THE EFFECT OF THREE ABUTMENT TAPERS ON THE RETENTION OF FULL VENEER CROWN CEMENTED WITH THREE DIFFERENT LUTING AGENTS ON MAXILLARY FIRST PREMOLAR-AN INVITRO STUDY

Kala.S; Lylajam S; Harshakumar K

Volume : VI, Issue : VIII, August - 2017

THE EFFECT OF THREE ABUTMENT TAPERS ON THE RETENTION OF FULL VENEER CROWN CEMENTED WITH THREE DIFFERENT LUTING AGENTS ON MAXILLARY FIRST PREMOLAR-AN INVITRO STUDY

Kala. S, Lylajam S, Harshakumar K

Abstract :

Aims: To assess the effect of change in taper of the prepared abutment tooth on the retention of full veneer crown .Maxillary first premolars prepared at three different tapers namely 10 14 and 20 degrees for full veneer crown. The amount of force required for removal of the crown after cementation with zinc phosphate, polycarboxylate and glass ionomer are recorded. Statistical analysis is done to find out optimum value for abutment taper and also to find out the luting cement that provide maximum retention among the three.

Materials and Methods:In this study,18 freshly extracted maxillary first premolar teeth extracted for orthodontic treatment are used for full veneer crown preparation. A specially designed instrument is used for the standardization of crown preparation. .All the 18 samples were cemented with zinc phosphate cement and recorded the force required for crown removal. The crowns are cleaned and dried and test is repeated with polycarboxylate and glass ionomer cement. Statistical analysis was done with ANOVA.

Results:The crown cemented on abutment with 14⁰taper required maximum force for crown removal irrespective of type of the cementing medium employed. Among the three different luting cements employed, the crown cemented with polycarboxylate required maximum force for debonding.