEAR; BRIEF COMMUNICATION; IN-VITRO; ABFRACTION; PATTERNS; RESTORATION; POPULATIONS;
D O I
10.1371/journal.pone.0062263
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
070301 [无机化学]; 070403 [天体物理学]; 070507 [自然资源与国土空间规划学]; 090105 [作物生产系统与生态工程];
摘要
Over the last century, humans from industrialized societies have witnessed a radical increase in some dental diseases. A severe problem concerns the loss of dental materials (enamel and dentine) at the buccal cervical region of the tooth. This "modern-day" pathology, called non-carious cervical lesions (NCCLs), is ubiquitous and worldwide spread, but is very sporadic in modern humans from pre-industrialized societies. Scholars believe that several factors are involved, but the real dynamics behind this pathology are far from being understood. Here we use an engineering approach, finite element analysis (FEA), to suggest that the lack of dental wear, characteristic of industrialized societies, might be a major factor leading to NCCLs. Occlusal loads were applied to high resolution finite element models of lower second premolars (P-2) to demonstrate that slightly worn P(2)s envisage high tensile stresses in the buccal cervical region, but when worn down artificially in the laboratory the pattern of stress distribution changes and the tensile stresses decrease, matching the results obtained in naturally worn P(2)s. In the modern industrialized world, individuals at advanced ages show very moderate dental wear when compared to past societies, and teeth are exposed to high tensile stresses at the buccal cervical region for decades longer. This is the most likely mechanism explaining enamel loss in the cervical region, and may favor the activity of other disruptive processes such as biocorrosion. Because of the lack of dental abrasion, our masticatory apparatus faces new challenges that can only be understood in an evolutionary perspective.
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页数:12
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