Cho, Lee-Ra
(Department of Prosthodontics, College of Dentistry, Kangnung National University)
,
Yi, Yang-Jin
(Department of Prosthodontics, College of Dentistry, Kangnung National University)
Statement of problem. Luster loss in esthetic anterior ceromer restoration can occur and can be related with rough surface texture. Understanding durability of surface finishing methods like polishing and surface coating have critical importance. Purpose. This study evaluated the effect of tooth bru...
Statement of problem. Luster loss in esthetic anterior ceromer restoration can occur and can be related with rough surface texture. Understanding durability of surface finishing methods like polishing and surface coating have critical importance. Purpose. This study evaluated the effect of tooth brushing and thermal cycling on surface luster of 3 ceromer systems (Artglass, Targis, Sculpture) treated with different surface finishing methods. Material and methods. Seventy-two samples were prepared: 12 for control group Z100, 12 for Artglass, 24 for Targis, and 24 for Sculpture. Half of the Targis and Sculpture were polished according to the manufacturer's recommendation. The rest of the samples were coated with staining and glazing solution for Targis and Sculpture, respectively. All specimens were subjected to 10,000 cycles between $5^{\circ}C\;and\;55^{\circ}C$ with 30 seconds dwell time. Tooth brushing abrasion tests were performed in a customized tooth brushing machine with 500g back and forth for 20,000 cycle. Luster comparisons were based on grading after direct observation, and light reflection area was measured with Image analysis software. Results. All materials showed an decrease in luster grade after thermal cycling and tooth brushing. The post-tooth brushing results revealed that the glazed Sculpture had greater mean luster grade than did any other groups. While, the stained Targis group showed greatest changes after tooth brushing (p < 0.05), polished Targis and Sculpture did not show significant changes. However, glazed Sculpture showed discretely fallen out glaze resin. Conclusion. From the results of this study, all of the ceromer specimens were much glossy than control composite group after tooth brushing. coatings used for Targis and Sculpture had not durability for long term use.
Statement of problem. Luster loss in esthetic anterior ceromer restoration can occur and can be related with rough surface texture. Understanding durability of surface finishing methods like polishing and surface coating have critical importance. Purpose. This study evaluated the effect of tooth brushing and thermal cycling on surface luster of 3 ceromer systems (Artglass, Targis, Sculpture) treated with different surface finishing methods. Material and methods. Seventy-two samples were prepared: 12 for control group Z100, 12 for Artglass, 24 for Targis, and 24 for Sculpture. Half of the Targis and Sculpture were polished according to the manufacturer's recommendation. The rest of the samples were coated with staining and glazing solution for Targis and Sculpture, respectively. All specimens were subjected to 10,000 cycles between $5^{\circ}C\;and\;55^{\circ}C$ with 30 seconds dwell time. Tooth brushing abrasion tests were performed in a customized tooth brushing machine with 500g back and forth for 20,000 cycle. Luster comparisons were based on grading after direct observation, and light reflection area was measured with Image analysis software. Results. All materials showed an decrease in luster grade after thermal cycling and tooth brushing. The post-tooth brushing results revealed that the glazed Sculpture had greater mean luster grade than did any other groups. While, the stained Targis group showed greatest changes after tooth brushing (p < 0.05), polished Targis and Sculpture did not show significant changes. However, glazed Sculpture showed discretely fallen out glaze resin. Conclusion. From the results of this study, all of the ceromer specimens were much glossy than control composite group after tooth brushing. coatings used for Targis and Sculpture had not durability for long term use.
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가설 설정
1. Luster and light reflection area of ceromer specimens were affected by tooth brushing. However, ceromer showed higher gloss and light reflection than control composite group after tooth brushing.
3. Light reflection area did not coincide with the luster grade. Stained Targis showed great est light reflection area, followed by the polished Sculpture.
4. Surface coatings used for Targis and Sculpture had not durability for long term use. At the periphery, 응laze of Sculpture were fallen out discontinuously.
Goldstein demonstrated that the surface topog raphy of a composite and acrylic resin were altered by routine tooth brushing and were var ious depending on the type of dentifrice17. In this study, we selected the dentifrice with medi um abrasivity to simulate conventional oral envi ronment.
제안 방법
To date, however, no published studies have evaluated the e任ects of tooth brushing on the surface luster of ceromer treated by different technique. The purpose of this study was to determine the effect of tooth brush ing and thermal cycling on surface luster of 3 ceromer systems treated with different surface fin ishing methods.
After curing, the specimens were stored for a ininimum 3 days in air at room temperature and finally in deionized water for 7 days. The surfaces of all specimens were metal- lographically polished(Automat, Buhler, Germany) with 200, 400 grit and to a final finish with 600 grit silicone carbide paper under running water.
대상 데이터
The material used was three A2 shade dentin ceromer and Z100 composite resin as a control group (Table 2). The material was filled in split- ted metal mold(6(radius) x 2.
These specimens were polymerized according to manufacturer s instruc tions. Tw이ve specimens of Artglass and con trol group and 24 specimens of Targis and Sculpture were made. After curing, the specimens were stored for a ininimum 3 days in air at room temperature and finally in deionized water for 7 days.
데이터처리
Data on luster grade and reflected surface area were analyzed using one-way ANOVA to deter mine whether significant differences existed at the 95% confidence level. When differences were significant, multiple comparison test was done by Scheffe's method (a<0.
05). Then, comparison of the luster value of the before and after testing was done using the Student s t-test.
confidence level. When differences were significant, multiple comparison test was done by Scheffe's method (a<0.05). Then, comparison of the luster value of the before and after testing was done using the Student s t-test.
성능/효과
2. Glazed Sculpture had the greatest mean luster, while the stained Targis group showed high est luster changes after tooth brushing. Sculpture groups showed higher gloss than Targis groups irrespective of finishing meth ods.
후속연구
Miscellaneous color change might affect the luster grade. Further studies to develop the method of comparing lus ter objectively are needed. Moreover, all the pol ishing methods used in 놔study were originally designed for composite materials and not for the ceromer material.
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