Tabrizi Reza, Nazhvanai Ali Dehghani, Farahmand Mohammad Mahdi, Pourali Sara Yasour, Hosseinpour Sepanta
School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran.
Dent Res J (Isfahan). 2017 Sep-Oct;14(5):331-335. doi: 10.4103/1735-3327.215963.
The aim of this study was to assess the effect of increasing the drilling speed and depth during implant site preparation on bone viability.
In this prospective cohort study, participants were divided into four groups based on the speed and depth of drilling at the first molar site in the mandible. Participants underwent drilling at Group 1: 1000 rpm and 10 mm depth, Group 2: 1500 rpm and 10 mm, Group 3: 1000 rpm and 13 mm, and Group 4: 1500 rpm and 13 mm. Obtained specimens were assessed histologically to the qualitative measurement of bone viability, and the percentage of vital bone were evaluated by histomorphometric analysis. ANOVA was used to compare age and the mean percentage of vital bone and Tukey's test as was applied for pairwise comparison of groups.
A total of 100 participants were studied in four groups (25 subjects in each group). Histological evaluation revealed a low level of bone viability maintenance in all groups. Histomorphometric analysis showed the mean percentage of vital bone was 9.5 ± 3.91% in Group 1, 8.86 ± 3.84% in Group 2, 8.32 ± 3.80% in Group 3, and 4.27 ± 3.22% in Group 4. A significant difference was noted in the mean percentage of bone viability among the four groups ( = 0.001).
It seems that increasing the drilling speed or depth during dental implant site preparation does not affect the mean percentage of cell viability, while the increase in both depth and speed may decrease the percentage of viable cells.
本研究旨在评估种植位点预备过程中提高钻孔速度和深度对骨活力的影响。
在这项前瞻性队列研究中，根据下颌第一磨牙位点的钻孔速度和深度将参与者分为四组。参与者在第1组：1000转/分钟和10毫米深度、第2组：1500转/分钟和10毫米、第3组：1000转/分钟和13毫米、第4组：1500转/分钟和13毫米的条件下进行钻孔。对获取的标本进行组织学评估以定性测量骨活力，并通过组织形态计量分析评估活骨百分比。采用方差分析比较年龄和活骨平均百分比，并应用Tukey检验进行组间两两比较。
共对四组中的100名参与者进行了研究（每组25名受试者）。组织学评估显示所有组的骨活力维持水平较低。组织形态计量分析显示，第1组活骨平均百分比为9.5±3.91%，第2组为8.86±3.84%，第3组为8.32±3.80%，第4组为4.27±3.22%。四组之间的骨活力平均百分比存在显著差异（P = 0.001）。
似乎在牙种植位点预备过程中提高钻孔速度或深度不会影响细胞活力的平均百分比，而深度和速度同时增加可能会降低活细胞的百分比。
