Use of metal conditioners to improve bond strengths of autopolymerizing denture base resin to cast Ti–6Al–7Nb and Co–Cr

Shimizu, Hiroshi; Kurtz, Kenneth S.; Tachii, Yuzo; Takahashi, Yutaka

doi:10.1016/j.jdent.2005.05.002

« Previous Next »Journal of Dentistry
Volume 34, Issue 2 , Pages 117-122, February 2006

Use of metal conditioners to improve bond strengths of autopolymerizing denture base resin to cast Ti–6Al–7Nb and Co–Cr

Hiroshi Shimizu
- Division of Removable Prosthodontics, Department of Oral Rehabilitation, Fukuoka Dental College, 2-15-1 Tamura Sawara-ku, Fukuoka 814-0193, Japan
- Corresponding author. Tel.: +81 92 801 0411; fax: +81 92 801 0513.
Kenneth S. Kurtz
- International Program in Prosthodontics, Departments of Dentistry & Otolaryngology, Montefiore Medical Center/Albert Einstein College of Medicine, NYU College of Dentistry, 111 East 210th Street, Bronx NY 10467, USA
Yuzo Tachii
- Division of Removable Prosthodontics, Department of Oral Rehabilitation, Fukuoka Dental College, 2-15-1 Tamura Sawara-ku, Fukuoka 814-0193, Japan
Yutaka Takahashi
- Division of Removable Prosthodontics, Department of Oral Rehabilitation, Fukuoka Dental College, 2-15-1 Tamura Sawara-ku, Fukuoka 814-0193, Japan

Received 18 August 2004; accepted 11 May 2005.

Summary

Objective

The shear bond strengths of an autopolymerizing denture base resin to cast Ti–6Al–7Nb and Co–Cr alloys using three metal conditioners were investigated.

Methods

Ti–6Al–7Nb alloy and Co–Cr alloy discs were cast. The disc surfaces were air-abraded with 50μm alumina particles and treated with three metal conditioners (Alloy Primer; Cesead II Opaque Primer; Metal Primer II). An autopolymerizing denture base resin was applied on the discs within a hole punched in a piece of sticky tape and a Teflon ring to define the bonding area. All specimens were immersed in 37°C water for 24h. Half of the specimens were thermocycled up to 20,000 cycles. The shear bond strengths were determined at a crosshead speed of 1.0mm/min.

Results

Specimens treated with the three metal conditioners had significantly (p<0.05) improved shear bond strengths of the autopolymerizing denture base resin to both Ti–6Al–7Nb and Co–Cr. Although the bond strengths of the bonded Ti–6Al–7Nb specimens were higher than those of the Co–Cr alloy before thermocycling, the decrease in the bond strength of Ti–6Al–7Nb was considerably greater than that of the Co–Cr after thermocycling.

Conclusion

Significant improvements in bond strength of the autopolymerizing denture base resin to cast Ti–6Al–7Nb alloy and Co–Cr alloy were achieved through the application of Alloy Primer, Cesead II Opaque Primer and Metal Primer II. The bond durability to Ti–6Al–7Nb alloy was inferior to that to Co–Cr.

Keywords: Shear bond strength, Autopolymerizing denture base resin, Ti–6Al–7Nb alloy, Co–Cr alloy, Metal conditioner, Bond durability