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Comparison of the shear bond strength of reconditioned metal brackets used in indirect bonding: an in vitro pilot study. AUSTRALASIAN ORTHODONTIC JOURNAL 2023. [DOI: 10.2478/aoj-2023-0001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Abstract
Objectives:
This study aimed to compare the shear bond strength (SBS) related to surface treatment methods of debonded brackets before indirect rebonding and to evaluate changes in SBS related to sandblasting time.
Methods:
After brackets were debonded from a dental cast during an indirect bonding procedure, seven groups were assigned to conduct SBS tests. Sandblasted groups were sprayed with Al2O3 for 3 s (Group II), 6 s (Group III), 9 s (Group IV), and 12 s (Group V). In Group VI, a no. 4 round low-speed bur was used to remove resin. In Group VII, the bracket base was coated with a plastic conditioner (Reliance, IL, USA) and Group I served as the control group.
Results:
The SBS of Group VII was not statistically different from that of the control group. The SBS of Group VI was not statistically different from that of Group II but higher than that of the control group (P < 0.05). There was no statistical difference between Groups III, IV, and V, but was greater than the other groups (P < 0.05).
Conclusion:
The group with surface treatment by sandblasting for more than 6 sec prior to indirect bonding recorded a higher SBS than the other groups. The SBS did not increase further even if the sandblasting time increased by more than 9 sec.
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Jiang L, Lin XJ, Chen YH, Yu H. Effects of remaining dentin thickness on the bond strength of bleached dentin. BMC Oral Health 2020; 20:218. [PMID: 32758296 PMCID: PMC7405339 DOI: 10.1186/s12903-020-01206-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2019] [Accepted: 07/30/2020] [Indexed: 11/24/2022] Open
Abstract
Background The bond strength of resin composites to dentin was reported to be related to either the remaining dentin thickness (RDT) or bleaching treatment. However, information is limited regarding the effects of RDT on the bond strength of bleached dentin. The present study aimed to investigate the effects of RDT on the microshear bond strength (μSBS) of resin cement to bleached dentin. Methods A total of 120 dentin specimens were prepared and randomly divided into 2 groups: a bleaching group (group B) and a control group (group C). Hydrogen peroxide with a concentration of 35% (Ultradent, USA) was applied on the dentin surface for 2 × 1 d for group B, while no bleaching treatment was performed for group C. After the treatment, the specimens were finished and polished to obtain different RDTs (2, 1, and 0.5 mm) and divided into 3 groups of 20 specimens each. The bonding procedure was performed using Panavia V5 (Kuraray, Japan) with a bonding area of 0.785 mm2. For each group, half of the specimens were subjected to 5000 thermal cycles (subgroup T), while the other half did not receive thermocycling (subgroup N) (n = 10). The specimens were then subjected to the μSBS test using a universal testing machine. Data were analyzed by a three-way analysis of variance (α = 0.05). The fracture modes of the specimens were confirmed with a measuring microscope. Representative specimens with different fracture modes were observed with scanning electron microscopy (SEM). Results The μSBS values were significantly affected by bleaching treatment (p < 0.001), whereas no significant effect was observed for thermocycling (p = 0.293). In terms of RDT, a significantly different μSBS value was found among the subgroups with different RDTs in group C (p = 0.003). However, the RDT did not significantly affect the μSBS values of bleached dentin in group B (p = 0.779). The μSBS values were significantly lower in group B than in group C (p < 0.001). A higher percentage of adhesive failure was observed in group B than in group C. Conclusion Based on the present findings, it can be concluded that the RDT did not affect the bond strength of resin cement to bleached dentin. Clinical significance Since RDT did not affect the bond strength of resin cement to bleached dentin, bonding procedures should not be performed immediately after intracoronal bleaching, even if the dentin is planned to be removed due to a tooth preparation process.
