Effect of calcium phosphate cement on bond strength and bacteriostasis of composite resin after repair
Objective To explore the effect of calcium phosphate cement(CPC)on bond strength and bacteriostasis of com-posite resin after repair.Methods A total of 60 third permanent molars were selected from the First Affiliated Hospital of Xinjiang Medical University from January to May 2023 for the extration of impacted wisdom teeth,maxillofacial caries were prepared according to the requirements.There were 40 in vitro teeth used for bonding strength test after resin restoration,and 20 in vitro teeth used for bacteriostatic activity test.Forty in vitro teeth were randomly divided into four groups,A1,B1,C,and D1,with 10 teeth in each group,group A1 was washed with distilled water,coated with single bond universal(SBU)and then filled with composite resin;group B12％compound chlorhexidine(CHX)was rinsed dentin,coated with SBU and then filled with composite resin;group C1 2％CPC rinsed dentin,coated SBU and then filled with composite resin;group D1 of distilled water at cleaning essence,coating composite resin after 2％mixture of CPC and SBU landfill,groups of micro ten-sile strength were calculated after cutting test.Twenty in vitro teeth were randomly divided into four groups,A2,B2,C2 and D2,with 5 teeth in each group.The samples of groups A2,B2,C2 and D2 were prepared according to the above steps,the sam-ples were sterilized by UV lamp irradiation for 2 h,and 20 µl of 1 x 106 CFU s/m Streptococcus mutans UA159 bacterial solution was applied to BH1 agar plates.After 24 h of cultivation,the size of the antibacterial ring were measured.Results The bond strength of groups C1 and D1 under the conditions of standing for 24 h in water and water bath aging were higher than those of groups A1 and Bi,and the differences were statistically significant(P＜0.05).There was no statistically signifi-cant difference in the bond strength between groups C1 and D1 under the conditions of standing for 24 h in water and water bath aging(P＞0.05).The diameter of antibacterial ring in A2 group was 0 mm,and there was no statistical significance in the diameter of antibacterial ring in B2,C2 and D2 groups(P＞0.05).Conclusion CPC can enhance the bond strength of composite resin to repair caries,delay aging and prevent secondary caries.
万方数据
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