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Sayed Ahmed A, Lawson NC, Fu CC, Bora PV, Kee E, Nejat AH. The Effect of Die Material on the Crown Fracture Strength of Zirconia Crowns. Materials (Basel) 2024; 17:1096. [PMID: 38473568 DOI: 10.3390/ma17051096] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/24/2024] [Revised: 02/16/2024] [Accepted: 02/26/2024] [Indexed: 03/14/2024]
Abstract
BACKGROUND Determination of the eligibility of several tooth analog materials for use in crown fracture testing. METHODS A standardized premolar crown preparation was replicated into three types of resin dies (C&B, low modulus 3D printed resin; OnX, high modulus 3D printed resin composite; and highest modulus milled resin composite). 0.8 mm zirconia crowns were bonded to the dies and the maximum fracture load of the crowns was tested. Twelve extracted human premolars were prepared to a standardized crown preparation, and duplicate dies of the prepared teeth were 3D printed out of C&B. Zirconia crowns were bonded to both the dies and natural teeth, and their fracture load was tested. RESULTS There was no statistical difference between the fracture load of zirconia crowns bonded to standardized dies of C&B (1084.5 ± 134.2 N), OnX (1112.7 ± 109.8 N) or Lava Ultimate (1137.5 ± 88.7 N) (p = 0.580). There was no statistical difference between the fracture load of crowns bonded to dentin dies (1313 ± 240 N) and a 3D-printed resin die (C&B, 1156 ± 163 N) (p = 0.618). CONCLUSIONS There was no difference in the static fracture load of zirconia crowns bonded to standardized resin dies with different moduli or between a low modulus resin die and natural dentin die.
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Affiliation(s)
- Akram Sayed Ahmed
- Department of Dental Biomaterials, Faculty of Dentistry, Tanta University, Tanta 6624033, Egypt
- Division of Biomaterials, University of Alabama at Birmingham School of Dentistry, Birmingham, AL 35209, USA
| | - Nathaniel C Lawson
- Division of Biomaterials, University of Alabama at Birmingham School of Dentistry, Birmingham, AL 35209, USA
| | - Chin-Chuan Fu
- Division of Prosthodontics, University of Alabama at Birmingham School of Dentistry, Birmingham, AL 35209, USA
| | - Pranit V Bora
- Division of Biomaterials, University of Alabama at Birmingham School of Dentistry, Birmingham, AL 35209, USA
| | - Edwin Kee
- Division of Prosthodontics, LSU School of Dentistry, New Orleans, LA 70119, USA
| | - Amir H Nejat
- Division of Prosthodontics, LSU School of Dentistry, New Orleans, LA 70119, USA
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Shah K, Lawson NC, Sayed Ahmed A, Nizami B, Lawson TJ, Kee E, Nejat AH. Wear of lithium disilicate opposed by various ceramic materials. J ESTHET RESTOR DENT 2024; 36:356-362. [PMID: 37526391 DOI: 10.1111/jerd.13115] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2023] [Revised: 06/27/2023] [Accepted: 07/14/2023] [Indexed: 08/02/2023]
Abstract
OBJECTIVES To compare volumetric wear of lithium disilicate against different ceramic (3 mol% yttria-stabilized (3Y) zirconia, 5 mol% yttria-stabilized (5Y) zirconia, lithium disilicate, porcelain and enamel antagonists). MATERIALS AND METHODS Forty lithium disilicate (e.max CAD) specimens (n = 8/antagonist) were wet sanded to 1200grit SiC and mounted into a UAB wear device. Antagonist spheres (diameter = 4.75 mm) were made from polished 3Y zirconia, 5Y zirconia, lithium disilicate, porcelain and human enamel. A two-body wear test was performed with 20 N load and 1.5 mm slide for 400,000 cycles at 1 Hz. 33% glycerin was used as a lubricant. Wear facets were measured with optical profilometry. Wear scar areas of antagonists were measured with digital microscopy. Scanning electron microscopy was performed on wear facets and scars. Vicker's microhardness was measured of all antagonist materials. All data were compared with 1-way ANOVA and Tukey post-hoc analysis. RESULTS Significant differences in lithium disilicate volumetric wear (mm3 ) occurred with various antagonist materials: 0.38 ± 0.01a (3Y zirconia), 0.33 ± 0.01b, (5Y zirconia), 0.16 ± 0.01c (lithium disilicate), 0.11 ± 0.03d, (enamel), and 0.07 ± 0.01e (porcelain). The lithium disilicate antagonist demonstrated a larger wear scar than other materials. Zirconia was the hardest material and enamel the least hard. CONCLUSIONS Zirconia causes significant wear on lithium disilicate and lithium disilicate causes significant wear against itself. CLINICAL SIGNIFICANCE When selecting a material to oppose an existing lithium disilicate crown, a porcelain or lithium disilicate surface would cause significantly less wear to the existing crown. If an existing zirconia crown exists opposed to a prepared tooth, lithium disilicate may not be an ideal material selection to restore the tooth.
