Effect of Different Surface Treatments on the Repair of Aged Bulk-Fill Composites: An In Vitro Study
Objectives: The aim of this in vitro study was to evaluate the efficiency of different surface treatments on the microtensile bond strength (µTBS) of aged bulk-fill composite.Materials and Methods: Sixty bulk-fill resin-based composite (RBC) specimens in 5 x 5 x 5 dimensions were prepared. After the...
Main Author: | |
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Format: | Article |
Language: | English |
Published: |
Cumhuriyet University
2019-12-01
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Series: | Cumhuriyet Dental Journal |
Subjects: | |
Online Access: | https://dergipark.org.tr/tr/download/article-file/903905 |
Summary: | Objectives: The aim of this in vitro study was to evaluate the efficiency of different surface treatments
on the microtensile bond strength (µTBS) of aged bulk-fill composite.Materials and Methods: Sixty bulk-fill resin-based
composite (RBC) specimens in 5 x 5 x 5 dimensions were prepared. After the
aging by thermal cycling for 5000 times between 5 and
55°C, substrate surfaces were abraded with SiC abrasive papers. Specimens
were divided into 6 groups according to the surface treatment protocol: no
surface treatment (control), control + Single Bond Universal (SBU; 3M ESPE)
application, phosphoric acid etching (PA) + SBU, hydrofluoric acid etching (HF) + SBU, aluminum oxide air
abrasion (AlO) + SBU, and tribochemical silica coating (TSC) + SBU. Surface roughness values were measured in five different
directions using a contact profilometer (n=10). Then, specimens were repaired
with a conventional RBC. After the repair, bonded specimens were cut into 1 mm2
beams and µTBS values were determined until failure at a crosshead speed of 0.5
mm/min. Specimen surfaces after surface treatments were observed by SEM.
Data were analyzed using ANOVA and Tukey
tests (p<0.05). Results: One-way ANOVA revealed significant difference
(p<0.001) among the surface
treatments. The lowest repair µTBS values were observed for the control group. SBU
application alone significantly improved repair µTBS values (p<0.001). The highest µTBS values
were obtained for the AlOand TSC, and HF followed. The surface
roughness ranking for the five surface treatment protocols was as follows: TSC
> AlO > HF > PA = Control.
Conclusions: Aged bulk-fill RBCs can be successfully
repaired if effective and safe repair protocol is chosen. The highest µTBS
values were obtained for the AlO and TSC. The use of universal adhesive alone is
promising to facilitate the repair of bulk-fill RBCs. |
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ISSN: | 1302-5805 2146-2852 |