Download or read book The Effect of Pre cure Bracket Movement on the Shear Bond Strength of Metal Brackets written by T. Luke Roberts and published by . This book was released on 2007 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book In Vitro Bond Strength of Orthodontic Brackets and Resin Composite Cement Degree of Conversion as a Function of Pre cure Temperature written by David Richard Ries and published by . This book was released on 2010 with total page 94 pages. Available in PDF, EPUB and Kindle. Book excerpt: The goal of this study was to evaluate the shear bond strength of orthodontic brackets and corresponding resin composite cement degree of conversion as function of pre-cure temperature. Orthodontic brackets were bonded to paired maxillary premolars or mandibular third molars in an environmental chamber with either room temperature (control) or warmed (68°C) resin cement. Bonding was followed immediately by shear testing of the bracket/cement/tooth interface. Residual resin cement on the bracket base was evaluated using micro-Raman spectroscopy to measure the degree of conversion of the cement from ratios of spectral peak heights at 1610cm−1 and 1640cm−1. Results showed no difference in shear bond strength or degree of conversion between room temperature and pre-warmed groups. Also, there was no difference in bond strength between premolar and third molar groups. The evidence suggests that pre-warming resin composite cement is not beneficial for increasing shear bond strength.

Download or read book The Effect of Surface Treatments and Bonding Agents on the Shear Bond Strengths of Orthodontic Brackets Bonded to Aged Composite Resin Restorations written by Matthew Yun Sun Tse and published by . This book was released on 2013 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt: Objective: To compare the mean bond strengths and mode of bond failure, in vitro, of five bonding systems (MIP 1, Plastic Conditioner 2, Assure 2, Scotchbond 3, and Transbond XT 1), when bonding an orthodontic bracket to an artificially-aged composite resin restoration, with and without mechanical surface preparation with a diamond bur. Methods: Class V buccal composite resin restorations were prepared in 240 upper right central incisor dentoform teeth. The restorations were artificially age d for 35 days, bonded with metal brackets, stored in distilled water at 37°C for 30 days, thermocycled for 500 cycles, and subsequently debonded with an Instron universal testing machine. Results: The mean bond strengths for Transbond, MIP, Plastic Conditioner, Assure, and Scotchbond groups were 12.1, 12.3, 13.3, 17.2, and 17.7 MPa respectively. The mean bond strengths for Transbond+Diamond, MIP+Diamond, Plastic Conditioner+Diamond, Assure+Diamond, and Scotchbond+Diamond groups were 18.5, 16.4, 19.1, 19.5, and 20.7 MPa respectively. ANOVA revealed a statistically significant diffe rence (P d"0.05) among the groups. Conclusions: Mechanically roughening the surface of a composite resin restoration with a diamond bur, provided significantly greater bond strengths, regardless of the bonding resin used. However, Assure and Scotchbond, without diamond bur preparation, provided similar bond strengths to Transbond, MIP and Plastic Conditioner, with diamond bur preparation. 1. 3M Unitek, Monrovia CA 2. Reliance Orthodontic Products, Itasca IL 3. 3M ESPE, St. Paul MN.

Download or read book The Effect of the Blue Light Diode Laser on Shear peel Bond Strength of Orthodontic Brackets with Varying Curing Time and Distance written by Kamran Shaikh and published by . This book was released on 2010 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Background: Light cured composite resin can be time consuming for bonding orthodontic brackets. A new Blue light diode laser may reduce curing times for composite resins. Hypothesis: The laser will achieve similar bond strengths in half the time and at greater distances as the LED. Methods: 90 extracted premolars will be bonded and cured using Laser and LED curing units at varying times, another 120 extracted premolars will be bonded and cured at varying distances. An Instron machine will be used to test shear bond strength. Results: The laser was not able to achieve similar bond strengths as the LED curing light in half of the curing time. At 5 seconds, the laser had 35% lower bond strengths but was still in the clinically acceptable range. The laser achieved similar bond strengths when the curing tip was at greater distances as when it was close to the bracket-adhesive-tooth interface.

