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At least 19 recordsLinked to original sources
PubMed1977

Effects of occlusal attrition and continuous eruption on odontometry of rat molars.

Recurrent reports by others of posteruptive dimensional increase of the crowns of rat molar teeth were analyzed in the context of our present study of occlusal attrition, continuous eruption and alteration of the occlusal planes of rat maxillary molar teeth with age. Marked attrition of the anatomical crowns occurs, together with a considerable continuous eruption that increasingly brings the markedly convex mesial root of the maxillary first molar into the clinical crown. Further, a slight change in occlusal plane occurs. Previous workers used standardized planes of orientation and of registration prior to measurement, which masked the phenomena mentioned above. They thus mistakenly reported increased coronal dimensions.

Aging↗
PubMed1983

Dental morphology and odontometry of the Tibetan immigrants.

Dental features such as size, shape, cusp number and groove pattern, deflecting wrinkle, protostylid, form and size of dental arch and occlusion pattern, as well as crown diameters of maxillary and mandibular dentition of the Tibetan immigrants in India are described. Sex differences in various measurements are also noted. Overall reduction in size, presence of hypodontia of the third molar, and absence of Carabelli's trait are a distinct progressive/evolutionary trend in the Tibetan dentition, while presence of a shovel-shaped lingual surface of central and lateral incisors is a retrogressive/primitive condition. In some of the dental features Tibetans resemble Caucasoid and modern populations, in certain others they resemble other Mongoloid populations, and in still other features they resemble aboriginal populations and fossil hominids.

Cephalometry↗
PubMedDate not supplied

[Detection of significant gender differences by odontometry as illustrated by a representative group from Lebanese (East-Mediterranean) population].

This study was conducted on a sample of the Lebanese population. Its aim was to verify differences in dental dimensions between the genders as was found by other authors in other populations. It is concluded that gender dental differences constitute an additional important, though not-decisive element, in identification of courpses.

Adolescent↗
PubMed1990

[Study of pain sensitivity based on the indicators of electro- odontometry in patients with depersonalization and depressive disorders].

Electroodontometry was used to examine the pain threshold and sensation threshold in patients with depersonalization, endogenous depression and in mentally healthy test subjects. The strongest differences in the thresholds were found on the anterior teeth. The patients with depersonalization manifested a considerable rise of the sensation threshold and to an ever greater degree of the pain threshold. In patients suffering from endogenous depression, both thresholds were decreased and coincided almost completely. It is likely that this fact is associated with a relatively higher incidence of the painful syndrome in patients suffering from depression.

Adolescent↗
PubMed1993

Odontometry and biological affinity in south Asia: analysis of three ethnic groups from northwest India.

Current knowledge of odontometric variation among the people of south Asia is limited, yet variation in tooth size has the potential to answer important questions regarding genetic relationships among contemporary social groups. Here, we report tooth crown diameters for 3 ethnic groups (Bhils, Garasias, Rajputs) from Gujarat State and contrast these data with 10 social groups from north, northwestern, northeastern, west-central, and south India. Univariate descriptive and inferential statistics are presented by group and by sex. Examination of crown diameters demonstrates that tooth size differs significantly between social groups in Gujarat. Cluster analysis of sex-standardized odontometric mean parameter values indicates that in apportionment of tooth size throughout the dentition low-status Garasias are slightly more similar to tribal Bhils than they are to high-status Rajputs. Principal components analysis by sex identifies three components that together account for 58.2% and 56.3% of the total variance among Gujarati females and males, respectively. These components are identified as overall size, a dimensional contrast between mesiodistal diameters and buccolingual diameters, and a dimensional contrast between mesiodistal diameters and buccolingual diameters among anterior teeth coupled with a contrast between anterior teeth (incisors, canines) and posterior teeth (premolars, molars). Ordination of group component scores indicates that (1) males and females of each social group exhibit a pattern of tooth size apportionment most similar to the opposite member of that same social group and (2) low-status Garasias exhibit a tooth size apportionment profile intermediate between tribal Bhils and high-status Rajputs. To place this pattern of odontometric variation among modern Gujaratis in larger perspective, data from Gujarati males were contrasted against males from 10 social groups from north, northwestern, northeastern, west-central, and south India. Cluster analysis of group-standardized odontometric mean parameter values indicates that (1) Gujarati social groups, regardless of social status or caste adherence, are more similar to one another than to any other group included in this analysis and (2) Gujarati social groups share closet affinities with geographically proximate social groups (Ahirs, Jats, Kunbis). Principal components analysis yields three components that combine to explain 64.0% of the total variance. These components are interpreted as a dimensional contrast among posterior teeth, a dimensional contrast among nonmolar teeth, and a contrast between anterior and posterior teeth. Ordination of group component scores indicates that tribal Bhils possess tooth size apportionment profiles that are different from other Indian tribal groups but are proximate to those found among Gujarati Hindu groups.(ABSTRACT TRUNCATED AT 400 WORDS)

Adolescent↗
PubMed1993

Odontometry of Lithuanian paleopopulations.

