[Marginal adaptation after cementing of gold inlays cast by an experimental procedure. SEM analysis].
OBJECTIVE
Marginal adaptation is one of the most important factors in dental reconstructions. The aim of the present work was to evaluate with in vivo and in vitro studies the marginal precision and the microstructure of the gold cast inlays.


METHODS
For the in vivo analysis 10 patients were selected, while for the in vitro study 10 extracted teeth were used. The impressions were made by polyvinylsiloxane while the master cast was made by gypsum type IV. The inlays were cast in gold (JRVT Jensen) using an experimental procedure. After cementing, the margins of each inlay was burnished. To evaluate the marginal discrepancy of in vivo inlays, the replica technique was used, while for the in vitro analysis the serial slice cut technique was performed. All samples were processed for metallographic analysis using SEM.


RESULTS
The measured in vivo inlay marginal gap was 9,06+/-3,37 microns (mean+/-SD), while for in vitro inlay the marginal gap was of 10,47+/-2,09 microns (mean+/-SD). Metallographic analysis showed equiaxial grain of small dimension.


CONCLUSIONS
The results suggest that using the proposed casting technique it is possible to increase marginal adaptation and microstructural properties.
Traini
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T
Dipartimento di Scienze Odontostomatologhiche, Università degli Studi G. d'Annunzio, Chieti, Italy.
Di Iorio
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D
Murmura
G
G
Caputi
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S
D002133:Calcium Sulfate; D003735:Dental Casting Technique; D006046:Gold; D006801:Humans; D007284:Inlays; D008422:Materials Testing; D008669:Metallurgy / Q000379:methods*; D008855:Microscopy, Electron, Scanning; D011145:Polyvinyls; D016628:Replica Techniques; D012833:Siloxanes
D011145:Polyvinyls; D012833:Siloxanes; C034183:vinyl polysiloxane; D006046:Gold; D002133:Calcium Sulfate