Influence of polymerization mode on flexural properties of esthetic resin luting agents

Lu, Huan; Mehmood, Afifa; Chow, Alice; Powers, John M.

doi:10.1016/j.prosdent.2005.09.016

« Previous Next »Journal of Prosthetic Dentistry
Volume 94, Issue 6 , Pages 549-554, December 2005

Influence of polymerization mode on flexural properties of esthetic resin luting agents

Huan Lu, DDS, PhD
- Assistant Professor, Department of Restorative Dentistry, Director, Biomaterials Research Laboratory, Center for Dental Research, Loma Linda University School of Dentistry
- Reprint requests to: Dr Huan Lu, Department of Restorative Dentistry, Center for Dental Research, Loma Linda University School of Dentistry, 11092 Anderson St, Rm 1211, Loma Linda, CA 92350, Fax: 909-558-0270
Afifa Mehmood, DDS
- Research Assistant, Department of Restorative Dentistry and Biomaterials, University of Texas Dental Branch at Houston
Alice Chow, PhD
- Senior Research Assistant, Outcomes Assessment and Biostatistical Services, University of Texas Health Science Center at Houston
John M. Powers, PhD
- Professor, Department of Restorative Dentistry and Biomaterials, and Director, Houston Biomaterials Research Center, University of Texas Dental Branch at Houston

Loma Linda University School of Dentistry, Loma Linda, Calif; Department of Restorative Dentistry and Biomaterials, Dental Branch, University of Texas Health Science Center at Houston, Houston, Tex

Statement of problem

Dual-polymerized esthetic resin luting agents have become popular. However, it is not clear whether the autopolymerized versions of such products have adequate strength to meet clinical requirements.

Purpose

The aim of this study was to investigate the effect of different polymerization modes on the flexural properties of esthetic resin luting agents.

Material and methods

Ten esthetic resin luting agents were studied. Materials with 3 polymerization modes (dual, auto, and light) were Appeal, Calibra, Illusion, Lute-It, and Variolink-II; those with 2 polymerization modes (dual and auto) were Bistite-II-DC, Cement-It-C&B, Clearfil-DC-Cement, Linkmax, and Nexus2-Dual-Syringe. Five flexural strength specimens (2 × 2 × 25 mm) were made for every available polymerization mode for each material. The specimens were stored in distilled water for 24 hours at 37°C. The specimens were then tested for flexural strength (MPa) and flexural modulus (GPa) using the 3-point bending method on a universal material testing machine at a cross-head speed of 0.5 mm/min. Data were analyzed by Kruskal-Wallis and Mann-Whitney tests (α=.05).

Results

Flexural strength values were the highest for dual-polymerized Nexus2-Dual-Syringe (155 MPa), whereas the values were lowest for autopolymerized Bistite-II-DC (56 MPa) and light-polymerized Appeal (63 MPa). Flexural moduli values ranged from 4.3 to 10.0 GPa. The polymerization mode and luting agent influenced flexural strength and modulus significantly (P<.05).

Conclusion

Dual-polymerized resin luting agents had higher or equal flexural strength compared to the autopolymerized mode. All the groups tested passed the flexural strength requirement of the ISO 4049 specification.