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Results for “Tooth Abnormalities”

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At least 595 records · Page 33Linked to original sources
PubMed2004

Unusual case of labial and lingual talon cusps.

Talon cusp is an uncommon developmental anomaly affecting the anterior teeth, characterized by cusp-like projections, usually presenting on the lingual surface of the affected tooth. The occurrence ranges from 0.73% to 8% of the population. Talon cusp has been associated with other dental anomalies such as dens invaginatus, odontomas, and impacted teeth; associations with somatic anomalies such as Mohr's, Rubenstein-Taybi, and Sturge-Weber syndromes have also been reported. Only a few cases of labial talon cusp have been reported and only one previously published report exists documenting talons appearing both labially and lingually on the same tooth. This study reports the unusual case of a 10-year-old girl with bilateral talon cusps and one tooth possessing both lingual and labial talons. The lingual talon on the right maxillary lateral incisor was interfering with normal occlusion and was responsible for labioversion of the tooth. Treatment options were presented.

Child↗
PubMed1976

Fluorosis in black-tailed deer.

Marked dental disfigurement and abnormal tooth wear patterns were observed in black-tailed deer (Odocoileus hemionus columbianus) taken from an area near an industrial fluoride source in northwestern Washington. Fluoride levels in the bones of these deer were from 10 to 35 times higher than levels in the bones of normal animals. These levels are similar to those associated with fluorosis of cattle.

Animals↗
PubMed1998

Anomalous dental morphology and root resorption during orthodontic treatment: a pilot study.

The present study investigated the relation between anomalous dental morphology and root resorption during orthodontic treatment. One hundred and eleven sets of orthodontic records (a total of 1,630 teeth) were examined. Root resorption was determined from post-treatment panoramic radiographs using a five-grade quantitative measurement. It was found that patients with short or blunt roots before treatment underwent significant root shortening during orthodontic treatment. Patients with any one dental anomaly had a significantly higher degree of root resorption compared with patients with no dental anomaly. Invaginated teeth, teeth with thin or pipette-shaped roots and teeth with short or blunt roots were likely to be more susceptible to root resorption than those without such anomalies. Possible linkages between the aetiological factors of dental anomalies and the susceptibility to root resorption were discussed. The presence of anomalous dental morphology should be taken into account in orthodontic treatment planning.

Adolescent↗
PubMed1999

Taurodontism in association with supernumerary teeth.

The dental, radiological, genetic and dermatoglyphic findings of an additional patient with taurodontism in association with supernumerary teeth were presented and the findings of the patient were compared with those in the literature.

Adult↗
PubMedDate not supplied

Prevalence of pre-eruptive intracoronal dentin defects from panoramic radiographs.

PURPOSE: This investigation stemmed from preliminary clinical observations from a school dental clinic, which suggested that a proportion of clinically undetected, radiolucent lesions on radiographs may originate as pre-eruptive intracoronal dentin defects. This study investigated the prevalence of such defects in orthopantomograms from a group of children and young adults. METHODS: A total of 1281 orthopantomograms with 11,767 unerupted permanent teeth were examined. RESULTS: The prevalence of intracoronal dentin defects was 3% by subjects, and 0.5% by teeth; the highest prevalence being noted in the maxillary and mandibular first permanent molars. Most of the lesions occurred singly, and nearly half had extended to greater than two-thirds the width of dentin thickness. Ectopic positioning was significantly associated with this lesion. CONCLUSIONS: Pre-eruptive intracoronal dentin defects occur at a significant prevalence rate. Increased awareness of this entity may improve diagnosis and allow early treatment.

Chi-Square Distribution↗
PubMed1975

Gene-environment interactions during tooth development.

The nature of the interaction between the environment and the genetic information of the organism has been examined vis-a-vis the local tissue environments in which the teeth are initiated. The directive role of the dental connective tissue, the papilla, and sac in initiating the tooth bud, controlling its shape, and maintaining its differentiation emphasize the importance of the mesenchymal connective tissue elements of tooth buds. The molecular character of this tissue interaction was described and the role of collagen as a mediator of developmental information was stressed. Finally these data from experimental studies suggest that the etiology of ectodermal dysplasia and inherited diseases involving the dentition may involve the function of the connective tissue of the dintition.

Animals↗
PubMed1999

Dysosteosclerosis: a case with unique dental findings and SEM evaluation of a hypoplastic tooth.

A ten-year-old boy, who had the typical dental findings of dysosteosclerosis such as yellowish, hypoplastic teeth, retarded eruption, which upon eruption, decayed rapidly, is presented. To date this is the first known case reported with a congenital absence of the first permanent molars. Furthermore, SEM evaluation of the enamel and dentin was performed on a tooth from a patient with dysosteosclerosis for the first time. These studies showed weak ultrastructural compositions due to irregular calcification.

Anodontia↗
PubMed1998

Genetic analysis of dental traits in 82 pairs of female-female twins.

OBJECTIVE: To study systematically the heritability of dental traits. METHODS: Eighty-two pairs of female-female twins from 6 to 12 years old were collected. Twin zygosity diagnosis was made by DNA fingerprinting. The study was composed of questionnaires, oral examinations, model measurements, and panoramic radiographs. The same analytic method was used for each of the dental traits and comparison of their heritability was made. RESULTS AND CONCLUSIONS: According to the significance of difference and the level of heritability, the dental traits were divided into four types: strong, median, weak, and weaker heritability. The number of third molars present, tooth size, arch size, and upper lateral incisor malformation were under strong genetic influence; hypodontia indicated a median heritability; a weak heritability was seen in tooth eruption and caries, and a weaker heritability was found in occlusal traits. The division made it easy to learn the genetic characteristics of dental traits systematically and supplemented the theory of dental genetics.

Anodontia↗
PubMed1975

[Fibrous dysplasia and a cementofibroma in a child].

The authors present a case of odontogenic tumour occuring at birth. Its origin seems to be an early modification of the ectomesenchyme. The course of the disease may be followed by lines within the dentin traced by courses of tetracycline during the first few years of life.

Cementoma↗
PubMed1975

[Traumatic injury of a permanent tooth by forceps delivery (presentation of a case)].

A case of malformation of an upper central permanent incisor is described. From the history, it is assumed that the isolated malformation of the affected tooth, No. 21, may be due to indirect consequences of a birth trauma (forceps delivery). The problems of developing malformations connected with this case are discussed generally and specifically for a single tooth.

Birth Injuries↗
PubMed1975

[Studies of longitudinal section on jaw development and resulting conclusions for orthodontic treatment planning in the deciduous dentition].

From a 11 years' longitudinal study of the tooth development in 93 children conclusions are drawn as to the planning of orthodontic treatment in the deciduous dentition. In accepting the task of orthodontic treatment, the dentist assumes a very responsible function which he will only master if he knows the various patterns of dental development. The difficulties of a prognosis as to dental development in an individual child are exemplified by the evaluation of dental findings obtained at the different years of life.

Cephalometry↗