<abstract xmlns="http://www.w3.org/1999/xhtml">

<sec>
<h3>Objectives</h3>
<p>The aim of this study was to evaluate the shear bond strength (SBS) and the adhesive remnant index (ARI) of “GC Ortho Connect”, a new no-primer orthodontic composite, in comparison with Transbond XT composite.</p>
</sec>
<sec>
<h3>Methods</h3>
<p>Sixty extracted human premolars were randomly divided into three groups (<italic>n</italic>=20). All teeth were etched with 37% phosphoric acid after which brackets were bonded using Transbond XT composite (3M Unitek, Monrovia, USA) and its primer in group I, GC Ortho Connect composite (GC Orthodontics, Tokyo, Japan) in group II, and Transbond XT composite without its primer in group III. After 24 hr of storage in distilled water at 37°C, the SBS was measured using a universal testing machine at a crosshead speed of 0.5 mm/min. After debonding, the ARI scores were determined under a stereomicroscope at ×20 magnification. ANOVA and the Kruskal–Wallis test were applied to analyse the data at <italic>P</italic> &lt; 0.05.</p>
</sec>
<sec>
<h3>Results</h3>
<p>The mean SBS value for GC Ortho Connect composite was 15.50±3.25 MPa, which was significantly higher than the value in group I (12.66±3.3 MPa) and group III (11.18±4.94 MPa). The ARI scores showed that the GC Ortho Connect composite mainly exhibited cohesive failure; whereas, most failures in the Transbond XT composite group occurred at the enamel–adhesive interface.</p>
</sec>
<sec>
<h3>Conclusions</h3>
<p>The performance of GC Ortho Connect composite heralds easier and more efficient bonding in orthodontics.</p>
</sec>
</abstract>

Objectives
The aim of this study was to evaluate the shear bond strength (SBS) and the adhesive remnant index (ARI) of “GC Ortho Connect”, a new no-primer orthodontic composite, in comparison with Transbond XT composite.


Methods
Sixty extracted human premolars were randomly divided into three groups (n=20). All teeth were etched with 37% phosphoric acid after which brackets were bonded using Transbond XT composite (3M Unitek, Monrovia, USA) and its primer in group I, GC Ortho Connect composite (GC Orthodontics, Tokyo, Japan) in group II, and Transbond XT composite without its primer in group III. After 24 hr of storage in distilled water at 37°C, the SBS was measured using a universal testing machine at a crosshead speed of 0.5 mm/min. After debonding, the ARI scores were determined under a stereomicroscope at ×20 magnification. ANOVA and the Kruskal–Wallis test were applied to analyse the data at P < 0.05.


Results
The mean SBS value for GC Ortho Connect composite was 15.50±3.25 MPa, which was significantly higher than the value in group I (12.66±3.3 MPa) and group III (11.18±4.94 MPa). The ARI scores showed that the GC Ortho Connect composite mainly exhibited cohesive failure; whereas, most failures in the Transbond XT composite group occurred at the enamel–adhesive interface.


Conclusions
The performance of GC Ortho Connect composite heralds easier and more efficient bonding in orthodontics.

Comparative evaluation of shear bond strength and debonding properties of GC Ortho Connect composite and Transbond XT composite

Australasian Orthodontic Journal

This work is licensed under the Creative Commons Attribution 4.0 International License.

Objectives
The aim of this study was to evaluate the shear bond strength (SBS) and the adhesive remnant index (ARI) of “GC Ortho Connect”, a new no-primer...

Group	Composite	Mean	Std. deviation	Minimum	Maximum	Tukey’s Test
I	Transbond XT with primer	12.66	3.3	7.18	18.21	A*
II	GC Ortho Connect	15.50	3.25	10.82	20.78	B
III	Transbond XT without primer	11.18	4.94	5.50	24.28	A

ARI score*
Groups	Composite	0	1	2	3	Mann–Whitney U Test
I	Transbond XT with primer	9 (45%)	6 (30%)	4 (20%)	1 (5%)	A**
II	GC Ortho Connect	5 (25%)	2 (10%)	8 (40%)	5 (25%)	B
III	Transbond XT without primer	11 (55%)	4 (20%)	4 (20%)	1 (5%)	A

Comparative evaluation of shear bond strength and debonding properties of GC Ortho Connect composite and Transbond XT composite

Published Online: Dec 22, 2023

Page range: 35 - 41

Received: Aug 01, 2022

Accepted: Dec 01, 2022

DOI: https://doi.org/10.2478/aoj-2023-0004

© 2023 Somayeh Bahrami et al., published by Sciendo

This work is licensed under the Creative Commons Attribution 4.0 International License.

Descriptive and analytical statistics of shear bond strength (MPa) of the three groups (n=20).

Experimental groups (n=20).

Frequency distribution and percentage of the adhesive ARI scores in the three groups(n=20).

Groups	Etchant	Primer	Composite resin
I	37% phosphoric acid	Transbond XT	Transbond XT
II	37% phosphoric acid	–	GC Ortho Connect
III	37% phosphoric acid	–	Transbond XT