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The influence of various surface-conditioning methods on shear bond strength of metal brackets bonded to full ceramic restorations. (Alaboratory Study)

تأثير طريقة تهيئة السطح الخزفي على قوة الإلصاق المقاومة لجهد القص للحاصرات التقويمية المعدنية الملصقة على الترميمات الخزفية الكاملة

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 Publication date 2015
  fields Dentistry
and research's language is العربية
 Created by Shamra Editor




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With the increase in the number of adult patients seeking orthodontic treatment, the need to ensure sufficient bonding strength for the fixed orthodontic components on the ceramic restorations has become an urgent matter. Adhesion of the orthodontic bracket is an essential and indispensable step.



References used
سايس س , البني ص , المرجع في المواد السنية , منشورات جامعة دمشق 2012
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Since the solution of direct bonding of orthodontic brackets as an alternative to full encircling of the dental arch, researchers have begun conducting studies to evaluate the adhesion materials and different methods of enamel preparation to reach the most appropriate method for the requirements of ideal adhesion.
The laser has been used as an alternative effective method of etching enamel surface for direct bonding of orthodontic brackets instead of phosphoric acid. The aim of this study was to compare shear bond strength of orthodontic brackets following Er- YAG versus Nd-YAG Laser etching. Eighty human extracted upper premolars were collected and divided randomly into two equal groups; the buccal enamel surface of the first group was etched by Er-YAG laser while the second group was etched by Nd-YAG laser. Each group was divided into two equal subgroups according to the bonding material type (chemical cure resin or light cure resin). The mechanical test has occurred by using a universal testing machine (Instron). The finding showed that no statistically significant differences in mean of shear bond strength between (Nd-YAG, Er-YAG) Laser etching group were found regardless of the bonding type.
Background Resin bonded fixed partial dentures appeared to prevent the excessive preparation of dental tissue Investigation of surface treatments to improve the bond of resin cements to metals may contribute to the longevity of these restoration s. Due to the potential lack of ideal preparation form the type of alloy and its surface pretreatment may have clinically relevant correlations with the retentive strength of castings to minimally retentive preparations Aim The aim of this search is to study the bonding resin cement strength to different types of the metal alloy due to the surface treatment Purpose Evaluate the effects of two different surface treatments on shear bond strength SBS between a palladium silver alloy Pb Ag and commercially pure titanium CP Ti cast alloy with resin luting cements
The aim of this study To compare in vitro shear bond strength (SBS) of different orthodontic adhesives in and rebonding metal brackets after preparing their bases mechanically. Material and methods:Sample consisted of 40 extracted first premolars, randomly divided into two groups (n=20),.Adhesive removed by tungsten carbide bur later the brackets were rebonded. The tests were performed in a tecnotest (6kN) SBS testing machine, at a speed of 1 mm/min. It was found that the mean shear bond strength of Reseliencewas 19.25 MPa and that of Heliosit orthodontic was 10.25MPa.We foundthat the mean shear bond strength of rebonding forReselience was 13.70 and 7.95 forHeliosit.The t-test revealed that there was a significant difference between the shear bond strength of the two groups. We found a significant difference between bonding and rebondingfor Reselience,while there was no significant difference between bonding and rebonding for Heliosit.
This study aimed to compare the effects of different enamel etching techniques for bracket bonding strength. The sample consisted of eighty human premolars were randomly divided into four equal groups. The enamel surfaces of the teeth were etched with 35% orthophosphoric acid in Group 1 , air abraded with 50 μm aluminum oxide prior to acid etching in Group 2, Trans bond Plus Self-etching Primer (TPSEP) in Group 3 , Er: YAG laser in Group 4. After enamel etching procedures, brackets were bonded with Trans bond XT , then shear bonding test was performed using a testing machine (Tinius Olsen).

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