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Affiliation(s)
- Lei Jiang
- Department of Prosthodontics, School and Hospital of Stomatology, Fujian Medical University, Fuzhou, China.,Research Center of Dental Esthetics and Biomechanics, Fujian Medical University, Fuzhou, China
| | - Xiu-Jiao Lin
- Department of Prosthodontics, School and Hospital of Stomatology, Fujian Medical University, Fuzhou, China.,Research Center of Dental Esthetics and Biomechanics, Fujian Medical University, Fuzhou, China
| | - Ying-Hui Chen
- Department of Prosthodontics, School and Hospital of Stomatology, Fujian Medical University, Fuzhou, China.,Research Center of Dental Esthetics and Biomechanics, Fujian Medical University, Fuzhou, China
| | - Hao Yu
- Department of Prosthodontics, School and Hospital of Stomatology, Fujian Medical University, Fuzhou, China. .,Research Center of Dental Esthetics and Biomechanics, Fujian Medical University, Fuzhou, China.
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Ubaldini ALM, Pascotto RC, Sato F, Soares VO, Zanotto ED, Baesso ML. Effects of Bioactive Agents on Dentin Mineralization Kinetics After Dentin Bleaching. Oper Dent 2020; 45:286-296. [DOI: 10.2341/18-272-l] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
SUMMARY
Objectives:
This study evaluated effects of Bioglass 45S5 (BG) and Biosilicate (BS) remineralization on the chemical composition and bond strength of control dentin (CD) and bleached dentin (BD) surfaces.
Methods and Materials:
Dentin bleaching treatment was performed using the walking bleaching technique with 0.01 g of sodium perborate and 0.5 mL of 3% hydrogen peroxide for 14 days. Remineralization treatment was carried out by rubbing a remineralization solution (0.015 g of BG or BS diluted in 1.35 mL of distilled water) on the etched dentin surface for 30 seconds. Micro-Raman spectroscopy (MRS) was used to quantitatively analyze the mineral matrix ratios of CD and BD (n=5) after remineralization treatment with BG and BS over 15 days of incubation in artificial saliva. The CD and BD discs (n=10) with and without remineralization treatment with BG and BS were restored using a two-step etch-and-rinse adhesive system (Optibond S, Kerr) and five layers of 1-mm-thick composite resin (Filtek Z250, 3M ESPE). The restored dentin discs were sectioned into nine bonded beams with cross-sectional areas of approximately 0.9 mm2 and tested for microtensile bond strength (μTBS). The dentin surface of one fractured beam per tooth was submitted to MRS to characterize the physicochemical composition (n=10) at the interface. The data were analyzed using one-way analysis of variance and the Tukey-Kramer post hoc test (p<0.005).
Results:
MRS bioactive analyses revealed that both BG and BS promoted increased mineral matrix ratios in the CD and BD. Significantly higher μTBS values were found after CD treatment with BG (CD: 57 MPa±11; CD-BG: 78 MPa±15) and when BG and BS were applied to the BD (BD: 42 MPa±5; BD-BG: 71 MPa±14; BD-BS: 64 MPa±11) (p<0.005). The MRS analysis of the fractured dentin beam showed that the remineralization treatment significantly increased the dentin relative mineral concentration and promoted the appearance of new interface peaks, indicating a chemical interaction (p<0.005).
Conclusion:
Remineralization of BD is an effective therapy to restore damage caused by dentin bleaching and acid conditioning. This approach not only increases dentin mineral compounds but also improves dentin's ability to interact chemically with the adhesive system.
