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Results for “Root Resorption”

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At least 1,621 records · Page 90Linked to original sources

PubMed1984

The effects of space closure of the mandibular first molar area in adults.

There is little information regarding the orthodontic closure of remodeled, edentulous spaces in the posterior area of the mandible. The present study was undertaken to determine the dental and periodontal changes that occur when mandibular first molar areas are closed in adults. Fourteen adult patients were selected from private orthodontic practices. Pre- and posttreatment study models were used to measure the mesiodistal length of the edentulous space and the buccolingual width of the alveolar ridge. The amount of crown and root movement of the second molar and premolar was measured from lateral cephalometric radiographs. From pre- and posttreatment panoramic or periapical radiographs, the anatomic changes of the second molar and adjacent periodontium were also measured. Every case showed significant space closure (x = 6.2 mm) ranging from 2.7 to 11.5 mm. There was crestal bone loss (x = 1.3 mm) mesial to the second molar in all but five cases. These latter cases showed bone addition. As the molar moved mesially , the alveolar ridge increased in width an average of 1.2 mm. The adult patient who showed the greatest amount of space closure and the least amount of molar bone loss had (1) mesiodistal space of 6.0 mm, (2) buccolingual ridge width of 7.0 mm, and (3) mesial molar bone level 1.0 mm apical to the cementoenamel junction. The results of this study indicate that space closure is not only possible but may aid the treatment of certain cases. Space closure should be considered as a potential solution to the absence of mandibular first permanent molars.

Adult↗

PubMed1986

Influence of orthodontic treatment on root development of autotransplanted premolars.

The aim of this study was to clarify whether orthodontic movement of autotransplanted premolars will affect the final root length of the transplants. A group of 29 autotransplanted premolars that had been orthodontically treated was compared with a group of 30 autotransplanted premolars that had not been orthodontically treated. Contralateral teeth in both groups served as controls. The root lengths of the transplants as well as the controls were measured on the radiographs immediately after transplantation and also after orthodontic treatment and complete root formation. The results demonstrated that there was no statistically significant difference between the original and final root lengths of the transplants in the two samples or between the contralateral teeth. The autotransplantation of the premolars resulted in an average shortening of 1 to 2 mm compared to the contralateral control teeth. Futhermore, orthodontic movement of the transplants appeared to have a tendency to shorten the final root length.

Adolescent↗

PubMed1999

Surgically assisted rapid palatal expansion: orthodontic preparation for clinical success.

Close root proximity between the maxillary central incisors presents a problem in the surgical management of a maxillary palatal expansion. During the surgical fracture of this interdental area, the possibility exists for a separation to occur between the root surface and the bone. If this does occur, it is paramount that the gingival attachment remain intact. Asymmetric separation places more stress on the mesial gingival attachment because of the anatomy of the gingival fiber apparatus. Gingival detachment results in epithelial downgrowth in an apical direction, which in turn prevents bone apposition in a coronal direction. The resulting osseous defect is difficult to treat with an osseous graft procedure, as there are few if any intrabony walls. Treatment planning should include analysis of a recent periapical radiograph of the incisor roots to determine the need for orthodontic root separation before surgery. A postsurgical periapical radiograph should be taken to determine where the interdental separation has occurred. The expansion schedule should be adjusted depending on the symmetry of the separation and the health of the gingival attachment.

Adult↗

PubMed1988

Spreading of dentinoclasts on various substrata in vitro.

An in vitro system for isolated dentinoclasts is described in which clastic cells which are not contemporaneously engaged in resorption are gently rinsed from the surface of actively resorbing root dentin. Dentinoclasts were cultured on a variety of hard tissue constituents in order to investigate the effects of substratum composition on the expression of resorbing structures by these cells, and examined with scanning electron microscopy. Results revealed that dentinoclasts express both ruffled borders and clear zones only when cultured on coverslips coated with both collagen and hydroxyapatite. Hydroxyapatite alone induced only the formation of a clear zone. Failure to express either clear zones or ruffled borders by cells cultured on collagen-coated coverslips was interpreted to reveal that collagen itself is not capable of, but requires the mineral component of hard tissue for, producing morphologic resorbing structures in clastic cells.

Albumins↗

PubMed1997

Resin-ionomer and hybrid-ionomer cements: part II, human clinical and histologic wound healing responses in specific periodontal lesions.

Twenty-five subjects with a total of 50 subgingival restorations participated in this study. At the beginning of the investigation, nine teeth that were considered hopeless because of the extent of their pathology were selected for extraction to evaluate histologically the restorations and their effect on the adjacent tissues. The purpose of this article is to demonstrate the responses to the clinical applications as well as to the placement of resin-ionomers in subgingival lesions. Clinical and histologic evidence of epithelial and connective tissue adherence to resin-ionomer restorative materials was observed during the healing process.

Adult↗

PubMedDate not supplied

[Tooth transplantation].

In the light of the thesis of J. Thibault, the authors suggest, in association with transplantation of wisdom tooth buds into the alveolus of the first molar, a technique consisting of placing the graft in its pre-eruptive position, removing in a block the bud, the gubernaculum and the sub-jacent gingival mucosa. Under these conditions, eruption occurs at the same time as development of the roots, which represents the most physiological solution. At the same time as formation of the root, the authors noted a paradoxal rhizalysis, hypercementosis resulting in ankylosis and conservation of vitality. In addition, almost all the teeth transplanted proved to be highly vulnerable to caries.

Female↗

PubMed1975

A radiographic study of rostral tooth development in young Friesian cattle.

Twenty-nine British Friesian cattle fed the same diet, slaughtered at various weights and including bulls, steers (castrated males) and females (heifers) were examined. The stage of their rostral tooth development was recorded both visually and radiographically. Insufficient animals were present in each sex and slaughter weight treatment group to allow any comparison between them. When the data for each sex were compared, no statistically significant differences were seen between the mean ages at which bulls, steers and heifers attained each stage of dental development as determined from their radiographs. The results for all 29 cattle were then combined. This combined data showed a relationship between age and those stages of tooth formation which could be differentiated by examination of the X-ray films. As most phases of tooth formation occurred within well defined limits, it is suggested that radiographs of rostral tooth development might be used to estimate the age of cattle.

Age Factors↗

PubMed1972