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Zinc oxide eugenol paste jeopardises the adhesive bonding to primary dentine
C W Pires1, T L Lenzi2, F Z M Soares3
1University Center of Serra Gaúcha, Caxias do Sul, RS, Brazil. cwpodonto@gmail.com.
Summary
Zinc oxide eugenol paste significantly reduced the bond strength of dental adhesives to primary dentine. However, iodoform-based and calcium hydroxide pastes did not impact microshear bond strength, showing promising results for these materials.
Area of Science:
- Dental Materials Science
- Adhesive Dentistry
- Pediatric Dentistry
Background:
- Primary dentition requires effective restorative materials.
- Understanding the interaction between root canal filling pastes and adhesive systems is crucial for long-term clinical success.
- Microshear bond strength (µSBS) is a key indicator of adhesive performance.
Purpose of the Study:
- To evaluate the effect of different root canal filling pastes on the microshear bond strength of an adhesive system to primary dentine.
- To compare the µSBS values when using zinc oxide eugenol (ZOE) paste, iodoform paste, calcium hydroxide paste, and no filling paste as controls.
Main Methods:
- Thirty-two human primary molars were divided into four groups.
- Pastes (ZOE, iodoform, Ca(OH)2-ZnO) were applied to dentine surfaces for 15 minutes.
- After paste removal, adhesive and composite resin were applied, followed by µSBS testing after 24-hour water storage.
Main Results:
- Zinc oxide eugenol (ZOE) paste resulted in the lowest µSBS values.
- No significant difference in µSBS was observed for iodoform paste or calcium hydroxide paste compared to the control group.
- All tested specimens exhibited adhesive or mixed failure modes.
Conclusions:
- Zinc oxide eugenol (ZOE) paste adversely affects the bond strength of adhesive systems to primary dentine.
- Iodoform-based Guedes-Pinto paste and calcium hydroxide paste thickened with zinc oxide do not negatively impact microshear bond strength.
- These findings suggest that ZOE paste should be used with caution in conjunction with adhesive restorations in primary teeth.
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