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Serbanoiu DC, Vartolomei AC, Ghiga DV, Pop SI, Panainte I, Moldovan M, Sarosi C, Petean I, Boileau MJ, Pacurar M. Comparative Evaluation of Dental Enamel Microhardness Following Various Methods of Interproximal Reduction: A Vickers Hardness Tester Investigation. Biomedicines 2024; 12:1132. [PMID: 38791094 PMCID: PMC11118204 DOI: 10.3390/biomedicines12051132] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2024] [Revised: 05/14/2024] [Accepted: 05/15/2024] [Indexed: 05/26/2024] Open
Abstract
Interproximal enamel reduction, also known as stripping, is a common orthodontic procedure that reduces the mesiodistal diameter of teeth, allowing for a balance of available space in dental arches. The aim of this study was to assess the enamel surface microhardness resulting from the application of currently available methods for interproximal reduction. Forty-two extracted human permanent teeth were divided into six different groups, each subjected to a therapeutic stripping procedure using various methods (i.e., diamond burs, abrasive strips of 90 μm, 60 μm, 40 μm, and 15 μm, and abrasive discs). Stripping was performed by a single individual in accordance with the manufacturers' recommendations for the various systems used. One of the proximal faces of the tooth underwent IPR, while the other side remained untreated for control. The hardness of the enamel surface was measured using a Vickers hardness tester. The control group achieved the hardest enamel surface (354.4 ± 41.02 HV1), while the lowest was observed for enamel surfaces treated with 90 µm abrasive strips (213.7 ± 118.6). The only statistically significant difference was identified in comparisons between the values measured for the control group and those obtained after stripping with diamond burs (p = 0.0159). Enamel microhardness varied depending on the stripping instrument used, but no statistically significant differences were found (p > 0.05). Optimal microhardness values, close to those of healthy enamel, were achieved after mechanical treatment with 15 µm abrasive strips and abrasive discs. Dental stripping is a safe therapeutic procedure that has a relatively minor influence on the microhardness of surface enamel.
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Affiliation(s)
- Dan-Cosmin Serbanoiu
- Faculty of Dental Medicine, GEP University of Medicine Pharmacy, Science and Technology of Targu Mures, 540139 Târgu Mures, Romania; (D.-C.S.); (A.-C.V.); (D.-V.G.); (I.P.); (M.P.)
| | - Aurel-Claudiu Vartolomei
- Faculty of Dental Medicine, GEP University of Medicine Pharmacy, Science and Technology of Targu Mures, 540139 Târgu Mures, Romania; (D.-C.S.); (A.-C.V.); (D.-V.G.); (I.P.); (M.P.)
| | - Dana-Valentina Ghiga
- Faculty of Dental Medicine, GEP University of Medicine Pharmacy, Science and Technology of Targu Mures, 540139 Târgu Mures, Romania; (D.-C.S.); (A.-C.V.); (D.-V.G.); (I.P.); (M.P.)
| | - Silvia Izabella Pop
- Faculty of Dental Medicine, GEP University of Medicine Pharmacy, Science and Technology of Targu Mures, 540139 Târgu Mures, Romania; (D.-C.S.); (A.-C.V.); (D.-V.G.); (I.P.); (M.P.)
| | - Irinel Panainte
- Faculty of Dental Medicine, GEP University of Medicine Pharmacy, Science and Technology of Targu Mures, 540139 Târgu Mures, Romania; (D.-C.S.); (A.-C.V.); (D.-V.G.); (I.P.); (M.P.)
| | - Marioara Moldovan
- Raluca Ripan Chemistry Research Institute, Babes-Bolyai University, 400294 Cluj-Napoca, Romania; (M.M.); (C.S.)
| | - Codruta Sarosi
- Raluca Ripan Chemistry Research Institute, Babes-Bolyai University, 400294 Cluj-Napoca, Romania; (M.M.); (C.S.)
| | - Ioan Petean
- Faculty of Chemistry and Chemical Engineering, Babes-Bolyai University, 400084 Cluj-Napoca, Romania;
| | - Marie-Jose Boileau
- Faculty of Dental Medicine, Bordeaux University, CEDEX, 33076 Bordeaux, France;
| | - Mariana Pacurar
- Faculty of Dental Medicine, GEP University of Medicine Pharmacy, Science and Technology of Targu Mures, 540139 Târgu Mures, Romania; (D.-C.S.); (A.-C.V.); (D.-V.G.); (I.P.); (M.P.)
