Dentin Bonding With and Without Micro-abrasion for Immediate Dentin Sealing

Objectives: Immediate dentin sealing (IDS) has been shown to increase bond strength of indirect restorations to tooth structure. This study was conducted to compare shear bond strengths (SBS) of composite resin cement to dentin using two different bonding protocols for IDS.

Methods: Thirty extracted human molars were obtained and divided into two groups. A fourth-generation dental bonding adhesive (DBA) was used in group one and a sixth-generation DBA was used in group two.  A coat of temporary cement was applied to each sample after the immediate dentin sealing protocol proposed by Pascal Magne.  After storage for 1 week in a 100% humidity, each tooth was divided into two halves, and the temporary cement removed from one half using fine pumice with a prophy brush, the other half with micro-airborne particle abrasion (MAPA).  Flowable composite was bonded to sample surfaces using a layer of adhesive resin respective to their group and an Ultradent SBS tester molds.   SBS testing was performed with the Ultratester after 24 hour storage in 100% humidity.  SBS data obtained was analyzed using two factor repeated measures ANOVA.

Results: No statistically significant difference was found between the teeth cleaned with pumice and those cleaned with MAPA.  When comparing the mean SBS of fourth and sixth-generation DBA’s with and without MAPA the fourth-generation DBA had a higher mean SBS with MAPA (27.69 MPa) than without (24.31 MPa). Conversely, sixth-generation DBA had a higher mean SBS without MAPA (30.08 MPa), than with MAPA (26.14 MPa).

Conclusions: When preparing teeth for bonded indirect restorations, IDS treated teeth with either  fourth-generation DBA temporized and cleaned with MAPA or sixth-generation DBA, temporized and cleaned with pumice showed no statistical significant difference in SBS.  According to the parameters of this study, either protocol can be used for IDS with satisfactory bond strengths.