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Biomechanical and histomorphometric analyses of the osseointegration of microscrews

Oral and maxillofacial surgery Biomechanical and histomorphometric analyses of the osseointegration of microscrews with different surgical techniques in beagle dogs Xiuping Wu DDSa, b, Feng Deng DDSc, Zhiqiang Wang DDSa, b, Zhihe Zhao DDS, PhDa, b, , and Jun Wang DDSa, b aDepartment of Orthodontics, West China College of Stomatology, Sichuan University, Chengdu, China bState Key Laboratory of Oral Diseases, Sichuan University, Chengdu, China cDepartment of Orthodontics, College of Stomatology, Chongqing University of Medical Sciences, Chongqing, 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.

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