Morphological patterns of self-etching primers and self-etching adhesive bonded to tooth structure

Young-Gon Cho; Seok-Jong Lee; Jin-Ho Jeong; Young-Gon Lee; Soo-Mee Kim

doi:10.5395/JKACD.2003.28.1.023

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Cho, Lee, Jeong, Lee, and Kim: Morphological patterns of self-etching primers and self-etching adhesive bonded to tooth structure

Original Article

Journal of Korean Academy of Conservative Dentistry

Journal of Korean Academy of Conservative Dentistry 2003; 28(1): 23-33.

Published online: 31 January 2003

DOI: https://doi.org/10.5395/JKACD.2003.28.1.023

Morphological patterns of self-etching primers and self-etching adhesive bonded to tooth structure

Young-Gon Cho, Seok-Jong Lee, Jin-Ho Jeong, Young-Gon Lee, Soo-Mee Kim

Department of Conservative Dentistry, College of Dentistry, Chosun University, Korea.

Corresponding author (ygcho@mail.chosun.ac.kr)

(open-access):

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.

Abstract

The purpose of this study was to compare in vitro interfacial relationship of restorations bonded with three self-etching primer adhesives and one self-etching adhesive.

Class I cavity preparations were prepared on twenty extracted human molars. Prepared teeth were divided into four groups and restored with four adhesives and composites: Clearfil SE Bond/Clearfil™ AP-X (SE), UniFil Bond/UniFil® F (UF), FL Bond/Filtek™ Z 250 (FL) and Prompt L-Pop/Filtek™ Z 250 (LP)

After storing in distilled water of room temperature for 24 hours, the specimens were vertically sectioned and decalcified. Morphological patterns between the enamel/dentin and adhesives were observed under SEM.

The results of this study were as follows;

1. They showed close adaptation between enamel and SE, UF and FL except for LP.

2. The hybrid layer in dentin was 2 µm thick in SE, 1.5 µm thick in UF, and 0.4 µm in both FL and LP. So, the hybrid layers of SE and UF were slightly thicker than that of FL and LP.

3. The lengths and diameters of resin tags in UF and FL were similar, but those of LP were slightly shorter and slenderer than those of SE.

4. The resin tags were long rod shape in SE, and funnel shape in other groups.

Within the limitations of this study, it was concluded that self-etching primer adhesives showed close adaptation on enamel. In addition, the thickness of hybrid layer ranged from 0.4-1.5 µm between adhesives and dentin. The resin tags were long rod or funnel shape, and dimension of them was similar or different among adhesives.

Keywords: Morphological patterns, Self-etching primer adhesive, Self-etching adhesive, SEM, Hybrid layer, Resin tags

Figures and Tables

Fig. 1

Enamel (E)-Clearfil SE Bond (SE) interface showed close adaptation. (SEM×1,500)

Fig. 2

Clearfil SE Bond showing 2 µm thick hybrid layer (h) with numerous resin tags (t). (SEM×1,500)

Fig. 3

Higher magnification of Clearfil SE Bond showing long rod shaped resin tags (5-15 µm long). Diameter of resin tags was 2.3 µm thick at the base and 1.3 µm thick at the end. (SEM×3,500)

Fig. 4

Enamel (E)-UniFil Bond (UF) interface showed close adaptation and thick adhesive layer (a) between resin (R) and UF. (SEM×1,500)

Fig. 5

UniFil Bond (UF) showing 1.5 µm thick hybrid layer (h) with few resin tags(t). (SEM×1,500)

Fig. 6

Higher magnification of UniFil Bond (UF) showing long funnel shaped resin tags (3-12 µm long). Diameter of resin tags was 3 µm thick at the base and 1 µm thick at the end. (SEM×3,500)

Fig. 7

Enamel (E)-FL Bond (FL) interface showed close adaptation. (SEM×1,500)

Fig. 8

FL Bond showing 0.4 µm thick hybrid layer (h) with numerous resin tags(t). (SEM×1,500)

Fig. 9

Higher magnification of FL Bond showing long funnel shaped resin tags (2-12 µm long). Diameter of resin tags was 3 µm thick at the base and 1 µm thick at the end. (SEM×3,500)

Fig. 10

Enamel (E)-Prompt L-Pop (LP) interface showed close adaptation and thick adhesive layer (a) between resin (R) and LP. (SEM×1,500)

Fig. 11

Prompt L-Pop showing 0.4 µm thick hybrid layer with numerous resin tags (t). (SEM×1,500)

Fig. 12

Higher magnification of Prompt L-Pop showing short funnel shaped resin tags (4-8 µm long). Diameter of resin tags was 2.4 µm thick at the base and 0.6 µm thick at the end. (SEM×3,500)

Table 1

Group classification of three self-etching primer adhesives and one self-etching adhesive

Table 2

Chemical formulations of four adhesive systems

MDP: 10-methacryloyloxydecyl dihydrogen phosphate,

HEMA: 2-hydroxyethylmethacylate, 4-MET: 4-methacryethyl trimettalic acid,

MFM: multi-functional methacrylate, 4-AET:4-acryloxyethyltrimellitic acid,

4-AETA: 4-acryloxyethyltrimellitate anhydride

Table 3

Hybrid layer thickness (HLT), resin tags length (RTL), resin tags diameter (RTD) and resin tags shape (RTS) of the tested adhesives

^*B: Base diameter of resin tags, E: End diameter of resin tags

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