Objectives: Highlight the outcome of alveolar grafting with synthetic bone substitute (Osteon III) only in various bone defect volumes.
Material and Method:
Prospective study accomplished on 55 patients (6-13 years aged) with unilateral alveolar bone cleft. Osteon III, consisting of hydroxyapatite (HA) and tricalcium phosphate (TCP) used to reconstruct the defect. Alveolus defect diameter calculated before surgery (V1), after 3 months (V2) and lastly after 6 months (V3) post-surgery. T-Test significant difference and correlation between V1, V2 and V2, V3 are stated. P value of ≤ 0.01 considered significant difference between parameters.
Result
Degree of cleft divided to small (9 cases), medium (20 patients) and large (26 cases). Bone volume of clefted site divided to three steps: volume 1: (mean 18.1091mm). Step 2: After 3 months volume 2 resemble amount of unhealed defect (mean 0.5109mm) and final bone volume assessment after 6 months (22.5455mm). Both show statistical significant differences in bone volume formation.
Conclusion:
Alloplastic bone substitute also can be used as graft material because of unlimited bone retrieval. Osteon III can be used to reconstruct the alveolus cleft smoothly and promising.
Aims: In an effort to improve the shear bond strength of resin modified glass ionomer cement on orthodontic brackets, various enamel conditioning have been evaluated for use with this cement. Materials and methods: A total of 100 freshly extracted human premolars were subjected to two steps of treatment. The first step of treatment involve dividing the teeth into 5 groups each of 20 teeth: (I) treated with 20 second acid etching with 37% phosphoric acid; (II), treated with micro-etching using 50 µ aluminum oxide; (III), treated with air polisher using 45 µ sodium bicarbonate; (IV), treated with coarse finishing disk for 10 second; (V), left the enamel clean without treatment. In the second step each group then subdivided into two subgroups, ten teeth subjected to wetting with tab water and ten left dry. Following, storage for 24 hours at 37°C in distilled water, shear debonding force was measured using a Universal Testing Machine with a cross-head speed of 10 mm/minute. Results: The result indicated that the highest shear bond strength was for acid etched enamel under wet condition with lowest mean for normal dry enamel. the Mann-Whitney analysis estimated a significant difference between wet and dry condition in general with high probability of bond failure for the dry than that of wet conditions. Conclusions: The suitable enamel conditions regarding the shear bond with the mode of bond failure had been shown to be the wet and dry situation of group III and wet situation of group IV. But, it could be concluded that the most suitable enamel condition may be that treated with a coarse finishing disk under wet condition.
Aims:To evaluate the effect of immersion periods in artificial saliva on the surface roughness of an arch wire. Materials and Methods: The roughness of three types of orthodontic arch wires: stainless steel (SS), titanium molybdenum alloy (TMA) and composite coated wire (CC) were first measured at dry condition then incubated in artificial saliva at 37 o C with saliva pH (7.25) for different immersion periods (1, 14 and 28 days). Then the surface roughness was measured by using Taylor Hobson Profilometer (Talysurf type 10). Results: There was a significant increase in surface roughness of the three types of wires during the first day of immersion but as the immersion periods increased, it showed a non significant difference in the roughness of SS and TMA. The roughness of CC however, increased. Conclusions: It was concluded that the surface roughness of SS and TMA wires increased during the first day of immersion, such increase is not significant after that, while in case of CC, as the immersion periods increase the surface roughness significantly increased.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.