Effect of contamination on the bond strength to dentin

Bedir F., Karadaş M., Dinç H. N.

FDI World Dental Congress, İstanbul, Türkiye, 12 - 15 Eylül 2024, cilt.74, sa.206539, ss.132

  • Yayın Türü: Bildiri / Özet Bildiri
  • Cilt numarası: 74
  • Doi Numarası: 10.1016/j.identj.2024.07.975
  • Basıldığı Şehir: İstanbul
  • Basıldığı Ülke: Türkiye
  • Sayfa Sayıları: ss.132
  • Recep Tayyip Erdoğan Üniversitesi Adresli: Evet

Özet

AIM or PURPOSE

The aim of this study was to investigate the effects of blood contamination and decontamination methods on micro-shear bond strength (µSBS) in deep dentin.

MATERIALS and METHOD

Twenty human molars were collected, and the occlusal surface was abraded to obtain a deep dentin surface. Samples were divided into 4 groups (n = 5): Group 1: Clearfil S3 Bond Universal (CS3; Kuraray Noritake Dental Inc., Okayama, Japan); Group 2: 2 % chlorhexidine (CHX; 60 s) + CS3; Group 3: fresh human contamination (15 s) + CS3; Group 4: fresh human contamination + CHX + CS3. Four composite blocks (Clearfil Majesty Flow; Kuraray Noritake Dental Inc., Okayama, Japan) were placed on the deep dentin surface using tygon tubes (1 mm internal diameter, 2 mm height). The samples were stored for 1 week in distilled water at 37°C and subjected to µSBS (1 mm/min). The fracture surfaces were examined under a stereomicroscope (Stemi 305; Carl Zeiss Microscopy, Göttingen, Germany). One-way ANOVA and post-hoc Tukey's test were used to analyze the data. Statistical significance level was accepted as 0.05.

RESULTS

µSBS data differed significantly among between groups (p = 0.000). Group 3 showed the lowest µSBS (2.13 ± 1.35 MPa), while Group 4 showed the highest µSBS (6.24 ± 2.00 MPa). There was no statistically significant difference between group 2 and group 4. All the groups exhibited predominant adhesive failure.

CONCLUSION(S)

Blood contamination decreased the bond strength of deep dentin. However, decontamination with CHX caused an increase in the bond strength of deep dentin.