J W van Dijken1, P Hörstedt. 1. Department of Cardiology, Dental School, Umeå University, Sweden.
Abstract
OBJECTIVES: The marginal fit of tooth-coloured inlays luted with composite resin luting materials has been considered to be the weak link of the inlays. The marginal breakdown of 5-year-old direct composite resin inlays was evaluated by scanning electron microscopy. METHODS: Replica impressions were made of the occlusal, axial-proximal and accessible cervical-proximal margins of 21 inlays and the marginal quality was quantified. RESULTS: More than 84% of the total investigated length of the enamel/luting composite agent-luting composite/composite inlay interfaces revealed gap free margins. Proximal margins showed the largest breakdown at the enamel/composite resin interface, while the occlusal margin interfaces showed only a slight difference between the interfaces. The composite inlay and the luting composite resin showed a similar degree of wear in more than 50% of the evaluated marginal length. Medium gap width varied between 60 microns for the occlusal and axial-proximal and 87 microns for the cervical-proximal margins, with a range of 7.6-266 microns. CONCLUSIONS: The direct composite inlays investigated showed good marginal integrity after 5 years in clinical service.
OBJECTIVES: The marginal fit of tooth-coloured inlays luted with composite resin luting materials has been considered to be the weak link of the inlays. The marginal breakdown of 5-year-old direct composite resin inlays was evaluated by scanning electron microscopy. METHODS: Replica impressions were made of the occlusal, axial-proximal and accessible cervical-proximal margins of 21 inlays and the marginal quality was quantified. RESULTS: More than 84% of the total investigated length of the enamel/luting composite agent-luting composite/composite inlay interfaces revealed gap free margins. Proximal margins showed the largest breakdown at the enamel/composite resin interface, while the occlusal margin interfaces showed only a slight difference between the interfaces. The composite inlay and the luting composite resin showed a similar degree of wear in more than 50% of the evaluated marginal length. Medium gap width varied between 60 microns for the occlusal and axial-proximal and 87 microns for the cervical-proximal margins, with a range of 7.6-266 microns. CONCLUSIONS: The direct composite inlays investigated showed good marginal integrity after 5 years in clinical service.