The effect of different power densities and method of exposure on the marginal adaptation of four light-cured dental restorative materials

Purpose: To determine whether marginal adhesion is sensitive to different irradiation parameters, we investigated the in vitro adhesion values of four dental resins on metal surfaces. Methods: Four groups of eight specimens each of Z250, Filtek flow, Dyract AP and Dyract flow were placed in pre-trea...

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Bibliographic Details
Published in:Biomaterials 2003-09, Vol.24 (20), p.3593-3598
Main Authors: Oberholzer, Theunis G., Pameijer, Cornelis H., Grobler, Sias R., Rossouw, Roelof J.
Format: Article
Language:English
Subjects:
Adhesion
Dental Marginal Adaptation
Dental resins
Dental Restoration, Permanent
Lighting - instrumentation
Lighting - methods
Materials Testing
Polymerization shrinkage
Resin Cements
Shear bond strengths
Shear Strength
Stainless Steel
Tissue Adhesions
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Summary:Purpose: To determine whether marginal adhesion is sensitive to different irradiation parameters, we investigated the in vitro adhesion values of four dental resins on metal surfaces. Methods: Four groups of eight specimens each of Z250, Filtek flow, Dyract AP and Dyract flow were placed in pre-treated stainless steel cavities and irradiated using different methods of exposure. The curing lights used were a Spectrum 800 halogen curing light at settings of 800 and 450 mW/cm 2 and an Optilux 501 ramping light. The maximum amount of push-out force required to displace the resin from the metal cavity was equated with adhesive value (shear bond strength). Comparisons (ANOVA, p0.0001) Comparing the fixed intensities, significant lower bond strength values were obtained at 800 mW/cm 2 compared to 450 mW/cm 2 ( p
ISSN:0142-9612
1878-5905
DOI:10.1016/S0142-9612(03)00211-4