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At least 235 records · Page 13Linked to original sources
PubMed1978

Evaluation of autotransplantations of completely developed maxillary canines.

Transplantation of 28 maxillary canines was followed up in 22 patients with an average age of 25.2 s.d. 9.9 years. The root was fully developed. The mean immobilization time was 6.6 weeks and the mean follow-up period 17.8 months. Results seemed to be better in the age group of 13--20 years than in 21--30 and 31--47 years. Statistically significant better results were found in the youngest than in the older groups in the return of vitality, vertical bone resorption, periodontal space in the lamina dura. Four of the 28 teeth were extracted because of great mobility caused by poor bone regeneration and vertical resorption of the alveolar bone: three in the middle age group and one in the oldest. Pulp extirpation was performed on nine teeth: six in the oldest group and three in the middle group. Vitality returned in only three teeth, all of which belonged to the youngest group. Root resorption was observed in all age groups; in 76% of the cases it occurred in the apical third, and was generally inflammatory. The causes of the failure of transplantation were considered to include damage of the transplant during removal from deep palatal malposition, poor regeneration of the bone around the transplant and chronic periodontal infection. The prognosis for transplantation was found to be fairly good for patients under 20 years of age but poorer for older age groups.

Adolescent↗
PubMed1979

Radiographic findings in 224Ra-caused dental resorptions.

Dental resorptions as a delayed effect of Thorium X (224Ra) were observed in four patients. The radiographic findings showed distinct and representative patterns. Apparently, the observed changes are typical for delayed alterations related to 224Ra-specific disturbances in the alveolar process. Degenerative and inflammatory reactions may also be involved in the pathogenesis.

Adult↗
PubMed1999

Intraosseous leiomyoma of the mandible.

An intraosseous leiomyoma arising within the mandible was diagnosed in a 24-year-old woman. Clinically, a nodular swelling of the lower border of the mandible was noted. Radiographically, a unilocular ellipsoid radiolucency, loss of the lower border of the mandible, and tooth resorption were observed. The mitotic count was 0.4 per 10 high-power fields, which supported the benign nature of the tumor. The clinical and histologic parameters for distinguishing between benign and malignant smooth muscle neoplasms are discussed.

Adult↗
PubMed2001

Pathology of the desmoplastic ameloblastoma.

Desmoplastic ameloblastoma is a rare variant of ameloblastoma and only 54 cases have been previously reported in the English literature. We report ten cases of desmoplastic ameloblastoma of the jaw observed between 1972 and 1998 and discuss the pathogenesis of the tumor. Eight of the ten tumors were located in the anterior region of the jaw. Radiographically, six cases showed mixed radiolucent/radiopaque appearance with ill-defined margins and the other four cases lacked typical findings of ameloblastomas. The tumors were located mainly in the alveolar region and occupied the tooth-bearing area, without tooth resorption or impacted teeth. Histologically, the desmoplastic ameloblastomas were characterized by extensive stromal desmoplasia, and small tumor nests of odontogenic epithelium were scattered in the stroma. Oxytalan fibers stained by potassium monopersulfate-aldehyde fuchsin were demonstrated in the stroma of all desmoplastic ameloblastomas. From these findings, we presumed that the desmoplastic ameloblastomas might have developed in the periodontal membrane.

Adolescent↗
PubMed1990

Short root anomaly.

A case of generalised short root anomaly is described. All permanent teeth had abnormally short roots, associated with microdontia, hypodontia and a dens invaginatus. Members of the patient's family were similarly affected.

Adolescent↗
PubMed1986

The significance of coronal growth of periodontal ligament tissue for new attachment formation.

The present study was designed to examine whether coronal growth of granulation tissue originating from the periodontal ligament is a prerequisite for new attachment formation. In each of 4 monkeys, 1 central incisor and 2 first molars in the maxilla and the mandible were selected for experimentation. Angular bony defects were surgically produced to the mid-root level around each single root after crown resection and root separation of the multirooted teeth. The periodontal ligament tissue and the root cementum were removed to the bottom of the bony defects. In half the number of the teeth, an elastic ligature was placed tightly around each root at the bottom of the defects (test roots). In the remaining teeth, an elastic ligature was placed loosely around each root at the same level (control roots). All roots were subsequently covered by laterally displaced flaps. After 3 months of healing, the animals were sacrificed and the jaws removed and placed in fixative. Following decalcification, histological sections of the experimental roots and their surrounding periodontal tissues were produced. The histological analysis disclosed that new attachment had former to a level coronal to the elastic ligature in 10 of 14 control roots but in only 1 of 18 test roots. The results indicate that the repopulation of a detached root surface by cells from the periodontal ligament is a prerequisite for new attachment formation.