Download or read book Optimizing the Shear Bond Strength of Orthodontic Brackets Using Hybrid Glass Ionomer Materials written by Yung-Jeng Song and published by National Library of Canada = Bibliothèque nationale du Canada. This book was released on 1996 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Effect of Delayed Polymerization Time and Bracket Manipulation on Orthodontic Bracket Bonding written by Michael J. Ponikvar and published by . This book was released on 2014 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study examined the effect of bracket manipulation in combination with delayed polymerization times on orthodontic bracket shear bond strength and degree of resin composite conversion. Orthodontics brackets were bonded to extracted third molars in a simulated oral environment after a set period of delayed polymerization time and bracket manipulation. After curing the bracket adhesive, each bracket underwent shear bond strength testing followed by micro-Raman spectroscopy analysis to measure the degree of conversion of the resin composite. Results demonstrated the shear bond strength and the degree of conversion of ceramic brackets did not vary over time. However, with stainless steel brackets there was a significant effect (p ≤ 0.05) of delay time on shear bond strength between the 0.5 min and 10 min bracket groups. In addition, stainless steel brackets showed significant differences related to degree of conversion over time between the 0.5 min and 5 min groups, in addition to the 0.5 min and 10 min groups. This investigation suggests that delaying bracket adhesive polymerization up to a period of 10 min then adjusting the orthodontic bracket may increase both shear bond strength and degree of conversion of stainless steel brackets while having no effect on ceramic brackets.

Download or read book The Effect of Variation in Orthodontic Bracket Pad Design on Shear Bond Strength Adhesive Thickness Tooth Adaptation and Curing Light Penetration written by Jennifer M. Messenger and published by . This book was released on 2013 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Shear Bond Strength of Orthodontic Bracket Base Shapes to Human Enamel an in Vitro Study written by Ziana Esmail and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Introduction: There is a growing demand for esthetic appliances during orthodontic treatment, with a specific interest in WildSmiles shaped brackets amongst children and adolescents. Bond failure of brackets over the course of orthodontic treatment can result in increased treatment time, increased overhead costs, and feelings of frustration for the patient and practitioner. Objective: The purpose of this study was to the evaluate the effect of orthodontic bracket base shape on shear bond strength (SBS) to human enamel, in vitro, at two time points, as well as the nature of debonding fractures using the Adhesive Remnant Index (ARI). Methods: Orthodontic brackets with different shaped bases (flower, heart, rectangular) were bonded to 120 extracted human third molars. SBS was measured using a Servohydraulic Test System at 24 hours and 2 months after initial bonding. ARI scores were evaluated under 10x magnification to assess the amount of resin left on the tooth. Results: The control bracket with a rectangular base shape had the highest mean SBS (26.78 ± 8.19 MPa), and significantly differed from flower (17.19 ± 4.45 MPa) and heart (18.86 ± 3.50 MPa) base shapes (p 0.001). The mean SBS of flower and heart shaped brackets did not differ considerably from each other (p 0.05). The mean SBS between debond times at 24 hours (21.50 ± 7.46 MPa) and 2 months (20.38 ± 6.69 MPa) were not statistically significant (p > 0.05). Analysis of ARI scores showed a significant difference between Flower-24 hours vs Heart- 2 months (p=0.039), Flower-24 hours vs Heart- 24 hours (p=0.004), and Control-2 months vs Heart-24 hours (p=0.015). The heart shaped bracket had a greater proportion of adhesive bond failures at the enamel-resin interface. Conclusion: Bracket base shape has an effect on SBS, with the rectangular base shape having a higher mean SBS compared to flower and heart base shapes. All bracket shapes had bond strengths above the clinically acceptable range of 6-8 MPa, and thus may provide adequate SBS in a clinical situation. Variations in ARI scores occurred based on bracket shape and were of a mixed adhesive-cohesive nature.

Download or read book The Effects of an Air powder Polishing Device on the Shear Bond Strength of Two Orthodontic Metal Bracket Adhesive Systems written by Patti Ann Hawkins Jacob and published by . This book was released on 1991 with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this investigation was to evaluate the effects of air-powder polishing on shear bond strength in vitro for two metal bracket adhesive systems currently in use for direct orthodontic bonding procedures. Ninety-six third molar teeth with flattened enamel surfaces were randomly assigned to be bonded with metal brackets using either a two paste or a no-mix orthodontic adhesive resin. Thwelve samples in each treatment group were air-powder polished for 0, 15, 30, or 60 seconds. Each bracket adhesive bond was then tested for shear strength using the Instron Universal Testing Device. Scanning electron microscopy determined the fracture pattern of representative samples from each treatment group. Mean shear bond strength values for each treatment group were calculated and expressed in magapascals (MPa). Values from baseline to 60 seconds varied from 22.9 ± 1.9 MPa to 18.2 ± 4.1 MPa for the two paste system and from 15.5 ± 2.1 MPa to 14.6 ± 1.9 MPa for the no-mix adhesive. Differences between the adhesive systems at all air-powder polishing times were statistically significant (p d".05). Statistical analysis by a two-way ANOVA in combination with the Newman-Keuls Multiple Range Test for pairwise mean comparisons determined a differential effect of air-powder polishing on the bond strength of the two adhesive systems. After 60 seconds of air-powder polishing, results showed a significant decrease (p d".05) in the mean bond strength of the two paste adhesive resin when compared to baseline, 15, and 30 second treatments. No significant time effect of air-powder polishing was found for the no-mix adhesive system. SEM analysis of the bond failure sites showed tooth-adhesive, within adhesive and bracket-adhesive fracture patterns for the viewed samples of each adhesive type and air-powder polishing treatment time. Fractures within tooth structure were also noted for the two paste system, indicating strong enamel-adhesive-bracket bonds. Differences in the fracture pattern of the two paste 60 second air-powder polishing group may account for the differential effect of treatment. Although in vitro results showed decreased bond strength for the two paste system, use of air-powder polishing for the routine maintenance of the orthodontic patient should not affect clinical performance of this adhesive.

