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Results for “TOOTH ABRASION”

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At least 1,531 records · Page 85Linked to original sources
PubMed1979

The incidence of osteo-arthritis of the temporomandibular joint in various cultures.

Three hundred and forty-eight cranial remains from Bronze and Iron Age British, Romano-British, Anglo-Saxon, Eastern Coast Australian aborigines, Medieval Christian Norse, Medieval Scarborough, 17--20th century British and German cultures, were examined for the presence of osteoarthritis in the temporomandibular joints. Cultures exposed to more stringent living conditions and with well-worn teeth had about twice the incidence of osteo-arthritis as the more sophisticated cultures. In general, loss of either molar support or occlusal imbalance were potent aetiological factors in this disease.

Adolescent↗
PubMed1991

Bruxism.

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Bruxism↗
PubMed1978

Mecrowear of mammalian teeth as an indicator of diet.

Microwear details on teeth of two sympatric species of hyrax are correlated with major dietary differences observed in the wild. Grazing (Procavia john-stoni) and browsing (Heterohyrax brucei) species can be distinguished. The results show that diets of extinct species may be deduced from tooth microwear.

Animals↗
PubMed1975

Incisor size and diet in anthropoids with special reference to Cercopithecidae.

In 57 species of anthropoids relative size of incisors in highly correlated with diet. Anthropoids that feed primarily on large food objects (large fruits) have larger incisors than those that feed on smaller food objects (berries or leaves). This difference reflects a need for more extensive incisal preparation of larger food objects before mastication. Extensive incisal preparation causes increased tooth wear, therefore, enlarged incisors are probably an adaptive response to increase their wear potential.

Animals↗
PubMed1975

Atrophic rhinitis of pigs: abattoir studies.

The snouts of 2701 pork, bacon and heavy pigs killed at five abattoirs in England and Scotland during March to July 1974 were examined for evidence of atrophic rhinitis. Lesions were graded 1 to 5 according to severity. Suspicious lesions were present in 75-7 per cent of the sample. There was obvious atrophy of the turbinates in 44-7 per cent (grade 2 to 5) and severe atrophy in 17-5 per cent (grades 3 to 5). Foreign bodies were found in or between the posterior cheek teeth of 5-3 per cent of the sample. There was frequently an associated gingivitis. Other lesions seen included black discolouration of the teeth, severe tooth wear and osteoarthrosis of the temporomandibular joint. It was concluded that the incidence of atrophic rhinitis could have increased markedly since the last survey of the United Kingdom was undertaken in 1956/57 and some form of disease-monitoring service was urgently needed.

Abattoirs↗
PubMed2006

Accuracy and consistency of the visual diagnosis of exposed dentine on worn occlusal/incisal surfaces.

Most indices for the assessment of wear of various aetiologies include the distinction between 'enamel still present' and 'dentine exposed' for grading. Since the visual diagnosis of exposed dentine has not yet been validated, the present study is a first attempt to investigate its accuracy and consistency. Sixty-one examiners (23 scientists, 18 university dentists and 20 dental students) were asked to diagnose 49 tooth areas with different grades of wear and to decide whether dentine was exposed (positive test) or not (negative test). Afterwards, the teeth were histologically evaluated. In 44 areas, dentine (also in all cases with minor wear) was exposed, and in 5 areas enamel was present. Overall sensitivity was 0.65, specificity 0.88 and the proportion of correct diagnoses was 0.67. The diagnosis 'dentine is exposed' was about 5 times as likely and the diagnosis 'dentine is not exposed' half as likely to come from an area with exposed dentine than from an enamel-covered area. The closeness of the visual diagnosis to the histological findings was only fair (kappa=0.27), no significant impact of professional experience was found. For inter- and intra-examiner agreement, kappa was 0.28 and 0.55, respectively. It was concluded that the diagnosis of exposed dentine is difficult.

Dental Enamel↗
PubMed1990

A comparison of the position of the mental foramen in Chinese and British mandibles.

The antero-posterior position of the mental foramen was studied in 68 Chinese and 44 British skulls of known or calculated age at death. All skulls showed low pre-mortem tooth loss and had a good occlusion. The position of the foramen was related to the body of the mandible as well as to the standing mandibular teeth using two previously published methods. There was no significant difference in the size of the Chinese and British mandibles. There was a significant difference between the two groups when measurements relating the foramen to the body of the mandible (symphysis menti) were considered, the foraminal position being more distal in the Chinese group. The modal position of the foramen in the Chinese sample was along the long axis of the second premolar, whereas in the British sample it lay between the apices of the first and second premolar. The foraminal position apparently moved distally in both groups with age and this was likely to be associated with mesial tooth drift and age-related attrition.

Adolescent↗
PubMed1992

The mandible--an analysis.

In this study, an attempt has been made to examine and analyse the ancient mandibles of people who have died several hundreds of years ago during the second and first millenium B.C. These mandibles have been recovered from the burial mounds in Bahrain (Arabian Gulf) and preserved in the National Museum and the Department of Antiquities in Bahrain. The dental conditions recorded are e.g. attrition, caries, fluorosis, periodontitis or antemortem tooth loss. The results indicate the age, sex, diet, occupation and environmental conditions that existed and even the culture of the people. A comparative study of the ancient mandibles and those of the present generation has been carried out.

Adult↗
PubMed1976

New adapid primate of European affinities from Texas.

The primate Margarita stevensi n. gen. and n. sp. is described from late Eocene sediments of Texas, North America. The crushed skull of the type specimen is in the size range of Lepilemur leucopus, and the most recent relative of the new form appears to be the middle Eocene European adapid Europolemur klatti from the Geiseltal localities of the DDR. There are no indications that Margarita is closely related to the notharctine adapids. The new primate suggests that the Eocene of eastern North America was the homeland of lemuriforms with close European phylogenetic affinities. The posteriorly directed foramen magnum indicates a relatively small brain size and the dentition suggests an insectivorous-carnivorous dietary regime.

Animals↗