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Mawlood AA, Hamasaeed NH. The impact of the diode laser 940 nm photoactivated bleaching on color change of different composite resin restorations. J Adv Pharm Technol Res 2023; 14:155-160. [PMID: 37255881 PMCID: PMC10226697 DOI: 10.4103/japtr.japtr_45_23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2023] [Revised: 02/24/2023] [Accepted: 02/25/2023] [Indexed: 06/01/2023] Open
Abstract
The study's main objective was to evaluate as well as compare the impact of diode laser 940 nm and conventional in-office bleaching technique on the color change of different composite resin restorations. A total of ninety composite resin discs (CRDs) were made from Filtek™ Bulk Fill, nanohybrid composite resin Filtek™ Z550 XT Universal Restorative, and flowable composite resin restoration Filtek™ Z350xt Flowable Composite. Group A: (30) CRD for Filtek™ Bulk Fill, group B: (30) CRD for Filtek™ Z550 XT Universal Restorative, and group C: (30) CRD for Filtek™ Z350xt Flowable Composite. A1, B1, and C1: (10 CRD in each group): Control group without bleaching. A2, B2, and C2: 10 CRD in each group bleached with Laser White20 without laser activation. A3, B3, and C3: 10 CRD in each group bleached with Laser White20 and activated by diode laser 940 nm. The color was evaluated using a dental spectrophotometer. One-way ANOVA was utilized for the comparison of the color stability of the CRD. P < 0.05 is regarded as statically significant. Both conventional and diode laser in-office vital tooth bleaching protocols affected the color stability of composite resin restorations. The result demonstrated that bleaching without laser activation produced color change (mean [8.30], standard deviation [SD] (1.95) P [< 0.001]), whereas the bleaching and activation by diode laser produced color change (mean [8.11], SD [1.99], P [< 0.001]). Both types of bleaching protocol affected composite resin restorations' color stability. In all tested materials, color changes after the bleaching protocol were clinically perceptible. The restorations following the bleaching procedure are required to be replaced by clinicians.
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Affiliation(s)
- Amal Alaa Mawlood
- Department of Conservative Dentistry, College of Dentistry, Hawler Medical University, Erbil, Iraq
| | - Niaz H. Hamasaeed
- Department of Conservative Dentistry, College of Dentistry, Hawler Medical University, Erbil, Iraq
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Moradi Z, Valizadeh S, Farhadi E, Asadollahi Y, Noroozian M, Chiniforush N. Microhardness change of human dental enamel due to power bleaching with different gels. Folia Med (Plovdiv) 2022; 64:961-968. [PMID: 36876555 DOI: 10.3897/folmed.64.e68223] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2021] [Accepted: 11/04/2021] [Indexed: 01/01/2023] Open
Abstract
AIM Since the introduction of bleaching treatments in the office, different lights have been suggested to accelerate the bleaching reaction. This study aimed to evaluate the microhardness of tooth enamel after office bleaching using different materials.
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Shakibafard M, Ezoji F, Esmaeili B, Bijani A. Evaluation of the effects of different concentrations of bleaching agents on flexural strength and microhardness of VITA ENAMIC. Dent Res J (Isfahan) 2022; 19:32. [PMID: 35669608 PMCID: PMC9164944] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2020] [Revised: 10/18/2021] [Accepted: 12/07/2021] [Indexed: 12/04/2022] Open
Abstract
Background Considering the studies on the effects of bleaching materials on properties of dental materials, The aims of this in vitro study were to evaluate the effects of two different concentrations of bleaching agents on flexural strength and microhardness of VITA ENAMIC. Materials and Methods In this experimental in vitro study, 30 rectangular-shaped specimens (2 mm width × 2 mm height × 12 mm length) for flexural strength and 30 specimens (5 mm width × 5 mm length × 2 mm height) for microhardness tests were prepared from VITA ENAMIC blocks 12 × 14 × 18 mm. The specimens were polished using silicon-carbide sandpapers 400, 600, 800, 1200, 2000 under flow of water for 60 s each. The prepared samples for flexural strength and microhardness were divided into 3 subgroups (n = 10): control group (C), samples bleached using Opalescence PF 15% (B15), and samples bleached with Opalescence Xtra Boost 40% (B40). Flexural strength measurement was done using a universal testing machine, and microhardness test was done using Vickers. Data were analyzed using analysis of variance and post hoc tests and P < 0.05 was considered significant. Results The mean microhardness values of C, B15, and B40 groups were 255.46 ± 3.02, 249.86 ± 4.18, and 235.53 ± 4.61 kgf/mm2. Opalescence PF 15% and Opalescence Xtra Boost 40% affected microhardness of ENAMIC significantly (P < 0.05). The mean flexural strength values of C, B15, and B40 groups were 155.26 ± 16.13, 142.14 ± 11.52, and 133.39 ± 16.13 MPa. A significant decrease in flexural strength was found between the C and B40 groups (P = 0.007). However, the difference between flexural strength of the C and B15 groups was not significant (P > 0.05). Conclusion Our study showed that both concentrations of bleaching agents can affect microhardness of ENAMIC. Moreover, hydrogen peroxide 40% has a negative effect on the flexural strength of ENAMIC.