Animals↗
PubMed1997

Pulp calcifications in traumatized primary incisors. A morphological and inductive analysis study.

The purpose of this study was to investigate histopathological changes in primary teeth following trauma, and to look for possible correlations between the morphology of pulpal calcification and clinical findings. The material consisted of 123 primary teeth from 98 Danish children aged 9-108 months (mean age 33.5 +/- 19.7 months) at the time of injury. The specimens were analyzed by means of light and scanning and transmission electron microscopy. Data from the clinical investigation and from predetermined ranked parameters from the histological analysis were processed in a computerized inductive analysis program. The results, describing patterns of co-variation, are presented as a decision tree. The most common diagnosis was intrusion luxation (54%). In 41% of all teeth, the degree of obliteration was less than 1/4 of the pulpal lumen. In most cases (79%), no denticles were visible. When present, 80% of the denticles had a bone-like appearance. Tissues occluding the pulpal lumen were either dentin-like (49%), bone-like (19%), or fibrotic (9%). It could be concluded that these varying responses could not be correlated with explicit clinical diagnoses. However, in certain combinations, histological parameters could be correlated to clinical findings.

Bone and Bones↗
PubMed2006

Traumatic intrusion of permanent teeth. Part 1. An epidemiological study of 216 intruded permanent teeth.

An epidemiological study of traumatic intrusion of permanent teeth was performed on 216 teeth in 151 patients treated over a 50-year period at a major trauma center in Denmark (Copenhagen). This analysis showed that intrusion of permanent teeth was of rare injury only affecting 1.9% of traumatic injuries involving permanent teeth. The main etiologic factor appeared to be falling which resulted in axial impacts on maxillary or mandibular teeth. The most common injury patterns were intrusion without additional injuries (33.5%) and intrusion with crown fractures (60.5%). A few cases were combinations of intrusion and either crown/root-fractures or root fractures (6%). Most often one tooth was intruded (46.3%), followed by two teeth (32.4% ) and three or more teeth (21.3%). The majority of intruded teeth were displaced 2-8 mm. The age group of 6-12 years of age was most frequently involved and boys appeared to experience intrusion injuries more frequently than girls, and at an earlier age. Maxillary central and lateral incisors are the primary victims of intrusions and this seems to be identical to other trauma types and is possibly related to the known exposure to impacts of maxillary incisors. The reliability of clinical findings, such as lack of mobility (81.8%), metallic percussion tone (72.5%), and no pain to percussion (66%) was reasonably high, whereas a radiographic feature such as the obliteration of the periodontal ligament space appeared to be only a partly reliable diagnostic tool (52%).

Accidental Falls↗
PubMed1977

Histology of external and internal resorption.

Seven cases of resorption in teeth have been described. Three had large internal cavities penetrating the dentine to or from the exterior. One had internal resorption in two separate locations and another had internal resorption which may have been precipitated by carious involvement of the pulp. Two cases of external resoprtion were quite dissimilar, one possibly a reaction to canal infection, the other idiopathic. Various types of calcified material were found in the areas of resorption and odontoclasts were found in one case.

Adolescent↗
PubMed1982

Development of deciduous and permanent dentition in Tarsius and its phylogenetic significance.

The earliest stages of development and differentiation of deciduous and permanent teeth were studied in prenatal and perinatal tarsiers. Both deciduous and successional teeth develop at loci for I1, I2, C, P2-4. Relationships among the dental lamina, enamel organs, and successional lamina were used to determine tooth homologies. During the second half of prenatal life, dP2 and dI2 undergo abnormal development. Their dentin becomes fragmented, and these teeth are shed or resorbed without eruption during the perinatal period. Our study provides evidence of an intermediate phase in evolutionary tooth loss. These findings do not corroborate recent hypotheses of primate phylogeny based mainly on tooth eruption patterns.

Animals↗