Influence of application site of provisional cement on the marginal adaptation of provisional crowns.
BACKGROUND
Marginal discrepancies may lead to cement washout and marginal leakage, damaging periodontal and pulp tissues or causing premature loss of the restoration.


OBJECTIVE
This study evaluated the influence of application site of provisional cement on the marginal adaptation of provisional crowns.


METHODS
Four different application sites of provisional cement (Temp Bond NE, Kerr Corporation) were used for cementation of provisional crowns on phantom teeth prepared for full crown restorations, performing 4 experimental groups (n=10): cement applied to all internal surfaces of the crown (CAO); cement applied to all internal surfaces of the crown, except for the occlusal surface (CA); cement applied to the cervical crown margin (CM); and cement applied to the cervical tooth margin (TM). A comparison microscope (Mitutoyo America Corporation) was used to measure the distances between the internal tangents of two circular marks, one made on the provisional crown and one made apical to the tooth preparation margin, in areas corresponding to buccal, lingual, mesial and distal surfaces. Marginal adaptation was determined before and after cementation, with 0.0001-mm accuracy. Data were analyzed statistically by ANOVA and Tukey's test at 5% significance level.


RESULTS
Mean values of marginal opening obtained for each group were: CAO: 145 microm; CA: 67 microm; CM: 46 microm; TM: 34 microm. CA, CM and TM presented significantly lower marginal openings than CAO (p<0.05).


CONCLUSIONS
complete filling of the crown with provisional cement, including the occlusal surface, provided greater marginal discrepancies when compared to the other methods evaluated.
Cardoso
Mayra
M
Department of Prosthodontics and Dental Materials, Dental School, Federal University of Rio de Janeiro, Rio de Janeiro, RJ, Brazil.
Torres
Marcelo Ferreira
MF
Rego
Mariana Ribeiro de Moraes
MR
Santiago
Luiz Carlos
LC
D002484:Cementation / Q000379:methods*; D003442:Crowns; D003738:Dental Cements; D018772:Dental Marginal Adaptation; D003794:Dental Restoration, Temporary / Q000379:methods*; D019231:Tooth Preparation, Prosthodontic; D015034:Zinc Oxide
D003738:Dental Cements; C474196:Tempbond NE; D015034:Zinc Oxide