Cardoso Marcio Vivan, Coutinho Edurado, Ermis R Banu, Poitevin André, Van Landuyt Kirsten, De Munck Jan, Carvalho Rubens C R, Lambrechts Paul, Van Meerbeek Bart
Leuven BIOMAT Research Cluster, Department of Conservative Dentistry, School of Dentistry, Oral Pathology and Maxillo-Facial Surgery, Catholic University of Leuven, Belgium.
J Adhes Dent. 2008 Feb;10(1):25-33.
In light of the concept of minimally invasive dentistry, erbium lasers have been considered as an alternative technique to the use of diamond burs for cavity preparation. The purpose of this study was to assess the bonding effectiveness of adhesives to Er,Cr:YSGG laser-irradiated dentin using irradiation settings specific for cavity preparation.
Fifty-four midcoronal dentin surfaces, obtained from sound human molars, were irradiated with an Er,Cr:YSGG laser or prepared with a diamond bur using a high-speed turbine. One etch-and-rinse (Optibond FL/Kerr) and three self-etching adhesives (Adper Prompt L-Pop/3M ESPE, Clearfil SE Bond/Kuraray, and Clearfil S3 Bond/Kuraray) were used to bond the composite to dentin. The microtensile bond strength (microTBS) was determined after 24 h of storage in water at 37 degrees C. The Kruskal-Wallis test was used to determine pairwise statistical differences (p < 0.05). Prepared dentin surfaces, adhesive interfaces, and failure patterns were analyzed using a stereomicroscope and Field-emission gun Scanning Electron Microscopy (Feg-SEM).
Significantly lower microTBS was observed to laser-irradiated than to bur-cut dentin (p < 0.05), irrespective of the adhesive employed. Feg-SEM photomicrographs of lased dentin revealed an imbricate patterned substrate and the presence of microcracks at the dentin surface.
Morphological alterations produced by Er,Cr:YSGG laser-irradiation adversely influence the bonding effectiveness of adhesives to dentin.
鉴于微创牙科的概念，铒激光已被视为一种替代使用金刚石车针进行窝洞预备的技术。本研究的目的是使用特定于窝洞预备的照射参数，评估粘合剂与铒铬钇石榴石（Er,Cr:YSGG）激光照射的牙本质之间的粘结效果。
从健康人磨牙获取54个牙冠中部牙本质表面，用Er,Cr:YSGG激光照射或用高速涡轮机安装的金刚石车针制备。使用一种酸蚀冲洗粘结剂（Optibond FL/Kerr）和三种自酸蚀粘结剂（Adper Prompt L-Pop/3M ESPE、Clearfil SE Bond/可乐丽和Clearfil S3 Bond/可乐丽）将复合材料粘结到牙本质上。在37℃水中储存24小时后测定微拉伸粘结强度（microTBS）。使用Kruskal-Wallis检验确定两两之间的统计学差异（p<0.05）。使用体视显微镜和场发射枪扫描电子显微镜（Feg-SEM）分析制备的牙本质表面、粘结剂界面和失败模式。
无论使用何种粘结剂，与车针切割的牙本质相比，激光照射的牙本质的microTBS显著降低（p<0.05）。激光照射牙本质的Feg-SEM显微照片显示有叠瓦状图案的基底以及牙本质表面存在微裂纹。
Er,Cr:YSGG激光照射产生的形态学改变对粘结剂与牙本质之间的粘结效果有不利影响。
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