Download or read book Effects of High Speed Curing Devices on Shear Bond Strength and Microleakage of Orthodontic Brackets written by Jeffrey W. James and published by . This book was released on 2001 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Effect of Bracket Base Design on Shear Bond Strength written by Mark A. Naisbitt and published by . This book was released on 2010 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Influence of Orthodontic Bracket Bonding Protocol on Zirconia Ceramics and Resulting Bond Strength Adhesive Remnant and Debonded Polished Zirconia Surface Roughness written by Kaylee Anne Bergman and published by . This book was released on 2019 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt: Objective: This study evaluated the effect of primer protocol for metal orthodontic brackets bonded to zirconia ceramic and resulting shear bond strength (SBS), adhesive remnant index (ARI), and debonded and polished zirconia surface roughness. Methods: Zirconia specimens were milled, glazed, embedded in acrylic resin and the target area microetched with aluminum oxide. Glazed and microetched representative specimens were evaluated with energy dispersive spectroscopy (EDS). Specimens were randomly assigned to primer protocol, enamel (TransbondTM Plus Self-Etching Primer) or zirconia (Assure® Plus), and primed according to manufacturer instructions. Metal orthodontic brackets were bonded to the primed surface with resin adhesive (Transbond XTTM) and light cured. To simulate intraoral conditions, all primer and bonding protocols took place in an environmental chamber set at 33±2°C and 75±5% humidity followed by a 24-hour dark cure at 37 C. Following SBS testing, an ARI value was assigned to debonded brackets. Residual adhesive was removed from the debonded zirconia specimens, the zirconia surface polished, and surface roughness measured using a profilometer. Scanning electron microscopy (SEM) was performed for qualitative evaluation of the zirconia surface. Results: Zirconia substructure exposure by aluminum oxide microetching was verified with EDS. A significantly lower (p

Download or read book Effect of Highly Filled Light cured Resin Sealant on Bracket Shear Bond Strength in Demineralization Conditions written by Brad Michael Chun and published by . This book was released on 2018 with total page 39 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study examined the effect of a highly filled light-cured sealant (HFLCS) on bracket shear bond strength and subsequent adhesive remnant index (ARI) following exposure to cariogenic challenge. Specimens were divided into two groups to receive conventional primer or HFLCS prior to orthodontic bracket bonding in a simulated oral environment. After curing bracket adhesive, specimens were separated into two storage solutions, either phosphate buffered saline or a demineralization solution (pH 4.1) for 96 hours. Brackets then underwent shear bond strength testing followed by ARI scoring. Enamel surfaces were visually examined for white spot lesion (WSL) severity using a WSL scoring index. HFLCS and exposure to demineralization conditions were not significant factors in shear bond strength or subsequent adhesive fracture pattern (ANOVA, p>.05). The majority of brackets were given an ARI score of 1, meaning that greater than 50% of the resin adhesive remained on the bracket. A significant difference (p

Download or read book Cumulated Index Medicus written by and published by . This book was released on 1991 with total page 1476 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Effect on Shear Bond Strength of Ceramic Brackets at Different Water Temperatures written by Thomas P. Kadar and published by . This book was released on 1993 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Determining the Effect of Primekote Bracket Conditioner on Orthodontic Bond Strength written by Gary L. Jennings and published by . This book was released on 1999 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Effect of Surface Preparation on the Shear Bond Strength of Orthodontic Brackets Bonded to Zirconia written by and published by . This book was released on 2015 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt: