Alternate metal framework designs for the metal ceramic prosthesis to enhance the esthetics
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PURPOSE. The objective of the present study was to evaluate the effect of five different metal framework designs on the fracture resistance of the metal-ceramic restorations. MATERIALS AND METHODS. For the purpose of this study, the central incisor tooth was prepared, and the metal analogue of it and a master die were fabricated. The counter die with the 0.5 mm clearance was used for fabricating the wax patterns for the metal copings. The metal copings with five different metal framework designs were designed from Group 1 to 5. Group 1 with the metal collar, Group 2, 3, 4 and 5 with 0 mm, 0.5 mm, 1 mm and 1.5 mm cervical metal reduction respectively were fabricated. Total of fifty metal ceramic crown samples were fabricated. The fracture resistance was evaluated with the Universal Testing Machine (Instron model No 1011, UK). The basic data was subjected to statistical analysis by ANOVA and Student’s t-test. RESULTS. Results revealed that the fracture resistance ranged from 651.2 to 993.6 N/m2. Group 1 showed the maximum and Group 5 showed the least value. CONCLUSION. The maximum load required to fracture the test specimens even in the groups without the metal collar was found to be exceeding the occlusal forces. Therefore, the metal frameworks with 0.5 mm and 1 mm short of the finish line are recommended for anterior metal ceramic restoration having adequate fracture resistance.
Abstract
PURPOSE. The objective of the present study was to evaluate the effect of five different metal framework designs on the fracture resistance of the metal-ceramic restorations. MATERIALS AND METHODS. For the purpose of this study, the central incisor tooth was prepared, and the metal analogue of it and a master die were fabricated. The counter die with the 0.5 mm clearance was used for fabricating the wax patterns for the metal copings. The metal copings with five different metal framework designs were designed from Group 1 to 5. Group 1 with the metal collar, Group 2, 3, 4 and 5 with 0 mm, 0.5 mm, 1 mm and 1.5 mm cervical metal reduction respectively were fabricated. Total of fifty metal ceramic crown samples were fabricated. The fracture resistance was evaluated with the Universal Testing Machine (Instron model No 1011, UK). The basic data was subjected to statistical analysis by ANOVA and Student’s t-test. RESULTS. Results revealed that the fracture resistance ranged from 651.2 to 993.6 N/m2. Group 1 showed the maximum and Group 5 showed the least value. CONCLUSION. The maximum load required to fracture the test specimens even in the groups without the metal collar was found to be exceeding the occlusal forces. Therefore, the metal frameworks with 0.5 mm and 1 mm short of the finish line are recommended for anterior metal ceramic restoration having adequate fracture resistance.
참고문헌 (30)
- Rosenstiel SF, "Contemporary fixed prosthodontics. 3rd ed" (2001), Elsevier publishers
- Anusavice KJ, "Philip’s science of dental materials. 11th ed" (2003), Elsevier publishers
- Brecker SC, "Porcelain baked to gold a new medium in prosthodontics", J Prosthet Dent, 6, pp.801~810 (1956)
- Goodacre CJ, "The collarless metal-ceramic crown", J Prosthet Dent, 38, pp.615~622 (1977)
- Warpeha WS Jr, "Design and technique variables affecting fracture resistance of metal-ceramic restorations", J Prosthet De, 35, pp.291~298 (1976)
- O'Boyle KH, "An investigation of new metal framework design for metal ceramic restorations", J Prosthet Dent, 78, pp.295~301 (1997)
- Prince J, "The esthetic metal-ceramic margin: a comparison of techniques", J Prosthet Dent, 50, pp.185~192 (1983)
- Sozio RB, "A precision ceramic-metal restoration with a facial butted margin", J Prosthet Dent, 37, pp.517~521 (1977)
- Toogood GD, "Technique for establishing porcelain margins", J Prosthet Dent, 40, pp.464~466 (1978)
- Vryonis P, "A simplified approach to the complete porcelain margin", J Prosthet Dent, 42, pp.592~593 (1979)
- Hamaguchi H, "Marginal distortion of the porcelain- bonded-to-metal complete crown: an SEM study", J Prosthet Dent, 47, pp.146~153 (1982)
- Prince J, "The all-porcelain labial margin for ceramometal restorations: a new concept", J Prosthet Dent, 50, pp.793~796 (1983)
- Oram DA, "Fracture of ceramic and metalloceramic cylinders", J Prosthet Dent, 52, pp.221~230 (1984)
- Anusavice KJ, "Stress distribution in metal-ceramic crowns with a facial porcelain margin", J Dent Res, 66, pp.1493~1498 (1987)
- Richter-Snapp K, "Change in marginal fit as related to margin design, alloy type, and porcelain proximity in porcelain-fused-to-metal restorations", J Prosthet Dent, 60, pp.435~439 (1988)
- Hinrichs RE, "Apparent density and tensile strength of materials for facially butted porcelain margins", J Prosthet Dent, 63, pp.403~407 (1990)
- Belles DM, "Effect of metal design and technique on the marginal characteristics of the collarless metal ceramic restoration", J Prosthet Dent, 65, pp.611~619 (1991)
- Campbell SD, "Thermal cycling distortion of metal ceramics: Part I-Metal collar width", J Prosthet Dent, 67, pp.603~608 (1992)
- Lund PS, "The effect of porcelain veneer extension on strength of metal ceramic crowns", Int J Prosthodont, 5, pp.237~243 (1992)
- Boyle JJ Jr, "Marginal accuracy of metal ceramic restorations with porcelain facial margins", J Prosthet Dent, 69, pp.19~27 (1993)
- Smith TB, "In vitro fracture behavior of ceramic and metal-ceramic restorations", J Prosthodont, 3, pp.138~144 (1994)
- Lehner CR, "Variable reduced metal support for collarless metal ceramic crowns: a new model for strength evaluation", Int J Prosthodont, 8, pp.337~345 (1995)
- Gardner FM, "In vitro failure load of metal-collar margins compared with porcelain facial margins of metal-ceramic crowns", J Prosthet Dent, 78, pp.1~4 (1997)
- Ku CW, "Comparison of the fracture strengths of metal-ceramic crowns and three ceromer crowns", J Prosthet Dent, 88, pp.170~175 (2002)
- Ulusoy M, "Fracture resistance of five different metal framework designs for metal-ceramic restorations", Int J Prosthodont, 15, pp.571~574 (2002)
- Gibbs CH, "Occlusal forces during chewing and swallowing as measured by sound transmission", J Prosthet Dent, 46, pp.443~449 (1981)
- Silver M, "An evaluation and comparison of porcelain-fused-to-cast metals", J Prosthet Dent, 10, pp.1055~1064 (1960)
- Nielsen JP, "Calculation of interfacial stress in dental porcelain bonded to gold alloy substrate", J Dent Res, 51, pp.1043~1047 (1972)
- Hinrichs RE, "Apparent density and tensile strength of materials for facially butted porcelain margins", J Prosthet Dent, 63, pp.403~407 (1990)
- Waltimo A, "A novel bite force recorder and maximal isometric bite force values for healthy young adults", Scand J Dent Res, 101, pp.171~175 (1993)