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Küçük Ö, Keçeci AD. Strengthening effect of different fiber placement designs on root canal treated and bleached premolars. Odontology 2020; 109:349-357. [PMID: 32894381 DOI: 10.1007/s10266-020-00549-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2020] [Accepted: 08/20/2020] [Indexed: 10/23/2022]
Abstract
To evaluate the strengthening effect of five different fibers with different placement designs in root canal treated and intracoronally bleached premolars. Seventy extracted single-rooted premolars were distributed into 7 groups (G1-G7). Group 1 (G1) included the intact (I) teeth as the negative control. Group 2 (G2) included root canal treated, intra-coronally bleached and composite (C) restored teeth as the positive control. In the other five test groups after root canal treatment the teeth were intra-coronally bleached and fiber materials were placed into standard MOD cavities in the following different designs: an intracanal rigid fiber/Reforpost (G3,RF), an intracanal flexible fiber/ Everstick (G4, FF), four intracanal flexible pin fibers/Dentapreg Pin (G5,PF), an intercuspal flexible fiber /Dentapreg SFU (G6, IF) or an intra-coronal horseshoe-shaped/ Dentapreg SFU (G7,CF). All cavities were filled with a microfilled resin composite. Fracture resistance was tested using a universal testing machine under a crosshead speed of 1 mm/minute. One-way ANOVA and Duncan's Multiple Range tests were used for statistical analysis. Fracture types were recorded. The fracture resistance values in descending order were G1(I): 1190.97 N > G6 (IF): 1138.78 N > G5 (PF): 942.45 N > G3 (RF): 737.40 N > G4 (FF):694.29 N > G2 (C): 611.83 N > G7 (CF): 542.78 N. There were statistically significant differences among the groups (p ≤ 0.05). In all groups, repairable coronal oblique fractures were mostly observed. Flexible fibers placed intercuspally exhibited a significantly better strengthening effect than those of the intracanal flexible and rigid fibers (p < 0.05).
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Affiliation(s)
- Öznur Küçük
- Kütahya Oral and Dental Health Center, Kütahya, Turkey.
| | - Ayşe Diljin Keçeci
- Department of Endodontics, School of Dentistry, Suleyman Demirel University, Isparta, Turkey.
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2
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Branco AC, Ribeiro N, Figueiredo-Pina CG, Colaço R, Serro AP. Characterization of the Nanostructure of Collagen Fibers Following the Application of Dilute Hydrogen Peroxide used in Dental Whitening Treatments. ANAL LETT 2019. [DOI: 10.1080/00032719.2019.1668946] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
- A. C. Branco
- Centro de Química Estrutural (CQE), Instituto Superior Técnico, Universidade de Lisboa, Lisboa, Portugal
- Centro de Desenvolvimento de Produto e Transferência de Tecnologia (CDP2T), Escola Superior de Tecnologia de Setúbal, Instituto Politécnico de Setúbal, Setúbal, Portugal
| | - N. Ribeiro
- Centro de Química Estrutural (CQE), Instituto Superior Técnico, Universidade de Lisboa, Lisboa, Portugal
| | - C. G. Figueiredo-Pina
- Centro de Desenvolvimento de Produto e Transferência de Tecnologia (CDP2T), Escola Superior de Tecnologia de Setúbal, Instituto Politécnico de Setúbal, Setúbal, Portugal
- Centro de Investigação Interdisciplinar Egas Moniz (CiiEM), Instituto Universitário Egas Moniz, Monte de Caparica, Portugal
- Centro de Física e Engenharia de Materiais Avançados (CeFEMA), Instituto Superior Técnico, Universidade de Lisboa, Lisboa, Portugal
| | - R. Colaço
- Instituto de Engenharia Mecânica (IDMEC) and Departamento de Engenharia Mecânica, Instituto Superior Técnico, Universidade de Lisboa, Lisboa, Portugal
| | - A. P. Serro
- Centro de Química Estrutural (CQE), Instituto Superior Técnico, Universidade de Lisboa, Lisboa, Portugal
- Centro de Investigação Interdisciplinar Egas Moniz (CiiEM), Instituto Universitário Egas Moniz, Monte de Caparica, Portugal
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Llena C, Esteve I, Rodríguez-Lozano FJ, Forner L. The application of casein phosphopeptide and amorphous calcium phosphate with fluoride (CPP-ACPF) for restoring mineral loss after dental bleaching with hydrogen or carbamide peroxide: An in vitro study. Ann Anat 2019; 225:48-53. [DOI: 10.1016/j.aanat.2019.05.005] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2018] [Revised: 05/06/2019] [Accepted: 05/06/2019] [Indexed: 10/26/2022]
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4
