Is an oxygen inhibition layer essential for the interfacial bonding between resin composite layers?

Article information

Restor Dent Endod. 2008;33(4):405-412

Publication date (electronic) : 2008 July 31

doi : https://doi.org/10.5395/JKACD.2008.33.4.405

Sun-Young Kim , Byeong-Hoon Cho , Seung-Ho Baek , In-Bog Lee

Department of Conservative Dentistry, School of Dentistry, Seoul National University, Korea.

Corresponding Author: In-Bog Lee. Department of Conservative Dentistry, School of Dentistry, Seoul National University, 275-1 Yeongeon-Dong, Jongno-Gu, Seoul, 110-768, Korea. Tel: 82-2-2072-3953, Fax: 82-2-2072-3859, inboglee@snu.ac.kr

Received 2008 June 04; Revised 2008 July 04; Accepted 2008 July 08.

Abstract

This study was aimed to investigate whether an oxygen inhibition layer (OIL) is essential for the interfacial bonding between resin composite layers or not.

A composite (Z-250, 3M ESPE) was filled in two layers using two aluminum plate molds with a hole of 3.7 mm diameter. The surface of first layer of cured composite was prepared by one of five methods as followings, thereafter second layer of composite was filled and cured: Group 1 - OIL is allowed to remain on the surface of cured composite; Group 2 - OIL was removed by rubbing with acetone-soaked cotton; Group 3 - formation of the OIL was inhibited using a Mylar strip; Group 4 - OIL was covered with glycerin and light-cured; Group 5 (control) - composite was bulk-filled in a layer. The interfacial shear bond strength between two layers was tested and the fracture modes were observed. To investigate the propagation of polymerization reaction from active area having a photo-initiator to inactive area without the initiator, a flowable composite (Aelite Flow) or an adhesive resin (Adhesive of ScotchBond Multipurpose) was placed over an experimental composite (Exp_Com) which does not include a photoinitiator and light-cured. After sectioning the specimen, the cured thickness of the Exp_Com was measured.

The bond strength of group 2, 3 and 4 did not show statistically significant difference with group 1. Groups 3 and 4 were not statistically significant different with control group 5. The cured thicknesses of Exp_Com under the flowable resin and adhesive resin were 20.95 (0.90) um and 42.13 (2.09), respectively.

Keywords: Oxygen inhibition layer; Interfacial bonding; Resin composite; Flowable composite; Adhesive resin; Cured thickness

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This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Figure 1

Arrangements of two molds for testing the interfacial shear bond strength. A: aluminum mold, B: hole for composite (diameter = 3.7 mm), C: hole for mounting jig connecting to an universal testing machine.

Figure 2

Specimen preparations for measuring the thickness of the interfacial polymerization propagation.

Figure 3

Interfacial shear bond strength between two resin composite layers according to the interfacial treatments. Group 1: remained oxygen inhibition layer at the interface, Group 2: removed oxygen inhibition layer with acetone, Group 3: inhibited the formation of oxygen inhibition layer by Mylar strip, Group 4: OIL was covered with glycerin and light-cured, Group 5: control group of bulk-filled composite. Groups within same bar did not show statistically significant differences.

Figure 4

Distribution of the interfacial fracture modes according to the interfacial treatments (n = 20).

Figure 5

(a) Cured layer of Exp_Com by the propagation of the polymerization reaction induced from Aelite Flow, or (b) from Adhesive resin of ScotchBond Multipurpose, (c) cured layer thickness of Exp_Com according to the interfacing resins. (AF, Aelite Flow; AR, Adhesive resin of ScotchBond Multipurpose.)