PubMed · 398035
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J O Hollinger, E M Moore. 1979. Adhesion and dentin.. https://pubmed.ncbi.nlm.nih.gov/398035/
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STATEMENT OF PROBLEM: Poor retention is a common cause of failure for resin-bonded restorations. PURPOSE: This study evaluated the effect of the convergence angle of tooth preparations on retention of resin-bonded restorations, luted with adhesive and conventional resinous cements. MATERIAL AND METHODS: A total of 80 posterior retainers with four different tooth preparation angles were cemented with two different resinous cements, and retentive strength was measured. RESULTS: The results indicated that (1) increased tapering of tooth preparations resulted in loss of retention and this variable was statistically significant for both cements used when convergence angles exceeded 10 degrees and (2) sandblasted nickel-chromium retainers, combined with adhesive resins, should provide sufficient retention for posterior resin-bonded fixed partial dentures.
STATEMENT OF PROBLEM: Dental amalgam restorations have traditionally been retained in cavity preparations by surgical procedures called retention form. In this procedure healthy dental structure is usually removed to create adequate retention. The increasing use of bonding systems for restorative procedures may result in more conservative cavity preparations. PURPOSE: The purpose of this study was to evaluate the tensile bond strength of the amalgam to glass ionomer cement under the influence of three adhesive systems (Panavia-EX, Vidrion F fresh mix, and Alpha Seal). MATERIAL AND METHODS: The bonded assemblies were stored in an environment of 100% relative humidity and 37 degrees C for 24-hour and 30-day storage periods. The test specimen was loaded in tension to failure on a universal testing machine with a crosshead speed of 6 mm/min. RESULTS: The results revealed that in the 24-hour period without acid etch fresh Vidrion F and Panavia Ex adhesives were stronger than autopolymerizing sealant. Panavia Ex adhesive was stronger in the 24-hour period with acid etch. CONCLUSIONS: The 30-day period with acid etch revealed no statistical difference among the adhesives. In the 30-day period without acid etch, the fresh Vidrion F adhesive recorded the greatest tensile bond strength.