Effect of tooth preparation and bonding agents on cementation of metal full crown / 中国基层医药

ABSTRACT

Objective To find out the effect of tooth preparation and bonding agents on cementation of metal full crown,to provide research basis for clinical practice of full crown restoration .Methods 60 dissociation teeth were randomly divided into six groups ,10 teeth in each group .Different adhesive materials or different polymerization angle were used in different groups ,the six groups were 3 polymerization angle zinc group ,3 polymerization angle glass ionomer group,3 polymerization angle resin cement group ,5 polymerization angle zinc group ,5 polymerization angle glass ionomer group ,and 5 polymerization angle resin cement group .In the first three groups ,polymerization angle was 3,and in the latter three groups ,polymerization angle was 5.The retentive force values of all groups were tested and compared.Results The metal crown retentive force of 3 polymerization angle zinc group[(198.5 ±11.6)N]was sig-nificantly better than that of 5 polymerization angle zinc group[(138.2 ±14.1)N](t=7.46,P0.05).Bonding zinc retention of 3 degree of polymerization group was (198.5 ±11.6)N,glass ionomer and resin cements were (302.7 ±19.2) N and (352.7 ±21.8) N.Bonding zinc retention of 5 degree of polymerization group was (138.2 ±14.1)N,glass ionomer and resin cements were (317.4 ± 23.8)N and (362.9 ±22.6) N.Different adhesives showed statistically significant effects on metal crown retentive force values of 3 polymerization angle groups and 5 polymerization angle groups (F=7.88,8.42,all P<0.05). Conclusion A suitable adhesive,standard operation can get the best cementation effect ,and improve clinical repair effect.