The concept of minimally invasive therapy was largely based on the appearance of biomimetic materials that have the capacity to reproduce one or several natural phenomena in the context of their functioning in the oral biologic system. With the purpose of obtaining an ideal
adhesion both in the enamel but especially in the dentin, we introduced the self-etching systems in one of the 2 steps of application. The cervical restorations have the particularity of presenting the walls constituted of enamel or dentin, tissues that behave differently in the presence of modern adhesive systems. The objectives of the present study are represented by: the evaluation of the marginal sealing at the level of coronary enamel and dentin or gingival cement within the same technique (total etching in 3 steps, self-etching in 2 steps and self-etching in one step), the comparisons of the results between the 3 techniques; and the assessment whether the application of a separate stage of conditioning with phosphoric acid specific to the total conditioning technique within the self-etching technique, would improve the results.
Material and method: we used 20 premolars extracted for orthodontic reasons with which we formed 5 groups of study according to the technique for obtaining adhesion. The samples were stocked in the colorant after they had been sectioned and we measured the distance of colorant microleakage with the help of an optic microscope X20. The results were statistically processed with the help of Tukey multiple comparison test. Results and conclusions: the values obtained have proven that the separate acid etching technique has obtained ideal values of the sealing at the level of the enamel, that the self-etching techniques ensure a less efficient adhesion even at the dentin level and that the introduction of a supplementary etching stage significantly improves the adhesion values.
- composite resins
- DENTIN ADHESION
- SELF-ETCHING ACID PRIMERS
- SEPARATE ACID ETCHING