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Can Cleansing Regimens Effectively Eliminate Saliva Contamination from Lithium Disilicate Ceramic Surface?
Alexandre L S Borges1, Sumana Posritong2, Mutlu Özcan3
1Associate Professor, University of Estadual Paulista (UNESP), Institute of Science and Technology, São José dos Campos Dental School, Department of Dental Materials and Prosthodontics, São José dos Campos, Brazil.
Mechanical cleaning protocols effectively restore resin cement bond strength to saliva-contaminated glass-ceramics. Protocols using phosphoric acid or Ivoclean cleaning paste were most successful, comparable to uncontaminated controls.
Area of Science:
- Materials Science
- Biomaterials Science
- Dental Materials
Background:
- Saliva contamination of etched ceramic surfaces can compromise resin cement bond strength.
- Effective cleaning protocols are crucial for reliable adhesion in dental restorations.
Purpose of the Study:
- To evaluate the efficacy of different cleaning protocols in restoring the bond strength of resin cement to saliva-contaminated glass-ceramic.
- To compare the bond strength after various cleaning methods under dry and thermocycled conditions.
Main Methods:
- 120 glass-ceramic specimens were etched and contaminated with saliva.
- Specimens were cleaned using water, 37% phosphoric acid (PA), Ivoclean (IV), or isopropanol (IS).
- Bond strength was tested after 24h (dry) or 5000 thermocycles (aged).
Main Results:
- Both cleaning method and storage conditions significantly affected bond strength.
- PA and IV groups showed bond strength similar to the uncontaminated control in dry conditions.
- Thermocycling significantly reduced bond strength in all groups except IV.
Conclusions:
- Mechanical cleaning, particularly with phosphoric acid or Ivoclean, can effectively restore bond strength to saliva-contaminated glass-ceramics.
- Thermocycling negatively impacts bond strength, though Ivoclean showed some resilience.
- SEM revealed zirconia particles on IV-cleaned surfaces, suggesting a potential mechanism for improved adhesion.
