A randomized controlled clinical trial comparing the effects of three loading protocols on dental implant stability.
A randomized controlled clinical trial comparing the effects of three loading protocols on dental implant stability.
复制标题
一项随机对照临床试验，比较三种加载方案对牙种植体稳定性的影响。
DOI：
--
复制
发表时间：
2012
期刊：
影响因子：
--
通讯作者：
T. Weesner
中科院分区：
文献类型：
--
作者：
R. Barewal;C. Stanford;T. Weesner
目的
本分层随机对照试验（SRCT）的主要目的是比较种植体植入后愈合的前16周内，在三种不同负荷方案下放置的牙种植体的稳定性。即刻、早期（6周）或常规/延迟时间（12周）加载种植体。次要结局是比较植入后3年的边缘骨适应性。
材料和方法
检查了上颌骨或下颌骨中的单个后部植入部位。旋入扭矩值是载荷分配的主要决定因素。在前16周的随访预约中进行共振频率分析（结果作为植入物稳定性指标[ISQ]提供）。通过X线片评估边缘骨水平。
结果
2004年至2007年，40名患者每人接受了一个直径为4.0 mm的牙种植体。Lekholm和Zarb 4型骨中发生1例植入物失效，插入扭矩值（ITV）< 8.1 Ncm;累积成功率为97.5%。根据骨和载荷类型分类时，所有种植体的稳定性均随时间推移而增加，在即刻载荷组中，4周时ISQ单位略微减少1.3。3年的平均边缘骨丢失为0.22 mm。种植体植入时，骨类型1和2（组合在一起）、3和4的平均ITV分别为32、17和10，差异显著（P <0.05）。
结论
ITV是一个很好的客观测量骨类型。使用20 Ncm的ITV作为即刻加载的决定因素，使用10 Ncm或更大的ITV作为早期加载的决定因素，为该植入物提供了长期成功，并且未导致组织反应的负面变化。在愈合的前4个月内，所有骨类型组和负荷组的稳定性均未降低。
PURPOSE
The primary goal of this stratified randomized controlled trial (SRCT) was to compare the stability of dental implants placed under three different loading regimens during the first 16 weeks of healing following implant placement. Implants were loaded immediately, early (6 weeks), or with conventional/delayed timing (12 weeks). Secondary outcomes were to compare marginal bone adaptation for 3 years after placement.
MATERIALS AND METHODS
Single posterior implant sites in the maxilla or mandible were examined. The insertion torque value was the primary determinant of load assignment. Resonance frequency analysis was performed at follow-up appointments for the first 16 weeks (with results provided as implant stability quotients [ISQs]). Marginal bone levels were assessed via radiographs.
RESULTS
Forty patients each received a single 4.0-mm diameter dental implant between 2004 and 2007. One implant failure occurred in Lekholm and Zarb type 4 bone with insertion torque value (ITV) of < 8.1 Ncm; the cumulative success rate was 97.5%. All implants, when classified by bone and loading type, increased in stability over time, with a minor reduction of 1.3 ISQ units seen at 4 weeks in the immediate loading group. The mean marginal bone loss over 3 years was 0.22 mm. The mean ITVs at implant placement for bone types 1 and 2 (grouped together), 3, and 4 were 32, 17, and 10, respectively, and were significantly different (P < .05).
CONCLUSIONS
ITV was a good objective measure of bone type. Using an ITV of 20 Ncm as the determinant for immediate loading and an ITV of 10 Ncm or greater as the determinant for early loading provided long-term success for this implant and led to no negative changes in tissue response. All bone type groups and loading groups showed no reduction in stability during the first 4 months of healing.
影响因子：
4.6
作者：
Stanford, CM;Brand, RA
通讯作者：
Brand, RA