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Effect of gap dimension on wear resistance of luting agents
K Shinkai1, S Suzuki, K F Leinfelder
1Department of Operative Dentistry, The Nippon Dental University, School of Dentistry at Niigata, Japan.
Purpose:
To examine the correlation between horizontal gap width and wear depth of luting resin cements and a glass ionomer used with resin composite inlays.
Materials And Methods:
A cylindrical cavity (4 x 3 mm) was made on the occlusal surface of molars. Four specimens were prepared for each luting agent. The samples were subjected to a three-body wear test for 400,000 cycles. The wear values of both composite and luting agents were determined by profilometric tracings to the nearest 2 micrometers. The relationship between gap width and wear depth was confirmed by linear regression analysis.
Results:
Significant relationships existed amongst gap width, cement wear and type of cement. The effects were considerably less pronounced with microfilled cements.