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1.
Article in English | IMSEAR | ID: sea-139950

ABSTRACT

Background and Objectives: One of the most difficult problems encountered in orthodontic treatment with fixed appliance is the control of enamel demineralization around the brackets. Fluoride-releasing bonding adhesives were introduced to aid in the prevention of demineralization adjacent to orthodontic brackets. Hence, an in vitro study was conducted to evaluate and compare demineralization adjacent to the orthodontic bracket and the bond strength using fluoride-releasing adhesive and conventional adhesive. Materials and Methods: One hundred and twenty healthy extracted premolars were selected for the study and were divided into two groups, each group consisting of 60 teeth. Both groups were further divided into three subgroups consisting of 20 samples each. Samples of subgroups A and B were bonded with two prototypes of fluoride-releasing adhesives (i.e. Rely-a-bond and Tru-bond). Samples of subgroup C (ortho-one) were bonded with conventional non-fluoride-releasing adhesive. Group I samples were subjected to demineralization in an acidic medium (methyl cellulose buffered with acetic acid at a pH of 4.5) for 4 weeks, which were later observed under a stereomicroscope. Group II samples were tested for shear bond strength using the Instron Universal testing machine. Results: Both fluoride-releasing adhesives showed statistically significant lower enamel demineralization around the bracket when compared with the conventional adhesive. There was no statistically significant difference on comparing the demineralization between the two prototypes of fluoride-releasing adhesive. Evaluation of shear bond strength revealed that there was no significant difference between the subgroups. Conclusion: Fluoride-releasing adhesives might aid in the prevention of demineralization adjacent to the orthodontic bracket with acceptable bond strength.


Subject(s)
Bisphenol A-Glycidyl Methacrylate/chemistry , Bisphenol A-Glycidyl Methacrylate/therapeutic use , Cariostatic Agents/administration & dosage , Cariostatic Agents/chemistry , Delayed-Action Preparations , Dental Bonding , Dental Enamel/pathology , Fluorides, Topical/administration & dosage , Fluorides, Topical/chemistry , Humans , Orthodontic Brackets/adverse effects , Polyethylene Glycols/chemistry , Polyethylene Glycols/therapeutic use , Resin Cements/chemistry , Resin Cements/therapeutic use , Shear Strength , Tooth Demineralization/etiology , Tooth Demineralization/pathology , Tooth Demineralization/prevention & control
2.
Article in English | IMSEAR | ID: sea-51829

ABSTRACT

The present study was undertaken to investigate the effect on enamel surface, penetration depth, and bond strength produced by 37% phosphoric acid and 20% sulfated polyacrylic acid as etching agents for direct bonding. Eighty teeth were used to study the efficacy of the etching agents on the enamel surface, penetration depth, and tensile bond strength. It was determined from the present study that a 30 sec application of 20% sulfated polyacrylic acid produced comparable etching topography with that of 37% phosphoric acid applied for 30 sec. The 37% phosphoric acid dissolves enamel to a greater extent than does the 20% sulfated polyacrylic acid. Instron Universal testing machine was used to evaluate the bond strengths of the two etching agents. Twenty percent sulfated polyacrylic acid provided adequate tensile bond strength. It was ascertained that crystal growth can be an alternative to conventional phosphoric acid etching as it dissolves lesser enamel and provides adequate tensile bond strength.


Subject(s)
Acid Etching, Dental/methods , Acrylic Resins/chemistry , Crystallization , Dental Alloys/chemistry , Dental Bonding , Dental Enamel/drug effects , Dental Enamel Solubility , Dental Stress Analysis/instrumentation , Dentin-Bonding Agents/chemistry , Humans , Materials Testing , Microscopy, Electron, Scanning , Orthodontic Brackets , Phosphoric Acids/chemistry , Resin Cements/chemistry , Stainless Steel/chemistry , Stress, Mechanical , Surface Properties , Tensile Strength , Time Factors
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