Volume 8 Issue 12 (December, 2020)

Original Articles

Stereomicroscopic assessment of the marginal fit of metal copings fabricated by three different commercially available porcelain fused to metal alloys: An in vitro (Original Research) Study
Nikhil Bhardwaj, Harsh Parashar, Jatin Khippal, Deepesh Choudhary

Aim: To assess the marginal accuracy of metal margins fabricated with three commonly used alloys in the field of Prosthodontics. Marginal assessments were completed by using stereomicroscope. Materials and Methods: Total thirty samples were studied wherein ten samples were evaluated for each metal. All thirty metal copings were made on a customized metal die. In this study, authors selected three commercially available alloys used in the field of Prosthodontics i.e.; Mealloy, Star Loy N, Bellabond. All metal copings were made by routine investment and casting methods. Divesting and finishing was also done by standard methods. The customized die was prepared similar to the shape and dimension of mandibular first molar preparation. Marginal assessments were completed by using stereomicroscope at four different surfaces. Samples were placed at the testing platform of the microscope for space assessment and measurement. Mean gap value of the four tested metal surfaces were considered definitive for that sample. Statistical Analysis and Results: All the gathered details and values were tabulated and sent for statistical evaluation using statistical software Statistical Package for the Social Sciences version 21. The vertical marginal discrepancy data obtained were tabulated. For group I (Mealloy) copings, the mean vertical discrepancy was 58.053. For group II (Star Loy N) copings, the mean vertical discrepancy was 32.160. For group III (Bellabond) copings, the mean vertical discrepancy was 41.062. All dimensional related assessments were completed accurately by stereo microscope in micron. For group III (Bellabond), measured P value was significant (0.02). Conclusion: Within the limitations of the study, authors concluded that the vertical marginal discrepancy at the margin of the casting and the die was minimum for Star Loy N and maximum for Mealloy. Therefore, Star Loy N was the most suitable alloy for maintaining marginal health and preventing bacterial encroachments. Inferences of this study do not recommend the same for all ceramic restorations and other finish line configurations. Key words: Mealloy, Star Loy N, Bellabond, Dental casting, Marginal Fit

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