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    Bond strength of metal brackets to feldspathic ceramic treated with different surface conditioning methods: an in vitro study
    (Istanbul Univ Press, Istanbul Univ Rectorate, 2021) Recen, Duygu; Yildirim, Bengisu; Othman, Eman; Comlekoglu, Erhan; Aras, Isil
    Purpose To compare MEP which is originally manufactured for increasing bond strength between organic resins and ceramic with conventional surface treatment methods in preparation of leucite-reinforced FC surfaces regarding shear bond strength (SBS) of stainless steel brackets and the mode of bond failure. Materials and Methods Forty specimens that were fabricated from FC material and glazed were randomly assigned to four surface conditioning methods: (1) CoJet Sand; (2) MEP; (3) HF acid etching followed by silane coupling agent; (4) Diamond bur followed by silane coupling agent. The SBS was determined using universal testing machine. Bond failure sites were classified according to Adhesive Remnant Index (ARI). Results No statistically significant difference (p>0.05) was found in SBS between the groups while significant intergroup differences were detected concerning ARI scores (p<0.001). Group 1 had ARI score 1 and 2 indicating mode of failure at the adhesive interface with greater percentage of the adhesive left on bracket base. The other groups had higher frequency of ARI score 3 and 2. The quantity of the ARI retained on the ceramic surface was highest in Group 3, followed by Group 4 and Group 2. Conclusion MEP can be a suitable alternative for bonding metal brackets to FC surface.
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    Bond strength of metal brackets to feldspathic ceramic treated with different surface conditioning methods: an in vitro study
    (2021) Çömlekoğlu, M. Erhan; Aras, Işıl; Recen, Duygu; Yıldırım, Bengisu; Othman, Eman
    PurposeTo compare MEP which is originally manufactured for increasing bond strengthbetween organic resins and ceramic with conventional surface treatment methodsin preparation of leucite-reinforced FC surfaces regarding shear bond strength (SBS)of stainless steel brackets and the mode of bond failure.Materials and MethodsForty specimens that were fabricated from FC material and glazed were randomlyassigned to four surface conditioning methods: (1) CoJet Sand; (2) MEP; (3) HF acidetching followed by silane coupling agent; (4) Diamond bur followed by silanecoupling agent. The SBS was determined using universal testing machine. Bondfailure sites were classified according to Adhesive Remnant Index (ARI).ResultsNo statistically significant difference (p>0.05) was found in SBS between the groupswhile significant intergroup differences were detected concerning ARI scores(p<0.001). Group 1 had ARI score 1 and 2 indicating mode of failure at the adhesiveinterface with greater percentage of the adhesive left on bracket base. The othergroups had higher frequency of ARI score 3 and 2. The quantity of the ARI retainedon the ceramic surface was highest in Group 3, followed by Group 4 and Group 2.ConclusionMEP can be a suitable alternative for bonding metal brackets to FC surface.
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    Comparison of 2 treatment protocols using fixed functional appliances in Class II malocclusion: Treatment results and stability
    (Mosby-Elsevier, 2020) Bozkurt, Aylin Pasaoglu; Aras, Isil; Othman, Eman; Aras, Aynur
    Introduction: the objective of this research was to compare the 2 treatment protocols including a functional mandibular advancer (FMA; Forestadent, Pforzheim, Germany) followed by multibracket appliances (MBAs) vs a Forsus device (3M Unitek, Monrovia, Calif) in combination with MBA concerning treatment outcomes and posttreatment stability. Methods: This study was conducted using lateral cephalograms of patients who were treated with MBA, which was used either after an FMA or concurrently with a Forsus device, and of patients who had untreated Class II malocclusion (control group). Each group consisted of 19 subjects in cervical stage 2 or cervical stage 3 stages according to the cervical vertebral maturation index. Cephalograms were taken for the treated groups at T1 (pretreatment), T2 (completion of the MBA treatment), and T3 (at least 2 years after T2). Results: Significant intergroup differences at the T1-T2 period were observed in favor of the FMA concerning mandibular advancement, intermaxillary relationship, and mandibular elongation. With Forsus treatment, restrained maxillary growth and a slightly improved intermaxillary relationship rebounded after treatment (P <0.05). At the end of treatment, mandibular incisor protrusion and occlusal plane rotation were greater in the Forsus group than in the FMA group (P <0.05), and maxillary incisor retroclination was significant in the Forsus group. During the posttreatment period, although no significant changes were present in the incisors' inclination, relapses of the T1-T2 improvements in overjet and overbite and the recidive of the occlusal plane rotation were significantly higher in the Forsus group. Conclusions: Treatment protocol including an FMA was found to be more effective with mandibular skeletal effects and was more stable with a lesser degree of relapse in overjet and overbite than the Forsus protocol.