Hajji Mohammad, Franzen Rene, Grümer Stefan, Modabber Ali, Nasher Riman, Prescher Andreas, Gutknecht Norbert
1 Department of Conservative Dentistry, Periodontology and Preventive Dentistry, RWTH Aachen University Hospital , Aachen, Germany .
2 Department of Oral and Maxillofacial Surgery, RWTH Aachen University Hospital , Aachen, Germany .
Photomed Laser Surg. 2016 Feb;34(2):61-7. doi: 10.1089/pho.2015.3981.
The purpose of this study was to compare the conventional trephine bur and the Erbium,chromium: yttrium-scandium-gallium-garnet (Er,Cr:YSGG) laser in removing implants in terms of the volume of removed bone, duration of the procedure, and morphological changes on the bone surface.
Three human mandibles were utilized, and four implants were inserted in each mandible using a drilling handpiece and burs. The implants were divided into two groups (n = 6) in which two implants from each mandible were removed using a trephine bur running at 1200 rounds per minute (rpm) with water irrigation. The remaining implants (n = 6) were removed with Er,Cr:YSGG laser (power 6 W, frequency 20 Hz, pulse duration 50 μs, water 60, air 30). The volume of bone loss was calculated by filling the holes with mercury and measuring its volume. The preparation time was measured with a digital stopwatch and the postoperative bone surfaces were examined under a scanning electron microscope (SEM).
The laser group exhibited a smaller amount of bone loss than the trephine bur group, whereas the latter required a shorter time of preparation. SEM revealed empty trabecular spaces with no signs of carbonization and well-defined edges in the laser group, whereas the trephine group displayed a surface covered with a smear layer and microcracks.
The Er,Cr:YSGG laser provides superior results over the trephine bur in terms of bone preservation, thermal damage, and cutting efficiency.
本研究旨在比较传统环钻和铒铬：钇钪镓石榴石（Er,Cr:YSGG）激光在去除种植体时的骨去除量、手术持续时间以及骨表面形态变化。
使用了三块人类下颌骨，每块下颌骨使用钻孔手机和车针植入四枚种植体。将种植体分为两组（n = 6），每组中每块下颌骨的两枚种植体使用每分钟转速为1200转（rpm）并带有水冲洗的环钻去除。其余种植体（n = 6）使用Er,Cr:YSGG激光（功率6W，频率20Hz，脉冲持续时间50μs，水60，空气30）去除。通过用汞填充孔洞并测量其体积来计算骨丢失量。使用数字秒表测量准备时间，并在扫描电子显微镜（SEM）下检查术后骨表面。
激光组的骨丢失量比环钻组少，而环钻组所需的准备时间更短。扫描电子显微镜显示激光组的小梁间隙为空，无碳化迹象且边缘清晰，而环钻组的表面覆盖有玷污层和微裂纹。
在骨保存、热损伤和切割效率方面，Er,Cr:YSGG激光比环钻具有更优异的效果。
