Professor, Laser Research Center of Dentistry (LRCD), Dentistry Research Institute, Tehran University of Medical Sciences, Tehran, Iran.
Associate Professor, Laser Research Center in Medical Sciences (LRCMS), AJA University of Medical Sciences, Tehran, Iran.
Implant Dent. 2018 Jun;27(3):311-316. doi: 10.1097/ID.0000000000000751.
This study aimed to investigate and compare temperature change during implant decontamination with different laser types (carbon dioxide [Co2]/diode/neodymium-doped yttrium aluminum garnet [Nd:YAG]/erbium-doped yttrium aluminum garnet [Er:YAG]/antimicrobial photodynamic therapy [aPDT]).
Sixty implants were inserted into a bone block cut from a sheep's mandible. A 3 × 8 mm vertical lesion was made at the buccal of each implant. The bone block was placed into a 37°C water bath to simulate the in vivo oral condition. A K-type thermocouple was placed in contact with the implant to register temperature changes at 3 points (apical/middle/coronal).
In the entire laser irradiations, the mean of temperature changes remains below 10°C. The apical temperature rise was higher than the coronal and middle regions (P < 0.05), and the apical temperature took longer time to reach the initial temperature (37°C) (P < 0.001). Temperature changes over 10°C occurred at the apical point of the implants with the Co2, Nd:YAG, and diode laser irradiations; however, only the Co2 laser reached the statistical significance in this regard (P < 0.05).
Our findings indicate the promising results of Er:YAG laser and aPDT in implant decontamination. Precaution should be taken in the application of Nd:YAG, diode, and especially Co2 lasers.
本研究旨在探讨和比较不同激光类型（二氧化碳[CO2]/二极管/掺钕钇铝石榴石[Nd：YAG]/掺铒钇铝石榴石[Er：YAG]/抗菌光动力疗法[aPDT]）在种植体消毒过程中的温度变化。
将 60 个种植体植入从绵羊下颌骨切下的骨块中。在每个种植体的颊侧制作一个 3×8mm 的垂直损伤。将骨块放入 37°C 的水浴中模拟体内口腔环境。将 K 型热电偶与种植体接触，在 3 个点（根尖/中间/冠部）记录温度变化。
在整个激光照射过程中，平均温度变化仍低于 10°C。根尖温度升高高于冠部和中部（P<0.05），根尖达到初始温度（37°C）的时间更长（P<0.001）。CO2、Nd：YAG 和二极管激光照射时，种植体根尖处的温度变化超过 10°C；然而，只有 CO2 激光在这方面达到了统计学意义（P<0.05）。
我们的研究结果表明，Er：YAG 激光和 aPDT 在种植体消毒方面具有良好的效果。在应用 Nd：YAG、二极管，特别是 CO2 激光时应谨慎。
