title: The evolutionary paradox of tooth wear: simply destruction or inevitable adaptation?
abstract: 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 (P2) to demonstrate that slightly worn P2s 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 P2s. 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.
authors: Department of Human Evolution, Max Planck Institute for Evolutionary Anthropology, Leipzig, Germany. stefano_benazzi@eva.mpg.de
authors: Stefano
authors: S
authors: Benazzi
authors: Huynh Nhu
authors: HN
authors: Nguyen
authors: Dieter
authors: D
authors: Schulz
authors: Ian R
authors: IR
authors: Grosse
authors: Giorgio
authors: G
authors: Gruppioni
authors: Jean-Jacques
authors: JJ
authors: Hublin
authors: Ottmar
authors: O
authors: Kullmer
mesh_terms: D000222:Adaptation, Physiological; D003198:Computer Simulation; D003766:Dental Occlusion; D003799:Dental Stress Analysis; D005260:Female; D006801:Humans; D008297:Male; D008954:Models, Biological; D013718:Tensile Strength; D014076:Tooth Diseases / Q000150:complications; D057085:Tooth Wear / Q000209:etiology* / Q000473:pathology
references: Dent Update. 2011 Nov;38(9):615-6, 619-20, 623-4 passim
references: 22238994
references: J Dent. 1994 Aug;22(4):195-207
references: 7962894
references: J Dent. 2006 Mar;34(3):185-94
references: 16112334
references: J Esthet Restor Dent. 2012 Feb;24(1):10-23
references: 22296690
references: Med Biol Eng Comput. 2009 Apr;47(4):367-74
references: 18679734
references: J Prosthet Dent. 2007 Aug;98(2):89-100
references: 17692590
references: J Dent Res. 1983 Feb;62(2):82-6
references: 6571871
references: J Esthet Dent. 1991 Jan-Feb;3(1):14-9
references: 1873064
references: Am J Phys Anthropol. 1999 Aug;109(4):485-99
references: 10423264
references: J Dent. 2007 Jan;35(1):28-35
references: 16782259
references: Aust Dent J. 2009 Mar;54(1):2-8
references: 19228125
references: Int J Prosthodont. 2009 Jan-Feb;22(1):78-86
references: 19260434
references: J Dent. 2008 Oct;36(10):759-66
references: 18656296
references: Am J Phys Anthropol. 2013 Feb;150(2):324-9
references: 23296796
references: J Oral Rehabil. 2012 Jun;39(6):450-62
references: 22435539
references: Dent Traumatol. 2010 Feb;26(1):64-9
references: 19843136
references: J Anat. 2011 Sep;219(3):259-72
references: 21615398
references: J Dent Res. 1983 May;62(5):562-5
references: 6573372
references: J Oral Rehabil. 2013 Jan;40(1):24-32
references: 22882712
references: J Prosthet Dent. 2005 Mar;93(3):221-6
references: 15775922
references: Arch Oral Biol. 2011 May;56(5):512-9
references: 21146152
references: J Prosthet Dent. 2000 Oct;84(4):436-43
references: 11044852
references: J Oral Rehabil. 2011 Feb;38(2):95-100
references: 20678102
references: Dent Mater. 2007 May;23(5):539-48
references: 16730058
references: Arch Oral Biol. 2010 Apr;55(4):294-9
references: 20197186
references: Am J Phys Anthropol. 2009 Aug;139(4):600-5
references: 19425091
references: Clin Oral Investig. 2008 Mar;12 Suppl 1:S21-6
references: 17938977
references: Proc Natl Acad Sci U S A. 2003 Apr 1;100(7):3874-7
references: 12634426
references: J Dent Res. 1993 Nov;72(11):1526-31
references: 8227704
references: J Dent. 2008 Oct;36(10):774-9
references: 18597913
references: Am J Phys Anthropol. 2003;Suppl 37:47-61
references: 14666533
references: J Dent Res. 2006 Apr;85(4):306-12
references: 16567549
references: Int Dent J. 2005;55(4 Suppl 1):268-76
references: 16167605
references: Int J Dent. 2012;2012:687058
references: 22216032
references: J Prosthet Dent. 1996 Feb;75(2):140-7
references: 8667271
references: Anat Rec (Hoboken). 2012 May;295(5):846-52
references: 22419654
references: J Coll Physicians Surg Pak. 2009 May;19(5):279-82
references: 19409158
references: Quintessence Int. 2006 Sep;37(8):613-9
references: 16922020
references: Int J Biomater. 2010;2010:
references: 20706535
references: J Dent Biomech. 2010;2010:902537
references: 20981154
references: Biol Rev Camb Philos Soc. 2011 Nov;86(4):959-74
references: 21507194
references: Am J Phys Anthropol. 2003 May;121(1):10-4
references: 12687578
references: Am J Phys Anthropol. 1984 Jan;63(1):39-56
references: 6422767
references: J Oral Rehabil. 1977 Jan;4(1):65-76
references: 265365
references: J Hum Evol. 2013 Feb;64(2):151-60
references: 23352561
references: Proc Natl Acad Sci U S A. 2009 May 5;106(18):7289-93
references: 19365079
references: J Oral Rehabil. 2005 Jul;32(7):504-10
references: 15975130
references: Dent Mater. 2010 Sep;26(9):e211-9
references: 20542552
references: J Prosthet Dent. 2010 Jan;103(1):6-12
references: 20105674
references: Am J Phys Anthropol. 2005;Suppl 41:96-117
references: 16369962
references: J Oral Rehabil. 2002 Feb;29(2):188-93
references: 11856399
references: J Biomech. 2009 Jul 22;42(10):1533-1538
references: 19446816
references: J Prosthet Dent. 1992 Sep;68(3):421-7
references: 1432755
references: J Prosthet Dent. 2008 Jul;100(1):1-10
references: 18589068
references: Am J Phys Anthropol. 2012 Jan;147(1):128-34
references: 21952986
references: J Esthet Restor Dent. 2009;21(5):324-34
references: 19796301
references: J Oral Rehabil. 1996 Apr;23(4):232-9
references: 8730269