Influence Of Different Drilling Preparation On Cortical Bone: A Biomechanical, Histological, And Micro-Ct Study On Sheep
CLINICAL ORAL IMPLANTS RESEARCH(2018)
Abstract
ObjectiveThe aim of this study was to investigate the extent of cortical bone remodeling between two different drilling protocols by means of histomorphometric, mu-CT, and biomechanical analyses.Material and methodsA total of 48 implants were inserted into the mandible of six sheep following two drilling protocols: Group A (Test, n=24), undersized preparation; Group B (Control, n=24), non-undersized preparation. The animals were euthanatized to obtain 5 and 10weeks of implantation time. Removal torque (RTQ) was measured on 12 implants of each group and the peri-implant bone was mu-CT scanned. Bone volume density (BV/TV) was calculated in pre-determined cylindrical volumes, up to 1.5mm from implant surface. Non-decalcified histology was prepared on the remaining 12 implants from each group, where total bone-to-implant contact (totBIC) and newly-formed BIC (newBIC) was measured. Bone Area Fraction Occupancy (BAFO) was determined in pre-determined areas up to 1.5mm from implant surface. Paired sample t test or Wilcoxon signed-rank test was used to investigate differences between the groups.ResultsGroup A presented significantly increased RTQ value at 5weeks, while no difference was observed at 10weeks. Group B presented increased BV/TV value at 5weeks. Both groups showed comparable values for totBIC at both time-points. However, Group A presented significantly lower newBIC at 5weeks. Higher BAFO was observed in Group B at 5weeks.ConclusionsImplants inserted into undersized sites has an increased biomechanical performance, but provoked major remodeling of the cortical bone during the early healing period compared to non-undersized preparations. After 10weeks, no difference was observed.
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Key words
bone remodeling,regeneration,dental implant(s),osseointegration,osteotomy,torque,x-ray microtomography
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