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Affiliation(s)
- Krisha Shah
- Division of Biomaterials, UAB School of Dentistry, Birmingham, Alabama, USA
| | - Nathaniel C Lawson
- Division of Biomaterials, UAB School of Dentistry, Birmingham, Alabama, USA
| | - Akram Sayed Ahmed
- Division of Biomaterials, UAB School of Dentistry, Birmingham, Alabama, USA
| | - Bushra Nizami
- Division of Biomaterials, UAB School of Dentistry, Birmingham, Alabama, USA
| | - Thomas J Lawson
- Division of Biomaterials, UAB School of Dentistry, Birmingham, Alabama, USA
| | - Edwin Kee
- Division of Prosthodontics, LSU School of Dentistry, New Orleans, Louisiana, USA
| | - Amir H Nejat
- Division of Prosthodontics, LSU School of Dentistry, New Orleans, Louisiana, USA
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Retana L, Nejat AH, Pozzi A. Effect of splinting scan bodies on trueness of complete-arch implant impression using different intraoral scanners: an in vitro study. Int J Comput Dent 2023; 26:19-28. [PMID: 35072425 DOI: 10.3290/j.ijcd.b2599297] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/25/2023]
Abstract
AIM To evaluate the trueness of seven different intraoral scanners (IOSs) in making a complete-arch digital scan with and without splinting the scan bodies. MATERIALS AND METHODS A polyurethane cast of an edentulous mandible with four dental implant analogs was prepared. A reference scan was made using a laboratory scanner. The reference model was scanned with each of the seven investigated IOSs (control groups, n = 10 per scanner), and scanned again after splinting the scan bodies (study groups, n = 10 per scanner). Each scan was exported as a standard tessellation language (STL) file and transferred to a comprehensive metrology software program (Geomagic Control X). In order to measure the trueness, four points (A, B, C, and D) were determined on the scan bodies, and the distance between point A and the other points (DAB, DAC, and DAD) was measured. The measurements were tested for normality using the Kolmogorov-Smirnov test and probability plots. Trueness was compared using three-way analysis of variance (ANOVA), and pairwise comparisons were performed using the post hoc Tukey and paired sample t tests. Statistical analyses were two-sided, and the significance level was set at 5%. RESULTS Splinting the scan bodies improved the trueness values of the digital scans, while increasing the interimplant distance decreased them. A significant association was found between the trueness values and all three tested variables, including splinting the scan bodies, type of IOS, and interimplant distance (P < 0.001). CONCLUSION Based on the present findings, splinting the scan bodies can improve the trueness of complete-arch digital implant scans due to the improvement in morphologic landmarks by the stitching process, regardless of the type of IOS or the interimplant distance. (Int J Comput Dent 2023;26(1): 19-0; doi: 10.3290/j.ijcd.b2599297).
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Nejat AH, Hamdan S, Abrego I, Lindsey JT, Vitter R. Fully Digital Workflow for Fabrication of A 3D Printed Ear Stent for Auricular Keloids: A Technique Article. J Prosthodont 2021; 31:266-270. [PMID: 34811842 DOI: 10.1111/jopr.13455] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/30/2021] [Indexed: 11/28/2022] Open
Abstract
Keloids are skin lesions which result from an aberration in the physiological healing process marked with overgrowth of collagen fibers. Keloid of the ear is cosmetically challenging and has an increased chance of re-growth. To minimize recurrence, pressure therapy in combination with other treatment forms has been used. Various techniques have been used to fabricate a passive or active stent. This report presents a fully digital workflow to fabricate an ear stent after intralesional excision and skin autografting of an extensive recurrence of a keloid lesion of the left ear involving the helix, antihelix, scapha and conchal bowl. This article is protected by copyright. All rights reserved.
