Keywords
How to Cite
Abstract
This study evaluates the marginal adaptation of ceramic copings front of two finish lines and addition of ceramic. Hence, two master steel dies were milled with all-ceramic crowns preparation, one with a round shoulder finish line margin design, and the other with a deep chamfer. From each one of them, 15 copings were made, and the marginal discrepancy was evaluated in measuring microscope. The ceramic addition was accomplished in both groups with aid of a silicone matrix, and the discrepancies were measured again, obtaining the final mean gap values. The initial measurements resulted means of 44,0µm for deep chamfer and 24,0µm for the round shoulder, and the final measurements were 53,3µm for the deep chamfer and 27,4µm for the round shoulder. The data were submitted to the analysis of variance for verification of influence of the finish lines and application of the ceramic. When analyzed the interaction among the variables it was not observed statistical differences, but when comparing the two types of finish lines or the groups before and after ceramic addition, statistical differences were found. It is was concluded that the round shoulder finish line presents better values of marginal gap than deep chamfer and the addition of ceramic influences in the final gap values of marginal adaptation.References
Hunter AJ, Hunter AR. Gingival margins for crowns: a review and discussion. Part II: discrepancies and configurations. J Prosthet Dent 1990; 64: 636-42.
Björn AL, Björn H, Grkovic B. Marginal fit of restorations and its relation to periodontal bone level. II. Crowns. Odontol Revy 1970; 21: 337-46.
Guzman AF, Moore BK, Andres CJ. Resistance of four luting agents as a function of marginal gap distance, cement type, and restorative material. Int J Prosthod 1997; 10: 415-25.
Pober R et al. Compositional analysis of In-Ceram infusion glass [abstract 1179]. J Dent Res 1992; 71: 253.
Qualtrough AJE, Piddock V. Recent advances in ceramic materials and systems for dental restorations. Dent Update 1999; 26: 65-72.
Pera P, Gilodi S, Bassi F, Carossa S. In vitro marginal adaptation of alumina porcelain ceramic crowns. J Prosthet Dent 1994; 72: 585-90.
Pröbster L, Diehl J. Slip-casting alumina ceramics for crown and bridge restorations. Quintessence Int 1992; 23: 25-31.
Shearer B, Gough MB, Setchell DJ. Influence of marginal configuration and porcelain addition on the fit of In-Ceram crowns. Biomateriais 1996; 17: 1891-5.
Sorensen JA. A standardized method for determination of crown margin fidelity. J Prosthet Dent 1990; 64: 18-24.
Hoard RJ, Chiang PC, Hewlett ER, Caputo AA. Marginal discrepancy as related to margin design in porcelain-fused-toDicor restorations. Oral Health 1993; 83: 15-8.
Gemalmaz D, Alkumru HN. Marginal fit changes during porcelain firing cycles. J Prosthet Dent 1995; 73: 49-54.
Groten MS, Girthofer S, Probster L. Marginal fit consistency of copy-milled all-ceramic crowns during fabrication by light and scanning electron microscopic analysis in vitro. J Oral Rehabil 1997; 24: 871-81.
Sulaiman F, Chai J, Jameson LM, Wozniak WT. A comparison of the marginal fit of In-Ceram, IPS Empress, and Procera crowns. Int J Prosthodont 1997; 10: 478-84.
Holmes JR, Bayne SC, Holland GA, Sulik WD. Considerations in measurement of marginal fit. J Prosthet Dent 1989; 62: 405-8.
Christensen GJ. Porcelain-fused-to-metal vs. nonmetal crowns. J Am Dent Assoc 1999; 130: 409-11.
Campbell SD, Sirakian A, Pelletier LB, Giordano RA. Effects of firing cycle and surface finishing on distortion of metal ceramic castings. J Prosthet Dent 1995; 74: 476-81.
Christensen GJ. Marginal fit of gold inlay castings. J Prosthet Dent 1966; 16: 297-305 18. Hung SH, Hung KS, Eick JD, Chappel RP. Marginal fit of porcelain-fused-to-metal and two types of ceramic crowns. J Prosthet Dent 1990; 63: 26-31.
Weaver JD, Johnson GH, Bales DJ. Marginal adaptation of castable ceramic crowns. J Prosthet Dent 1991; 66: 747-53.
McLean JW, Fraunhofer JA. The estimation of cement film thickness by an in vivo technique. Br Dent J 1971; 131: 107-11.
The Brazilian Journal of Oral Sciences uses the Creative Commons license (CC), thus preserving the integrity of the articles in an open access environment.
Downloads
