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Effect of CPP-ACP application on flexural strength of bleached enamel and dentin complex
M Khoroushi1, H Mazaheri, Ae Manoochehri
1Department of Operative Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran. Khoroushi@dnt.mui.ac.ir
Operative Dentistry
|August 13, 2011
Summary
Applying casein phosphopeptide-amorphous calcium phosphate (CPP-ACP) after bleaching treatments can restore the flexural strength (FS) of bovine teeth. This finding is crucial for understanding how to protect tooth structure from potential damage caused by bleaching agents.
Area of Science:
- Dental Materials Science
- Biomaterials Research
- Tooth Bleaching Efficacy
Background:
- Dental bleaching procedures can negatively impact tooth mechanical properties, including flexural strength (FS).
- Existing literature presents conflicting findings regarding the effects of bleaching on dental hard tissues.
- Investigating protective agents is essential for mitigating adverse bleaching outcomes.
Purpose of the Study:
- To evaluate the impact of casein phosphopeptide-amorphous calcium phosphate (CPP-ACP) on the flexural strength (FS) of bleached bovine teeth.
- To compare the effects of different hydrogen peroxide (HP) concentrations and CPP-ACP application on tooth FS.
- To determine if CPP-ACP can counteract the reduction in FS caused by bleaching treatments.
Main Methods:
- Bovine tooth enamel-dentin blocks were subjected to various bleaching protocols (9.5% HP, 38% HP) with or without CPP-ACP application.
- Control groups received no bleaching or only CPP-ACP treatment.
- Flexural strength was measured using a universal testing machine following established ISO standards.
Main Results:
- Bleaching treatments, particularly with 38% HP, significantly reduced the flexural strength of bovine teeth compared to the control group.
- Application of CPP-ACP subsequent to both 9.5% and 38% HP bleaching regimens demonstrated a significant positive effect on restoring tooth flexural strength.
- The study observed statistically significant differences in FS values across the experimental groups (p<0.05).
Conclusions:
- Simulated in-office and at-home bleaching regimens, when performed without saliva, can decrease the flexural strength of tooth structure.
- Post-bleaching application of CPP-ACP can effectively compensate for the reduction in flexural strength of the bovine enamel-dentin complex.
- These findings suggest CPP-ACP as a potential protective agent against bleaching-induced mechanical property degradation in teeth.
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