MDP is effective for removing residual polycarboxylate temporary cement as an adhesion inhibitor

Abstract

The effect of cleaner containing 10-methacryloyloxydecyl dihydrogen phosphate (MDP) for removing temporary cement remnants on dentin surface was evaluated. Flat dentin surfaces were wet-polished (Co) and HY-BOND temporary cement hard (Shofu) was applied to the surface. This temporary cement was removed using an air-scaler (Sc), brush (Br), or phosphoric acid and NaOCl (NC). A prototype cleaner containing MDP (Kuraray Noritake Dental, Tokyo, Japan) was used with agitation mode (MC+AG). KATANA Avencia block (Kuraray Noritake Dental) was luted with SA Cement Plus Automix (Kuraray Noritake Dental). Co showed significantly higher bond strength than Sc or Br (p<0.001 each). Bond strengths with NC (p=0.99) and MC+AG (p=0.38) did not differ significantly from that with Co. Transmission electron microscopy revealed sufficient interaction of MC+AG. Cleaner containing MDP can effectively remove temporary cement by agitation, and can be expected to improve the chemical bonding ability by binding more MDP to dentin.

Effect of a temporary sealing material on the bond strength of CAD/CAM inlay restorations with resin-coating technique

“…As for the groups without cleaning and cleaned with RB after 1 week, MTBS were lower than those of the other groups, and the predominant failure mode was "cem-cr". It has been reported that a rotational brush is an effective method to clean the dentin surface prior to restoration cementation procedure 8,10,11) . In addition, cleaning with a rotational brush is a simple and widely used method in clinical practice 8,10) .…”

“…The present study was conducted simulating inlay restorations and a hydraulic temporary sealing material was used. The previous studies were conducted simulating crown restorations and non-eugenol zinc-oxide cement 10) or a polycarboxylate cement 11) was used. The difference of used materials might cause different results after cleaning with a rotational brush.…”

“…The study which investigated the effect of MDP containing cleaner revealed that the structure of MDP was expected to have a strong surfactant effect 11) . MDP has a structure with both hydrophilic and hydrophobic groups 19) .…”

“…MDP has a structure with both hydrophilic and hydrophobic groups 19) . Thus MDP binds to the surface of two substances with different polarities at the end of the hydrophobic 11) . Consequently, the temporary cement is easily separated from the adhered surface 11) .…”

“…An adequate removal of temporary sealing material from the prepared cavity is important in order to acquire good bonding performance of final restoration. Several researches have conducted to evaluate the removal methods of temporary sealing material [8][9][10][11] . Recently, newly developed universal cleaner which contains 10-methacryloyloxydecyl dihydrogen phosphate (MDP) was launched on the market.…”