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Nascimento GCR, Ribeiro MES, Guerreiro MYR, de Souza Cruz EL, Pinheiro JDJV, Loretto SC. Effect of sodium ascorbate on bond strength and metalloproteinases activity in bleached dentin. Clin Cosmet Investig Dent 2019; 11:259-265. [PMID: 31692502 PMCID: PMC6708398 DOI: 10.2147/ccide.s209278] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2019] [Accepted: 05/23/2019] [Indexed: 11/29/2022] Open
Abstract
Aim This study evaluated the effect of sodium ascorbate (SA) on the proteolytic activity of matrix metalloproteinases (MMPs) and investigated the related effects on the bond strength of bleached dentin. Materials and methods Eighty freshly extracted human third molars were randomly divided according to treatment (bleaching or SA application), type of analysis (microshear or measuring MMP activity), and post-bleaching time to assess bond strength (24 hrs or 30 days). Data from both analyses were subjected to one-way analysis of variance to detect differences among groups, followed by Tukey’s multiple comparison test (p≤0.05). Results Dental bleaching significantly reduced bond strength values when the adhesive strategy was performed after 24 hrs (despite the SA treatment) or 30 days after the bleaching procedure. However, after 30 days, the bond strength values of the groups who received bleaching or SA application were similar to those of the unbleached group. Dental bleaching caused the activation of MMPs, and SA did not influence this activity. Conclusion It was concluded that SA does not affect the activity of MMPs or the bond strength in bleached dentin immediately after the bleaching treatment.
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Affiliation(s)
- Gláucia Cristina Rodrigues Nascimento
- Dental Materials Laboratory of the Postgraduate Program in Dentistry, Institute of Health Sciences, School of Dental, Federal University of Pará, Belém, Pará, Brazil
| | - Mara Eliane Soares Ribeiro
- Dental Materials Laboratory of the Postgraduate Program in Dentistry, Institute of Health Sciences, School of Dental, Federal University of Pará, Belém, Pará, Brazil
| | - Marcella Yasmin Reis Guerreiro
- Dental Materials Laboratory of the Postgraduate Program in Dentistry, Institute of Health Sciences, School of Dental, Federal University of Pará, Belém, Pará, Brazil
| | | | | | - Sandro Cordeiro Loretto
- Dental Materials Laboratory of the Postgraduate Program in Dentistry, Institute of Health Sciences, School of Dental, Federal University of Pará, Belém, Pará, Brazil
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Karaarslan ES, Özmen ZC, Aytac F, Bicakci AA, Buldur M, Aydogan L, Hologlu F, Özkocak B. Evaluation of biochemical changes in dental tissues after different office bleaching methods. Hum Exp Toxicol 2018; 38:389-397. [PMID: 30526070 DOI: 10.1177/0960327118817103] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The color of the teeth is an important topic for many people and can be influenced by intrinsic and extrinsic stains. There is an increasing demand for whitening of the teeth year by year. The most popular way of whitening is "bleaching," which is the result of the breakdown of pigments located in the enamel and/or the dentin, caused by reactive oxygen species (ROS) released from bleaching agents. These bleaching agents could increase matrix metalloproteinase (MMP)-mediated collagen degradation in dentin. The aim of this study was to compare biochemical changes and oxidative stress levels of the human premolar dentin-pulp complex after three different bleaching methods containing hydrogen peroxide (H2O2) bleaching agents. Individuals, whose first four premolars were extracted for orthodontic purposes, included into the study. Group 1-Laser: bleaching gel containing 46% H2O2 (LaserWhite20 whitening gel, Biolase Technology Inc., San Clemente, CA, USA) and a diode laser activation (Ezlase 940 nm system). Group 2: 35% H2O2 containing whitening gel (Whiteness HP Maxx, FGM) and halogen light source activation (Optilux 501, Kerr, Orange, CA, USA). Group 3: 35% H2O2 containing whitening gel (Whiteness HP Maxx, FGM). Group 4-Control: No whitening treatment. According to the test results, there were no significant differences among groups in the values of cathepsin B and MMP proteolytic activities ( p > 0.05). The total ROS values released from the dentin tissue were higher than those obtained from the pulp tissue ( p < 0.05). There were significant differences among the bleaching groups in the ROS values released from the dentin tissue.