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Affiliation(s)
| | - Fariba Ezoji
- Dental Materials Research Center, Health Research Institute, Babol University of Medical Sciences, Babol, Iran
| | - Behnaz Esmaeili
- Dental Materials Research Center, Health Research Institute, Babol University of Medical Sciences, Babol, Iran,Address for correspondence: Dr. Behnaz Esmaeili, Department of Restorative Dentistry, Faculty of Dentistry, Babol University of Medical Sciences, Babol, Iran. E-mail:
| | - Ali Bijani
- Social Determinants of Health Center, Health Research Institute, Babol University of Medical Sciences, Babol, Iran
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Esmaeili B, Shakibafard M, Ezoji F, Bijani A. Evaluation of the effects of different concentrations of bleaching agents on flexural strength and microhardness of VITA ENAMIC. Dent Res J (Isfahan) 2022. [DOI: 10.4103/1735-3327.344155] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
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Mohammadi N, Kimyai S, Ghavami Lahij Y, Bahari M, Ajami AA, Abed Kahnamouei M, Daneshpooy M. Comparison of the effect of bleaching with 15% carbamide peroxide and 35% hydrogen peroxide on flexural strength of Cention N in selfcured and dual-cured polymerization modes. J Dent Res Dent Clin Dent Prospects 2020; 14:105-109. [PMID: 32908651 PMCID: PMC7464230 DOI: 10.34172/joddd.2020.023] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2019] [Accepted: 02/23/2020] [Indexed: 11/09/2022] Open
Abstract
Background. The use of bleaching agents might result in microstructural changes in tooth structure and in restorative materials. This study compared the effects of bleaching with %15 carbamide peroxide and %35 hydrogen peroxide on the flexural strength of Cention N restorative material using the self-cured and dual-cured polymerization modes. Methods. Sixty bar-shaped samples of Cention N restorative material were included in this in vitro study and assigned to three groups (n=20) randomly: control, bleaching with %15 carbamide peroxide and bleaching with %35 hydrogen peroxide. Each group was divided into two subgroups: samples polymerized in the self-cured mode and samples polymerized in the dual-cured mode. Then the flexurals trengths of the samples were determined. Two-way ANOVA was used to compare flexural strengths between the three groups in two polymerization modes, followed by post hoc Tukey test. Statisticals ignificance was defined at P<0.05. Results. The difference in the mean flexural strength was significant in terms of the bleaching regimen (P<0.001), with significantly lower flexural strength in the two bleaching groups compared to the control group. However, the mean flexural strengths were not significantly different in terms of the polymerization mode applied (P=0.14). Conclusion. The application of %15 carbamide peroxide and %35 hydrogen peroxide bleaching agents decreased the flexural strength of Cention N restorative material. Irrespective of the bleaching regimen, there was no significant difference in the flexural strength of Cention N between the self-curing and dual-curing polymerization modes.
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Affiliation(s)
- Narmin Mohammadi
- Dental and Periodontal Research Center, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran.,Department of Operative Dentistry, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Soodabeh Kimyai
- Dental and Periodontal Research Center, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran.,Department of Operative Dentistry, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Yasaman Ghavami Lahij
- Department of Operative Dentistry, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Mahmoud Bahari
- Department of Operative Dentistry, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Amir Ahmad Ajami
- Department of Operative Dentistry, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Mahdi Abed Kahnamouei
- Department of Operative Dentistry, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Mehdi Daneshpooy
- Department of Operative Dentistry, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran
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Abbasi M, Pordel E, Chiniforush N, Firuzjaee SG, Omrani LR. Hydrogen peroxide penetration into the pulp chamber during conventional in-office bleaching and diode laser-assisted bleaching with three different wavelengths. Laser Ther 2019; 28:285-290. [PMID: 32255920 PMCID: PMC7087340 DOI: 10.5978/islsm.19-or-20] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2019] [Accepted: 11/11/2019] [Indexed: 11/06/2022]
Abstract
BACKGROUND AND AIMS Penetration of hydrogen peroxide into the pulp chamber and subsequent tooth hypersensitivity is a common concern in dental bleaching. The aim of this study was to assess the penetration of hydrogen peroxide (H2O2) into the pulp chamber in diode-laser activated bleaching with different laser wavelengths. MATERIALS AND METHODS Fifty extracted human maxillary anterior teeth were collected and divided into five groups(n = 10). Group 1: conventional in-office bleaching using Opalescence Boost gel. Group 2: Bleaching with Biolase Laser White 20 gel activated by 980 nm diode laser. Group 3: Bleaching with Biolase Laser White 20 gel activated by 810 nm diode laser. Group 4: Bleaching with Biolase Laser White 20 gel activated by 940 nm diode laser. Group 5: No bleaching control group.After bleaching, the solution into the pulp chamber was collected and analyzed using a spectrophotometer. The recorded data were compared with a standard sample and the results were analyzed and compared using one-way ANOVA and Tukey's HSD tests. RESULTS In all bleached groups, H2O2 had infiltrated into the pulp chamber. The highest level of penetration was noted in group 2 (2.32 ± 0.25 µg), while the lowest level was noted in group 3 (1.85 ± 0.33 µg). The difference in this regard was significant between groups 2 and 3 (P = 0.024), but the differences between other groups were not statistically significant (P ≥ 0.42). CONCLUSION Considering the results of this study, it can be stated that hydroge peroxide penetration in to pulp chamber in diode laser activation of bleaching agent according to manufactures instruction is not higher than in-office bleaching. The wavelength of diode laser had significant effect on penetration of hydrogen peroxide into pulp chamber.
