Sun Shan-Pao, Lee Dong-Won, Yun Jeong-Ho, Park Kwang-Ho, Park Kwang-Bum, Moon Ik-Sang
Department of Periodontology, Gangnam Severance Dental Hospital, College of Dentistry, Yonsei University, Seoul, Republic of Korea.
Department of Periodontology, School of Dentistry and Institute of Oral Bioscience, Chonbuk National University, Jeonju, Republic of Korea.
J Periodontol. 2016 Nov;87(11):1360-1368. doi: 10.1902/jop.2016.150738. Epub 2016 Jul 15.
Implants with deep thread depth have been developed for the purpose of increasing total implant surface area. However, effects of implant thread depth remain controversial. The aim of this study is to examine effects of thread depth on peri-implant tissues in terms of bone-implant contact (BIC), bone-implant volume (BIV), and hard and soft tissue dimensions using comprehensive analyses, including microcomputed tomography (micro-CT).
Five beagle dogs received experimental intramandibular implants 3 months after removal of their premolars and first molars (P, P, P, and M). Two different types of implants were installed in each animal: deep threaded (DT) and shallow threaded (ST). Resonance frequency testing was performed on the day of implantation as well as 4 and 8 weeks after implantation. Intraoral radiography, micro-CT, and histomorphometry were used to evaluate peri-implant tissues 4 and 8 weeks after implantation.
There were no significant differences in resonance frequency test results between the two groups. Although radiographic analysis showed no group differences, micro-CT (P = 0.01) and histomorphometry (P = 0.003) revealed the DT group had significantly lower BIC values than the ST group at 4 weeks. However, by 8 weeks, BIC values of the two groups did not differ significantly. No significant differences in BIV or soft tissue height were observed between the two groups at either time point.
DT implants showed no benefits over ST implants when inserted in dog mandibles.
为增加种植体总表面积，已研发出具有较深螺纹深度的种植体。然而，种植体螺纹深度的影响仍存在争议。本研究旨在通过包括显微计算机断层扫描（micro-CT）在内的综合分析，从骨-种植体接触（BIC）、骨-种植体体积（BIV）以及硬组织和软组织尺寸方面，研究螺纹深度对种植体周围组织的影响。
5只比格犬在拔除前磨牙和第一磨牙（P、P、P和M）3个月后接受实验性下颌骨内种植。每只动物植入两种不同类型的种植体：深螺纹（DT）和浅螺纹（ST）。在植入当天以及植入后4周和8周进行共振频率测试。在植入后4周和8周，采用口腔内放射摄影、micro-CT和组织形态计量学评估种植体周围组织。
两组的共振频率测试结果无显著差异。虽然放射学分析未显示组间差异，但micro-CT（P = 0.01）和组织形态计量学（P = 0.003）显示，在4周时，DT组的BIC值显著低于ST组。然而，到8周时，两组的BIC值无显著差异。在两个时间点，两组之间的BIV或软组织高度均未观察到显著差异。
在犬下颌骨中植入时，DT种植体相对于ST种植体并无优势。