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Affiliation(s)
- E S Karaarslan
- 1 Department of Restorative Dentistry, Faculty of Dentistry, Gaziosmanpaşa University, Tokat, Turkey
| | - Z C Özmen
- 2 Department of Biochemistry, Faculty of Medicine, Gaziosmanpaşa University, Tokat, Turkey
| | - F Aytac
- 3 Department of Restorative Dentistry, Faculty of Dentistry, Abant Izzet Baysal University, Bolu, Turkey
| | - A A Bicakci
- 4 Department of Orthodontics, Faculty of Dentistry, Gaziosmanpaşa University, Tokat, Turkey
| | - M Buldur
- 1 Department of Restorative Dentistry, Faculty of Dentistry, Gaziosmanpaşa University, Tokat, Turkey
| | - L Aydogan
- 2 Department of Biochemistry, Faculty of Medicine, Gaziosmanpaşa University, Tokat, Turkey
| | - F Hologlu
- 4 Department of Orthodontics, Faculty of Dentistry, Gaziosmanpaşa University, Tokat, Turkey
| | - Bbc Özkocak
- 3 Department of Restorative Dentistry, Faculty of Dentistry, Abant Izzet Baysal University, Bolu, Turkey
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Llena C, Esteve I, Forner L. Effects of in-office bleaching on human enamel and dentin. Morphological and mineral changes. Ann Anat 2018. [PMID: 29522885 DOI: 10.1016/j.aanat.2018.01.003] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
BACKGROUND The effects of HP-based products upon dental enamel and dentin are inconclusive. AIM To evaluate changes in micromorphology and composition of calcium (Ca) and phosphate (P) in enamel and dentin after the application of 37.5% hydrogen peroxide (HP) and 35% carbamide peroxide (CP) METHODS: Crowns of 20 human teeth were divided in two halves. One half was used as control specimen and the other as experimental specimen. The control specimens were kept in artificial saliva, and the experimental specimens were divided into four groups (n=5 each): group 1 (enamel HP for 45min); group 2 (dentin HP for 45min); group 3 (enamel CP for 90min); and group 4 (dentin CP for 90min). The morphological changes were evaluated using confocal laser scanning microscopy (CLSM), while the changes in the composition of Ca and P were assessed using environmental scanning electron microscopy combined with a microanalysis system (ESEM+EDX). The results within each group and between groups were compared using the Wilcoxon test and Mann-Whitney U-test, respectively (p<0.05). RESULTS Similar morphological changes in the enamel and no changes in dentin were assessed with both products. Ca and P decreased in enamel and dentin, without significant differences between them or with respect to their control specimens (p>0.05). CONCLUSIONS When bleaching products with a neutral pH are used in clinical practice, both, the concentration and the application time should be taken into account in order to avoid possible structural and mineral changes in enamel and dentin.
