Effect of increasing application time of single bottle adhesives to microtensile bond strength of dried dentin

Article information

Restor Dent Endod. 2005;30(6):435-441

Publication date (electronic) : 2005 November 30

doi : https://doi.org/10.5395/JKACD.2005.30.6.435

Hak-Geun Kim , Dong-Jun Kim , Yun-Chan Hwang , Wonmann Oh , In-Nam Hwang

Department of Conservative Dentistry, College of Dentistry, Chonnam National University, Korea.

Corresponding author: In-Nam Hwang. Department of Conservative Dentistry, College of Dentistry, Chonnam National University, 8 Hak-dong, Dong-gu, Gwangju, South Korea, 501-757. Tel: 82-62-220-4443, Fax: 82-62-225-8387, hinso@jnu.ac.kr

Received 2005 May 16; Revised 2005 July 12; Accepted 2005 August 26.

Abstract

The purpose of this study was to evaluate the effect of increasing application time of single bottle adhesives (SBA) to microtensile bond strength (MTBS) of dried dentin. To expose the superficial dentin surfaces, human molars were sectioned perpendicular to the long axis of tooth. 32% phosphoric acid gels were applied for 15s and rinsed. The teeth were randomly assigned to 3 groups ; S group (Single Bond), O group (One-Step), P group (Prime & Bond NT). Each group was divided to 3 subgroups (W: dentin wipe with wet gauge and light cured immediately, D: dentin dried for 30s and light cured immediately, 30: dentin dried for 30s and light cured after applying SBA for 30s). Composite resin was built up on the dentin surface and sectioned to obtain 20 specimens with 1 mm² cross sectional area and the MTBS was measured.

For Single Bond, the mean MTBS of S-W and S-30 group were higher than that of S-D group statistically (P < 0.05). For One-Step, the mean MTBS of O-D group was statistically lower than that of O-W group (P < 0.05). For Prime & Bond NT, the mean MTBS of P-30 group was statistically lower than that of P-D group (P < 0.05).

Keywords: Microtensile bond strength; Dried dentin; Application time; Single Bond; One-Step; Prime & Bond NT

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Figure 1

Microtensile bond strength (_MPa) of each group.

Table 1

Adhesive systems used in this study

Bis-GMA = bis-phenol-A-diglycidyl methacrylate,

HEMA = 2-hydroxyethyl methacrylate,

BPDM = biphenyl dimethacrylate,

PENTA = dipentaerythritol pentacrylate phosphorous acid ester,

UDMA = urethane dimethacrylate.

Table 2

Microtensile bond strength (_MPa) of each group

Superscripts of the same letter indicate values of no statistical significant difference (p > 0.05).