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Influence of different etching times on dentin surface morphology
Davor Brajdić1, Ozren Mika Krznarić, Zoran Azinović
1Department of Oral and Maxillofacial Surgery, University Hospital "Dubrava", School of Dental Medicine, University of Zagreb, Croatia. dabrajdic@net.hr
Collegium Antropologicum
|November 6, 2008
Summary
Longer etching times, specifically 30 seconds, significantly alter demineralized dentin surface morphology. Increased tubule number and diameter, along with changes in surface porosity, negatively impact dentin hybridization.
Area of Science:
- Dental Materials Science
- Surface Chemistry
- Biomaterials
Background:
- Dentin etching is crucial for dental adhesive procedures.
- Optimizing etching time is essential for predictable bond strengths.
- Understanding surface morphology changes is key to improving dental restorations.
Purpose of the Study:
- To investigate the impact of varying phosphoric acid etching times on demineralized dentin surface morphology.
- To analyze changes in dentinal tubule characteristics and surface porosity.
- To evaluate the effect of etching duration on the peritubular dentin cuff.
Main Methods:
- Scanning electron microscopy (SEM) was used to examine dentin surface morphology.
- Qualitative line microanalysis assessed chemical structure.
- Two etching times (10 and 30 seconds) with 37% phosphoric acid were compared.
- Quantitative and qualitative statistical analyses (Kolmogorov-Smirnov, Student t-test, chi2-test) were performed.
Main Results:
- A 30-second etching time significantly increased dentinal tubule number and diameter (p < 0.05).
- Increased etching time led to a higher dentinal tubule surface percentage (p < 0.001) and decreased intertubular surface percentage (p < 0.001).
- Prolonged etching resulted in a porous surface zone and complete dissolution of the peritubular dentin cuff (p < 0.001).
Conclusions:
- Etching time significantly influences demineralized dentin surface morphology.
- Longer etching times induce more pronounced morphological changes.
- These alterations may negatively affect the dentin hybridization process and subsequent adhesive bond durability.