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Affiliation(s)
- Carmen Llena
- Department of Stomatology, Universitat de València, Clínica Odontológica, C. Gascó Oliag, 1, 46010 Valencia, Spain.
| | - Irene Esteve
- Department of Stomatology, Universitat de València, Clínica Odontológica, C. Gascó Oliag, 1, 46010 Valencia, Spain
| | - Leopoldo Forner
- Department of Stomatology, Universitat de València, Clínica Odontológica, C. Gascó Oliag, 1, 46010 Valencia, Spain
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Llena C, Esteve I, Forner L. Effect of Hydrogen and Carbamide Peroxide in Bleaching, Enamel Morphology, and Mineral Composition: In vitro Study. J Contemp Dent Pract 2017; 18:576-582. [PMID: 28713111 DOI: 10.5005/jp-journals-10024-2087] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
AIM The aim of the study was to evaluate the bleaching effect, morphological changes, and variations in calcium (Ca) and phosphate (P) in the enamel with hydrogen peroxide (HP) and carbamide peroxide (CP) after the use of different application regimens. MATERIALS AND METHODS Four groups of five teeth were randomly assigned, according to the treatment protocol: HP 37.5% applied for 30 or 60 minutes (HP30, HP60), CP 16% applied for 14 or 28 hours (CP14, CP28). Changes in dental color were evaluated, according to the following formula: ΔE = [(La-Lb)2+(aa-ab)2 + (ba-bb)2]1/2. Enamel morphology and Ca and P compositions were evaluated by confocal laser scanning microscope and environmental scanning electron microscopy. RESULTS ΔE HP30 was significantly greater than CP14 (10.37 ± 2.65/8.56 ± 1.40), but not between HP60 and CP28. HP60 shows greater morphological changes than HP30. No morphological changes were observed in the groups treated with CP. The reduction in Ca and P was significantly greater in HP60 than in CP28 (p < 0.05). CONCLUSION Both formulations improved tooth color; HP produced morphological changes and Ca and P a gradual decrease, while CP produced no morphological changes, and the decrease in mineral component was smaller. CLINICAL SIGNIFICANCE CP 16% applied during 2 weeks could be equally effective and safer for tooth whitening than to administer two treatment sessions with HP 37.5%.
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Affiliation(s)
- Carmen Llena
- Department of Stomatology, Universitat de Valencia, Valencia Spain, Phone: +34963864175, e-mail:
| | - Irene Esteve
- Department of Stomatology, Universitat de Valencia, Valencia Spain
| | - Leopoldo Forner
- Department of Stomatology, Universitat de Valencia, Valencia Spain
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Effect of tooth whitening strips on fatigue resistance and flexural strength of bovine dentin in vitro. PLoS One 2017; 12:e0173480. [PMID: 28278191 PMCID: PMC5344512 DOI: 10.1371/journal.pone.0173480] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2016] [Accepted: 02/21/2017] [Indexed: 11/23/2022] Open
Abstract
Objective To determine the effects of whitening strips on bovine dentin fatigue resistance and flexural strength in vitro. Materials and methods A total of eighty bovine dentin specimens (2x2x17mm) were treated with either: control glycerine gel on plastic film wrap or whitening strips containing 9.5% hydrogen peroxide. Treatment was applied for 30 minutes, twice a day, for 1- or 4-weeks. After the last treatment, ten specimens per group were randomly selected to undergo fatigue testing (106 cycles, 3Hz, 20N) while the other ten were subjected to flexural strength testing after ten days of storage in artificial saliva. Kaplan-Meier method with a log rank test, Wilcoxon test and Cox regression were used to assess fatigue test results (p<0.05). One-way ANOVA and Tukey’s tests were used to compare the flexural strength results (p<0.05). Results There were significant differences in survival during the fatigue test among the groups (p<0.001). Treatment (control or bleach) was a significant factor for specimen survival (p<0.001, Exp(B) = 33.45). There were significant differences in mean flexural strength (p<0.001). No significant difference was found between “1-wk control” and “4-wk control”. The mean flexural strength and fatigue resistance of the “4-wk bleach” were significantly lower than all the other groups. Conclusions The use of whitening strips reduced the fatigue resistance and flexural strength of bovine dentin in vitro. Until the effect of whitening strips on mechanical properties of human dentin is fully elucidated, it remains prudent to advise patients to avoid excessive direct use of whitening strips on dentin.
