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At least 73 records · Page 4Linked to original sources
PubMed1989

Disturbances of tooth form and eruption in the microphthalmic (mi) mouse: a light and electron microscopic study.

Changes in the surrounding alveolar bone occur during tooth eruption. The microphthalmic (mi/mi) mouse suffers from osteopetrosis and lack of bone resorption; tooth form and eruption were examined in both affected mi/mi mice and unaffected litter-mates to determine the effect of osteopetrosis on tooth development and eruption. Paraffin sections of mandibles from 3, 7, 10, 13, 15 and 20-day-old mice were examined by light microscopy after staining with haematoxylin and eosin and for stable acid phosphatase activity. Mandibles from 15- and 20-day-old mice were examined by scanning electron microscopy. The ultrastructure of odontoblasts was observed in 15-day-old mice. Tooth eruption was significantly reduced in the mi/mi mice; the bone of affected mice increased in area with increasing age and marrow spaces narrowed. There was little bony remodeling in the mi/mi mouse, as indicated by layers of reversal lines. This lack of bone resorption affected tooth eruption and root formation. No abnormalities were detected in odontoblasts, suggesting functional normality, but the wide predentine layer in the mi/mi mouse may indicate an alteration in dentine mineralization.

Animals↗
PubMed1990

[Changes of vibration frequency due to root resorption of deciduous tooth].

The purpose of this study was to investigate the changes of vibration frequency of a deciduous tooth due to physiological root resorption. The author developed an analysis system for tooth vibration by applying an impact-hammer to the tooth. Peak frequency (Hz) of the tooth stimulated by the impact-hammer was observed by the analysis system. The following results were obtained: 1) Peak frequency of the tooth vibration shifted to a lower range according to the root resorption both in vitro (simulation model) and in vivo (15 children) and a high positive correlation was found between the peak frequency and the crown-root length ratio (r = 0.840). 2) A cause of the frequency shift to the lower range was not related to the tooth weight but to the change of tooth gravity due to the root resorption. 3) It was considered that the vibration analysis system could be useful on measuring tooth mobility in vivo and in clinic as well.

Child↗
PubMed1986

Autotransplantation of maxillary canine teeth. A follow-up of 35 cases up to 4 years.

35 cases of autotransplantation of nonendodontically treated maxillary canines were followed for up to 4 years and were assessed according to loss of the transplanted tooth, onset of sensibility, mobility, intact lamina dura and presence of tooth resorption. The results of this study compare favourably with other studies and favour the hypothesis that little is to be gained by not endodontically treating autotransplanted teeth immediately after splint removal. It is also suggested that immobilization by means of a rigid splint, removing the tooth from occlusal forces, may account for the relatively low incidence of resorption in this series.

Adolescent↗
PubMed1985

Studies of a family manifesting premature exfoliation of deciduous teeth.

We report observations made on a family in which the children manifested premature exfoliation of the deciduous incisors and canines beginning as early as 1.5 years of age. We observed gingival recession, alveolar bone resorption, tooth loosening and exfoliation without apical root resorption in the absence of clinical signs of inflammation. The children's mother, age 26, had a normal periodontium, but the father, age 30, had periodontitis of moderate severity. Exfoliated deciduous teeth from one of the children were examined histologically and features characteristic for hypophosphatasia were seen. However, localized prepubertal periodontitis could not be ruled out from these data alone. The differential diagnoses for this type of condition are discussed.

Adult↗
PubMed1980

Hard-tissue resorption and deposition after endodontic instrumentation.

Hard-tissue resorption and deposition following endodontic instrumentation were studied histologically in forty-one monkey teeth after 2, 7, and 42 days. No medicaments and no root canal filling materials were used. The number and length of lacunae and areas of resorption of the root canal wall, the root surface, and the lamina dura were counted and measured. Resorption, stimulated by instrumentation, was observed after 7 days at all sites. Resorption was slight at the root canal wall and at the root surface and was significantly more severe than normal osteoclastic replacement in the adjacent lamina dura. After 42 days the reaction had subsided at the three sites, but none of the tissue had returned to normal. Inflammatory reaction due to infection of the root canal appeared to enhance resorption after 42 days at the root canal wall and the lamina dura, but this was not observed at the root surface.

Alveolar Process↗
PubMed1975

An inhibitory principle in the matrix of periodontally diseased roots.

The inhibitory influence shown by the periodontally diseased root resides in its organic component. Its nature is uncertain and it may be an etiologic factor in periodontal destruction. The apatite structures of healthy and diseased roots are alike in being more receptive to the growth of bone and marrow than are their respective matrices.

Abdomen↗