对经铒钇铝石榴石（Er:YAG）和钕钇铝石榴石（Nd:YAG）激光照射的人牙本质上基于环氧树脂的封闭剂黏附力的体外研究。

Ex vivo study of the adhesion of an epoxy-based sealer to human dentine submitted to irradiation with Er : YAG and Nd : YAG lasers.

作者信息

Sousa-Neto M D, Silva Coelho F I, Marchesan M A, Alfredo E, Silva-Sousa Y T C

机构信息

Faculty of Dentistry, University of Ribeirão Preto, Ribeirão Preto, SP, Brazil.

出版信息

Int Endod J. 2005 Dec;38(12):866-70. doi: 10.1111/j.1365-2591.2005.01027.x.

DOI:10.1111/j.1365-2591.2005.01027.x

PMID:16343112

Abstract

AIM

To evaluate the adhesion of an epoxy-based sealer to human dentine submitted to irradiation with Er : YAG or Nd : YAG laser at various parameters.

METHODOLOGY

Ninety maxillary canine teeth were sectioned transversely at the cemento-enamel junction and at the root tip to leave an 8-mm-long cylinder. The tooth specimen was centred in a metallic ring (16 mm diameter and 8 mm height) and embedded in acrylic resin. The root canals were prepared using a low-speed handpiece and a conical diamond bur, which was attached to a paralleling device. This bur was lowered to a depth previously determined by a silicone stop. Specimens were divided into nine groups: group I, dentine was treated with 2 mL of 17% EDTAC for 5 min. Groups II-V were irradiated with Er : YAG laser at the following parameters: group II - 8 Hz and 200 mJ input (120 mJ output); group III - 8 Hz and 400 mJ input (240 mJ output); group IV - 16 Hz and 200 mJ input (120 mJ output); group V - 16 Hz and 400 mJ input (240 mJ output). Groups VI-IX were irradiated with Nd : YAG laser at the following parameters: group VI - 10 Hz and 1 W input (0.4 W output); group VII - 10 Hz and 2 W input (0.8 W output); group VIII - 15 Hz and 1 W input (0.4 W output); group IX - 15 Hz and 2 W input (0.8 W output). The root canals were filled with an epoxy-based root canal sealer and submitted to a push-out test.

RESULTS

Statistical analysis showed significant differences (P < 0.01) between Er : YAG and Nd : YAG laser treatments at the higher frequencies compared with 17% EDTAC. Greater adhesion values were obtained for groups IV and V (Er : YAG laser) and groups VIII and IX (Nd : YAG laser), which were statistically different from groups II and III (Er : YAG laser) and groups VI and VII (Nd : YAG laser). Treatment with only 17% EDTAC had the lowest adhesion values.

CONCLUSIONS

An increase in frequency, independent of power settings, of the lasers used in this study increased adhesion of an epoxy-based root canal sealer.

摘要

目的

评估在不同参数下，基于环氧树脂的封闭剂与经铒：钇铝石榴石（Er：YAG）或钕：钇铝石榴石（Nd：YAG）激光照射的人牙本质之间的黏附力。

方法

90颗上颌尖牙在牙骨质-釉质界和根尖处横向切割，留下8毫米长的圆柱体。将牙齿标本置于金属环（直径16毫米，高8毫米）中心，并用丙烯酸树脂包埋。使用低速手机和连接在平行装置上的锥形金刚砂车针预备根管。该车针下降至先前由硅橡胶阻挡器确定的深度。标本分为9组：I组，牙本质用2毫升17%乙二胺四乙酸（EDTAC）处理5分钟。II-V组用Er：YAG激光以以下参数照射：II组-8赫兹，输入200毫焦（输出120毫焦）；III组-8赫兹，输入400毫焦（输出240毫焦）；IV组-16赫兹，输入200毫焦（输出120毫焦）；V组-16赫兹，输入400毫焦（输出240毫焦）。VI-IX组用Nd：YAG激光以以下参数照射：VI组-10赫兹，输入1瓦（输出0.4瓦）；VII组-10赫兹，输入2瓦（输出0.8瓦）；VIII组-15赫兹，输入1瓦（输出0.4瓦）；IX组-15赫兹，输入2瓦（输出0.8瓦）。用基于环氧树脂的根管封闭剂充填根管，并进行推出试验。

结果

统计分析显示，与17%EDTAC相比，在较高频率下，Er：YAG和Nd：YAG激光治疗之间存在显著差异（P<0.01）。IV组和V组（Er：YAG激光）以及VIII组和IX组（Nd：YAG激光）获得了更高的黏附值，与II组和III组（Er：YAG激光）以及VI组和VII组（Nd：YAG激光）在统计学上有差异。仅用17%EDTAC处理的黏附值最低。