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Bracket Bonding to All-Ceramic Materials with Universal Adhesives
Cecilia Goracci1, Giuseppe Di Bello1, Lorenzo Franchi2
1Department of Medical Biotechnologies, University of Siena, 53100 Siena, Italy.
Materials (Basel, Switzerland)
|February 15, 2022
Summary
Universal adhesives show promise for bracket bonding to polished lithium disilicate (LDS) and monolithic zirconia (MZ) ceramic surfaces. However, adhesion to glazed surfaces remains a clinical challenge for all tested adhesives.
Area of Science:
- Dental Materials Science
- Biomaterials Engineering
- Orthodontic Adhesion Technology
Background:
- Increasing use of ceramic restorations necessitates reliable bracket bonding methods.
- Lithium disilicate (LDS) and monolithic zirconia (MZ) are common ceramic materials in dental restorations.
- Evaluating universal adhesives for bracket adhesion to these surfaces is crucial for clinical success.
Purpose of the Study:
- To assess the efficacy of universal adhesives in bonding brackets to polished and glazed LDS and MZ.
- To compare the bracket bond strength (SBS) achieved with different universal adhesives and a control primer.
- To analyze failure types using the Modified Adhesive Remnant Index (ARI).
Main Methods:
- 120 brackets were bonded to polished/glazed LDS and MZ blocks using three adhesives: Scotchbond™ Universal Adhesive (SU), Assure Plus (AP), and Transbond™ XT Primer (XTP).
- Shear Bond Strength (SBS) was measured for each group.
- Failure modes were assessed using the Modified Adhesive Remnant Index (ARI).
Main Results:
- Scotchbond™ Universal Adhesive (SU) demonstrated significantly superior SBS on polished LDS compared to AP and XTP.
- Both SU and Assure Plus (AP) significantly improved bracket retention on polished MZ compared to XTP.
- All tested adhesives exhibited low SBS values on glazed LDS and MZ, falling below clinical acceptability thresholds.
Conclusions:
- Universal adhesives SU and AP show potential for bonding brackets to polished LDS and MZ surfaces.
- Current universal adhesives may not provide sufficient bond strength for bracket adhesion to glazed ceramic surfaces.
- Further research is needed to optimize adhesion to glazed ceramic restorations in orthodontics.
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