The effect of Er,Cr:YSGG laser and air abrasion on shear bond strength of a fissure sealant to enamel

PurposeThe authors conducted an in vitro study to evaluate the shear bond strength of a fissure sealant to enamel pretreated with erbium, chromium: yttrium, scandium, gallium, garnet (Er, Cr: YSGG) laser or air abrasion followed by acid etching.MethodsThe authors sectioned extracted sound premolars mesiodistally and used the buccal and lingual surfaces for experimental analysis. They divided specimens randomly into three groups of 15 each according to the enamel surface pretreatment methods: group A, 37 percent phosphoric acid; group B, air abrasion followed by acid etching with 37 percent phosphoric acid; group C, irradiation with Er, Cr: YSGG laser followed by acid etching with 37 percent phosphoric acid. After applying a bonding system, the authors bonded cylinders of sealant to the enamel surfaces by using transparent gelatin tubes (0.7 millimeter in diameter and 1 mm in height) and then polymerized them. They stored all specimens in distilled water at 37°C for 24 hours. They tested shear bond strength by using a universal testing machine with a crosshead speed of 0.5 mm per second. The authors analyzed the data by means of one-way analysis of variance and Tukey-Kramer post hoc tests (α = .05).ResultsThe bond strength of group B specimens was statistically higher than those of group A and group C specimens (P < .05). The authors found no statistically significant differences in shear bond strength between surfaces treated with Er, Cr: YSGG laser and those treated with acid etching alone (P > .05).ConclusionPretreatment of enamel surfaces with air abrasion increased the bond strength of fissure sealant, but pretreatment with Er, Cr: YSGG laser did not increase the effectiveness of conventional acid etching of enamel in sealant bonds.     

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目的评价Er,Cr:YSGG激光照射对牙本质与玻璃离子水门汀间抗剪切黏结强度的影响。方法于2008年7月至12月,在中国医科大学口腔医院收集15颗因正畸拔除的无龋坏、无隐裂的完整离体前磨牙。将标本牙的颊侧与舌侧牙本质表面分别用Er,Cr:YSGG激光照射处理(实验组)和涡轮手机处理(对照组),经FX-Ⅱ玻璃离子水门汀充填及冷热循环后进行剪切力实验,计算标本牙的抗剪切黏结强度,体视显微镜下观察牙体组织的剪切断面。结果剪切力实验结果显示:实验组牙本质与充填材料间的抗剪切黏结强度显著高于对照组(P<0.05)。体视显微镜观察:实验组牙体组织的剪切断面凹凸不平,充填物残留更多;对照组则较光滑、平坦。结论Er,Cr:YSGG激光照射会增强牙本质与玻璃离子水门汀间的抗剪切黏结强度。     

Er:YAG激光和酸蚀作用于牙釉质表面后剪切强度的比较研究

目的 探讨Er:YAG激光照射对牙釉质表面的蚀刻效果,并与酸蚀效果进行比较研究.方法 2010年4-7月在山西医科大学选取40颗完整的人离体双尖牙,随机分为4组(每组各10颗牙),即酸蚀组(35%的磷酸),Er:YAG激光组(5Hz,100 mJ,0.5W),酸蚀加Er:YAG激光组,Er:YAG激光加酸蚀组.分别在牙...     

Comparison of shear bond strength of orthodontic brackets bonded to human teeth with and without fluorotic enamel: A systematic review and meta-analysis of experimental in vitro studies

The aim of this systematic review was to compare the shear bond strength (SBS) of orthodontic brackets bonded to human teeth with and without enamel fluorosis (EF) using conventional bonding interventions/techniques. An unrestricted search of indexed databases was performed with the following eligibility criteria: (a) human fluorotic teeth (experimental-group); (b) human teeth without fluorosis (control-group); (c) studies using phosphoric acid (PA) etching without air abrasion (AA), PA etching combined with AA, and application of self-etching primer (SEP) alone as bonding interventions/techniques and (d) measuring SBS in megapascals (MPa). Data screening, selection and extraction were performed by two reviewers. The risk of bias (rob) was assessed using the JBI Critical appraisal tool for Quasi-Experimental Studies. Meta-analyses were performed using a random effects model. The quality of available evidence was assessed using the Grading of Recommendations Assessment, Development and Evaluation approach. Ten in vitro studies were included. Subgroup analyses were performed for each intervention type. The SBS was significantly lower in fluorotic teeth when PA was used without AA (mean difference = 3.26 MPa, confidence interval: [1.00, 5.52]); and there were no significant differences for the PA combined with AA and SEP interventions. All studies had a low rob. The overall level of evidence was at best low. The SBS is lower in teeth with EF when traditional PA is used. No significant differences were found in SBS between teeth with and without EF when PA is used with AA or when SEP is used alone.