Bonfante Estevam A, Janal Malvin N, Granato Rodrigo, Marin Charles, Suzuki Marcelo, Tovar Nick, Coelho Paulo G
Postgraduate Program in Dentistry, UNIGRANRIO University, School of Health Sciences, Duque de Caxias, RJ, Brazil.
Clin Oral Implants Res. 2013 Dec;24(12):1375-80. doi: 10.1111/clr.12010. Epub 2012 Aug 27.
Bone formation and maintenance around implants placed immediately after tooth extraction may be affected by implant surface treatment and compromise long-term esthetic results. This study morphometrically evaluated buccal bone loss and bone-to-implant contact (BIC) of four implant systems placed immediately after tooth extraction in a dog model.
The premolars of eight beagle dogs were bilaterally extracted with a full-thickness flap, and root-form dental implants were placed on the root extraction socket. Implants (n = 16 each) with different surface treatments were placed from sites 1 to 4 and alternated between animals to allow evaluation of the same number of implants at sites and evaluation time points. Implant surface treatments were as follows: anodized, discrete crystalline deposition, SLActive, and microblasted. The left and right side provided implants that stayed for 2 and 4 weeks, respectively. Submerged healing was allowed and bone-to-implant contact (BIC) and buccal bone loss were morphometrically measured. Linear mixed models (P < 0.05) were used to assess differences between groups, across time, and their interaction.
Buccal bone loss was observed to approximately double between 2 and 4 weeks (P = 0.01). BIC also increased between 2 and 4 weeks, by 20-25% (P = 0.01). These changes were statistically similar for each surface.
When placed immediately after tooth extraction, the evaluated histomorphometric parameters vary only with time.
拔牙后即刻植入种植体周围的骨形成和维持情况可能受到种植体表面处理的影响，并损害长期美学效果。本研究通过形态计量学评估了在犬模型中拔牙后即刻植入的四种种植系统的颊侧骨吸收和骨与种植体接触（BIC）情况。
对8只比格犬的前磨牙进行双侧全厚瓣拔牙，并在牙根拔除窝内植入根形牙种植体。将具有不同表面处理的种植体（每种n = 16）从部位1至4植入，并在动物之间交替，以便在各部位和评估时间点评估相同数量的种植体。种植体表面处理如下：阳极氧化、离散晶体沉积、SLActive和微喷砂。左侧和右侧分别提供留置2周和4周的种植体。允许进行潜行愈合，并通过形态计量学测量骨与种植体接触（BIC）和颊侧骨吸收情况。使用线性混合模型（P < 0.05）评估组间、不同时间及其交互作用之间的差异。
观察到颊侧骨吸收在2至4周之间增加了约一倍（P = 0.01）。BIC在2至4周之间也增加了20 - 25%（P = 0.01）。这些变化在每种表面上在统计学上相似。
拔牙后即刻植入时，所评估的组织形态计量学参数仅随时间变化。