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Affiliation(s)
- Mahdi Abbasi
- DDS, MSc's, assistant professor, Restorative Dentistry Department, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran
| | - Edris Pordel
- Department of Pediatric Dentistry, Borujerd Branch, Islamic Azad University Boroujerd, Iran
| | - Nasim Chiniforush
- Dentist, PhD of laser dentistry, Laser Research Canter of Dentistry, Dental Research Institute, Tehran University of Medical Sciences, Tehran, Iran
| | - Sattar Gorgani Firuzjaee
- DDS. Department of Medical Laboratory Sciences, School of Allied Health Medicine, Aja University of Medical Sciences, Tehran, Iran
| | - Ladan Ranjbar Omrani
- DDS, MSc's, associate professor, Restorative Dentistry Department, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran
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Warkentin M, Freyse C, Specht O, Behrend D, Maletz R, Janda R, Ottl P. Correlation of ultrasound microscopy and Vickers hardness measurements of human dentin and enamel - A pilot study. Dent Mater 2018; 34:1036-1040. [PMID: 29678330 DOI: 10.1016/j.dental.2018.03.020] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2018] [Accepted: 03/24/2018] [Indexed: 10/17/2022]
Abstract
OBJECTIVE To investigate if Vickers microhardness of dentin and enamel correlated with acoustic velocity c(l) or acoustic reflection from the sample's top (amplitude). METHODS Eight transversal sections of a sound human tooth were investigated with scanning acoustic microscopy (SAM) and Vickers microhardness measurements. Longitudinal acoustic velocity c(l), amplitude and microhardness MHV were evaluated and for each c(l) test point corresponding amplitude and MHV were linearly interpolated and graphically analyzed. Spearman rank order correlation (rS) was calculated (p<0.05). RESULTS c(l) was predominantly 6100-7000ms-1 in enamel and 3800-4600ms-1 in dentin and correlated significantly with MHV with 27-420 in enamel and 20-90 in dentin (rs=0,57). Amplitudes significantly correlated with MHV, too, but even better (rs=0,77). SIGNIFICANCE Acoustic velocity and amplitudes were appropriate to detect microhardness differences of dentin and enamel and certain value ranges of both could be assigned to certain MHV ranges. Further research is needed to differentiate more precisely between the different hard tooth tissues.
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Affiliation(s)
- Mareike Warkentin
- Department of Materials Science and Medical Engineering, Friedrich-Barnewitz-Strasse 4, 18119 Rostock, University of Rostock, Germany
| | - Cora Freyse
- Department of Prosthodontics and Materials Science, Strempelstrasse 13, 18057 Rostock, University of Rostock, Germany
| | - Olaf Specht
- Institute of ImplantTechnology and Biomaterials e.V., Rostock, Friedrich-Barnewitz-Strasse 4, 18119 Rostock, Germany
| | - Detlef Behrend
- Department of Materials Science and Medical Engineering, Friedrich-Barnewitz-Strasse 4, 18119 Rostock, University of Rostock, Germany
| | - Reinhard Maletz
- Department of Materials Science and Medical Engineering, Friedrich-Barnewitz-Strasse 4, 18119 Rostock, University of Rostock, Germany
| | - Ralf Janda
- Dept. of Operative and Preventive Dentistry and Endodontics, Centre of Dentistry, Medical Faculty, Heinrich-Heine-University, Moorenstraße 5, Geb. 18.13, D-40225 Düsseldorf, Germany.
| | - Peter Ottl
- Department of Prosthodontics and Materials Science, Strempelstrasse 13, 18057 Rostock, University of Rostock, Germany
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