Influence of intrapulpal pressure simulation on the bond strength of adhesive systems to dentin

Abstract

The purpose of this study was to evaluate the influence of intrapulpal pressure simulation on the bonding effectiveness of etch & rinse and self-etch adhesives to dentin. Eighty sound human molars were distributed into eight groups, according to the permeability level of each sample, measured by an apparatus to assess hydraulic conductance (Lp). Thus, a similar mean permeability was achieved in each group. Three etch & rinse adhesives (Prime & Bond NT - PB, Single Bond -SB, and Excite--EX) and one self-etch system (Clearfil SE Bond--SE) were employed, varying the presence or absence of an intrapulpal pressure (IPP) simulation of 15 cmH2O. After adhesive and restorative procedures were carried out, the samples were stored in distilled water for 24 hours at 37 degrees C, and taken for tensile bond strength (TBS) testing. Fracture analysis was performed using a light microscope at 40 X magnification. The data, obtained in MPa, were then submitted to the Kruskal-Wallis test ( a = 0.05). The results revealed that the TBS of SB and EX was significantly reduced under IPP simulation, differing from the TBS of PB and SE. Moreover, SE obtained the highest bond strength values in the presence of IPP. It could be concluded that IPP simulation can influence the bond strength of certain adhesive systems to dentin and should be considered when in vitro studies are conducted.

Evaluation of tooth‐fragment reattachment: a clinical and laboratory study

“…The dentin bonding agent that was used in this study, namely Prime Bond & NT™ is an acetone‐based resin. Hence, we suggest that the water‐chasing ability of acetone effectively displaced water from the dentin surface, resulting in optimal resin infiltration into the collagen network (30). In addition, the bonding agent contains nano‐sized filler particles.…”

Current aspects on bonding effectiveness and stability in adhesive dentistry

“…In addition, dentine is intimately connected with pulpal tissue by means of numerous fluid‐filled tubules, which traverse through dentine from the pulp to the dentino‐enamel junction. Once under constant outward pressure, this fluid renders the exposed dentine surface naturally moist and thus intrinsically hydrophilic 15,16 . This hydrophilicity definitely represents one of the major challenges for the interaction of modern adhesives with dentine.…”

Characterization of Dentine to Assess Bond Strength of Dental Composites

“…Human teeth, however, are difficult to obtain. Other problems include their small size, variability with age and disease level [9,10,11], infection hazard [12], and ethical issues [13]. Bovine teeth on the other hand are easy to obtain, but have same drawbacks like human teeth, which includes small size, variability, and cross infection.…”