Cannizzaro Gioacchino, Felice Pietro, Leone Michele, Ferri Vittorio, Viola Paolo, Esposito Marco
Department of Periodontology, University of Bologna, Italy.
Eur J Oral Implantol. 2012 Summer;5(2):111-21.
To evaluate the medium-term effectiveness of 6.5 mm-long flapless-placed single implants immediately or early loaded at 6 weeks.
Thirty patients received two single NanoTite external hex Biomet 3i implants each, which were then randomly allocated to be immediately or early loaded according to a splitmouth design. Implants had to be inserted with a minimum torque of >40 Ncm. Provisional crowns were put in slight occlusal contact and replaced by definitive crowns 3 months after loading. Patients were followed for 4 years after loading. Outcome measures were implant failures, biological and biomechanical complications, peri-implant marginal bone level changes, and patient preference.
Twenty-nine implants were immediately loaded and 31 early loaded. Four years after loading, no drop-outs occurred. One implant failed in each group within 2 months after loading. Seven patients experienced complications at immediately loaded implants and 6 at early loaded implants. There were no statistically significant differences between groups for implant losses, complications, mean marginal bone level changes and patient preference.
Flapless-placed 6.5 mm-long single implants can be immediately loaded and remain successful up to 4 years after loading. Even longer follow-ups are still needed to evaluate the longterm prognosis of short implants.
评估6周时即刻或早期负重的6.5毫米长无瓣植入单颗种植体的中期有效性。
30例患者每人接受两颗NanoTite外部六角形Biomet 3i单颗种植体，然后根据双侧对照设计随机分配为即刻负重或早期负重。种植体植入时的最小扭矩必须>40 Ncm。临时冠保持轻微咬合接触，并在负重3个月后更换为永久冠。患者在负重后随访4年。观察指标包括种植体失败、生物学和生物力学并发症、种植体周围边缘骨水平变化以及患者偏好。
29颗种植体即刻负重，31颗早期负重。负重4年后，无患者退出。每组各有1颗种植体在负重后2个月内失败。7例即刻负重种植体的患者和6例早期负重种植体的患者出现并发症。两组在种植体丢失、并发症、平均边缘骨水平变化和患者偏好方面无统计学显著差异。
6.5毫米长的无瓣植入单颗种植体可即刻负重，且负重后4年内仍保持成功。仍需要更长时间的随访来评估短种植体的长期预后。
