Class II direct composite resin restorations with beta quartz glass-ceramic inserts

Division of Operative Dentistry, Department of Restorative and Preventive Dentistry, Loyola University, USA.
Quintessence international (Impact Factor: 0.95). 11/1993; 24(11):793-8.
Source: PubMed


With the increasing demand for esthetic posterior restorations, numerous techniques have been developed. The direct resin restoration has probably been used most extensively in Class II situations. Problems with Class II direct resin restorations include difficulty in developing proximal contact, occlusal wear, and polymerization shrinkage. Beta-quartz glass-ceramic inserts have been developed in an attempt to reduce the incidence of these potential problems. They can be placed in a one-appointment technique, are relatively inexpensive, and can readily be utilized by the clinician adept in placing Class II composite resin restorations.

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    ABSTRACT: Objectives. Electronic databases are not sufficiently up to date to provide comprehensive notation of the most recent literature for reference in developing scientificpapers. The objective of this summary was to identify and categonize the 1993 dental materials scientific literature that dealt with restorative dentistry. Methods. 17 primary journals were manually searched via the tables of contents, and 101 secondary journals were manually or electronically searched. Dental materials citations were categorized into 15 major sections and several subsections, excluding case reports and all the literature primarily related to dental implants or biomedical materials outside of dentistry. Results. This study identified 786 citations, the largest number being associated with glass ionomers and composites. Significance. This citation list provides a comprehensive source for review by academicians and researchers that bridges the gap between initial publication and electronic citation.
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    ABSTRACT: The purpose of this study was to evaluate the clinical performance of preformed beta-quartz glass-ceramic insert restorations. Nine Class I and 30 Class II beta-quartz glass-ceramic insert restorations were placed in 16 patients who were seen regularly by personnel at Umeå University Dental School. The California Dental Association criteria were used to evaluate the restorations at baseline, 6 months, and 1, 2, and 3 years after luting. The occurrence of postoperative sensitivity, the time taken to manufacture each restoration, and certain periodontal conditions were also evaluated. Sixty-nine percent of the restorations were rated satisfactory at the 3-year examination. During the follow-up period, 4 became loose and 7 were fractured or had flaking surfaces. Caries was registered in connection with 1 restoration. Excellent ratings were obtained for marginal integrity, anatomic form, surface, and color in 62%, 84%, 32%, and 44% of the restorations, respectively. There was no statistically significant difference in the occurrence of plaque and bleeding on probing in comparison with the controls. The mean overall time for placement was 38 minutes. The estimated survival rate (Kaplan-Meier) was 59% after 3.5 years. The quality of the beta-quartz glass-ceramic restorations in the present study was inferior to that presented in most earlier studies of ceramic or resin composite posterior restorations placed in patients treated at university clinics. Both the technique and the beta-quartz glass-ceramic inserts have to be evaluated in more long-term studies to assess the possibility of their serving as an alternative restorative technique.
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