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9
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Gugutkov D, Gustavsson J, Cantini M, Salmeron-Sánchez M, Altankov G. Electrospun fibrinogen-PLA nanofibres for vascular tissue engineering. J Tissue Eng Regen Med 2016; 11:2774-2784. [DOI: 10.1002/term.2172] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2015] [Revised: 01/22/2016] [Accepted: 02/15/2016] [Indexed: 01/04/2023]
Affiliation(s)
- D. Gugutkov
- Institute for Bioengineering of Catalonia (IBEC); Barcelona Spain
| | - J. Gustavsson
- Institute for Bioengineering of Catalonia (IBEC); Barcelona Spain
| | - M. Cantini
- Division of Biomedical Engineering; School of Engineering, University of Glasgow; UK
| | - M. Salmeron-Sánchez
- Division of Biomedical Engineering; School of Engineering, University of Glasgow; UK
| | - G. Altankov
- Institute for Bioengineering of Catalonia (IBEC); Barcelona Spain
- Centro de Investigación Biomédica en Red en Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN); Zaragoza Spain
- Institucio Catalana de Recerca i Estudis Avançats (ICREA); Barcelona Spain
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10
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Tam LE, Cho W, Wang BY, De Souza G. Effect of Bleaching Treatment on Fatigue Resistance and Flexural Strength of Bovine Dentin. J ESTHET RESTOR DENT 2015; 27:374-82. [DOI: 10.1111/jerd.12157] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Laura E. Tam
- Restorative Dentistry; Department of Clinical Sciences; Faculty of Dentistry; University of Toronto; Toronto Canada
| | - Woohyun Cho
- Restorative Dentistry; Department of Clinical Sciences; Faculty of Dentistry; University of Toronto; Toronto Canada
| | - Bridget Y. Wang
- Restorative Dentistry; Department of Clinical Sciences; Faculty of Dentistry; University of Toronto; Toronto Canada
| | - Grace De Souza
- Restorative Dentistry; Department of Clinical Sciences; Faculty of Dentistry; University of Toronto; Toronto Canada
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Can Sağlam B, Görgül G. Evaluation of surface alterations in different retreatment nickel-titanium files: AFM and SEM study. Microsc Res Tech 2015; 78:356-62. [PMID: 25736462 DOI: 10.1002/jemt.22481] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2014] [Accepted: 02/10/2015] [Indexed: 11/10/2022]
Abstract
The aim of this study was to evaluate the surface changes of nickel titanium (Ni-Ti) rotary retreatment files after three and five uses. Furthermore, the effects of 2% sodium hypochlorite and chloroform solutions and sterilization procedures on the NiTi rotary retreatment surfaces were investigated. ProTaper Retreatment files, R-endo files, and Mtwo retreatment files were used for this study. The palatinal roots of maxillary molar teeth were obturated with gutta percha and Ah26. Retreatment procedures were performed with these retreatment file systems. The surface changes of untreated NiTi rotary files that were used three and five times, immersed in NaOCl and chloroform and subjected to sterilization procedures were investigated with atomic force microscopy (AFM) and scanning electron microscopy (SEM). The RMS values, three dimensional images and SEM images at various magnifications were obtained. RMS values showed that all three NiTi rotary retreatment file systems showed significant deteriorations after three and five uses. Cracks, damages and spiral construction deteriorations were detected in the SEM images after three and five uses. Furthermore, the Mtwo 15 file was broken off after five uses. AFM data indicated that 2% NaOCl caused significant surface deteriorations on NiTi rotary files and both AFM and SEM evaluation showed that chloroform solution and sterilization procedures did not cause significant surface deteriorations. In conclusion, ProTaper retreatment, R-endo, and Mtwo retreatment files showed surface damages depending on retreatment procedures. Clinicians have to consider that retreatment files always have a tendency to break off after the third time they have been used.
