Bond strength and micro morphologyof a self-etching primer versus a standard adhesive system with varyingetching times in primary teeth

Authors:

ABSTRACT

Aim

These were to firstly evaluate the shear bond strength of a composite resin to primary dental enamel treated with a standard adhesive system but with varying phosphoric acid etching times along with a self-etching prime, secondly to analyse the etching patterns using SEM.

Methods

STATISTICS: Data were analysed using one way ANOVA, followed by Scheff, test to determine differences between groups.

Material and methods

Forty primary molars were used. In the first three groups, following acid etching, a layer of Prime & Bond NT adhesive was employed, and in group 4 the self-etching adhesive system (Prompt-L-Pop) was used. A composite cylinder (Spectrum, Denstply, Germany) was then applied. After processing of the samples, the teeth were subjected to shear stress using an Instrom universal machine. The study of primary enamel morphology after etching for different time periods and using different etching systems was carried out with a scanning electron microscope.

Results

In the groups subjected to acid etching for 5 and 15 seconds significant differences were recorded versus the self-etching group (p<0.0001). Regarding the SEM study of primary enamel morphology, there was predominately a clear and marked type 2 etching pattern.

Conclusion

In the groups subjected to acid etching for 5 and 15 seconds significant differences were recorded versus the self-etching group (p<0.0001). Regarding the SEM study of primary enamel morphology, there was predominately a clear and marked type 2 etching pattern. CONCLUSIONS: Longer acid etching times for primary enamel do not appear necessary, as 15 seconds suffice to obtain retentive etching patterns, and the bonding strengths obtained with the traditional etching technique followed by two-step adhesive application are sufficient to ensure good composite resin bonding to the enamel surface. However, the self-etching adhesive system employed yields less than optimum bonding strength to primary enamel surfaces.

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