Panahandeh Narges, Azarsina Mohadese, Ostad Hossein Niyayesh, Fekrazad Reza
Associate Professor, Dental Research Center, Research Institute of Dental Sciences, Dental School, Shahid Beheshti University of Medical Sciences. Tehran, Iran.
Assistant Professor, Department of Operative Dentistry, Dental School, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
J Lasers Med Sci. 2020 Fall;11(4):486-490. doi: 10.34172/jlms.2020.76. Epub 2020 Oct 3.
The present study aims to assess the microshear bond strength (µSBS) of composite to enamel treated with titanium tetrafluoride (TiF4 ) and CO laser irradiation. Fifteen human molars were sectioned and their enamel surfaces were abraded. The sections were randomly assigned to 5 groups (n=15): (CO); control group, (AP); treated with 1.23% acidulated phosphate fluoride (APF) for 4 minutes, (Ti); 4% TiF for 1 minute, (L+AP); CO laser irradiation (10.6 µm wavelength, 1 W peak power, 10 ms pulse duration, 500 ms repetition time, 0.2 mm beam spot size at the tissue level, 2 cm distance of handpiece tip to tissue surface (DSE, South Cores) followed by 1.23% APF, and (L+ Ti); 10.6μm CO laser irradiation followed by 4% TiF for one minute. Using Tygon tubes, Z250 (3M/ESPE) composite was bonded to the surface of the samples. The µSBS of composite to enamel was measured using a microtensile testing machine after 500 thermal cycles. The data were analyzed by one-way ANOVA and the Tukey HSD test ( <0.05). The mean µSBS was 20.66, 20.21, 13.44, 23.01, and 10.16 MPa in CO, AP, Ti, L+AP, and L+Ti groups respectively. Significant differences were observed between CO and Ti ( =0.026) and also CO and L+ Ti ( <0.0001). The application of TiF per se and after CO laser irradiation on enamel decreased the µSBS of composite to enamel; on the other hand, APF alone and after laser irradiation did not have any adverse effect on the µSBS of composite to enamel.
本研究旨在评估用四氟化钛（TiF4）和CO激光照射处理后的复合树脂与牙釉质之间的微剪切粘结强度（µSBS）。将15颗人类磨牙切片，磨除其牙釉质表面。切片随机分为5组（n = 15）：（CO）对照组；（AP）用1.23% 含氟磷酸（APF）处理4分钟；（Ti）用4% TiF处理1分钟；（L + AP）CO激光照射（波长10.6 µm，峰值功率1 W，脉冲持续时间10 ms，重复时间500 ms，组织水平光束光斑尺寸0.2 mm，手持件尖端到组织表面距离2 cm（DSE，South Cores）），然后用1.23% APF处理；（L + Ti）10.6 µm CO激光照射，然后用4% TiF处理1分钟。使用泰贡管将Z250（3M/ESPE）复合树脂粘结到样品表面。500次热循环后，使用微拉伸试验机测量复合树脂与牙釉质之间的µSBS。数据采用单因素方差分析和Tukey HSD检验（<0.05）进行分析。CO、AP、Ti、L + AP和L + Ti组的平均µSBS分别为20.66、20.21、13.44、23.01和10.16 MPa。在CO组和Ti组之间（= 0.026）以及CO组和L + Ti组之间（< 0.0001）观察到显著差异。在牙釉质上单独应用TiF以及在CO激光照射后应用TiF会降低复合树脂与牙釉质之间的µSBS；另一方面，单独使用APF以及在激光照射后使用APF对复合树脂与牙釉质之间的µSBS没有任何不利影响。
