Title: Shear bond strength of amalgam reinforced with a bonding agent and/or dentin pins
Abstract: Statement of problem. The use of dentin pins can cause crazing in dentin. Bonding agents represent a more conservative approach to retention but may not ensure a comparable shear bond strength. Purpose. This study compared the shear bond strength of amalgam to dentin with the application of dentin pins, a bonding agent, and a combination of both forms of retention. Material and methods. Forty-five freshly extracted, intact molar teeth of similar size were ground flat approximately 2 mm coronal to the cemento-enamel junction and then embedded in acrylic resin blocks. The teeth were randomly divided into 3 groups of 15 specimens each. In group 1, Panavia-Ex was applied to exposed dentin surfaces, and the amalgam was condensed with a copper ring. In group 2, two Pinlock dentin pins were placed 3 mm apart; Panavia-Ex was applied to the dentin, and the amalgam was condensed. In group 3, two Pinlock pins were placed 3 mm apart, and the amalgam was condensed. All materials were mixed and applied according to the manufacturers' directions. After the amalgam had set for 10 minutes, the specimens were stored at 37°C for 24 hours, after which they were thermocycled 1500 times at 5° to 55°C with a dwell time of 30 seconds. Specimens then were loaded in shear mode in a universal testing machine at a crosshead speed of 0.5 mm/min until fracture occurred. A 1-way analysis of variance and a Tukey multiple range comparison test were used for statistical analysis (P<.05). Results. Significant differences were found among all groups. The highest bond strength (181.86 kg/cm2) was obtained for group 2 specimens, which were restored with 2 dentin pins and the bonding system tested. Conclusion. Within the limitations of this study, the combined use of dentin pins and Panavia-Ex significantly increased the retention of the amalgam core material. (J Prosthet Dent 2002;87:446-50.)
Publication Year: 2002
Publication Date: 2002-04-01
Language: en
Type: article
Indexed In: ['crossref', 'pubmed']
Access and Citation
Cited By Count: 9
AI Researcher Chatbot
Get quick answers to your questions about the article from our AI researcher chatbot