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ORIGINAL RESEARCH
Year : 2019  |  Volume : 11  |  Issue : 2  |  Page : 80-85

The influence of coping designs on labio-marginal towards fracture resistance of metal-porcelain restoration


1 Postgraduate Program in Prosthodontics, Faculty of Dentistry, Universitas Sumatera Utara, Medan, Indonesia
2 Department of Prosthodontics, Faculty of Dentistry, Universitas Sumatera Utara, Medan, Indonesia
3 Department of Mechanical Engineering, Faculty of Engineering, Universitas Sumatera Utara, Medan, Indonesia

Correspondence Address:
Chihargo
Jl. Alumni No. 2 Kampus USU, P. O. Box: 20155, Medan
Indonesia
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/jioh.jioh_5_19

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Aims: Metal-porcelain restoration on esthetic zones often results in an umbrella effect due to metal collar coping on the labiomarginal area. Therefore, metal collarless design on metal-porcelain restoration was indicated, yet it may influence the fracture resistance of the restoration. This study aimed to determine the effect of metal coping designs on the labiomarginal area against fracture resistance of metal-porcelain restoration. Materials and Methods: A total of 24 samples of metal-porcelain restorations from four designs were fabricated and cemented on 24 metal dies. The study was divided into four groups; Group A with metal collar design, Group B with modified metal collar design, Group C with metal collarless design, and Group D with modified metal collarless design. The measurement of fracture resistance was carried out using universal testing machine (Torsee UTM AMU-10, Tokyo, Japan) at a crosshead speed of 0.05 mm/minute. Loading point was applied at an angle of 45° until the porcelain layer fractured. Results: The mean value and standard deviation of fracture resistance are 2237.56 ± 183.83 N in Group A, 1934.34 ± 152.81 N in Group B, 2049.62 ± 162.58 N in Group C, and 2146.15 ± 210.75 N in Group D. Significant influence of fracture resistance on metal-porcelain restorations was found in all experimental groups (P < 0.05), and there were significant differences between Groups A and B and between Groups B and D (P < 0.05). Conclusion: Metal-porcelain restoration with modified metal collarless design can be an alternative restoration on esthetic zone with high fracture resistance and may be able to prevent umbrella effect on the labiomarginal area.


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