Prisma Universal Bond Research Articles

Shear Bond Strength of Dicor Using Resin Adhesive Systems and Light Activated Cement

A laboratory study was conducted to determine the shear bond strength to dentin of etched and silane-treated Dicor castable ceramic glass using a resin cement and newer generation adhesive systems. Scanning electron microscopy (SEM) examinations were also completed to evaluate the failure sites. The mean shear bond strength of the control (resin cement only, no adhesive system) was 2.1 +/- 1.2 MPa. The shear bond strength values determined for the adhesive systems and resin cement are as follows: Prisma Universal Bond 2, 18.7 +/- 2.9; XR Primer/XR Bond, 16.9 +/- 6.4; Scotchbond 2, 15.8 +/- 6.2; Tenure Solution, 15.4 +/- 4.5; and Gluma, 14.8 +/- 5.5 MPa. SEM examinations of the debonded specimens attached with Prisma Universal Bond 2 and Tenure Solution showed a complex failure pattern with cohesive failure in the glass ceramic material and adhesive failure between the resin cement and the etched and silane-treated glass surface. The debonding pattern of specimens attached with XR Primer/XR Bond, Scotchbond 2 and Gluma were primarily adhesive between the dentin and resin materials. The results of this study support the use of an adhesive system in conjunction with a resin cement for placement of Dicor castable ceramic restorations.

Microleakage of Seven Dentin Bonding Agents

The purpose of this study was to evaluate the ability of seven dentin bonding agents to reduce dye penetration at the margins of microfill composite restorations in dentinal cavities. Forty extracted molars were selected and cleaned. Cavity preparations were made in dentin with #55 carbide burs. The preparations were restored with Silux after application of one of the following dentin bonding agents: Gluma, Scotchbond 2, Tenure, Prisma Universal Bond 2, Mirage-Bond, XR Bond, and All-Bond. Samples were thermocycled for 200 cycles between 3 degrees C and 60 degrees C, then immersed in a 0.05 percent crystal violet solution for 2 hours. The samples were embedded in clear casting resin, sectioned, and examined with a light microscope. Our results indicated that the dentin bonding systems reduced, but failed to totally eliminate, microleakage around the composite resin restorations.

Bond Strength, Microleakage, and Scanning Electron Microscopy Examination of the Prisma Universal Bond 2 Adhesive System

Dentin shear bond strength and marginal microleakage of a new primer/adhesive system were evaluated in this study and compared to Tenure Solution, Gluma, XR Primer/XR Bond, and Scotchbond 2. In addition, scanning electron microscopy examinations were conducted to evaluate the effect of the new primer on the smear layer, determine the film thickness of the primer/adhesive, and examine the resindentin interface of restorations placed with the new system.

Evaluation of potassium oxalate as a cavity liner

All dental restoratives exhibit some microleakage. Recent studies disclosed that oxalate salts were superior to Copalite varnish in reducing dentinal permeability, but inferior in reducing microleakage. This study compared the effectiveness of a potassium oxalate solution (DDS) with three other cavity liners (Copalite, Cavi-Line, Prisma Universal Bond) and a no-liner control in reducing microleakage under amalgam restorations. Under the conditions of this study, DDS solution was significantly effective in reducing microleakage under amalgam restorations.

31P-NMR study of P-based dental adhesives and electron probe microanalysis of simulated interfaces with dentin

The structure and function of P in P-based dental adhesives have not been defined properly. The purpose of this study was to evaluate these parameters in some currently available materials. Five dental adhesives were selected: Bondlite, Clearfil New Bond, J&J Dental Adhesive, Prisma Universal Bond, and Scotchbond. High-resolution 31P-NMR spectroscopy was used to identify the phases of the incorporated P and the kinetics of monomer-bonded P in an aqueous environment. Areas of 5 mm diameter located on polished sound dentin were subjected to the corresponding adhesive treatments and covered with translucent molds of the same diameter, which were filled up to 1 mm length with visible-light-cured hybrid composite. Following 60 sec of light exposure from lateral directions, the specimens were embedded in fast-setting resin, cross-sectioned, and analyzed in an electron probe microanalyzer. The elemental profiles of Ca, P, and Cl were determined from area and line scans. Great differences in the 31P resonance shifts were obtained from the tested adhesives, indicating the presence of monomer-bonded and free P. A rapid hydrolysis of the resin-bonded P in the presence of water was identified. The x-ray images revealed dentin demineralization, with distinct differences in the P distribution pattern and the P/Cl ratio.

Marginal gap formation in the composite resin/glass ionomer cement Class V restoration

The purpose of this study was to assess marginal gap formation in Class V restorations using 2 dentin bonding agents (DBA) and 7 different cavity filling methods. Two glass ionomer cements (GIC) were used: Ketac-Bond (KB) and Ketac-Fil (KF). Class V cavities were prepared, one-half in enamel and one-half in dentin, in extracted human teeth. There were 2 control (no GIC used) and 12 experimental groups with 10 restortions each. Seven groups were evaluated with Scotchbond Lightcure (S) and 7 with Prisma Universal Bond (P). For each DBA the KB was applied as a 0.5 mm layer in 2 of the groups. In one of these the cement was etched with 35% H 3PO 4 for 30 s. For each DBA the KF was applied either in bulk, leaving the margins exposed (2 groups), or the cavities were filled, and then cut back after 24 h, exposing the margins (2 groups). The KF was etched in 2 of these 4 groups with 35% H 3PO 4 for 30 s. In all cases the enamel was beveled and etched. All cavities were filled with Silux. Basic fuchsin dye was used to detect marginal gaps. Each restoration was photographed, traced, and scored for marginal gaps as 0 or 1 at 5 enamel and 5 dentin locations. Gaps were present in 6.6% of all enamel locations and in 92% of all dentin locations. The effect of methods and DBA on marginal leakage at the enamel and dentin locations was assessed by two-way analysis of variance. There were significant differences between methods for enamel (p<0.01) and for dentin (p<0.005). The leakage scores for S were significantly greater than P in enamel (p<0.005) and in dentin (p<0.025). Although there were statistically significant differences among methods and between DBA, these differences are considered to be of little or no clinical significance because there were so few enamel marginal gaps while dentin marginal gaps were present in almost all the cases.