Evaluation of effects of porcelain firing on the marginal fit changes of porcelain fused-to- metal crown fabricated utilizing two different margin designs and two commercially available base metal alloys
J. res. dent
; 4(3): 67-72, may-jun.2016.
Article
in En
|
LILACS-Express
| LILACS
| ID: biblio-1362948
Responsible library:
BR1916.9
ABSTRACT
Aim:
To find the marginal fit of the porcelain fused to metal crowns by two different margin designs (shoulder and chamfer) and two commercially available base metal alloys. Material andMethods:
Tooth preparation of first central incisor for porcelain-fused-to-metal crown with shoulder margin and second incisor for porcelain-fused-to-metal crown with chamfer margin was done. Wax pattern of the same was prepared. Impression of both prepared ivorine incisors was made by light body impression material and poured with pattern resin. Both the patterns were invested and casted with cobalt chromium alloy for making master dies. Two wax patterns of unprepared central incisors were fabricated, one with shoulder margin and another with chamfer margin. These patterns were then cut back to the size of the coping. Four rings were invested. In each ring ten patterns, five with shoulder margin and five with deep chamfer margin were sprued together to ensure that each group would pass through the same investing and casting procedure, followed by ceramic firing and measurement.Results:
Marginal fit change or marginal discrepancy (before and after firing) between the groups was highly significant.Conclusions:
Veneered crowns exhibited highly significant marginal distortion than non- veneered copings after porcelain firing. Shoulder margin is better in minimizing marginal discrepancy compared to deep chamfer margin. Marginal discrepancy is less when cerabond base metal alloy is used with shoulder margin as compared to commend base metal alloy used for shoulder margin.
Full text:
1
Collection:
01-internacional
Database:
LILACS
Language:
En
Journal:
J. res. dent
Journal subject:
ODONTOLOGIA
/
Sa£de Bucal
Year:
2016
Document type:
Article
Affiliation country:
India
Country of publication:
Brazil