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Orthodontic bonding to porcelain--bond strength and refinishing
G A Smith1, P McInnes-Ledoux, W R Ledoux
1Louisiana State University.
Summary
Orthodontic bonding to porcelain requires surface treatment. Roughening and silane application significantly improve bond strength, offering clinically successful results for dental restorations.
Area of Science:
- Dental Materials Science
- Orthodontic Engineering
- Surface Chemistry
Background:
- Glazed porcelain surfaces present challenges for resin-based orthodontic bonding due to poor resin penetration.
- Effective bonding protocols are crucial for the longevity and success of orthodontic appliances attached to porcelain restorations.
Purpose of the Study:
- To evaluate the bond strengths of two orthodontic composite materials to various treated porcelain surfaces.
- To assess the impact of thermocycling on bond strength.
- To analyze the surface characteristics of refinished porcelain.
Main Methods:
- Sixty glazed porcelain disks were treated with Silane (S), roughening and silane (RS), or roughening (R).
- Acid-etched enamel served as a control group.
- Specimens were bonded with Concise or System 1, stored in water or thermocycled, and tested for shear bond strength.
Main Results:
- Both surface treatment and composite material significantly affected bond strengths (P < 0.01 and P < 0.05, respectively).
- Thermocycling did not significantly impact bond strength (P > 0.05).
- Acid-etched enamel/Concise yielded the highest bond strength (17.4 MN/m²), followed by S/Concise (11.1 MN/m²). RS treatments showed moderate bond strengths, while roughening alone resulted in the lowest values.
Conclusions:
- Roughening porcelain surfaces combined with silane treatment provides clinically acceptable bond strengths for orthodontic bonding.
- While refinishing systems smoothed the surfaces, they did not restore the glazed appearance.
- The combination of roughening and silane treatment is recommended for enhanced orthodontic adhesion to porcelain.