Effect of different composite resins on the curing depth and bonding strength in tooth tissue

Objective: To explore the effects of different composite resins on the curing depth and bonding strength in tooth tissue,and provide the basis for the selecting appropriate resin to repair the teeth.Methods: Ninety molars were randomly divided into three groups in vitro,and the three groups were repaired with Esthet-X,Charisma and Z350 resins,respectively.Each group was subdivided into two groups,and the two groups were solidified with Halogen and LED light,respectively,and cohered with Single Bond.The curing depth and bonding strength of all teeth were measured.Results: The differences of the curing depth between three kinds of composite resin were statistically significant(P<0.01).The curing depth of teeth repaired with Esthet-X and Charisma resin,and solidified with Halogen lamp and LED lamp were higher than that of Z350(P<0.01).The differences of the bonding strength between three kinds of composite resins were statistically significant(P<0.01).The bonding strength of Esthet-X,Charisma and Z350 resin gradually decreased(P<0.05).Conclusions: The curing depths of three kinds of composite resin are different,and the curing depth of Esthet-X and Charisma resin are better than that of traditional Z350 resin.The curing depth of LED lamp is better than that of Halogen lamp.Using the same binder,the bonding strength of Esthet-X,Charisma and Z350 resin gradually decrease.