Koliniotou-Koumpia Eugenia, Kouros Pantelis, Zafiriadis Lazaros, Koumpia Effimia, Dionysopoulos Pavlos, Karagiannis Vassilis
Department of Operative Dentistry, Aristotle University of Thessaloniki, Greece.
Eur J Dent. 2012 Jan;6(1):16-23.
The shear bond strength of adhesives applied to dentin was investigated after irradiation with an erbium-doped yttrium aluminum garnet (Er:YAG) laser.
Superficial and deep dentin specimens from human molars were treated either with carbide bur or an Er:YAG laser. Two etch and rinse adhesives (Single Bond and XP Bond) and two self-etch adhesives (Prompt L-Pop and Xeno III) were employed to bond the composite. Shear bond strength (SBS) was determined after storage in water for 24 h using a universal testing machine with a crosshead speed of 0.5 mm/min. Failure patterns and modes were analyzed and evaluated using a stereomicroscope. In addition, samples were processed for Scanning Electron Microscopy SEM evaluation. A linear mixed model was used, and pairwise comparisons were made using the Bonferroni test.
Results showed significant differences between the levels of dentin treatment (p=.01) in carbide bur-cut dentin and lased dentin, as well as significant interaction effects due to the depth of dentin and the bonding system used. The etch and rinse adhesives bonded less effectively with lased dentin than with carbide bur-cut dentin, while self-etch adhesives bonded equally well with lased and bur-cut superficial dentin but much less effectively with lased deep dentin than with bur-cut deep dentin. SEM revealed a predominantly adhesive failure mode in laser-ablated fractured specimens, while a mixed failure mode was apparent in the bur-cut fractured specimens.
Cavities prepared by laser seem less receptive to adhesive procedures than conventional bur-cut cavities.
研究掺铒钇铝石榴石（Er:YAG）激光照射后应用于牙本质的粘结剂的剪切粘结强度。
用人磨牙的表层和深层牙本质标本，分别用硬质合金车针或Er:YAG激光进行处理。使用两种酸蚀冲洗粘结剂（Single Bond和XP Bond）和两种自酸蚀粘结剂（Prompt L-Pop和Xeno III）来粘结复合材料。在水中储存24小时后，使用十字头速度为0.5毫米/分钟的万能试验机测定剪切粘结强度（SBS）。使用体视显微镜分析和评估失败模式和方式。此外，对样本进行扫描电子显微镜（SEM）评估。使用线性混合模型，并使用Bonferroni检验进行成对比较。
结果显示，在硬质合金车针切割的牙本质和激光处理的牙本质中，牙本质处理水平之间存在显著差异（p = 0.01），并且由于牙本质深度和所使用的粘结系统存在显著的交互作用。酸蚀冲洗粘结剂与激光处理的牙本质的粘结效果不如与硬质合金车针切割的牙本质，而自酸蚀粘结剂与激光处理和车针切割的表层牙本质粘结效果相同，但与激光处理的深层牙本质的粘结效果远不如与车针切割的深层牙本质。SEM显示，激光消融骨折标本中主要为粘结失败模式，而车针切割骨折标本中则明显为混合失败模式。
与传统车针切割的窝洞相比，激光制备的窝洞似乎对粘结程序的接受性较差。
