Title: 0842 - Efficiency of Self-Adhesive Resin Cement in Orthodontic Bracket Bonding and Cement Effect on Enamel Surface After Debonding


Rania Mitwally (Presenter)
King Abdulaziz University

Zuhair Bakhsh, Orchid Dental Clinic
Rabab Feteih , King Abdulaziz University
Ahmed Bakry, King Abdulaziz University
Mona Abbassy, King Abdulaziz University


Objectives: Debonding of Orthodontic brackets is associated with the presence of remaining resin onto or within the enamel structure due to the formation of resin tags. These remnants of resin may jeopardize the esthetic quality obtained after finalizing the orthodontic treatment. The current study aimed at investigating the performance of the self-adhesive resin cement, Multilink Speed (ML), for orthodontic metal brackets bonding on enamel surfaces through testing the shear bond strength (SBS), and evaluating the amount of adhesive left on enamel surfaces after debonding, adhesive remnant index (ARI). Moreover, the penetration of resin within the structure of the enamel surface was evaluated.

Methods: Ninety human premolar teeth were randomly allocated into 3 groups according to the bonding materials used to bond metal brackets on teeth labial surfaces: group 1 (Control), teeth were bonded using the total-etch adhesive system, Transbond XT; group 2 (ML), teeth were bonded using ML; and group 3 (Etching+ML), teeth were bonded using the ML after etching the enamel surfaces. SBS testing was conducted and (ARI) scores were observed using a stereomicroscope. SEM/EDS observation for the penetration of resin tags into the enamel surface was conducted. One-way ANOVA test was used to compare the SBS results p<0.05. The Kruskal-Wallis test was performed to analyze the ARI scores p<0.05.

Results: ML was associated with a significantly lower SBS (12.58±4.14 MPa) than Transbond XT (22.38±6.08 MPa). Etching the enamel surface before applying ML significantly increased the SBS values with mean SBS, (19.74±4.27 MPa). ML group showed the least resin penetration into enamel and the least ARI scores.

Conclusions: The bond magnitude of ML is within the acceptable clinical bond strength with the advantage of less time-consuming technique and minimum amount of resin penetrating the enamel surface.

Student Presenter

Disclosure Statement:
The submitter must disclose the names of the organizations with which any author have a relationship, the nature of the relationship, and the clinical or research area involved. The following is submitted: NONE