Abstract
Flash-Free Orthodontic Adhesive System represents the latest technology in the field of orthodontics. In the present study the bonding technique is applied on CAD/CAM produced resin crowns. Ten resin blocks were shaped after an upper premolar crown design from the 3Shape Library, and they were divided ino two groups: on Group 1, control, Clarity Advanced braces (3M Unitek, Monrovia, CA, USA) were bonded using XT Adhesive Paste (3M Unitek, Monrovia, CA, USA), while on Groups 2 same aesthetic brackets were applied, using the APC Flash-Free Adhesive Coated Appliance System (3M Unitek, Monrovia, CA, USA). Bracket positioning time was recorded for each sample. Zwick Zoel Z005 testing machine was used to measure the shear bond strength (SBS) at which debonding takes place. Adhesive remnant index (ARI) was registered, as well as presence or absence of adhesive flash and accuracy of flash cleaning before curing. Group 1 showed a mean bonding time of 46.4 s, while Group 2 needed about 20.6 s for each bracket bonding. Mean SBS values for both groups are considered clinically acceptable (6.27 MPa for Group 1 and 7.77 MPa for Group 2). ARI scores were zero for all samples and after debonding, on group 1 can be observed the adhesive flash. In conclusion, APC Flash-Free Coated Appliance System showed reduced time for bracket positioning compared to the conventional technique. APC Flash-Free System showed acceptable SBS values, higher than the uncoated brackets. No composite was left on the resin crown after debonding, the adhesive flash resulted in the conventional technique remaining on the edges of the debonded brackets.
Highlights
Flash-Free Orthodontic Adhesive System represents the latest technology in the field of orthodontics
Several authors [6,7,8,9,10] studied the bond strength of different adhesives used to attach metal brackets to resin surfaces, but there is no research on the bond between a ceramic bracket and a resin restoration. 3M Unitek (Monrovia, CA, USA) offers this new concept, APC FlashFree Adhesive Coated Appliance System, which they support presents higher bond strength than the same brackets, Clarity Advanced (3M Unitek, Monrovia, CA, USA), bonded by the classical method, where adhesive is applied by the clinician on the bracket base [11]
Considering that the entire adhesive was separated from the resin crowns, on the images obtained after debonding, it can be observed the flash of adhesive present in Group 1, of uncoated brackets(fig.2, 3)
Summary
DENISA MARIA GOLBAN1, RADU NEGRU2, CAMELIA SZUHANEK1*, MEDA LAVINIA NEGRUTIU1, LIVIU MARSAVINA2, VIRGIL FLORIN DUMA2,3, COSMIN SINESCU1, LILIANA POROJAN1 1Victor Babes University of Medicine and Pharmacy of Timisoara, Faculty of Dental Medicine, 2 Eftimie Murgu Sq., 300041 Timisoara, Romania 2Politehnica University of Timisoara, Faculty of Mechanical Engineering, 1 Mihai Viteazu Ave., 300006 Timisoara, Romania 3 Aurel Vlaicu University of Arad, 3OM Optomechatronics Group, Faculty of Engineering, 77 Revolutiei Ave., 310130 Arad, Romania. In the present study the bonding technique is applied on CAD/CAM produced resin crowns. APC Flash-Free Coated Appliance System showed reduced time for bracket positioning compared to the conventional technique. Due to the high degree of polymerisation, it is hard to achieve a high bond strength between the resin crown and adhesive cements [5] This is the reason why bracket bonding to these surfaces can be difficult. We studied the shear bond strength formed between APC Flash-Free aesthetic brackets and a CAD/CAM produced resin teeth without any surface treatment prior bonding
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