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At least 127 records · Page 7Linked to original sources
PubMed1995

[Observation of alveolar bone remodeling accompanied with tooth movement by in situ hybridization--expression of type I collagen and bone sialoprotein mRNAs].

The purpose of this study was to investigate expression of type I collagen and bone sialoprotein (BSP) mRNAs in the alveolar bone accompanied with tooth movement. The right side of the upper jaw of the rat was used for orthodontic tooth movement, and the left side was used for physiological tooth movement. After the proper number of days of movement, histological specimens were decalcified and sliced into paraffin sections. The expression of mRNAs was examined by the in situ hybridization method. In the samples of physiological tooth movement, a high level of expression in both mRNAs was observed in osteoblasts along the mineralization front and adjacent osteocytes in the interradicular septum (IRS). In contrast, a low level of mRNA expression was observed on the opposite side of the IRS. In the specimens of experimental tooth movement, a high level of expression was detected in the osteoblasts on the tension side of IRS, but negligible reaction in those on the compression side. These results suggest that BSP gene expression as well as that of collagen are related not only to mineralization in physiological bone remodeling but also to the process by activated osteoblasts induced by orthodontic force. In addition, response to the artificial force was observed in osteocytes in IRS.

Animals↗
PubMedDate not supplied

Effect of constant currents on orthodontic tooth movement in the cat.

Constant 10 muA currents were applied to the mandibles of 12 cats via electrodes implanted mesial and distal to premolars undergoing orthodontic treatment. A third were moved toward the cathode, a third were moved toward the anode, and a third were moved in the absence of an applied field. No significant difference in total movement was seen at the end of five weeks.

Analysis of Variance↗
PubMedDate not supplied

Frequency of alveolar bone loss adjacent to proximal caries in the primary molars and healing due to restoration of the teeth.

The frequency of alveolar bone loss adjacent to extensive proximal caries, and the effect of dental restorations on alveolar bone loss and healthy alveolar bone were examined in human primary molars. Proximal caries, contact loss, mesial drift and the presence of alveolar bone loss were recorded from 190 bite-wing radiographs from 60 boys and 46 girls. Proximal caries was evident in 297 quadrants. In 63.0% of quadrants, both primary molars had proximal caries. Contact loss was evident in 38.4% of the quadrants with proximal caries. Bone loss was found in 12.1% of the quadrants with proximal caries or 31.6% of those with contact loss. Analysis of variance for the presence of bone loss indicated statistically significant values (P less than 0.05) for one or two teeth with caries by quadrant, the presence or absence of contact loss, and age. A second examination was available for 41 children. Among these, eight out of the 36 bone defects disclosed at the first examination were present. At the second examination, after tooth restoration, healing of five bone defects was evident. These findings indicate a connection between the presence and treatment of extensive proximal caries and alveolar bone health in the primary dentition.

Alveolar Bone Loss↗
PubMed1990

A radiographic four-year follow-up study of asymptomatic mandibular third molars in young adults.

Fifty-five asymptomatic mandibular third molars (M3) in 34 dental students (mean age 20.6 years at the start of the study) were followed radiographically for 4 years. Based on clinical evaluation the 55 teeth included 20 almost erupted, 13 partly erupted and 22 non-erupted M3. The following were assessed on the radiographs: root development, level of eruption, sagittal angulation, resorption, pericoronitis/bony pockets/paradental cysts and widening of the periodontal space/dentigerous cysts. The state of 21 teeth (38 per cent) was radiographically changed at the end of the observation period. The most remarkable finding was that 15 teeth changed their sagittal angulation, all in a distal direction; five mesioangular to vertical, five vertical to distoangular, five mesioangular to distoangular. Radiographically, 13 M3 moved to a more advanced level of eruption. No real pathological osseous lesions and no root resorption were observed at initial or follow-up examinations. It is concluded that there are frequent essentially unpredictable changes in the position of M3 after the age of 19 years which may influence decisions on their removal or preservation.

Adult↗
PubMed1977

[Preprosthetic straightening of tilted lower molars with reference to the condition of the periodontium].

30 mesially tipped lower molars in 18 patients have been uprighted previous to prosthetic treatment. The uprighting was performed using arch wires, box loops and uprighting springs. The plaque and gingival conditions as well as the pocket depths and levels of periodontal attachment were assessed at the start of the treatment, after a successfully completed hygienic phase and after the uprighting of the tipped molars. Following the successful completion of the hygienic phase a significant pocket reduction was seen on all surfaces of the teeth besides a highly significant reduction of plaque and gingival index scores. As a result of the orthodontic uprighting, a further significant reduction in pocket depth, associated with a gain of periodontal attachment, was found on the mesial and lingual aspects of the molars. The results indicate that the uprighting of lower tipped molars prior to prosthetic treatment is a simple and predictable procedure to positively influence the prognosis of the teeth involved.

Crowns↗