Bond strength of contemporary luting agents to human dentin
EDJ-Egyptian Dental Journal. 2004; 50 (3 Part I): 1285-1290
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EMRO
Purpose: This in-vitro study investigated the durability of shear bond strength [SBS] of recently introduced luting agents to human dentin
Materials and Methods: One-hundred and twenty lower molars were stored in 1% Thymol solution. The occlusal surface was prepared to a flat dentin surface. The molars were divided into six groups each of 20 specimens. Translucent plastic rings were filled with the following luting agents and luted to the prepared specimens, self-adhesive compomer luting cement, hybrid glass ionomer cement in past form and conventional glass ionomer. Bonding procedures were created according to the manufacturer instructions for each luting agent. One day after luting, 20 specimens of each luting agent were stored in water bath for 24 hours. The other 20 specimens of each luting agent were stored in water bath for 3 months and thermocycled for 10000 cycles. Shear force was applied to each specimen at the junction of the plastic ring/dentin interlace using a knife-edge rod at a cross head speed of 0.5mm/min in a universal testing machine. Non parametric methods. Kruskal-Wallis and Mann-Whitney tests at p [0.05 were used for statistical analysis
Results: Medians [SBS] in MPa before and after thermalcycling are self-adhesive compomer luting cement, [CLC. 20. 413 MPa]: hybrid glass ionomer cement, [HGI, 22,14,6 MPa] and conventional glass innomer cemnt [CGI, 17.8 8.7 MPa]. There was no statistically significant difference in the median SBS of CLC and GIP before and alter storage in water and thermalcycling, however median SBS of CLC and HGI was significantly higher than median SBS of CGI before and after thermalcycling. On the other hand long term storage in water and thermalcycling significantly decreased SBS of CLC, HGI and CGI to human dentin
Clinical Implication: Hybrid glass ionomer and sell-adhesive compomer luting cements are preferred for luting indirect restorations
Materials and Methods: One-hundred and twenty lower molars were stored in 1% Thymol solution. The occlusal surface was prepared to a flat dentin surface. The molars were divided into six groups each of 20 specimens. Translucent plastic rings were filled with the following luting agents and luted to the prepared specimens, self-adhesive compomer luting cement, hybrid glass ionomer cement in past form and conventional glass ionomer. Bonding procedures were created according to the manufacturer instructions for each luting agent. One day after luting, 20 specimens of each luting agent were stored in water bath for 24 hours. The other 20 specimens of each luting agent were stored in water bath for 3 months and thermocycled for 10000 cycles. Shear force was applied to each specimen at the junction of the plastic ring/dentin interlace using a knife-edge rod at a cross head speed of 0.5mm/min in a universal testing machine. Non parametric methods. Kruskal-Wallis and Mann-Whitney tests at p [0.05 were used for statistical analysis
Results: Medians [SBS] in MPa before and after thermalcycling are self-adhesive compomer luting cement, [CLC. 20. 413 MPa]: hybrid glass ionomer cement, [HGI, 22,14,6 MPa] and conventional glass innomer cemnt [CGI, 17.8 8.7 MPa]. There was no statistically significant difference in the median SBS of CLC and GIP before and alter storage in water and thermalcycling, however median SBS of CLC and HGI was significantly higher than median SBS of CGI before and after thermalcycling. On the other hand long term storage in water and thermalcycling significantly decreased SBS of CLC, HGI and CGI to human dentin
Clinical Implication: Hybrid glass ionomer and sell-adhesive compomer luting cements are preferred for luting indirect restorations
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IMEMR
Idioma:
En
Revista:
Egypt. Dent. J.
Ano de publicação:
2004