Department of Surgical, Medical, Molecular and Critical Area Pathology, University of Pisa, Pisa, Italy.
Department of Surgery and Translational Medicine, University of Florence, Florence, Italy.
Clin Implant Dent Relat Res. 2018 Jun;20(3):322-332. doi: 10.1111/cid.12586. Epub 2018 Jan 23.
Implant stability is commonly related to insertion torque. Recently, it has been suggested that higher insertion torque may lead to greater bone resorption.
The aim of the present randomized clinical study was to evaluate the role of different insertion torque values in terms of implant success, marginal bone loss, and facial soft tissues recession.
Patients requiring a single dental implant were recruited and randomized to receive one of two implants with the same macro-geometry but different cutting designs. First group consists of a 90 degrees cutting groove know as self-tapping implant, and the second group known as Blossom™ cutting groove. (Intra-Lock, Boca Raton, Florida). The insertion torque (IT) was assessed and two groups followed: high-IT (≥50 Ncm) group and regular-IT (<50 Ncm) group. After 3 months, all the implants were restored. At baseline, buccal bone thickness (BBT) was recorded. During the 3-year survey, the following outcomes had been registered: implant failures and success, radiographic marginal bone level around dental implant (MBL) and facial soft tissue level (FSTL).
A hundred and sixteen implants were placed in healed sites. The overall survival rate after 3 years was 96.5%. The Cumulative Success Rate was 91.3% for the High IT group and 98.2% for the Regular IT group. The mean marginal bone loss and facial soft tissue recession, at a 3-year evaluation, were significantly greater for the High-IT group and in the mandible than that reached in the Regular-IT group and in the maxilla.
Present findings showed that implants placed with higher insertion torque in mandible led to greater bone resorption and mucosal recession than that registered for implants placed with a regular IT. Moreover, sites with a thick buccal bone wall (≥1 mm) showed smaller recession at the facial soft tissue level after 3 years.
种植体稳定性通常与植入扭矩有关。最近有人提出，较高的植入扭矩可能会导致更大的骨吸收。
本随机临床研究的目的是评估不同植入扭矩值在种植体成功率、边缘骨丧失和面部软组织退缩方面的作用。
招募需要单颗牙种植的患者，并随机分为两组，每组接受相同宏观几何形状但不同切割设计的两种种植体。第一组为自攻式种植体，有 90 度切割槽，称为自攻种植体，第二组称为 Blossom™切割槽。（Intra-Lock，佛罗里达州博卡拉顿）。评估植入扭矩（IT），并将两组分为高 IT（≥50 Ncm）组和常规 IT（<50 Ncm）组。3 个月后，所有种植体均进行修复。基线时记录颊侧骨厚度（BBT）。在 3 年的随访中，记录了以下结果：种植体失败和成功、种植体周围的放射状边缘骨水平（MBL）和面部软组织水平（FSTL）。
在愈合部位共植入 116 颗种植体。3 年后的总体存活率为 96.5%。高 IT 组的累积成功率为 91.3%，常规 IT 组为 98.2%。高 IT 组和下颌的平均边缘骨丧失和面部软组织退缩在 3 年评估时显著大于常规 IT 组和上颌。
目前的研究结果表明，下颌植入较高植入扭矩的种植体导致的骨吸收和黏膜退缩大于常规植入扭矩的种植体。此外，颊侧骨壁较厚（≥1 毫米）的部位在 3 年后面部软组织水平的退缩较小。
