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PubMed1989

Proton microprobe determination of fluorine profiles in the enamel and dentine of erupting incisors from sheep given low and high daily doses of fluoride.

Developmental defects in incisors were induced by daily oral ingestion of sodium fluoride solutions. Teeth extracted at eruption from sheep that had been subjected to four different fluoride regimens--0.2 or 0.5 mg F/kg body weight daily for 6 months, 2 or 6 mg F/kg body weight daily for 21 days--were analysed for fluorine by gamma emission using a proton microprobe. Calcium and zinc profiles were also measured using proton-induced X-ray emission. Diffuse opacities, similar in appearance to mild human fluorosis, were produced by the first two regimens, whereas the last two produced hypoplastic lesions. Different distributions of fluoride were found in the unerupted enamel and dentine, and these patterns reflected variations in both the duration and concentration of the fluoride dose used to induce the fluorotic lesions.

Animals↗
PubMed1998

A study of the validity of a simulation of third molar eruption based on Markov modelling.

PURPOSE OF INVESTIGATION: The study was undertaken to examine the extent to which a model based on a Markov modelling process would simulate the eruption of lower third molars. BASIC PROCEDURE: A Markov process model was developed to model eruption of lower third molars using a 1-year time increment based on simulated eruption data relating to 100 lower third molars. This model was tested using a Monte Carlo simulation and compared with eruption patterns of 973 actual lower third molars. Statistical analysis of the differences between the simulated and actual groups was undertaken. MAIN FINDINGS: There were no differences between the simulated and actual data other than for the subgroup aged 30-34 where the simulation overestimated the probability of parteruption and underestimated the probability of uneruption and full eruption. PRINCIPAL CONCLUSIONS: This methodology produced an accurate model that may be of use in service planning.

Adolescent↗
PubMed1987

Radiographic localization of unerupted teeth in the anterior part of the maxilla: a survey of methods currently employed.

The radiographic prescribing habits of consultants in orthodontics and oral surgery are described with specific reference to assessment of unerupted maxillary canine teeth. Orthodontists use more radiographs than oral surgeons under these circumstances. The relative radiation for commonly used combinations of radiographs has been summarized and recommendations made regarding the use of certain of these.

Cephalometry↗
PubMed1993

Radiological findings in edentulous Kenyan patients.

Seven hundred and seventy five files of edentulous patients seen at the Department of Dental Surgery, University of Nairobi were scrutinized for the presence or absence of routine radiographs prior to treatment. 180 (23.2%) had radiographs. 26% of the radiographs had 51 positive radiological findings. 17.3% were roots, 3.9% were unerupted teeth, 6.7% were radiopacities and 0.6% were radiolucencies. 52.9% of the radiological findings were in the mandible and 47.1% were in the maxilla. In the mandible, 44.4% of the radiological findings were in the anterior region and 55.6% were found posteriorly. 66.7% of the maxillary radiological findings were in the anterior region and 33.3% were found posteriorly. Since some of the positive radiological findings such as the retained roots and unerupted teeth might lead to infection, cysts or poor dentures fit, it is recommended that whenever possible, all edentulous patients be examined radiographically prior to treatment.

Adult↗
PubMed1991

Location of abnormalities in panoramic radiographs of edentulous patients.

A series of 308 panoramic radiographs of edentulous patients was examined for the presence of pathoses to determine whether any predictive basis could be found for occurrence of abnormalities by sex, age, or location. Radiolucencies, radiopacities, and retained roots and teeth were recorded by size and by anterior or posterior location in edentulous jaws. Radiopacities were the most frequently found abnormality (18% of subjects), followed by retained roots (8%), radiolucencies (3%), and retained teeth (3%). No significant correlation was found by chi-square test between type or location of abnormality and sex of the patient. There was, however, a significant relationship between location and type of abnormality. Radiopaque and radiolucent lesions were more frequently found in the mandible, and unerupted teeth and retained roots were more frequently seen in the posterior maxilla. Selective radiographs to detect retained roots and unerupted teeth in the posterior maxilla may be most productive in terms of prosthodontic treatment outcome. Otherwise, this study finds no basis for selection of intraoral sites for specific intraoral radiographs of asymptomatic edentulous patients.

Aged↗
PubMed2000

Esthetic management of an unerupted maxillary central incisor with a closed eruption technique.

In cases of orthodontic traction of unerupted teeth, gingival recession and long clinical crowns are often seen. Satisfactory esthetic demands are not always met. A case of an unerupted maxillary central incisor is presented, in which traction was used, with emphasis on the surgical technique and the direction of the pull. The result was clinically favorable. The appearance of gingival margin was restored.

Child↗
PubMed2006

Dilacerated unerupted central incisor: A case report.

Dilaceration of permanent successors is one of the most common complications of trauma to the deciduous teeth. It is advisable to keep these patients under observation post-trauma and to consult an orthodontist at an early stage to prevent unfavorable sequelae. Presented here is a typical case of dilaceration.

Child↗
PubMed1983

Proliferation of pulpal tissues following early transplantation of developing teeth.

