Effect of aging on microshearing bond strength of different adhesive systems

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Dağdelen Ahısha C., Üçtaşlı M. B.

BMC ORAL HEALTH, cilt.26, ss.1-9, 2026 (SCI-Expanded, Scopus)

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 26
  • Basım Tarihi: 2026
  • Doi Numarası: 10.1186/s12903-026-08010-5
  • Dergi Adı: BMC ORAL HEALTH
  • Derginin Tarandığı İndeksler: Scopus, Science Citation Index Expanded (SCI-EXPANDED), CINAHL, MEDLINE, Directory of Open Access Journals
  • Sayfa Sayıları: ss.1-9
  • Açık Arşiv Koleksiyonu: AVESİS Açık Erişim Koleksiyonu
  • Gazi Üniversitesi Adresli: Evet

Özet

Abstract

Background Reliable bonding agents are essential for durable tooth-colored restorations. This study aimed to

evaluate the effects of a two-step self-etch adhesive and a universal adhesive (used in self-etch and etch-and-rinse

modes) on dentin microshear bond strength and the impact of 1-year simulated thermal aging.

Methods In this study, 60 caries-free human incisors were used. A two-step self-etch adhesive system (SE) (Clearfil

SE Bond; Kuraray Noritake Dental, Japan), a universal adhesive in self-etch mode (U-SE) (Clearfil S3 Bond Universal;

Kuraray Noritake Dental, Japan), and the same universal adhesive in etch-and-rinse mode (U-ER) were tested. The

specimens were randomly divided into six groups (n = 10 per group): (1) SE, initial measurement without aging (T0);

(2) U-SE, initial measurement without aging (T0); (3) U-ER, initial measurement without aging (T0); (4) SE, after artificial

aging (T1); (5) U-SE, after artificial aging (T1); and (6) U-ER, after artificial aging (T1). Artificial aging was performed

by 10,000 thermal cycles between 5 °C and 55 °C, simulating approximately one year of intraoral conditions. The

prepared samples were evaluated using the microshear bond strength test. Non-parametric tests were applied for

statistical analysis due to the small sample size and non-normal data distribution, with significance set at p < 0.05.

Results The SE without aging group 1 (15.70 MPa) and SE aged group 4 (11.82 MPa) showed the highest bond

strength values, while the U-ER without aging group 3 and aged group 6 consistently presented the lowest (6.58

MPa, 6.33 MPa). After 1-year artificial aging, bond strength significantly decreased in the SE (p<0.05) and U-SE (p<0.05)

groups, whereas no significant change was observed in the U-ER group (p>0.05). Overall, statistical analysis confirmed

significant differences among the adhesive systems and aging conditions (p<0.05).

Conclusions According to the results of this study, when the micro shear bond strengths of dentin adhesive systems

were compared, it was found that the SE group showed higher bond strength values than the U-ER and U-SE groups

at the beginning and after 1-year aging simulation.

Keywords Adhesive systems, Bond Strenght, Thermal aging