Influence of different drilling preparation on cortical bone: A biomechanical, histological, and micro-CT study on sheep.
Clin Oral Implants Res
; 29(7): 707-715, 2018 Jul.
Article
in En
| MEDLINE
| ID: mdl-29781224
ABSTRACT
OBJECTIVE:
The aim of this study was to investigate the extent of cortical bone remodeling between two different drilling protocols by means of histomorphometric, µ-CT, and biomechanical analyses. MATERIAL ANDMETHODS:
A 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 10 weeks of implantation time. Removal torque (RTQ) was measured on 12 implants of each group and the peri-implant bone was µ-CT scanned. Bone volume density (BV/TV) was calculated in pre-determined cylindrical volumes, up to 1.5 mm 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 1.5 mm from implant surface. Paired sample t test or Wilcoxon signed-rank test was used to investigate differences between the groups.RESULTS:
Group A presented significantly increased RTQ value at 5 weeks, while no difference was observed at 10 weeks. Group B presented increased BV/TV value at 5 weeks. Both groups showed comparable values for totBIC at both time-points. However, Group A presented significantly lower newBIC at 5 weeks. Higher BAFO was observed in Group B at 5 weeks.CONCLUSIONS:
Implants 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 10 weeks, no difference was observed.Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Dental Implantation, Endosseous
/
Cortical Bone
/
Mandible
Limits:
Animals
Language:
En
Journal:
Clin Oral Implants Res
Journal subject:
ODONTOLOGIA
Year:
2018
Document type:
Article
Affiliation country:
Sweden