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At least 145 records · Page 8Linked to original sources
PubMed1981

Does an impacted tooth cause root resorption of the adjacent one?

External root resorption caused by an adjacent impacted tooth was studied radiographically in 199 cases. Resorption of the root had occurred in fifteen instances (7.5 per cent), the cervical region being least affected. The incidence was highest in the 21 to 30-year-old group and mainly involved male patients. Resorption of the periodontium alone was found in sixteen additional patients; of these, five were followed for 1 year after extraction of the impacted tooth. During this period, the damaged periodontium was completely re-established.

Adolescent↗
PubMed1996

Inhibitory effect of the topical administration of a bisphosphonate (risedronate) on root resorption incident to orthodontic tooth movement in rats.

Root resorption associated with tooth movement is an unsolved problem in orthodontics. If such root resorption could be prevented, it would be an important contribution toward reducing risk factors in orthodontic treatment. The purpose of this study was to examine the effects of the topical administration of a bisphosphonate, risedronate, which is known to be a potent blocker of bone resorption, on root resorption during tooth movement and on the repair of the resorbed root surface after tooth movement in rats. In the first experiment, both the right and left upper first molars were moved buccally with a standardized expansion spring under administration of risedronate. After day 7, extensive root resorption had occurred on the control side, and the area of root resorption reached a maximum on day 14. The topical administration of risedronate caused a significant and dose-dependent inhibition of root resorption after the orthodontic force was applied. In the second experiment, the right and left upper molars were first moved buccally for 3 weeks. Risedronate treatment began on the day the spring was removed. After the force was withdrawn, the resorbed root surfaces on both the control and risedronate-treated sides were gradually restored by apposition of repair cementum (cementoid). The topical administration of risedronate did not appear to inhibit the repair process of root resorption. These results suggest that the topical administration of risedronate may be useful in preventing root resorption of teeth during orthodontic treatment.

Administration, Topical↗
PubMed2002

The relationship between apical root resorption and orthodontic tooth movement in growing subjects.

OBJECTIVE: To investigate the relationship between apical root resorption and orthodontic tooth movement in growing subjects. METHODS: 58 growing subjects were collected randomly into the study sample and another 40 non-treated cases were used as control. The apical resoption of the upper central incisors was measured on periapical film and the incisor displacement was measured on lateral cephalogram. Using multiple linear regression analysis to examine the relationship between root resoption and the displacement of the upper incisor apex in each of four direction (retraction, advancement, intrusion and extrusion). RESULTS: The statistically significant negative association were found between resorption and both intrusion (P < 0.001) and extrusion (P < 0.05), but no significant association was found between resorption and both retraction and advancement. The regression analysis implied an average of 2.29 mm resorption in the absence of apical displacement. CONCLUSIONS: The likelihood that the magnitude of displacement of the incisor root is positively associated with root resoption in the population of treated growing subjects is very small.

Humans↗
PubMed1995

[Physiology and pharmacology of hard tissues--effect of chemicals on the formation and the resorption mechanism of tooth and bone].

This review described the effects of several drugs on the formation and the resorption mechanism of tooth and bone. The enamel formed during high fluoride exposure showed marked hypocalcification, and the organic substances appeared on the incisors in these regions. Such changes following fluoride administration appear to indicate an inhibition of the mineral deposition and/or an inhibition of organic matrix withdrawal. The successive bisphosphonate (HEBP) injections reduced both the progress of the mineral deposition and the formation of the enamel matrix. Colchicine showed a remarkable inhibitory effect on the matrix-forming cells of the dentin and enamel in teeth through its striking inhibitory action on the cytoskeletal system and secretary function. The dentin formation in rabbit and rat incisor dentin was reduced markedly. Colchicine induced reparative dentinogenesis in dental pulp and ectopic calcification in the bone marrow. Both sodium salicylate and aspirin reduced dentin formation through a mechanism that reduces the incorporation of collagen precursors into odontoblasts. Sodium salicylate also inhibited the growth of the upper jaw and tibia in rats. The recruitment of osteoclast-like multinucleated cells was inhibited by sodium salicylate in vitro. A pharmacological approach for studying the formation and resorption mechanism of hard tissue is useful tool for developing hard tissue research.

Animals↗
PubMed1984

Internal resorption complicating orthodontic tooth movement.

A case report is presented of an orthodontic patient who suffered internal resorption and a consequent 'pink spot' affecting a maxillary central incisor. Its management is outlined. The aetiology and possible cellular events responsible are discussed.

Adult↗
PubMedDate not supplied

Cytokine expression in feline osteoclastic resorptive lesions.

Feline osteoclastic resorptive lesions (FORL) of the teeth are common in cats, and lead to pain, destruction of the periodontal ligament, and tooth loss. The expression of interleukin (IL)-1 beta and IL-6 mRNA was higher in teeth with FORL than in normal teeth (P<0.01 and P<0.001, respectively), but no such differences were found between pathological and normal gingival tissue samples. There were no differences between teeth affected with FORL and normal teeth in respect of the expression of receptor activator of NF kappa B ligand (RANKL) mRNA or osteoprotegerin (OPG) mRNA. However, OPG mRNA expression was higher in gingival tissue associated with teeth affected with FORL than in normal gingival tissue (P<0.05), whereas the reverse was true of RANKL mRNA expression (P<0.05). OPG mRNA expression was significantly higher in teeth than in femoral and alveolar bone (P<0.001). RANKL and OPG mRNAs were detected in all tissues examined. The data suggest that the elevated expression of IL-l beta and IL-6 mRNA plays a role in the mediation of osteoclast activity in advanced FORL. In contrast, OPG and RANKL do not appear to regulate osteoclasts in advanced disease. The results also suggest that OPG and RANKL mRNA play a role in mediating inflammatory responses in gingival cells, and that OPG has an inhibiting effect on tooth resorption.

Animals↗
PubMed1976

[Light microscopic presentation of the morphological behavior of the nerves of deciduous teeth during tooth exfoliation deciduous and after loss of the dentition].

Structural changes in the nerve can hardly be demonstrated in nerve sections located intradentally, i.e. away from the area of tooth resorption. pseudohypersegmentation, however, is found intradentally in nerve sections of the radical pulp close to the resorption area. Serious lesions of the nervous substance are found extradentally, in the direct neighborhood of the erupting permanent tooth. If the deciduous tooth was lost more than 12 months ago, intraosseously the final stage of physiological degeneration is reached.

Child↗