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Affiliation(s)
- ALM Ubaldini
- Adriana Lemos Mori Ubaldini, DDS, PhD, Department of Dentistry, State University of Maringá, Maringá, PR, Brazil
| | - RC Pascotto
- Renata Corrêa Pascotto, DDS, PhD, Department of Dentistry, State University of Maringá, Maringá, PR, Brazil
| | - F Sato
- Francielle Sato, PhD, Department of Physics, State University of Maringá, Maringá, PR, Brazil
| | - VO Soares
- Viviane Oliveira Soares, PhD, Department of Science, State University of Maringá, Goioerê, PR, Brazil
| | - ED Zanotto
- Edgar Dutra Zanotto, PhD, Department of Materials Engineering, Federal University of São Carlos, São Carlos, SP, Brazil
| | - ML Baesso
- Mauro Luciano Baesso, PhD, Department of Physics, State University of Maringá, Maringá, PR, Brazil
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Rezaei M, Aliasghar E, Rezvani MB, Chiniforush N, Moradi Z. Effect of Er: YAG Laser on Microtensile Bond Strength of Bleached Dentin to Composite. J Lasers Med Sci 2019; 10:117-124. [PMID: 31360380 DOI: 10.15171/jlms.2019.19] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Introduction: In non-vital tooth bleaching, dentin is in direct contact with the bleaching agent, 1 to 3-week delay is needed to eliminate free radicals from tooth structure. The present study aimed to evaluate the effect of irradiation of Er: YAG laser on immediate microtensile bond strength of bleached dentin to composite. Methods: Sixty sounds human teeth were collected and randomly divided into 4 groups (n=15): no bleaching (NB), opalescence endo hydrogen peroxide (HP) gel bleaching, sodium perborate (SP) bleaching and laser bleaching with heydent gel (LB). The groups were divided into 3 subgroups (n=5): no surface treatment, Er: YAG laser irradiation and 10% sodium ascorbate (SA). All samples were restored and underwent microtensile bond strength testing. Statistical analysis was carried out using one-way and two-way ANOVA. Results: Bond strength in NB-SA group had a significant difference with the NB group (P<0.05) while no significant difference was noted between NB and NB-Er groups (P=0.55). Application of SA and Er: YAG laser after bleaching with SP did not enhance the bond strength (P=0.07). Conclusion: Application of SA and Er: YAG laser after HP gel bleaching significantly enhanced the bond strength. Application of Er: YAG laser after internal bleaching with HP gel could enhance the bond strength.
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Affiliation(s)
- Mohsen Rezaei
- Department of Operative Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | | | | | - Nasim Chiniforush
- Laser Research Center of Dentistry, Tehran University of Medical Sciences, Tehran, Iran
| | - Zohreh Moradi
- Department of Operative Dentistry, Tehran University of Medical Sciences, Tehran, Iran
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Karadas M, Demirbuga S. Influence of a short‐time antioxidant application on the dentin bond strength after intracoronal bleaching. Microsc Res Tech 2019; 82:1720-1727. [DOI: 10.1002/jemt.23337] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2019] [Revised: 06/18/2019] [Accepted: 06/24/2019] [Indexed: 11/07/2022]
Affiliation(s)
- Muhammet Karadas
- Department of Restorative DentistryRecep Tayyip Erdogan University, Faculty of Dentistry Rize Turkey
| | - Sezer Demirbuga
- Department of Restorative DentistryErciyes University, Faculty of Dentistry Kayseri Turkey
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Cavalli V, Sebold M, Shinohara MS, Pereira PNR, Giannini M. Dentin bond strength and nanoleakage of the adhesive interface after intracoronal bleaching. Microsc Res Tech 2018; 81:428-436. [DOI: 10.1002/jemt.22995] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2017] [Revised: 12/18/2017] [Accepted: 01/06/2018] [Indexed: 11/07/2022]
Affiliation(s)
- Vanessa Cavalli
- Department of Restorative Dentistry, Operative Dentistry Division, Piracicaba Dental School; University of Campinas; Bairro Areião, Piracicaba SP, 13414-018 Brazil
| | - Maicon Sebold
- Department of Restorative Dentistry, Operative Dentistry Division, Piracicaba Dental School; University of Campinas; Bairro Areião, Piracicaba SP, 13414-018 Brazil
| | - Mirela Sanae Shinohara
- Department of Restorative Dentistry, Dental Materials Division, Piracicaba Dental School; University of Campinas; Bairro Areião, Piracicaba SP, 13414-018 Brazil
| | - Patrícia Nóbrega Rodrigues Pereira
- Department of Restorative Dental Sciences, Operative Dentistry Division, College of Dentistry; University of Florida; Gainesville Florida 32610
| | - Marcelo Giannini
- Department of Restorative Dentistry, Operative Dentistry Division, Piracicaba Dental School; University of Campinas; Bairro Areião, Piracicaba SP, 13414-018 Brazil
