도재 소성 과정에서의 고온이 지르코니아 코어의 변연적합도에 미치는 영향
Influence of High Temperature of the Porcelain Firing Process on the Marginal Fit of Zirconia Core
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One factor for successful prognosis of finished dental prosthesis is good marginal fit. The purpose of this study in vitro investigation was to compare the marginal fit of all-ceramic crown before and after porcelain veneering, to evaluate the influence of high temperature of the porcelain firing on the fit. For this experiment, model of abutment tooth of maxillary right central incisor was prepared. Ten working models were produced. Ten zirconia cores were made by dental computer aided design/computer aided manufacturing system. The marginal fit of specimens were examined using silicone replica technique. Silicone replicas were sectioned four times and were measured through a digital microscope (x160). Marginal fit is a distance connected between edge end part of specimen and abutment margin. Each specimens was measured twice, the first measurement was done prior to veneering porcelain firing, while the second measurement was done after the porcelain firing to evaluate this process. Statistical analyses were performed with paired t-test. Mean±SD marginal fit was 60.8±14.2 mm for zirconia core and 86.1±13.3 mm for all-ceramic crown. They were statistically significant differences (p＜0.001). But all specimens showed a marginal fit where the gap widths ranged within the clinical recommendation (120 mm), all-ceramic crown production using the zirconia core was adequate.
Abstract
One factor for successful prognosis of finished dental prosthesis is good marginal fit. The purpose of this study in vitro investigation was to compare the marginal fit of all-ceramic crown before and after porcelain veneering, to evaluate the influence of high temperature of the porcelain firing on the fit. For this experiment, model of abutment tooth of maxillary right central incisor was prepared. Ten working models were produced. Ten zirconia cores were made by dental computer aided design/computer aided manufacturing system. The marginal fit of specimens were examined using silicone replica technique. Silicone replicas were sectioned four times and were measured through a digital microscope (x160). Marginal fit is a distance connected between edge end part of specimen and abutment margin. Each specimens was measured twice, the first measurement was done prior to veneering porcelain firing, while the second measurement was done after the porcelain firing to evaluate this process. Statistical analyses were performed with paired t-test. Mean±SD marginal fit was 60.8±14.2 mm for zirconia core and 86.1±13.3 mm for all-ceramic crown. They were statistically significant differences (p＜0.001). But all specimens showed a marginal fit where the gap widths ranged within the clinical recommendation (120 mm), all-ceramic crown production using the zirconia core was adequate.
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