Volume 36, Issue 263 (11-2026)
J Mazandaran Univ Med Sci 2026, 36(263): 124-134 |
Back to browse issues page
Download citation:
BibTeX | RIS | EndNote | Medlars | ProCite | Reference Manager | RefWorks
Send citation to:
BibTeX | RIS | EndNote | Medlars | ProCite | Reference Manager | RefWorks
Send citation to:
Etezadi T, Mollaei M, Bajouri A, Armin M, Nikbakht R, Namdar P. Shear Bond Strength of Orthodontic Brackets Bonded with Two One-Step Primer-Containing Composites and a Conventional Composite Used with a Separate Primer: An In Vitro Study. , J Mazandaran Univ Med Sci. 2026; 36 (263) :124-134
URL: http://jmums.mazums.ac.ir/article-1-23078-en.html
URL: http://jmums.mazums.ac.ir/article-1-23078-en.html
Abstract: (29 Views)
Background and purpose: Adequate bracket–enamel bond strength is essential for the success of fixed orthodontic treatment. This study compared the shear bond strength (SBS) of two one-step, primer-containing composites (GC Ortho Connect and Orthocem) with that of the conventional Brace Paste composite used in combination with a separate primer.
Materials and methods: In this in vitro study, 66 sound extracted premolars were randomly assigned to three groups (n = 22 per group). After enamel etching with 37% phosphoric acid, metal brackets were bonded using All-Bond Universal primer and Brace Paste in the control group. In the two experimental groups, GC Ortho Connect and Orthocem were used without an additional primer. The composites were then light-cured. SBS was measured using a universal testing machine. The Adhesive Remnant Index (ARI) was assessed under a stereomicroscope at 10× magnification. Data were analysed using the Kruskal-Wallis test, Mann-Whitney U tests with Bonferroni correction, and Fisher’s exact test. The significance level was set at 0.05.
Results: The mean ± standard deviation SBS values for Brace Paste, Orthocem and GC Ortho Connect were 9.90 ± 3.47, 9.73 ± 2.71 and 15.39 ± 5.01 MPa, respectively. The overall difference among the three groups was statistically significant (P < 0.001). GC Ortho Connect showed significantly higher SBS than both Brace Paste and Orthocem (P < 0.001). No significant association was found between composite type and ARI score distribution (P = 0.674). ARI score 2 was the most frequently observed score in all three groups.
Conclusion: The one-step composite GC Ortho Connect achieved the highest SBS, whereas Orthocem showed comparable bond strength to the conventional composite used with a separate primer. ARI score distributions were similar across the three groups. Under laboratory conditions, the use of these primer-containing composites without a separate primer did not result in SBS values below the clinically acceptable threshold.
Materials and methods: In this in vitro study, 66 sound extracted premolars were randomly assigned to three groups (n = 22 per group). After enamel etching with 37% phosphoric acid, metal brackets were bonded using All-Bond Universal primer and Brace Paste in the control group. In the two experimental groups, GC Ortho Connect and Orthocem were used without an additional primer. The composites were then light-cured. SBS was measured using a universal testing machine. The Adhesive Remnant Index (ARI) was assessed under a stereomicroscope at 10× magnification. Data were analysed using the Kruskal-Wallis test, Mann-Whitney U tests with Bonferroni correction, and Fisher’s exact test. The significance level was set at 0.05.
Results: The mean ± standard deviation SBS values for Brace Paste, Orthocem and GC Ortho Connect were 9.90 ± 3.47, 9.73 ± 2.71 and 15.39 ± 5.01 MPa, respectively. The overall difference among the three groups was statistically significant (P < 0.001). GC Ortho Connect showed significantly higher SBS than both Brace Paste and Orthocem (P < 0.001). No significant association was found between composite type and ARI score distribution (P = 0.674). ARI score 2 was the most frequently observed score in all three groups.
Conclusion: The one-step composite GC Ortho Connect achieved the highest SBS, whereas Orthocem showed comparable bond strength to the conventional composite used with a separate primer. ARI score distributions were similar across the three groups. Under laboratory conditions, the use of these primer-containing composites without a separate primer did not result in SBS values below the clinically acceptable threshold.
Type of Study: Research(Original) |
Subject:
Dentistry
Send email to the article author
| Rights and permissions | |
 |
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License. |
Articles Copyright © The Author(s). Owned by Mazandaran University of Medical Sciences.
Contact Us
Address: Journal Office, Building No. 2, Mazandaran University of Medical Sciences, Moallem Square, Sari.Tel: +98 (011)34484874 Postal code: 48175-866 E-Mail: jmums@mazums.ac.ir Telefax: +98 (011)33262679