In 3443 teeth of 418 adults (224 males, 194 females) from Lithuanian crania of the 1st and 2nd millennia A.D., vestibulolingual (VL) and mesiodistal (MD) diameters of each tooth were measured on the right side. The samples showed a marked stability during the millennia, measurements being typical for a mesodontic population. Definite sexual dimorphism of teeth measurements was established. A method for sex estimation from dental measurements is proposed.

Female↗
PubMedDate not supplied

[A comparative study of the effectiveness of the analgesic effect of electropuncture stimulation and nonnarcotic analgesics in therapy patients in an emergency dental care office].

Analysis of patients' subjective sensations, of rheography and electro-odontometry data has lead the authors to a conclusion that the analgesic effect of rengasil was higher than that of ibuprofen and that rengasil combination with electropuncture was still more effective. The analgesic effect was the most marked in alveolitis and periodontitis, less so in inflammations of the pulp, and no effect could be achieved in acute purulent pulpitis. The authors suppose that pain syndrome alleviation after electropuncture stimulation and after administration of anti-inflammatory drugs is explained mainly by changed hemodynamics at the site of inflammation, this resulting in reduction of the edema and in diminished effects of biochemical substances released in the course of inflammation.

Acupuncture Points↗
PubMedDate not supplied

[Thresholds of the electrical excitability of the pulp in various groups of teeth and their changes under the influence of analgin, amidopyrine and diazepam].

Pulp electric excitability thresholds in different teeth groups and their changes under effects of analgin, amidopyrin and diasepam were studied using electro-odontometry in 58 patients and in experimental recordings of neuronal activity in rostral part of trigeminal complex under electrostimulation of molar and fang teeth. Baseline thresholds of pulp stimulation proved different in anterior teeth group and premolar/molar group. Analgetic drugs used had more pronounced effect in cases of molar pulp stimulation.

Adolescent↗
PubMed1997

Dental asymmetry, maternal obesity, and smoking.

This study examines the levels of fluctuating dental asymmetry in four samples of school children: those whose mothers were obese and had smoked during the pregnancy concerned (n = 111); those whose mothers were obese non-smokers (n = 114); those whose mothers were non-obese smokers (n = 104); and those whose mothers were lean non-smokers (n = 111). The degree of fluctuating asymmetry was assessed by means of a rescaled asymmetry measure. Obesity was defined as Quetelet's index in excess of 30, and smoking status as at least 20 cigarettes per day during the pregnancy concerned. When the magnitudes of fluctuating asymmetry in children of lean smokers were compared to the control group of lean non-smokers, no significant univariate differences were found. Children of obese mothers, whether these smoked or not, were found to have significantly raised levels of asymmetry. An analysis of variance confirmed that the combination of obesity and maternal smoking was a significant predictor of fluctuating dental asymmetry. The teeth involved tended to be the maxillary first incisor and molars. It is concluded that maternal obesity has a destabilizing effect on the developing fetus and that this effect appears to be enhanced in obese mothers who smoked. This effect was absent in lean mothers, irrespective of their smoking status.

Adolescent↗
PubMed1977

Development and size of the teeth of Macaca mulatta.

A cross-sectional sample of 151 skulls from Macaca mulatta of known age and similar rearing in U.S. Primate Centers was analyzed to determine age-related "norms" of stages of development and size of teeth. The stages of development from the follicle of a deciduous incisor in the fetus to completion of the root with apex closed of the permanent third molar were related to age. The age range observed for eruption of each tooth was noted and related to its stage of development. The crown of each erupted tooth was found to be completely developed, but growth of its root continued for a longer, indeterminate period. When a deciduous tooth was exfoliated, the crown of the permanent successor was found to be completed and root growth had begun. Measurements of both mesiodistal and faciolingual diameters and of crown length of the teeth in situ and of total length and root length on roentgenograms were examined for sexual dimorphism. The faciolingual diameter of the deciduous mandibular second incisor and of both second molars showed the greatest sexual dimorphism among both diameters of all deciduous teeth. The mesiodistal and faciolingual diameters of the mandibular premolars were found to be the best dimensions in discriminant functions for identifying sex in the absence of permanent canines.

Age Factors↗
PubMed2004

Relationships between the fossil colobine Mesopithecus pentelicus and extant cercopithecoids, based on dental metrics.

Maxillary dental measurements from six specimens of Mesopithecus pentelicus, 64 cercopithecines, 59 African colobines, and 64 Asian colobines were analyzed by means of a "nested research design" that was specifically designed to explore the affiliation between fossils and extant cercopithecoids at different systematic levels. The results showed that the variation among taxonomic groups was mainly associated with size; however, in addition, interesting shape differences emerged, molars were shown to be important discriminators, Mesopithecus was confirmed as a colobine (as expected) and found to be closer to Asian species than to African ones, and the odd-nosed colobines were found to share more dental similarities with Mesopithecus than other colobines. The last finding is in contrast to previous studies, in which it was proposed that M. pentelicus is morphologically closely related to the African colobus and the gray langur (Semnopithecus).

Africa↗