Influence of electron beam irradiation on the alloy‐to‐resin bond strength

Abstract

The aim of this study was to investigate whether postcuring using electron beam irradiation had an effect on the bond strength of resin-to-base-metal after priming their surfaces using silicoating methods or functional monomers. Composite cylinders were bonded on a restricted area of 5 mm2 to flat rectangular titanium and cobalt-chromium specimens. Under investigation were the silicoating system Rocatec, the thiol-phosphate system Metal Primer II and the phosphate ester SR Link. Tensile strength and shear bond strength were determined for the three test groups in each case: (i) after 24 h, (ii) after electron beam irradiation (100 kGy), and (iii) after irradiation (100 kGy) + 12,000 cycles of thermal cycling (5 degrees /55 degrees C). The bond strength was highly affected by irradiation and the metal priming method used. However, the tribochemical silicoating method and phosphate-ester group showed no significant statistical change in bond strength. Only the thiol-phosphate system showed considerably higher tensile and shear bond strengths after irradiation. Thermal cycling did not deteriorate this bond and there was a tendency for higher bond strength on titanium. As a result it was determined that thiol-phosphate primers in combination with postcuring using electron beam irradiation can considerably improve the bond strength between resins and titanium or cobalt-chromium alloys.

Effect of Electron Beam Irradiation on Flexural Strength of Two Nanocomposites-an In vitro Study

“…Even though the mechanism of cross linking polymers by irradiation which involves the splitting-off of a hydrogen atom from a C-H bond has been extensively studied, the exact mechanism is still unknown. In contrast, chain breakage or chain scission can also occur [9][10][11].…”

Electron Beam Irradiation of Resin Luting Agents - a Cytotoxic Evaluation on Dental Pulp Cells

“…Investigations of Charlesby and Ross showed that electron beam irradiation can be used for improving the properties of polymers [22]. In general, electron beam irradiation of polymers can give rise to two type of reactions: cross linking, chain breakage [23,24].…”

Composite Resin-to-Metal Shear Bond Strengths Using Six Intra-oral Repair Systems

“…There is an agreement about the necessity of sufficient bonding to various cast alloys, e.g., to fix the newly fabricated veneer to the remaining crown base, to bond brackets onto existing metal crowns of adult patients, or to splint teeth with existing metal crowns for periodontal reasons [6,[8][9][10]. Furthermore, the dentist might not be able to ascertain the type of alloy of a previously inserted restoration, as ceramometal crowns can be fabricated using noble or base metal alloys [5,9,[11][12][13][14][15].…”

“…Silanization is a well-known method to improve bond strength of composite resin to metal alloy by a certain silane (e.g., methacryloxypropyltrimethoxysilane, MPTS) [2,6]. Primer systems use functional monomers (bifunctional molecules), such as methacrylate-thiophosphoric acid [11,12,[21][22][23][24]. The bifunctional molecules of the silane and the primer react with the oxide film of the metal alloys as well as with the opaquer or the composite resin and reduce the tendency for hydrolysis [21][22][23][24]28].…”