- Browse by Subject
Browsing by Subject "tooth movement"
Now showing 1 - 2 of 2
Results Per Page
Sort Options
Item Decreased alveolar bone turnover is related to the occurrence of root resorption during experimental tooth movement in dogs(2015) Deguchi, Toru; Seiryu, Masahiro; Daimaruya, Takayoshi; Garetto, Lawrence P.; Takana-Yamamoto, Teruko; Roberts, W. Eugene; Department of Oral Pathology, Medicine and Radiology, IU School of DentistryObjective: To investigate the relationship between root resorption (RR) and bone turnover in two different types of tooth movement in dogs. Materials and Methods: A total of 16 dogs in two different groups were used. Tooth movement of dog premolars resulted from approximately 200 g of force. Histomorphometric analysis of premolar roots was assessed after 4 and 12 weeks of tooth movement by comparing nonresorptive to resorptive surfaces. Results: Histomorphometric analysis indicated a significant decrease in the bone formation rate in the root resorptive areas, which resulted in decreased bone volume after 12 weeks. The threshold to detect RR in periapical radiographs was about 1.0 mm2. Conclusions: A sustained mechanical load, due to the prolonged stress and strain of continuous mechanics, induces elevated bone metabolic activity, such as the bone turnover (remodeling) and change in bone volume (modeling). Therefore, our data support the hypothesis that increased RR is related to decreased bone formation (turnover) in high stress areas exposed to prolonged orthodontic tooth movement.Item The effect of corticision on root resorption with heavy and light forces(2016-01) Murphy, Christopher; Zalajzic, Zana; Chandhoke, Taranpreet; Utreja, Achint; Nanda, Ravindra; Uribe, Flavio; Department of Orthodontics and Oral Facial Genetics, School of DentistryObjective: To investigate the association between corticision and different force magnitudes with the amount of root resorption. Methods: Forty-four male Wistar rats (7 week old) were evaluated after an orthodontic spring delivering either 10 or 100 g was placed on the left maxillary first molars to move molars mesially. Experimental rats were divided into four groups, with 11 animals in each group: (1) LF, no corticision and 10 g of orthodontic force; (2) LFC, corticision and 10 g of force; (3) HF, no corticision and 100 g of force; and (4) HFC, corticision and 100 g of force. Contralateral sides were used as unloaded controls. The total duration of the experimental period was 14 days. Two-dimensional (histomorphometric) and three-dimensional (volumetric, micro-focus X-ray computed tomography [microCT]) analysis of root craters were performed on maxillary first molars. Results: Histomorphometric and microCT analysis revealed a significant amount of resorptive areas in the experimental groups when compared to unloaded controls. However, no significant difference was detected in the amount of resorption among the four experimental groups. Conclusions: At day 14, neither the amount of force nor the cortical incision caused significant effect on root resorption that was registered by histomorphometric or microCT analysis.