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Affiliation(s)
- Baran Can Sağlam
- Department of Endodontics, Faculty of Dentistry, Bülent Ecevit University, Zonguldak, Turkey
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12
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Briso ALF, Rahal V, Sundfeld RH, Santos PHD, Alexandre RS. Effect of Sodium Ascorbate on Dentin Bonding After Two Bleaching Techniques. Oper Dent 2014; 39:195-203. [DOI: 10.2341/12-054-l] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
SUMMARY
The purpose of this study was to analyze the influence of 10% sodium ascorbate (SA) on the hybrid layer, resin tag length, and bond strength to dentin after bleaching. Six groups were tested: G C, control; G SA, sodium ascorbate (SA) + restoration; G CP, bleaching with carbamide peroxide (CP) + restoration; G CP+SA, bleaching with CP + SA+ restoration; G HP, bleaching with 35% hydrogen peroxide (HP) + restoration; and G HP+SA, HP + SA + restoration. After dental bleaching, the dentin was exposed and the antioxidant solution was applied to groups G SA, G CP+SA, and G HP+SA, before bonding procedures. The teeth were sectioned in the mesiodistal direction. One section was decalcified, and the specimens were embedded in paraffin and sectioned in the longitudinal direction with a thickness of 6 μm. Fifteen slices of each specimen were selected according to a systematic sample of slices with an interval proportional to the total number of slices obtained for each tooth. The specimens were stained using the Brown & Brenn method, and an optic microscope was used to analyze the hybrid layer thickness and resin tag length. The remaining tooth segment was sectioned into stick-shaped specimens and used for microtensile bond strength testing (0.5 mm/min). Statistical analysis was performed using two-way analysis of variance and Fisher test. The results for hybrid layer + tag formation (in micrometers) were G C, 13.27 Aa; G SA, 11.85 Ba; G CP, 6.84 Bb; G CP+SA, 9.02 Ab; G HP, 7.28 Bb; and G HP+SA, 9.22 Ab; bond strength results (in MPa) were G C, 49.5 Aa; G SA, 51.7 Aa; G CP, 37.16 Bb; G CP+SA, 47.69 Aa; G HP, 32.39 Ab; and G HP+SA, 39.67 Ab. Tooth bleaching with CP or HP impairs the formation of the hybrid layer and resin tags and reduces the microtensile bond strength. Statistically, the use of SA significantly increases the hybrid layer thickness and resin tag length. The microtensile bond strength values for carbamide peroxide increased, but the microtensile bond strength for hydrogen peroxide was not affected.