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Iska D, Devanna R, Singh M, Chitumalla R, Balasubramanian SCB, Goutam M. In vitro Assessment of Influence of Various Bleaching Protocols on the Strength of Ceramic Orthodontic Brackets bonded to Bleached Tooth Surface: A Comparative Study. J Contemp Dent Pract 2017; 18:1181-1184. [PMID: 29208795 DOI: 10.5005/jp-journals-10024-2196] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
INTRODUCTION Esthetics is one of the common issues because of which patients consult dental orthodontic treatment. Two ways of tooth bleaching are available these days, which includes in-office bleach and home bleach. Various bleaching protocols are available these days for treating the tooth surfaces. Hence, we planned the present study for investigating the impact of various intracoronal bleaching protocols on shear bond strength of ceramic brackets bonded to tooth surface after bleaching. MATERIALS AND METHODS The present study included assessment of 100 extracted maxillary central incisors with the integrated buccal surface. A resin block was made and individual teeth were embedded in each block. Root canal therapy procedure was performed in all the teeth, after which 2 mm short of tooth apex up to the level of cementoenamel junction, removal of the root canal filling was done. All the samples were broadly divided into four study groups with 25 samples in each group. Bleaching procedure was carried in all the samples intracoronally followed by testing of shear bond strength using universal force testing machine. Following the modified adhesive remnant index (AI), assessment of remaining adhesive on the brackets was done. All the results were compiled and analyzed by Statistical Package for the Social Sciences (SPSS) software version 17.0. RESULTS In the control group, mean shear bond strength was found to be 17.9 MPa. While comparing the carbamide peroxide (CP) group with sodium perborate study group, we observed a statistically significant difference. Nonsignificant results were obtained while comparing the shear bond strength in between sodium perborate group and hydrogen peroxide (HP) group. CONCLUSION Intracoronal bleaching does affect the shear bond strength of ceramic brackets. Sodium perborate bleaching influences shear bond strength more strongly than other bleaching agents such as CP and HP. CLINICAL SIGNIFICANCE In patients undergoing orthodontic treatment, HP is a preferred agent where bleaching has to be followed by orthodontic bonding to the tooth surface.
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Affiliation(s)
- Divya Iska
- Department of Orthodontics, Sri Ramachandra Dental College and Hospital, Chennai, Tamil Nadu, India, e-mail:
| | - Raghu Devanna
- Department of Orthodontics, Faculty of Dentistry, Qaseem Private College, Buraydah, Kingdom of Saudi Arabia
| | - Madhvi Singh
- Department of Periodontist, Dentica Oral Care, Ranchi Jharkhand, India
| | - Rajkiran Chitumalla
- Prosthodontics Division, Department of Oral and Maxillofacial Rehabilitation, Qaseem Private College, Buraydah, Kingdom of Saudi Arabia
| | | | - Manish Goutam
- Department of Prosthodontist, Dentica Oral Care, Ranchi Jharkhand, India
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Chauhan V, Kumar P, Sharma P, Shetty D. Effect of different intracoronal bleaching methods on shear bond strength of ceramic brackets bonded to bleached enamel: An in-vitro study. J Orthod Sci 2017; 6:86-90. [PMID: 28717632 PMCID: PMC5508408 DOI: 10.4103/jos.jos_149_16] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
Abstract
OBJECTIVE To investigate the effect of different intracoronal bleaching methods on the shear bond strength and site of failure of ceramic brackets. MATERIALS AND METHODS Sixty freshly extracted human maxillary incisors were randomly divided into four groups (n = 15). Endodontic access cavity was prepared and root canals were filled, root fillings were removed 2mm apical to the cementoenamel junction, and a 2-mmthick layer of glass ionomer cement base was applied. Group 1 served as the control. Intracoronal bleaching was performed with 35% carbamide peroxide in group 2, sodium perborate in group 3, and 37.5% hydrogen peroxide in group 4. The teeth were immersed in artificial saliva for 4 weeks before bracket bonding. Ceramic brackets were bonded with composite resin and cured with LED light. After bonding, the shear bond strength of the brackets was tested with a universal testing machine. The site of bond failure was determined by modified ARI (Adhesive Remnant Index). RESULTS The highest value of shear bond strength was measured in control group (18.67 ± 1.59 MPa), which was statistically significant from groups 2,3, and 4. There was no significant difference between groups 2 and 4. The lowest shear bond strength was measured in group 3. ARI scores were not significant from each other. CONCLUSIONS Intracoronal bleaching significantly affected the shear bond strength of ceramic brackets even after 4 weeks of bleaching. Bleaching with sodium perborate affects shear bond strength more adversely than does bleaching with other agents like hydrogen peroxide and carbamide peroxide.
