Qualitative and Quantitative Determination of Attrition and the Ensuing Tooth Migraton

Abstract

A s early :is 1879, Brocn proposed :I systeni for recording attri-(1 = no attrition 1 = attrition of the enamel only 2 = one or several islets of dentine visible, surrounded by enainel 3 = dentine visible on the whole occlusal surface i"1,'usure ;I produit uiie section coiiiplL:te de tout le fGt de 1:i dent.") 4 = the whole crown is \ w r n d o \ \ 7 1 1 :I$ far :is the neck. In his "I.echrbuc*h der AnthroyologiP" ,Il/rrfin (1928) used the Goldstein (1932 ) applied Hrdlickrr's clnssification, i.e. Slight we;ir = cusps showing :I mere sign of :ittrition hlodernte \\ear = dentine beginning to show Mediuni \ve:ir = dentine visible on the gre:iter p r t oC occlus:il hfarlted we:~r = :ill en:iniel on occlusal surface of tooth gone. I,ti!qh (1925) suggested the following c1ussific:ition; 1. Attrition of enamel of the cusps 2. Partial cuposure of the dentine 3. 'Tooth conrit1er;iblg reduced, with dentine Lisihle on t h c whole surface tion. His classification was the following; s;iiiie classificntion.sl1rf:Ice of toolh. l'llll) es]"'sed. I)civiesc t Pcdersrn ( 195.5) used :I soiiiew1i:rt simpler cl:i$si-0 = n o attrition 1 = iittrition of the en:iinel 2 = dentine yisihle 3 = exposure of the wcoiit1:iry tlentinc. fica tion, viz. Porpofie The 1)iirpose o l the prewnt investigation x i s ( A to c:irry out i i qi1:ilit:itive study of the attrition, and (13) to determine t h e iiiesio-dist:il decrease in tooth dimension produced by attrition and the ensuing tooth ~nigixtion if any. 'I'll e (1 ii e s t i o 11 s tle :i 1 t with :ire the f ol I owi n g ; Acta Odontol Scand Downloaded from informahealthcare.com by Queen's University on 01/05/15 For personal use only. t "0 ' X c t t Acta Odontol Scand Downloaded from informahealthcare.com by Queen's University on 01/05/15For personal use only.

Tooth wear and the ?design? of the human dentition: A perspective from evolutionary medicine

“…5,000 -2,500 years ago) (Nara et al, 1998). Although Lysell (1958a) reported that the tendency in medieval Swedish skulls was not statistically significant, a close examination reveals that his results do not provide clear evidence of the absence of mesial drift in the molars (P ϭ 0.05, one-tailed t-test, d.f. ϭ 28).…”

“…Although there is no corroborative evidence, most workers ascribe it to continuous lip tension counteracting continuous pressures from the tongue (Selmer-Olsen, 1937;Lysell, 1958a;Hylander, 1977;Frederick, 1991). Based on this concept, the following explanatory model can be formed: during development of the dentition, the protruding anterior teeth are in contact with their adjacent and/or opposing teeth in a form of scissors occlusion with no interproximal spaces (see "Anterior occlusion," below).…”

Dental arch dimensions and tooth wear in two samples of children in the 1950s and 1990s

“…11,39,41 Past investigations identifi ed a large amount of tooth wear in primitive populations, where the prevalence of malocclusions was lower when compared with current groups. 10,[42][43][44][45][46][47][48][49][50][51][52] Previous studies have shown an increasing prevalence for certain malocclusions in the past 30 years of last century. 5,6 The aim of this study was to test whether there has been a signifi cant increase or decrease in the amount of wear of deciduous teeth during the same period, due to an occlusal aspect, possibly correlated to malocclusions.…”

Odontometric study of African monkey teeth

“…1963], Investigation of the factors affecting crown size may also be complicated by the relationship with body size [Brace and Montagu, 1965;Lavelle Anderson and Thompson, 1973], although such a relationship has been denied by Bailit and F riedlaender [1966]. Attrition is another factor which complicates the investigation of crown size [Lundstrom, 1952], and attempts to correct for the loss of tooth substance due to attrition [Ashton and Zuckerman, 1950a;Robinson, 1956;Lysell, 1958] have yet to withstand critical analysis. Finally, the univariate statistical analysis of odontometric data is another feature which may inhibit the elucidation of the roles of genetic and en vironmental factors in crown size, since it enables only one or two tooth dimensions to be compared at any one time rather than the dentition as a whole [Potter, 1972].…”