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At least 181 records · Page 10Linked to original sources
PubMed1996

Preliminary examination of non-occlusal dental microwear in anthropoids: implications for the study of fossil primates.

Most studies of microscopic wear on non-human primate teeth have focused on the occlusal surfaces of molars. Recent analyses of the buccal surfaces of human cheek teeth have demonstrated an association between diet and dental microwear on the these surfaces as well. In the current study, we examine microwear on both the buccal and lingual surfaces of non-human primate molars to assess the potential of these surfaces to reveal information concerning anthropoid feeding behaviors. We compare frequency of microwear occurrence in 12 extant and 11 fossil anthropoid species. Among the living primates, the occurrence of microwear on nonocclusal surfaces appears to relate to both diet and degree of terrestriality. The implications of this research for the inference of feeding behaviors and substrate use in fossil cercopithecoids are discussed.

Analysis of Variance↗
PubMed1980

Effect of an autopolymerizing sealant on viability of microflora in occlusal dental caries.

A total of 106 molars with occlusal caries were sealed with an autopolymerizing sealant. Samples of the carious dentin were obtained 1, 3, 7, 14 and 28 d, and 2, 4, 6, and 12 months after sealant placement. The samples were cultured on enriched nonselective medium, a streptococcal medium, a Streptococcus mutans medium, and a medium for acidogenic microorganisms. The bacterial counts were compared with control samples obtained from nonsealed occlusal carious lesions, half of which had acid conditioner applied to the occlusal surface for 1 min prior to sampling. The mean total viable counts decreased by approximately 99.9% during the 1-year study period, from 925.1 x 10(4) CFU/mg of sample to 0.9 x 10(4) CFU/mg of sample. Statistically, there was a very strong linear relationship (P less than 0.001) between the reduction in bacterial counts and time. A similar reduction was observed for the total streptococcal count and the S. mutans count. The etching procedure itself reduced the number of cultivable organisms by about 75%. Sealant material that was polymerized directly in culture media did not result in any inhibition of bacterial growth. Although slight fluctuations in the relative proportion of the microflora were observed at the different sampling intervals, there were no significant changes in the relative distribution of bacterial types with time.

Acid Etching, Dental↗