Histologic Evaluation of Healing Process in the Alveolar Socket After Tooth Extraction With Ridge Preservation Using Coralline Hydroxyapatite

socket preservation is a main therapeutic procedure to prevent severe marginal bone resorption after tooth extraction. Aim of this study: to investigate if there is any difference in the amount of new bone formation 4 months after extraction and ridge preservation compared to that after 6 months, Using Coralline hydroxyapatite as a bone substitute.

Histologic Analysis of Healing Process After Tooth Extraction With Ridge Preservation Using tricalcium phosphate

Background: socket preservation is a main therapeutic procedure to prevent severe marginal bone resorption after tooth extraction. The aim of this study is to investigate if there is any difference in the amount of new bone formation 4 months after extraction and ridge preservation compared to that after 6 months, Using tricalcium phosphate as a bone substitute. Methods: Minimally traumatic extraction with socket preservation using tricalcium phosphate was done at 30 single-rooted tooth sites in 28 patients. 15 sites healed for an average of 18 weeks (early healing group), and 17 sites were allowed to heal for an average of 27 weeks (delayed healing group) before collecting the bone samples . histological analysis was held to detect the percentage of new bone formation, residual substitute particles, and connective tissue/non-mineralized structures for each site. Results: All samples revealed a new bone formation, most of the residual substitute particles were surrounded by woven bone. No statistically significant differences in the amount of newly formed bone or residual substitute particles were found between the two groups. Overall, the early healing group demonstrated a mean of34.8% newbone, 20.5%residual substitute material, and 44.7% non-mineralized tissue. The delayed healing group showed mean values of 36%, 18.5%, and 45.5%, respectively. Conclusion: This study suppose that waiting for 6 months after tooth extraction and socket preservation using tricalcium phosphate does not provide a greater amount of new bone formation or less residual bone particles compared to that after 4 months.

A study of width changes in the expanded alveolar ridge by bone spreader technique and bone splitting technique with immediate implantation

This prospective clinical trial aims to investigate the change of alveolar ridge width after immediate implantation using tow deferent techniques in expanding the alveolar ridge. In this study, 12 patients (9 female,3 male) with narrow alveolar ridges in the maxilla were treated. 20 dental implants were immediately installed after the expansion procedures of the selected narrow ridges , 10 implants with Bone Spreader technique , and 10 implants with Bone Splitting technique .

Effects of calcium deficiency and estrogen depletion On alveolar bone in rabbits

This study was conducted to investigate the relationship between estrogen depletion ,calcium-deficiency,and alveolar bone loss. Alveolar bone loss was evaluated by radiographic and visual inspection of rabbits with experimental lack of estrogen and calcium. Twenty female local rabbits (4 months old) were divided into four groups :group a -ovariectomized and given a standard solid diet. Group b-ovariectomized and given a calcium – deficient diet Group c-sham-ovariectomized and given a standard solid diet. And group d-sham-ovariectomized and given a calcium-deficient diet after 8 weeks,the rabbits were sacrificed . The maxillae, mandibles, femurs, and tibias were removed carfully and fixed in 10% neutral buffered formalin. The bone mineral density of each bone and the alveolar bone loss were measured.the bone meniral densities of the maxillae,mandibles,femurs and tabias in group (c) were significantly higher than those in groups (b)and (d),but not higher than those in group a.however there were no significant differences between any of the groups with regard to alveolar bone loss from the cemento-enamel junction to the molar bone crest.