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Affiliation(s)
- Vikas Chauhan
- Department of Orthodontics and Dentofacial Orthopaedics, I.T.S Centre for Dental Studies and Research, Muradnagar, Ghaziabad, Uttar Pradesh, India
| | - Piush Kumar
- Department of Orthodontics and Dentofacial Orthopaedics, I.T.S Centre for Dental Studies and Research, Muradnagar, Ghaziabad, Uttar Pradesh, India
| | - Payal Sharma
- Department of Orthodontics and Dentofacial Orthopaedics, I.T.S Centre for Dental Studies and Research, Muradnagar, Ghaziabad, Uttar Pradesh, India
| | - Divya Shetty
- Department of Orthodontics and Dentofacial Orthopaedics, I.T.S Centre for Dental Studies and Research, Muradnagar, Ghaziabad, Uttar Pradesh, India
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The effect of the teeth bleaching with 35% hydrogen peroxide on the tensile bond strength of metal brackets. Sci Rep 2017; 7:798. [PMID: 28400596 PMCID: PMC5429781 DOI: 10.1038/s41598-017-00843-z] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2016] [Accepted: 03/16/2017] [Indexed: 11/13/2022] Open
Abstract
The objective of this study was to determine the effects of teeth bleaching on the tensile bond strength of metal brackets bonded with light-curing adhesive system to the human enamel. 40 recently extracted human permanent molars were used for the study. The mesial buccal surface of each tooth was used as a control group and the distal buccal surface was used as an experimental group. Control group surfaces were not submitted to bleaching, while experimental group surfaces were bleached with in-office bleaching material containing 35% hydrogen peroxide. 30 days after the bleaching, identical premolar metal brackets were bonded to each surface using light-curing adhesive. Both groups were submitted to a tension test, using a universal machine. The tensile bond strength of brackets bonded to the bleached enamel was 15% lower than that of brackets bonded to the unbleached enamel. After debonding, more adhesive was left on the bracket base in experimental group than in the control group. The conclusion of this study was that bleaching with an in-office bleaching material containing 35% hydrogen peroxide reduced the tensile bond strength of orthodontic bracket adhesive to the enamel surface.
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Cakmak F, Koçak S, Koçak MM, Elekdag-Turk S, Turk T. Comparison of Shear Bond Strengths of Ceramic Brackets Using Either Self-etching Primer or Conventional Method After Intracoronal Bleaching. Turk J Orthod 2015. [DOI: 10.13076/tjo-d-15-00006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Fernandes HO, Santos LB, Firoozmand LM. Shear bond strength of an orthodontic self-etching adhesive after intracoronary bleaching. Orthod Craniofac Res 2015; 18:117-24. [PMID: 25600658 DOI: 10.1111/ocr.12067] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/07/2014] [Indexed: 11/30/2022]
Abstract
OBJECTIVES To evaluate the effects of intracoronary bleaching on the bond strength of orthodontic brackets using self-etching and total-etch adhesive systems. MATERIAL AND METHODS In 60 bovine incisors, a coronal lingual access was made to clean the pulp chamber and standardise the thickness of the dentine. The sample was randomly divided into four groups (each n = 15): (CT), control group, without bleaching and bonded with the total-etch system (Transbond(™) XT-3M); (CTSE), without bleaching treatment and bonded with the self-etching system (Transbond(™) Plus Self-Etching Primer-3M); (BT), treated with 35% hydrogen peroxide for internal bleaching and bonded with the total-etch adhesive system; and (BTSE), treated with 35% hydrogen peroxide and bonded with the self-etching adhesive system. Shear bond strength was measured using a universal testing machine (EMIC). The adhesive remnant index (ARI) score was verified. The data were analysed using a two-way anova and Tukey test (p < 0.05). RESULTS Significant differences were found, and the self-etching adhesive groups presented the highest bond strength values (CTSE=11.55 ± 2.85 MPa; BTSE=14.14 ± 2.23 MPa). The ARI scores revealed significant differences among the groups; the greater amount of remaining adhesive was observed in the CTSE group, and the lowest scores were observed in the BT group. CONCLUSIONS The use of the self-etching adhesive system, even after intracoronal bleaching, presented satisfactory adhesive strength for the bonding of brackets.
