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Paper Information

Journal:   JUNDISHAPUR SCIENTIFIC MEDICAL JOURNAL   SUMMER 2007 , Volume 6 , Number 2 (53); Page(s) 153 To 158.
 
Paper: 

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.
 
* DEPARTMENT OF OPERATIVE AND ESTHETIC DENTISTRY, SCHOOL OF DENTISTRY, JUNDISHAPUR UNIVERSITY OF MEDICAL SCIENCES, AHWAZ
 
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.

 
Keyword(s): MICRO HARDNESS, LIGHT-CURE COMPOSITE, METAL MATRIX, TRANSPARENT MATRIX, BIO-GLASS, LIGHT TIP
 
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