Influence of casting on marginal fit of metal copings fabricated from wax or light-cured resin (In vitro study)
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Author(s)
Author(s)
Influence of casting on marginal fit of metal copings fabricated from wax or light-cured resin (In vitro study) Jawaher Shhada
Background: The marginal fit of dental casting is the major decisive factor in determining the success of restoration. Not only does the fit of casting depend on the method of fabrication, but also on the type of pattern material utilized, which is considered one of the essential variables.
Objectives: This study aimed at comparing the marginal fit of patterns fabricated from wax or light-cured resin on two bases: casting and after casting. It, furthermore, studied the change in the marginal gap between these two stages.
Material and methods: A total of 15 resin dies milled on computer-aided design and computeraided manufacturing system were used to prepare 30 patterns, which were fabricated using wax or light-cured resin. The marginal gaps were measured with a light microscope in 12 marginal points for each pattern; castings were fabricated using the lost wax technique. The marginal gaps were measured in the same points for each metal coping and their average was recorded.
Data were analyzed using t-Tests at a confidence level of α = 0.05.
Results: No statistically significant difference in the marginal gap observed between wax
and light-cured resin before casting (15.25±3.6, 13.83±2.85) or after casting (21.17±6.11,
19.25±3.95) respectively. The mean of marginal gap increased after casting in wax and lightcured resin groups, respectively. Its difference was statistically significant; still, the change in marginal gap was not statistically significant between the study groups.
Conclusions: Within the limitations of this in vitro study, it can be concluded that the marginal gap of patterns – copings fabricated from wax or light-cured resin – was within the range of clinical acceptability. Casting increased the marginal gap of copings fabricated from wax or lightcured resin although it was within the range of clinical acceptability. Using both of the materials to fabricate the patterns of cast coping gives approximate results in the marginal adaptation.
DOI: https://ysmu.am/v2/wp-content/uploads/2023/05/e8dcbef2-1.pdf The New Armenian Medical Journal Vol.15 (2021), Nо 1 53-58
