Related Experiment Video
Updated: Jul 3, 2026
An Improved Mechanical Testing Method to Assess Bone-implant Anchorage
Published on: February 10, 2014
Biomechanical and histomorphometric analyses of the osseointegration of microscrews with different surgical
Xiuping Wu1, Feng Deng, Zhiqiang Wang
1Department of Orthodontics, West China College of Stomatology, Sichuan University, Chengdu, China.
Objectives:
The purpose of this study was to evaluate the difference between the drill-free method and the drilling method regarding their effects on microscrew stability after 2, 4 and 8 weeks of implantation.
Study Design:
Thirty-six screw-type microscrews were inserted into the buccal region of the maxilla in 6 beagle dogs. The microscrews were divided into 2 groups of 18 each: the drill-free group and the drilling group. Microscrews in the drill-free group were inserted without drilling, and those in the drilling group were inserted into the site that had been drilled with a pilot drilling bur. After 2, 4, and 8 weeks of healing, the dogs were killed and all bone-screw specimens were prepared for biomechanical testing, histologic observation, and histomorphometric evaluation.
Results:
Histologic observations revealed a continuing bone remodeling with new bone formation in the periscrew region in both groups. The pullout force and the bone-implant contact were significantly higher in the drill-free groups compared with the drilling groups for the 2 and 4 weeks (P < .05), but there was no significant difference after 8 weeks' healing period (P > .05).
Conclusions:
The present study demonstrated that drill-free microscrews could provide stronger stability in the maxilla than the drilling microscrews in the early phase of healing.
