Epasinghe Don Jeevanie, Yiu Cynthia Kar Yung
Department of Applied Oral Sciences, Faculty of Dentisty, The University of Hong Kong, Prince Philip Dental Hospital, Hong Kong, China.
Department of Pediatric Dentistry, Faculty of Dentistry, The University of Hong Kong, Prince Philip Dental Hospital, Hong Kong, China.
J Investig Clin Dent. 2018 Feb;9(1). doi: 10.1111/jicd.12276. Epub 2017 Jun 13.
Dentine affected by amelogenesis imperfecta (AI) is histologically altered due to loss of hypoplastic enamel and becomes hypermineralized. In the present study, we examined the effect of additional acid etching on microtensile bond strength of a self-etch adhesive to AI-affected dentine.
Flat coronal dentine obtained from extracted AI-affected and non-carious permanent molars were allocated to two groups: (a) Clearfil SE Bond (control); and (b) Clearfil SE Bond and additional etching with 34% phosphoric acid for 15 seconds. The bonded teeth were sectioned into .8-mm beams for microtensile bond strength testing, and stressed to failure under tension. The bond strength data were analyzed using two-way analysis of variance (dentine type and etching step) and Student-Newman-Keuls multiple comparison test (P<.05). Representative fractured beams from each group were examined under scanning electron microscopy.
Both factors, dentine substrate (P<.001) and etching step (P<.05), and their interactions (P<.001), were statistically significant. Additional etching had an adverse effect on the bond strength of Clearfil SE Bond to normal dentine (P<.005), and no significant improvement was found for AI-affected dentine (P=.479).
Additional acid etching does not improve the bond strength of a self-etch adhesive to AI-affected dentine.
由于釉质发育不全（AI）导致的牙本质组织学改变，牙本质因发育不全的釉质缺失而发生矿化过度。在本研究中，我们检测了额外酸蚀对自酸蚀粘结剂与AI影响的牙本质微拉伸粘结强度的影响。
从拔除的AI影响的非龋恒磨牙获得的平坦冠部牙本质被分为两组：（a）Clearfil SE Bond（对照组）；（b）Clearfil SE Bond并额外用34%磷酸酸蚀15秒。将粘结的牙齿切成0.8毫米的梁进行微拉伸粘结强度测试，并在拉伸下加载直至破坏。粘结强度数据采用双向方差分析（牙本质类型和酸蚀步骤）和Student-Newman-Keuls多重比较检验进行分析（P<0.05）。每组代表性的断裂梁在扫描电子显微镜下检查。
牙本质基质（P<0.001）和酸蚀步骤（P<0.05）这两个因素及其相互作用（P<0.001）均具有统计学意义。额外酸蚀对Clearfil SE Bond与正常牙本质的粘结强度有不利影响（P<0.005），而对于AI影响的牙本质未发现显著改善（P = 0.479）。
额外酸蚀不能提高自酸蚀粘结剂与AI影响的牙本质的粘结强度。
