Tanaka Kenko, Sailer Irena, Iwama Ryosuke, Yamauchi Kensuke, Nogami Shinnosuke, Yoda Nobuhiro, Takahashi Tetsu
Division of Oral and Maxillofacial Surgery, Department of Oral Medicine and Surgery, Tohoku University Graduate School of Dentistry, Sendai, Japan.
Division of Fixed Prosthodontics and Biomaterials, University Clinic, Dental Medicine University of Geneva, Geneva, Switzerland.
J Periodontal Implant Sci. 2018 Dec 27;48(6):360-372. doi: 10.5051/jpis.2018.48.6.360. eCollection 2018 Dec.
It has been suggested that resonance frequency analysis (RFA) can measure changes in the stability of dental implants during osseointegration. This retrospective study aimed to evaluate dental implant stability at the time of surgery (primary stability; PS) and secondary stability (SS) after ossseointegration using RFA, and to investigate the relationship between implant stability and cortical bone thickness.
In total, 113 patients who attended the Tohoku University Hospital Dental Implant Center were included in this study. A total of 229 implants were placed in either the mandibular region (n=118) or the maxilla region (n=111), with bone augmentation procedures used in some cases. RFA was performed in 3 directions, and the lowest value was recorded. The preoperative thickness of cortical bone at the site of implant insertion was measured digitally using computed tomography, excluding cases of bone grafts and immediate implant placements.
The mean implant stability quotient (ISQ) was 69.34±9.43 for PS and 75.99±6.23 for SS. The mandibular group had significantly higher mean ISQ values than the maxillary group for both PS and SS (<0.01). A significant difference was found in the mean ISQ values for PS between 1-stage and 2-stage surgery (<0.5). The mean ISQ values in the non-augmentation group were higher than in the augmentation group for both PS and SS (<0.01). A weak positive correlation was observed between cortical bone thickness and implant stability for both PS and SS in all cases (<0.01).
Based on the present study, the ISQ may be affected by implant position site, the use of a bone graft, and cortical bone thickness before implant therapy.
有人提出共振频率分析（RFA）可测量牙种植体骨结合过程中稳定性的变化。本回顾性研究旨在使用RFA评估手术时的牙种植体稳定性（初始稳定性；PS）和骨结合后的二级稳定性（SS），并研究种植体稳定性与皮质骨厚度之间的关系。
本研究共纳入113名就诊于东北大学医院牙种植中心的患者。共植入229颗种植体，其中下颌区域植入118颗，上颌区域植入111颗，部分病例采用了骨增量手术。在三个方向上进行RFA，并记录最低值。使用计算机断层扫描数字化测量种植体植入部位术前皮质骨的厚度，不包括骨移植和即刻种植的病例。
PS时的平均种植体稳定性商数（ISQ）为69.34±9.43，SS时为75.99±6.23。下颌组PS和SS时的平均ISQ值均显著高于上颌组（<0.01）。1期手术和2期手术的PS平均ISQ值存在显著差异（<0.5）。非增量组PS和SS时的平均ISQ值均高于增量组（<0.01）。在所有病例中，PS和SS时皮质骨厚度与种植体稳定性之间均观察到弱正相关（<0.01）。
基于本研究，ISQ可能受种植体位置、骨移植的使用以及种植治疗前皮质骨厚度的影响。
