AN IN-VITRO COMPARISON OF MICROHARDNESS OF LIGHT-CURED RESIN COMPOSITES IN CLASS II CAVITIES BY FOUR RESTORATION CURING TECHNIQUES

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GHARI ZADEH N.; ZAHERI T.; HAGHIGHIZADEH M.H.

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Journal: Jundishapur Scientific Medical Journal Year:2007 | Volume:6 | Issue:2 (53) Page(s): 153-158

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Title

AN IN-VITRO COMPARISON OF MICROHARDNESS OF LIGHT-CURED RESIN COMPOSITES IN CLASS II CAVITIES BY FOUR RESTORATION CURING TECHNIQUES

Author(s)

GHARI ZADEH N. | ZAHERI T. | HAGHIGHIZADEH M.H. | Issue Writer Certificate

Keywords

MICRO HARDNESSQ3

LIGHT-CURE COMPOSITEQ3

METAL MATRIXQ3

TRANSPARENT MATRIXQ3

BIO-GLASSQ3

LIGHT TIPQ3

Abstract

Objective: Problems such as recurrent caries, pulp reaction and marginal micro leakage occur in posterior resin composite restorations because of insufficient MICRO HARDNESS of resin composite. The purpose of this in-vitro study is comparing microhardness of light-cured composites in class 2 cavities by four restoration curing techniques. Subjects and Methods: Standardized class II cavities in mesial was made in forty non carious, upper human premolars. Each tooth was mounted with artificial teeth in acrylic resin and divided randomly into four treatment groups. Group 1: METAL MATRIX with wooden wedge and irradiation from occlusal and after that removing matrix and irradiation from bucal and lingual. Group 2: TRANSPARENT MATRIX with reflective wedge and irradiation from bucal and lingual. Group 3: METAL MATRIX with wooden wedge and irradiation from occlusal using LIGHT TIP which was connected to tip of light-cure unit. Group 4: METAL MATRIX with wooden wedge and irradiation from occlusal using narrow cylindrical BIO-GLASS for light transmitting from occlusal to gingival. The teeth were sectioned mesio-distally through the center of the restoration with diamond disk. The samples were embedded in epoxy resin. Vickers hardness was assessed in nine point 100, 500, 2500 microns from gingival and as far as 100, 750, 1300 microns from axial wall. The data was statistically analyzed by ANOVA. Mann- Whitney test was performed to compare the groups with each other at < 0.05 significance level.Results: Group 2 showed the most hardness which was significantly different from other groups. Group 1 showed the least hardness.Conclusion: The results obtained in this study indicated that using METAL MATRIX with wooden wedge is not suitable compared with TRANSPARENT MATRIX with reflective wedge. But because of limitations of transparent matrices and wedges such as stiffness and overhang formation, using light conducting instruments with METAL MATRIX and wooden wedge results in more composite hardness.

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APA: Copy

GHARI ZADEH, N., ZAHERI, T., & HAGHIGHIZADEH, M.H.. (2007). AN IN-VITRO COMPARISON OF MICROHARDNESS OF LIGHT-CURED RESIN COMPOSITES IN CLASS II CAVITIES BY FOUR RESTORATION CURING TECHNIQUES. JUNDISHAPUR SCIENTIFIC MEDICAL JOURNAL, 6(2 (53)), 153-158. SID. https://sid.ir/paper/384853/en

Vancouver: Copy

GHARI ZADEH N., ZAHERI T., HAGHIGHIZADEH M.H.. AN IN-VITRO COMPARISON OF MICROHARDNESS OF LIGHT-CURED RESIN COMPOSITES IN CLASS II CAVITIES BY FOUR RESTORATION CURING TECHNIQUES. JUNDISHAPUR SCIENTIFIC MEDICAL JOURNAL[Internet]. 2007;6(2 (53)):153-158. Available from: https://sid.ir/paper/384853/en

IEEE: Copy

N. GHARI ZADEH, T. ZAHERI, and M.H. HAGHIGHIZADEH, “AN IN-VITRO COMPARISON OF MICROHARDNESS OF LIGHT-CURED RESIN COMPOSITES IN CLASS II CAVITIES BY FOUR RESTORATION CURING TECHNIQUES,” JUNDISHAPUR SCIENTIFIC MEDICAL JOURNAL, vol. 6, no. 2 (53), pp. 153–158, 2007, [Online]. Available: https://sid.ir/paper/384853/en

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