A comparison of bond strength and adhesive remnant index of 3D-printed and metal orthodontic brackets attached using different adhesives

Abstract Introduction The aim of this in vitro study was to evaluate the shear bond strength (SBS) and adhesive remnant index (ARI) scores two different applications aesthetic brackets produced from permanent crown material using 3D-printing technology. Methods Sixty maxillary premolar teeth extracted for orthodontic reasons were divided into main groups according type bracket (metal n =30, 3D-printed =30) further subgroups (flowable composite, Tokuyama SuperLow; non-flowable composite; 3M Transbond XT). SBS ARI score evaluations conducted experimental control ( =15). Statistical analysis performed by a one-way variance, post-hoc test, Fisher’s exact test. significance accepted as P < 0.05. Results specimens significantly affected composite 0.001). However, values within or above desired range treatment all groups. highest value obtained Metal Bracket-Transbond XT group (15.03 ± 6.66), while lowest observed 3D-Printed (7.91 3.07). It noted that materials evaluated, most common non-enamel-damaging adhesive–cohesive fractures Bracket SuperLow =13). Conclusions is recommended have sufficient acceptable levels clinical bonding adhesives produce high flowable generating scores.