Karadas Muhammet, Çağlar İpek
Department of Restorative Dentistry, Recep Tayyip Erdogan University, Rize, Turkey.
Department of Prosthetic Dentistry, Recep Tayyip Erdogan University, Rize, Turkey.
Lasers Med Sci. 2017 Jul;32(5):967-974. doi: 10.1007/s10103-017-2194-x. Epub 2017 Mar 30.
The aim of this study was to evaluate the effect of Er:YAG laser irradiation on the micro-shear bond strength of self-etch adhesives to the superficial dentin and the deep dentin before and after thermocycling. Superficial dentin and deep dentin surfaces were prepared by flattening of the occlusal surfaces of extracted human third molars. The deep or superficial dentin specimens were randomized into three groups according to the following surface treatments: group I (control group), group II (Er:YAG laser; 1.2 W), and group III (Er:YAG laser; 0.5 W). Clearfil SE Bond or Clearfil S Bond was applied to each group's dentin surfaces. After construction of the composite blocks on the dentin surface, the micro-shear bond testing of each adhesive was performed at 24 h or after 15,000 thermal cycles. The data were analyzed using a univariate analysis of variance and Tukey's test (p < 0.05). Laser irradiation in superficial dentin did not significantly affect bond strength after thermocycling (p > 0.05). However, deep-dentin specimens irradiated with laser showed significantly higher bond strengths than did control specimens after thermocycling (p < 0.05). Thermocycling led to significant deterioration in the bond strengths of all deep-dentin groups. The stable bond strength after thermocycling was measured for all of the superficial-dentin groups. No significant difference was found between the 0.5 and 1.2 W output power settings. In conclusion, the effect of laser irradiation on the bond strength of self-etch adhesives may be altered by the dentin depth. Regardless of the applied surface treatment, deep dentin showed significant bond degradation.
本研究的目的是评估铒钇铝石榴石（Er:YAG）激光照射对自酸蚀粘结剂在热循环前后与表层牙本质和深层牙本质的微剪切粘结强度的影响。通过磨平拔除的人第三磨牙的咬合面来制备表层牙本质和深层牙本质表面。根据以下表面处理方法，将深层或表层牙本质标本随机分为三组：第一组（对照组）、第二组（Er:YAG激光；1.2W）和第三组（Er:YAG激光；0.5W）。将Clearfil SE Bond或Clearfil S Bond应用于每组的牙本质表面。在牙本质表面构建复合树脂块后，在24小时或15000次热循环后对每种粘结剂进行微剪切粘结测试。使用单因素方差分析和Tukey检验（p<0.05）对数据进行分析。热循环后，表层牙本质中的激光照射对粘结强度没有显著影响（p>0.05）。然而，热循环后，接受激光照射的深层牙本质标本的粘结强度显著高于对照标本（p<0.05）。热循环导致所有深层牙本质组的粘结强度显著降低。所有表层牙本质组在热循环后都测量到了稳定的粘结强度。在0.5W和1.2W输出功率设置之间未发现显著差异。总之，激光照射对自酸蚀粘结剂粘结强度的影响可能因牙本质深度而改变。无论采用何种表面处理，深层牙本质都显示出显著的粘结降解。
