Comparisons of Miniscrew Implant Primary Stability between Two Different Synthetic Bone Densities during Placement with Either Self-Drilling or Self-Tapping Technique: An in vitro Study
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Abstract
The purpose of this study was to investigate the influence of cancellous bone densities on miniscrew implant primary stability during placement with either self-drilling or self-tapping technique. Forty titanium alloy miniscrew implants were divided into two groups, according to their placement techniques, self-drilling and self-tapping, and placed into synthetic bone of different cancellous bone densities: either 0.64 g/cm3 or 0.32 g/cm3. Maximal insertion torque and vertical pull-out strength were recorded in Ncm and N, respectively. Two-way ANOVA was used to detect interaction between miniscrew implant placement technique and cancellous bone density factors. The result showed that there was a significant interaction between miniscrew implant placement techniques and different cancellous bone densities (p<0.001) on the miniscrew implant primary stability parameters. The insertion torque and pull-out strength values were significantly greater for the miniscrew implant placed in the high-density cancellous bone than in the low-density one (p<0.001). Miniscrew implant placement into the same cancellous bone density with self-drilling technique showed significantly greater insertion torque (p<0.001) and pull-out strength (p<0.05) than those with self-tapping technique. However, no statistically significant difference in maximal insertion torque was found between self-tapping miniscrew implants placed in high-density, and self-drilling miniscrew implants placed in low-density. In conclusion, cancellous bone density influences miniscrew implant primary stability for both self-tapping and self-drilling placement systems. Pre-drilling is recommended for miniscrew implant placement into high-density cancellous bone to avoid high insertion torque and maintain adequate pull-out strength.
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บทความ ข้อมูล เนื้อหา รูปภาพ ฯลฯ ที่ได้รับการลงตีพิมพ์ในวิทยาสารทันตแพทยศาสตร์ มหาวิทยาลัยขอนแก่นถือเป็นลิขสิทธิ์เฉพาะของคณะทันตแพทยศาสตร์ มหาวิทยาลัยขอนแก่น หากบุคคลหรือหน่วยงานใดต้องการนำทั้งหมดหรือส่วนหนึ่งส่วนใดไปเผยแพร่ต่อหรือเพื่อกระทำการใด ๆ จะต้องได้รับอนุญาตเป็นลายลักษณ์อักษร จากคณะทันตแพทยศาสตร์ มหาวิทยาลัยขอนแก่นก่อนเท่านั้น
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