Lima Joyce Figueiredo Macedo de, Wajngarten Danielle, Islam Fariya, Clifford Johanna, Botta Ana Carolina
Department of Restorative Dentistry, Piracicaba School of Dentistry, Unicamp, Piracicaba, Sao Paulo, Brazil.
Department of Social Dentistry, Araraquara Dental School, Sao Paulo State University (UNESP), Araraquara, Sao Paulo, Brazil.
Eur J Dent. 2018 Oct-Dec;12(4):553-558. doi: 10.4103/ejd.ejd_239_18.
The main objective of this study is to assess the effect of the adhesive mode and chlorhexidine (CHX) on the microtensile strength of a universal bonding agent to sound and caries-affected dentins.
Six intact third molars and six decayed third molars were sectioned to obtain two middle dentin specimens per tooth. Prime and Bond Elect Universal (Dentsply) was applied to specimens in two different modes: Etch-and-rinse (ER, phosphoric acid for 15s) and self-etch (SE, no phosphoric acid). 2% CHX (Cavity Cleanser, Bisco) was applied to both dentins for 30 s. Specimens were randomly assigned into eight groups ( = 3) according to the treatments applied to sound and caries-affected dentins: SE; ER; SE + CHX; and ER + CHX. All specimens were restored with TPH Spectra High Viscosity (Dentsply) composite resin and sectioned to obtain specimens of 0.8 ± 0.1 mm. The microtensile bond strength test was conducted at 1 mm/min. The data were statistically analyzed by ANOVA and multiple comparisons' test (α = 0.05).
There was no significant difference between sound dentin and caries-affected dentin ( = 0.132). The highest bond strength was obtained with the application of the ER (31.81MPa). SE + CHX promoted the lowest bond strength with no statistical difference to ER + CHX ( > 0.05).
ER mode for the universal bonding agent yielded the highest bond strength to sound and caries-affected dentins. CHX reduced the bond strength to both dentins regardless the application of phosphoric acid.
The universal bonding agent increased the bond strength to sound and caries-affected dentins when applied by the ER mode.
本研究的主要目的是评估粘结方式和氯己定（CHX）对一种通用粘结剂与健康牙本质和龋损牙本质之间微拉伸强度的影响。
将六颗完整的第三磨牙和六颗龋坏的第三磨牙进行切片，每颗牙齿获取两个中层牙本质标本。将全酸蚀粘结剂Prime and Bond Elect Universal（登士柏公司）以两种不同方式应用于标本：酸蚀冲洗（ER，用磷酸处理15秒）和自酸蚀（SE，不用磷酸）。将2%的CHX（Cavity Cleanser，必思科公司）应用于两种牙本质30秒。根据对健康牙本质和龋损牙本质的处理方式，将标本随机分为八组（每组n = 3）：SE；ER；SE + CHX；以及ER + CHX。所有标本均用TPH Spectra高粘度（登士柏公司）复合树脂修复，然后切片得到0.8±0.1毫米的标本。以1毫米/分钟的速度进行微拉伸粘结强度测试。数据采用方差分析和多重比较检验进行统计学分析（α = 0.05）。
健康牙本质和龋损牙本质之间无显著差异（P = 0.132）。采用ER方式时粘结强度最高（31.81MPa）。SE + CHX的粘结强度最低，与ER + CHX无统计学差异（P>0.05）。
通用粘结剂的ER方式对健康牙本质和龋损牙本质产生的粘结强度最高。无论是否使用磷酸，CHX均降低了对两种牙本质的粘结强度。
通用粘结剂采用ER方式应用时，可提高对健康牙本质和龋损牙本质的粘结强度。