The responses of pulpal tissues were assessed histologically in teeth that had been transplanted as soon as crown formation was completed. The teeth were unerupted at the time of surgery and were transferred to other bony crypts, where attempts were made to reproduce their natural alignment. The pulpal tissues remained viable, although variations occurred in cellularity, vascularity and texture. There was widespread production of intrapulpal bone and osteodentine, and confluence of these tissues with proliferating apical and adjacent bone often resulted in ankylosis. The view was supported that transplanted dental tissues have a strong likelihood of surviving if the procedure is undertaken relatively early during tooth development; however, structural variations and ankylosis may compromise their subsequent value.

Animals↗
PubMed2001

Odontoma-producing intraosseous calcifying odontogenic cyst: case report.

The present report describes a case of odontoma-producing intraosseous calcifying odontogenic cyst in a 36-year-old Black male in the right mandibular bicuspid region. The lesion involved an unerupted permanent canine, which was displaced to the mandible base and a calcified mass that was later recognized as an odontoma. The lesion was surgically removed.

Adult↗
PubMed1989

The eruption of third molars in adults: a 10-year longitudinal study.

Among 829 participants of the Veterans Administration Dental Longitudinal Study examined over four triennial cycles, 97 persons (11.7%) had one or more unerupted third molars, for a total of 151 teeth, when the study was initiated. During the first 10 years of the study, 10 subjects had 14 unerupted third molars extracted, while in 10 persons 11 third molars erupted. Four of the latter persons each had one third molar removed subsequent to eruption. Three of the 11 erupted third molars were in functional occlusion. The position of 4 of the 11 "erupting" third molars appeared to remain unchanged relative to radiographic landmarks. Thus, their apparent clinical eruption may have been due to a reduction in the level of the gingival tissue in the area distal to the second molar tooth in association with periodontitis. The eruption of third molars in older adults appears to be a more frequent phenomenon than was previously recognized. Most erupting third molars had some associated pathologic condition, including caries and periodontitis.

Adult↗
PubMed1987

[Isolation of a phosphoprotein from preeruptive dentin from molars of domestic pigs (Sus scrofa domesticus)].

Isolation of a phosphoprotein from dentin of pre-eruptive molars of Sus scrofa domesticus. A protein with a relative molecular mass of 60,000 kD was isolated from dentin of unerupted pig molars. The electrophoretically homogeneous protein was identified as phosphoprotein with a specific staining procedure. The phosphorylation degree is 75%. The amino-acid composition and the molecular mass were compared with values of other species.

Animals↗
PubMed1994

[Combined epithelial odontogenic tumor].

The "combined epithelial odontogenic tumor" in an uncommon lesion characterized by the synchronous presentation of typical histological feature of the adenomatoid odontogenic tumour, and the Pindborg's tumor. In this work, the authors, describe a case of combined epithelial odontogenic tumor associated with an unerupted maxillary central incisor. The clinical and histological characteristics of this lesion point out that it could be primitively an adenomatoid odontogenic tumor, with several areas of calcifying epithelial odontogenic tumor.

Adult↗
PubMed2005

Relationship between the presence of unerupted mandibular third molars and fractures of the mandibular condyle.

Previous studies have shown that the presence of unerupted mandibular third molars predisposes the mandible to angle fractures. This study attempted to relate the presence of unerupted mandibular third molars with the incidence of condyle fractures. The authors compared the proportion of fractures in 439 patients who had unerupted third molars or no unerupted third molars. Fractures at the condylar region showed a significantly higher incidence in patients without unerupted third molars than in those patients with unerupted third molars. This study provides solid clinical evidence to suggest that the removal of unerupted mandibular third molars predisposes the mandible to condyle fractures.

Adult↗
PubMed1987

Incisor resorption caused by maxillary cuspids. A radiographic study.

A detailed radiographic study of 46 cases of maxillary incisor resorption related to unerupted cuspids finds most resorption in midroot, with about half on labial or lingual surfaces where it was not detectable on periapical radiographs. Resorption appears early, making it desirable to evaluate cuspid position no later than 10 or 11 years of age.

Adolescent↗
PubMed2005

Osteopetrosis--a review and report of two cases.

We present a brief review of the rare condition of osteopetrosis together with two case reports of this disease in the same family affecting the jaws. The first in a 41-year-old woman, and the second in her 39-year-old brother. Plain films and computed tomography showed marked sclerosis of the affected bones with obliteration of the medullary cavities and thickening of the cortices as well as multiple absent and unerupted teeth. In addition radiographs showed discrete mixed radiopaque/radiolucent areas consistent with the appearance of fibro-cemento-osseous dysplasia, but which may also represent part of the overall spectrum of bone changes in osteopetrosis.

Adult↗
PubMed1991

Dental pulp lipids from Bos taurus during odontogenesis.

During the fetal development of the dental pulp, the various lipid classes show no substantial differences in their relative ratios but differences occur between deciduous and permanent teeth. By chromatography, the amount of free cholesterol was found decreased in deciduous and permanent teeth as compared to fetal teeth. Esterified cholesterol increased in permanent teeth and triglyceride levels were high only in developing permanent teeth. Phosphatidylcholine, sphingomyelin and phosphatidylserine were present in higher concentration in permanent unerupted teeth, while phosphatidylethanolamine was at first constant but then decreased during development in the permanent unerupted teeth. These data suggest that lipid changes are related to the assembly of plasma membranes and to the establishment of the innervation during ontogeny and postnatal development of dental pulp.

Aging↗