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Affiliation(s)
- H O Fernandes
- Department of Dentistry, Ceuma University, São Luís, MA, Brazil
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de Oliveira Moreira PE, Pamplona LS, Nascimento GCR, Esteves RA, Pessoa OF, Silva CM. Effects of Internal Bleaching on the Adhesion of Glass-Fiber Posts. Open Dent J 2015; 9:375-9. [PMID: 26962369 PMCID: PMC4763955 DOI: 10.2174/1874210601509010375] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2015] [Revised: 09/11/2015] [Accepted: 09/29/2015] [Indexed: 12/04/2022] Open
Abstract
Objective: We evaluated the effects of internal bleaching on the adhesion of glass-fiber posts (GFPs) luted with different resin cements. Methods: Forty extracted human single-root teeth were endodontically treated and divided into four groups (n=10): G1- conventional resin cement (CRC); G2- self-adhesive resin cement (SARC); G3- bleaching + CRC; and G4- bleaching + SARC. Specimens were sectioned transversally into three slices to perform the push-out test at the coronal, middle and apical regions of the root canals. Data were analyzed using analysis of variance and Tukey's test (p<0.05). Results: The push-out bond strength of GFPs luted with SARC after bleaching (G4) was significantly lower than that of the other groups (p<0.001). We found no statistically significant differences in push-out bond strength among the other groups. Significance: Internal bleaching reduced the adhesion of GFPs luted with SARC. The adhesion of GFPs luted with CRC was not decreased after bleaching.
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Affiliation(s)
| | - Lucianne S Pamplona
- Department of Dentistry, School of Dentistry of Federal University of Pará, Belém, Pará, Brazil
| | - Gláucia C R Nascimento
- Department of Dentistry, School of Dentistry of Federal University of Pará, Belém, Pará, Brazil
| | - Renata A Esteves
- Department of Prosthodontics, School of Dentistry of Federal University of Pará, Belém, Pará, Brazil
| | - Oscar F Pessoa
- Department of Endodontics, School of Dentistry of Federal University of Pará, Belém, Pará, Brazil
| | - Cecy M Silva
- Department of Dentistry, School of Dentistry of Federal University of Pará, Belém, Pará, Brazil
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FERREIRA NDS, ROSA PCFD, FERREIRA RDIJ, VALERA MC. Evaluation of shear bond strength of orthodontic brackets bonded on the tooth surface after internal bleaching. REVISTA DE ODONTOLOGIA DA UNESP 2014. [DOI: 10.1590/rou.2014.033] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Introduction: There is great demand for esthetic treatment by patients who have discolored teeth, because currently aesthetic standards have become stricter and many patients have tooth bleaching procedures performed before or during orthodontic treatment. Objective: To evaluate the bonding of orthodontic brackets to human molars after internal tooth bleaching. Material and method: Forty molars were divided into four groups according to the bleaching agent used: PS) sodium perborate + water; PC) carbamide peroxide; PC + PS) carbamide peroxide + sodium perborate; Cont) water (control group). Bleaching agents placed inside the pulp chambers were replaced every 7 days for 2 weeks, and the brackets were bonded 30 days after the end of bleaching. The shear strength test was performed in a universal testing machine (Emic). Result: ANOVA with a significance level of 5% (p > 0.05), showed no statistically significant difference between groups (p = 0.1214). Conclusion: It was concluded that the different bleaching agents studied did not interfere with the bond strength of brackets to enamel and bonding the brackets 30 days after internal bleaching is a safe procedure.
