SEALING ABILITY OF 2 COMPOMERS APPLIED WITH AND WITHOUT PHOSPHORIC-ACID TREATMENT FOR CLASS-V RESTORATIONS IN-VIVO

Statement of problem. ''Compomers'' are bring used with increasing fre quency in Europe and North America. Purpose. This study evaluated the marginal seal of two compomers in vivo. Material and methods. Periodon tally involved teeth, scheduled for extraction, were selected. Four gr oups of a combination of materials were used (Dyract with Dyract-PSA p rimer, group 1; Dyract with prime and Bond 2.0, group 2; Compoglass wi th SCA primer, group 3; and Compoglass with Syntac Single Component, g roup 4). The restorations were made in a standardized shaped cavity: a cross the cementoenamel junction, and the teeth were extracted after 2 to 3 months of clinical service. The specimens were kept in a solutio n of 2% methylene blue for 24 hours. After being embedded in epoxy res in, sections were made with a low speed saw along the longitudinal axi s of the teeth. The examination of dye penetration was made with a mic roscope at a magnification of x20 and scoring was done at both coronal and apical sites. Kruskal-Wallis statistical analysis was performed a t 5% significance level. Results. Groups 2 and 4 scored significantly less than groups 1 and 3 and for groups 2 and 4, 30% of the restoratio ns exhibited leakage. Conclusion. These restoration systems did not co mpletely prevent leakage either at the incisal or the cervical margins . Therefore the use of an enamel-dentin bonding system in combination with the proprietary compomer is recommended.