Guarnieri R, Miccoli G, Di Nardo D, D'Angelo M, Morese A, Seracchiani M, Testarelli L
Department of Oral and Maxillo-Facial Sciences, Sapienza University of Rome, Italy.
Clin Ter. 2020 Sep-Oct;171(5):e385-e392. doi: 10.7417/CT.2020.2245.
Marginal bone loss (MBL) represents an important indicator of peri-implant health and the measure of its level is considered a determining factor in the evaluation of the quality of survival. Aim of this study is to compare radiographic changes in the fractal and mesial/distal vertical dimensions of peri-implant trabecular bone of dental implants with a laser-ablated micron-scale modication (LAM) of collar surface after a 5-year follow-up period.
Thirty-four implants with LAM of collar surface (test group = TG) and 31 implants without LAM of collar surface (control group = CG) were placed in 45 non-smoking, periodontally healthy patients. Fractal and vertical dimensions of peri-implant trabecular bone were measured by comparing radiographs taken immediately after prosthesis delivery with those taken 3 years and 5 years after functional loading.
At the end of the 5-year follow-up, the MBL in the TG was 0.87±0.21 and 0.75±0.25 mm at the mesial and distal aspects, respectively, while a MBL of 2.05±0.25 mm at the mesial aspect and 2.01±0.34 mm at the distal site was recorded in the CG. A statistically significant difference was noted. In the TG the mean fractal dimension before loading was 1.4213±0.0525. It increased significantly to 1.4329±0.0479 at 3 years after loading and remained almost stable at 5 years after loading (1.4327±0.0291). In the CG the mean fractal dimension before loading was 1.4119±0.0414. It increased significantly to 1.4282±0.0324 at 3 years after loading and decreased significantly to 1.4111±0.0624 at 5 years after loading. At the end of the follow-up, differences between both study groups were statistically significant.
The increased fractal dimension and the reduced MBL around TG implants after 5 years of functional loading indicates a positive effect of a laser-ablated micron-scale modication of collar surface on peri-implant trabecular bone remodeling.
边缘骨丢失（MBL）是种植体周围健康的重要指标，其水平的测量被认为是评估种植体存活质量的决定性因素。本研究的目的是在5年随访期后，比较经激光消融微米级颈部表面改性（LAM）的牙种植体周围种植体小梁骨的分形和近中/远中垂直维度的影像学变化。
将34颗颈部表面有LAM的种植体（试验组=TG）和31颗颈部表面无LAM的种植体（对照组=CG）植入45名不吸烟、牙周健康的患者体内。通过比较义齿交付后立即拍摄的X线片与功能负载后3年和5年拍摄的X线片，测量种植体周围小梁骨的分形和垂直维度。
在5年随访结束时，TG组近中侧和远中侧的MBL分别为0.87±0.21和0.75±0.25mm，而CG组近中侧的MBL为2.05±0.25mm，远中侧为2.01±0.34mm。差异具有统计学意义。在TG组，加载前的平均分形维数为1.4213±0.0525。加载后3年显著增加至1.4329±0.0479，加载后5年几乎保持稳定（1.4327±0.0291）。在CG组，加载前的平均分形维数为1.4119±0.0414。加载后3年显著增加至1.4282±0.0324，加载后5年显著降低至1.4111±0.0624。随访结束时，两个研究组之间的差异具有统计学意义。
功能负载5年后，TG组种植体周围分形维数增加且MBL降低，表明激光消融微米级颈部表面改性对种植体周围小梁骨重塑有积极作用。
