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The Microetching Effect on the Shear Bond Strength of Orthodontic Metal Brackets

Author: Hakam H Sabah
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2011 Volume: 11 Issue: 17 Pages: 37-44
Publisher: Mosul University جامعة الموصل

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Abstract

Aims: To evaluate and to compare the shear bond strength of new brackets, new microetched brackets and debond microetcher clean brackets when bond to virgin and previously bond teeth. Materials and methods: Thirty human premolars were randomly assigned into three groups, 10 teeth for each. Group V1 (virgin teeth bonded by new brackets), group V2 (virgin teeth bonded by new microeched brack-ets), and group V3 (virgin teeth bonded by debonded micretched cleaned brackets). All groups tested for shear bond strength. After that all teeth cleaned from composite and randomly assigned again into three groups, 10 teeth for each group. Group P1 (previously bonded teeth rebonded by new brackets), group P2 (previously bonded teeth rebonded by new microetched brackets), and group P3 (previously bonded teeth rebonded by debonded microetched clean brackets) and again all groups tested for shear bond strength. Results: There are no significant differences between virgin teeth groups and previously bonded teeth when clean previously bonded teeth from old adhesive as descried in this study however the previously bonded teeth groups showed the lower mean value than virgin teeth. New microetched and debonded micretched brackets groups showed significantly higher value in comparing with new bracket groups while there were no significant differences between new micretched and debonded mi-croetched groups with greater mean value for new micretched groups. Conclusion: Bracket recycled by microetching using 50–μm aluminum oxide particle was appears to be very effective method for bracket accidental debonded and Previously bonded teeth had shear bond strengths comparable to vir-gin teeth(new bonded) when adhesive remnant removed by

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Article
Effect of chlorhexidine mouth wash and flouridated mouth wash on mechanical properties of orthodontic arch wires (An in vitro study)

Authors: Khawla M Awni --- Hind T Jarjees --- Hakam H Sabah
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2011 Volume: 11 Issue: SpIss Pages: S150-S159
Publisher: Mosul University جامعة الموصل

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Abstract

Aims: The aims of the this study were to measure the effect of chlorhexidine and fluoridated mouth wash on mechanical properties of stainless steel and nickel titanium wires and to study the effect of three time intervals (3, 7, and 10 days) immersion on these mechanical properties. Materials and Methods: Two types of orthodontic wires were taken which included stainless steel and superelastic nickel titanium wires (Dentaurum, Germany). The 0.016×0.016 inch wires were selected. Each type of wires divided into seven groups; control group and six experimental groups in which the wires immersed in the chlorhexidine and fluoridated mouth wash for 3, 7, and 10 days and then the mechanical properties of wires (yield stress, ultimate tensile stress, modulus of elasticity) measured by using the universal tensile testing machine. Results: The results of the present study showed that a significant difference in the mechanical properties of both stainless steel and nickel titanium wires between the control group and experimental groups immersed in the fluoridated mouth wash and this decreased in the mechanical properties as immersion time increased. Also the results of the present study showed that a non significant difference in the mechanical properties of both stainless steel and nickel titanium wires between the control group and experimental groups immersed in the chlorhexidine mouth wash. Conclusions: The results of the present study indicated that the fluoridated mouth wash decreased the mechanical properties of stainless steel and nickel titanium wires and this degradation in mechanical properties could contributed to prolong orthodontic treatment. While the chlorhexidine has no effect on mechanical properties of stainless steel and nickel titanium wires

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