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Affiliation(s)
- ALF Briso
- André LF Briso, DDS, MS, PhD, associate professor, Araçatuba Dental School, UNESP-Univ Estadual Paulista, Restorative Dentistry, Araçatuba, Brazil
| | - V Rahal
- Vanessa Rahal, DDS, MS, PhDc, Araçatuba Dental School, UNESP-Univ Estadual Paulista, Restorative Dentistry, Araçatuba, Brazil
| | - RH Sundfeld
- Renato Herman Sundfeld, DDS, MS, PhD, associate professor, Araçatuba Dental School, UNESP-Univ Estadual Paulista, Restorative Dentistry, Araçatuba, Brazil
| | - PH dos Santos
- Paulo Henrique dos Santos, DDS, MS, PhD, associate professor, Araçatuba Dental School, UNESP-Univ Estadual Paulista, Dental Materials and Prosthodontics, Araçatuba, Brazil
| | - RS Alexandre
- Rodrigo Sversut Alexandre, DDS, MS, PhD, research collaborator, Araçatuba Dental School, UNESP-Univ Estadual Paulista, Restorative Dentistry, Araçatuba, Brazil
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13
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Barón M, Llena C, Forner L, Palomares M, González-García C, Salmerón-Sánchez M. Nanostructural changes in dentine caused by endodontic irrigants. Med Oral Patol Oral Cir Bucal 2013; 18:e733-6. [PMID: 23524430 PMCID: PMC3731106 DOI: 10.4317/medoral.18713] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2012] [Accepted: 12/08/2012] [Indexed: 11/05/2022] Open
Abstract
OBJECTIVE To study nanostructural dentinal changes produced by endodontic irrigants. STUDY DESIGN Experimental study. Nanoindentations were performed on peritubular (PD) and intertubular dentine (ID) with an atomic force microscopy. Stiffness and adhesion force were determined before and after application of 5.25% sodium hypochlorite (NaOCl) and 17% ethylenediaminetetraacetic acid (EDTA). Normalized differences before and after treatment for stiffness and adhesion forces were calculated. A paired T-test was used to compare stiffness and adhesion force before and after irrigants application. RESULTS After treatment with EDTA there was a 29.80% reduction in stiffness in ID and a 63.53% reduction in PD. Adhesion force was reduced by 21.22% and 8.21% respectively. After treatment with 5.25% NaOCI stiffness was reduced by 2.49% in ID and increased by 15.01% in PD. Adhesion force increased by 25.11% and 23.97% respectively. CONCLUSIONS 17% EDTA reduced stiffness and adhesion force in ID and PD. Treatment with NaOCI at 5.25% had no significant effect on stiffness but did affect adhesion force in ID and PD.
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Affiliation(s)
- Marta Barón
- Department of Stomatology, Universitat de València, Valencia, Spain
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Sato C, Rodrigues FA, Garcia DM, Vidal CMP, Pashley DH, Tjäderhane L, Carrilho MR, Nascimento FD, Tersariol ILS. Tooth bleaching increases dentinal protease activity. J Dent Res 2012; 92:187-92. [PMID: 23242228 DOI: 10.1177/0022034512470831] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Hydrogen peroxide is an oxidative agent commonly used for dental bleaching procedures. The structural and biochemical responses of enamel, dentin, and pulp tissues to the in vivo bleaching of human (n = 20) premolars were investigated in this study. Atomic force microscopy (AFM) was used to observe enamel nanostructure. The chemical composition of enamel and dentin was analyzed by infrared spectroscopy (FTIR). The enzymatic activities of dental cathepsin B and matrix metalloproteinases (MMPs) were monitored with fluorogenic substrates. The amount of collagen in dentin was measured by emission of collagen autofluorescence with confocal fluorescence microscopy. The presence of Reactive Oxygen Species (ROS) in the pulp was evaluated with a fluorogenic 2',7'-dichlorodihydrofluorescein diacetate (DCFDA) probe. Vital bleaching of teeth significantly altered all tested parameters: AFM images revealed a corrosion of surface enamel nanostructure; FTIR analysis showed a loss of carbonate and proteins from enamel and dentin, along with an increase in the proteolytic activity of cathepsin-B and MMPs; and there was a reduction in the autofluorescence of collagen and an increase in both cathepsin-B activity and ROS in pulp tissues. Together, these results indicate that 35% hydrogen peroxide used in clinical bleaching protocols dramatically alters the structural and biochemical properties of dental hard and soft pulp tissue.
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Affiliation(s)
- C Sato
- Centro Interdisciplinar de Investigação Bioquímica, UMC, Mogi das Cruzes, Brazil
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15
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Nanomechanical Properties of Endodontically Treated Teeth. J Endod 2011; 37:1562-5. [DOI: 10.1016/j.joen.2011.08.006] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2011] [Revised: 07/21/2011] [Accepted: 08/02/2011] [Indexed: 11/22/2022]
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