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At least 1,531 records · Page 85Linked to original sources
PubMed1984

Dental and maxillofacial abnormalities in long-term survivors of childhood cancer: effects of treatment with chemotherapy and radiation to the head and neck.

Sixty-eight long-term survivors of childhood cancer were evaluated for dental and maxillofacial abnormalities. Forty-five patients had received maxillofacial radiation for lymphoma, leukemia, rhabdomyosarcoma, and miscellaneous tumors. Forty-three of the 45 patients and the remaining 23 who had not received maxillofacial radiation also received chemotherapy. Dental and maxillofacial abnormalities were detected in 37 of the 45 (82%) radiated patients. Dental abnormalities comprised foreshortening and blunting of roots, incomplete calcification, premature closure of apices, delayed or arrested tooth development, and caries. Maxillofacial abnormalities comprised trismus, abnormal occlusal relationships, and facial deformities. The abnormalities were more severe in those patients who received radiation at an earlier age and at higher dosages. Possible chemotherapeutic effects in five of 23 patients who received treatment for tumors located outside the head and neck region comprised acquired amelogenesis imperfecta, microdontia of bicuspid teeth, and a tendency toward thinning of roots with an enlarged pulp chamber. Dental and maxillofacial abnormalities should be recognized as a major consequence of maxillofacial radiation in long-term survivors of childhood cancer, and attempts to minimize or eliminate such sequelae should involve an effective interaction between radiation therapists, and medical and dental oncologists.

Adolescent↗
PubMed1997

The aesthetic and endodontic dilemmas of calcific metamorphosis.

Traumatic injuries to dentition can initiate either a resorptive or calcific pulpal response. In the sequelae of calcific degeneration, the clinical crown frequently becomes discolored, requiring an aesthetic correction to restore the tooth to its natural color. Four potential solutions are currently available to achieve this goal. The learning objective of this article is to describe the etiology of calcific metamorphosis, discuss the four potential solutions, and present the responses of endodontists polled as to the treatment indications. While the posterior dentition may experience the identical pathologic response to trauma and crown discoloration, this article focuses on the restoration of the anterior dentition. Several cases are presented to illustrate the four treatment modalities, and recommendations for follow-up of traumatic injuries are indicated.

Bicuspid↗
PubMed1994

Unusual pattern of pulp canal obliteration following luxation injury.

Pulp canal obliteration can occur as a result of tooth injury. A case report is presented in which a 6-yr-old patient developed partial pulp canal obliteration of a maxillary central incisor 9 months after luxation injury. The mineralization created unusual canal morphology which presented some difficulty in endodontic treatment of the tooth.

Child↗
PubMed1984

Crystal growth in calcifying fronts during dentinogenesis.

Additional dentinogenesis in calcifying fronts of permanent tooth germs in kittens was examined using a transmission electron microscope. The irregular island-like structures were observed in calcifying fronts. These islands, increased in size, formed the coalescence. Pairs of fine crystals ran parallel in the marginal zone of these islands. At the inner part of the islands, long and wide crystals were abundant. Furthermore, a three-dimensional visualization of crystals revealed that dentin crystals were of needle-like shape. These findings suggest that pairs of fine, needle-like crystals first appear and additional calcification progresses due to fusions between fine crystals, and maturation in crystallization occurs along the long axis following these fusions.

Animals↗
PubMed2001

A clinical and histological evaluation of titanium mini-implants as anchors for orthodontic intrusion in the beagle dog.

The aim of this study was to determine the anchorage potential of the titanium mini-implant for orthodontic intrusion of the mandibular posterior teeth. Six mini-implants were surgically placed around the mandibular third premolars on each side in 3 adult male beagle dogs. On the buccal site, three mini-implants were placed distal to the apex of the distal root of the third premolar, at the interradicular septa of the third premolar, and mesial to the apex of the mesial root of the third premolar, as linearly as possible. The same procedure was performed at the lingual site on both sides of the mandibular third premolars in each dog. Bilateral interradicular mini-implants on both the buccal and the lingual sites were used as the anchorage for the intrusion of the third premolars (loaded implants) and the other mini-implants were used as control (unloaded) implants. In 6 weeks, an intrusive force (150 g) was applied between the interradicular implants on the buccal and the lingual sites by closed coil springs run across the crowns of the third premolars. After 12 to 18 weeks of orthodontic intrusion, the animals were killed and their mandibles were dissected and prepared for histologic and fluorescent observation. The results indicated that the mandibular third premolars intruded 4.5 mm, on average, after 12 to 18 weeks of orthodontic force application, with mild root resorption at the furcation area as well as the root apex. All the mini-implants remained stable during orthodontic tooth movement without any mobility or displacement. The morphometrical findings indicated that the calcification of the peri-implant bone on the loaded implants was equal to or slightly greater than those of the controls. In addition, 6 of the 36 mini-implants were removed after tooth movement, and all of them were easily removed with a screwdriver. These findings suggest that mini-implants are effective tools for the anchorage of orthodontic intrusion in beagle dogs.

Alveolar Process↗