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Gungor AY, Ozcan E, Alkis H, Turkkahraman H. Effects of different intracoronal bleaching methods on shear bond strengths of orthodontic brackets. Angle Orthod 2012; 82:942-946. [PMID: 22390632 PMCID: PMC8823113 DOI: 10.2319/111911-716.1] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2011] [Accepted: 01/01/2012] [Indexed: 09/02/2023] Open
Abstract
OBJECTIVE To evaluate the effects of different intracoronal bleaching methods on the shear bond strengths (SBS) of orthodontic brackets. MATERIALS AND METHODS Sixty freshly extracted mandibular incisors were randomly divided into four groups (n = 15 per group). After filling the root canals, root fillings were removed 2 mm apical to the cementoenamel junction, and a 2-mm-thick layer of zinc-phosphate cement base was applied. Group 1 served as the control. Intracoronal bleaching was performed with hydrogen peroxide (Opalacence Endo, Ultradent products Inc, South Jordan, Utah) in group 2, sodium perborate (Sultan Healthcare, Englewood, NJ) in group 3, and 37% carbamide peroxide (Whiteness Super Endo, Dentscare, ltda, Joinville, Brazil) in group 4. Orthodontic brackets were bonded with a light cure composite resin and cured with an LED light. After bonding, the SBS of the brackets was tested with a Universal testing machine. RESULTS Analysis of variance indicated a significant difference between groups (P < .001). The highest values for SBS were measured in group 1 (10.15 ± 1.15 MPa). The SBS was significantly lower in groups 2, 3, and 4 than in group 1 (P < .001). The lowest values for SBS were measured in group 3 (6.17 ± 0.85 MPa). SBS was significantly higher in group 4 than in group 3 (P < .05). CONCLUSIONS Intracoronal bleaching significantly affected the SBS of orthodontic brackets on human enamel. Bleaching with sodium perborate affects SBS more adversely than does bleaching with other agents.
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Affiliation(s)
- Ahmet Yalcin Gungor
- Department of Orthodontics, Faculty of Dentistry, University of Akdeniz, Antalya, Turkey.
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Martins MM, de Oliveira Almeida MA, Elias CN, de Moraes Mendes A. Bleaching effects on shear bond strengths of orthodontic brackets. Prog Orthod 2012; 13:23-9. [DOI: 10.1016/j.pio.2011.05.001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2011] [Revised: 05/19/2011] [Accepted: 05/26/2011] [Indexed: 11/29/2022] Open
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Toledano M, Yamauti M, Osorio E, Osorio R. Bleaching agents increase metalloproteinases-mediated collagen degradation in dentin. J Endod 2011; 37:1668-72. [PMID: 22099902 DOI: 10.1016/j.joen.2011.08.003] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2011] [Revised: 07/29/2011] [Accepted: 08/02/2011] [Indexed: 10/17/2022]
Abstract
INTRODUCTION Tooth bleaching is based on hydrogen peroxide application. The Objective of this study was to determine whether dental bleaching agents affect metalloproteinases-mediated dentin collagen degradation. METHODS Human dentin specimens were subjected to different treatments: (1) untreated dentin; (2) demineralization by 37% phosphoric acid (PA); (3) demineralization by 37% PA, followed by application of Single Bond (SB); (4) 2 immersions of 7 days each in a nonvital bleaching agent, followed by PA; (5) 2 immersions of 7 days each in nonvital bleaching, followed by PA and SB application; (6) 3 immersions by using in-office bleaching gel for 20 minutes; (7) 3 immersions by using in-office bleaching gel for 20 minutes plus activation with a light source; and (8) immersion in home bleaching gel for 8 hours per day during 3 weeks. Specimens were stored in artificial saliva. C-terminal telopeptide determinations (radioimmunoassay) were performed after 24 hours, 1 week, and 4 weeks. RESULTS Bleaching agents increased collagen degradation, but C-terminal telopeptide of type I collagen (ICTP) values were higher when dentin was PA-demineralized. Nonvital bleaching plus PA promoted the highest collagenolytic activity, which was reduced after SB infiltration. Halogen light application did not influence ICTP values. At 24 hours, home bleaching exhibited high collagenolytic activity, which decreased up to 4 weeks. After 4 weeks of storage, all bleaching procedures showed similar values of collagen degradation, which were not different from those of PA-demineralized and resin-infiltrated dentin. CONCLUSIONS All tested bleaching agents increase matrix metalloproteinases-mediated collagen degradation in dentin. This effect was not completely reverted after 4 weeks. Home bleaching induced the highest collagen degradation.
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Affiliation(s)
- Manuel Toledano
- Department of Dental Materials, School of Dentistry, University of Granada, Campus de Cartuja, Granada, Spain.
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UYSAL T, ERTAS H, SAGSEN B, BULUT H, ER O, USTDAL A. Can intra-coronally bleached teeth be bonded safely after antioxidant treatment? Dent Mater J 2010; 29:47-52. [DOI: 10.4012/dmj.2009-064] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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