Ozkan Yasar, Ozcan Mutlu, Varol Altan, Akoglu Burcin, Ucankale Mert, Basa Selcuk
Department of Oral and Maxillofacial Surgery, University of Marmara, Istanbul, Turkey.
Int J Oral Maxillofac Implants. 2007 Mar-Apr;22(2):235-42.
The objectives of this study were (1) to compare the stability, evaluated by means of resonance frequency analysis (RFA), of implants placed posterior mandibles augmented with autogenous bone harvested from the mandibular symphysis with that of implants placed in nongrafted edentulous posterior mandibles and (2) to compare peri-implant marginal bone height changes and implant failure for the 2 groups.
Eight patients with thin posterior mandibular ridges (buccolingual crestal width less than 4 mm) underwent labial onlay alveolar grafting with symphyseal bone blocks 4 months prior to placement of 17 implants. Seven nongrafted patients received 18 implants in the edentulous posterior mandible; these patients served as a control group. RFA was performed the day of implant placement (baseline), 1 month postplacement, 4 months postplacement (after prosthesis delivery), and 12 months postloading. Peri-implant bone height changes at a level of 0.01 mm were assessed using periapical radiographs at baseline, the 1-month follow-up, and the 4-month follow-up. Analysis of variance was used to evaluate statistical differences within the groups, and t test was used to make comparisons between groups.
None of the patients presented postoperative complications or implant failure. Mean implant stability quotient (ISQ) was 63.0+/-6.0 to 70.2 +/-3.5 for the grafted group and 64.1+/-4.1 ISQ to 70.1+/-3.9 for the nongrafted group. No significant difference was found in mean ISQ between the grafted and nongrafted groups at baseline, the 1-month follow-up, 4 months postplacement, or 12 months postloading (P = .211, P = .873, P = .925, P = .735, respectively). Mean peri-implant bone loss was 0.16 +/- 0.04 mm mesially and 0.16 +/- 0.05 mm distally.
RFA revealed no difference in implant stability between mandibular ridges augmented with autologous bone grafts at baseline or after loading.
本研究的目的是：（1）通过共振频率分析（RFA）评估下颌后牙区植入种植体的稳定性，比较在下颌骨联合处采集的自体骨增加骨量后的下颌后牙区植入种植体与未植骨的无牙下颌后牙区植入种植体的稳定性；（2）比较两组种植体周围边缘骨高度的变化及种植体失败情况。
8例下颌后牙区牙槽嵴薄（颊舌侧嵴顶宽度小于4mm）的患者，在植入17枚种植体前4个月，接受了用下颌骨联合处骨块进行的唇侧嵌体式牙槽骨移植。7例未植骨患者在下颌后牙区无牙区植入18枚种植体；这些患者作为对照组。在种植体植入当天（基线）、植入后1个月、植入后4个月（义齿戴入后）和加载后12个月进行RFA。在基线、1个月随访和4个月随访时，使用根尖片评估种植体周围骨高度在0.01mm水平的变化。采用方差分析评估组内统计学差异，采用t检验进行组间比较。
所有患者均未出现术后并发症或种植体失败。植骨组种植体稳定性商数（ISQ）均值为63.0±6.0至70.2±3.5，未植骨组为64.1±4.1 ISQ至70.1±3.9。在基线、1个月随访、植入后4个月或加载后12个月时，植骨组和未植骨组的平均ISQ均无显著差异（分别为P = 0.211、P = 0.873、P = 0.925、P = 0.735）。种植体周围平均骨吸收近中为0.16±0.04mm，远中为0.16±0.05mm。
RFA显示，在基线或加载后，自体骨移植增加骨量的下颌骨嵴与未植骨的下颌骨嵴之间种植体稳定性无差异。
