Sanabe Mariane Emi, Kantovitz Kamila Rosamiglia, Costa Carlos Alberto De Souza, Hebling Josimeri
São Paulo State University-UNESP, Araraquara School of Dentistry, Department of Orthodontics and Pediatric Dentistry, Rua Humaitá, 1680 Araraquara, São Paulo 14801-903, Brazil.
Am J Dent. 2009 Feb;22(1):37-42.
To investigate the influence of etching time on the degradation of resin-dentin bonds produced in primary teeth.
40 primary molars were randomly divided into four groups according to the adhesive system, Single Bond (SB) and Clearfil SE Bond (CSEB), and acid etching time. SB was applied to dentin after phosphoric acid etching for 15 or 7 seconds, whereas CSEB was applied after the application of SE Primer for 20 or 10 seconds. Resin composite crowns were built-up followed by the production of specimens with a cross-sectional area of 0.49 mm2, which were further divided according to the storage condition, 24 hours, 6 and 12 months in water. Data were submitted to ANOVA and Tukey tests (alpha=0.05).
After 24 hours there was no significant difference between bond strengths produced by the adhesive systems, irrespective of the acid etching time. Water storage for 6 and 12 months significantly reduced bond strengths of SB, especially when the dentin was acid etched for 15 seconds. For CSEB, no significant alteration in bond strength was seen up to the storage period of 12 months for both etching times.
研究酸蚀时间对乳牙中树脂-牙本质粘结降解的影响。
根据粘结系统（单键粘结剂（SB）和Clearfil SE粘结剂（CSEB））以及酸蚀时间，将40颗乳牙随机分为四组。在磷酸酸蚀15秒或7秒后将SB应用于牙本质，而在应用SE底漆20秒或10秒后应用CSEB。构建树脂复合冠，然后制作横截面积为0.49平方毫米的标本，再根据储存条件（在水中储存24小时、6个月和12个月）进一步划分。数据进行方差分析和Tukey检验（α=0.05）。
24小时后，无论酸蚀时间如何，粘结系统产生的粘结强度之间均无显著差异。在水中储存6个月和12个月会显著降低SB的粘结强度，尤其是当牙本质酸蚀15秒时。对于CSEB，在两种酸蚀时间下，直至储存12个月，粘结强度均未观察到显著变化。