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Affiliation(s)
- Amir H Nejat
- Assistant Professor, Prosthodontics Department, Louisiana State University Health Science Center, School of Dentistry, New Orleans, LA
| | - Suleiman Hamdan
- Associate Professor, Prosthodontics Department, Louisiana State University Health Science Center, School of Dentistry, New Orleans, LA
| | | | - John T Lindsey
- Clinical Associate Professor of Surgery, Division of Plastic and Reconstructive Surgery, Tulane University School of Dentistry
| | - Roger Vitter
- Assistant Professor, Prosthodontics Department, Louisiana State University Health Science Center, School of Dentistry, New Orleans, LA
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Nejat AH, Xu X, Kee E, Lawson NC. Methods to Clean Residual Resin Cement from Lithium-Disilicate Glass-Ceramic. J Adhes Dent 2021; 23:319-326. [PMID: 34269542 DOI: 10.3290/j.jad.b1367933] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
PURPOSE To compare the effect of different methods of cleaning residual composite cement from the surface of lithium-disilicate glass-ceramic on its bond strength. MATERIALS AND METHODS Blocks of lithium-silicate glass-ceramic (e.max CAD) were coated with composite cement. Blocks in a positive control (CO+) group received no cement; negative controls (CO-) received composite cement. After water storage (24 h), specimens were cleaned as follows (n = 20/group): BUR: grinding with a fine-grit diamond bur (20 s); ALUM: air abrasion with 50-µm alumina (10 s); GLASS: air abrasion with 50-µm glass beads (10 s); FURN: firing in ceramic furnace and cleaning with ethanol; SULF: immersion in sulfonic acid solution (1 h); HYFL: no additional treatment. All specimens were etched with hydrofluoric acid, aside from the CO- group, and treated with silane. A 1.5-mm diameter cement-filled tube was affixed to the specimens and light polymerized. Specimens were stored in 37°C water for 24 h (n = 10) or 90 days (n = 10). Shear bond strength was tested. Two-way ANOVA and post-hoc Tukey tests were performed. Specimens from each group were examined with SEM. RESULTS Bond strength significantly differed according to surface cleaning method (p < 0.01) and storage time (p < 0.01), but their interaction was not significant (p = 0.264). Longer storage time decreased the bond strength. BUR, ALUM, GLASS, and FURN did not differ statistically significantly from CO+, but were significantly greater than CO-. SULF and HYFL did not differ statistically significantly from CO- and were significantly lower than CO+. CONCLUSIONS Cleaning composite cement with BUR, ALUM, GLASS, and FURN restored bond strengths to that of the positive control. However, only GLASS and FURN did not roughen the surface of the underlying lithium-silicate glass-ceramic.
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Nejat AH, Dupree P, Kee E, Xu X, Zakkour W, Odom M, Bruggers K, Mascarenhas F. Effect of Endodontic Access Preparation on Fracture Load of Translucent versus Conventional Zirconia Crowns with Varying Occlusal Thicknesses. J Prosthodont 2021; 30:706-710. [DOI: 10.1111/jopr.13337] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/14/2021] [Indexed: 11/29/2022] Open
Affiliation(s)
- Amir H. Nejat
- Prosthodontics Department Louisiana State University Health Science Center, School of Dentistry New Orleans LA
| | - Peter Dupree
- Comprehensive Dentistry and Biomaterials Department Louisiana State University Health Science Center, School of Dentistry New Orleans LA
| | - Edwin Kee
- Prosthodontics Department Louisiana State University Health Science Center, School of Dentistry New Orleans LA
| | - Xiaoming Xu
- Oral and Craniofacial Biology Department, Division of Biomaterials Louisiana State University Health Science Center, School of Dentistry New Orleans LA
| | - Wael Zakkour
- Prosthodontics Department Louisiana State University Health Science Center, School of Dentistry New Orleans LA
| | - Mark Odom
- Endodontics Department Louisiana State University Health Science Center, School of Dentistry New Orleans LA
| | - Karen Bruggers
- Prosthodontics Department Louisiana State University Health Science Center, School of Dentistry New Orleans LA
| | - Faye Mascarenhas
- Prosthodontics Department Louisiana State University Health Science Center, School of Dentistry New Orleans LA
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Nejat AH, Lee J, Shah S, Lin CP, Kulkarni P, Chavali R, Lawson NC. Retention of CAD/CAM resin composite crowns following different bonding protocols. Am J Dent 2018; 31:97-102. [PMID: 29630794 PMCID: PMC7135944] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
PURPOSE To evaluate the effect of different surface treatments and primers with a CAD/CAM resin composite block on its crown retention. METHODS 120 human molars were prepared with a 24° total convergence angle, 1.5 mm height, and axial walls in dentin. Surface area was measured by digital microscopy. Crowns were machined from CAD/CAM resin composite blocks. Teeth were randomly allocated to 12 groups (n= 10) based on possible combinations of three surface treatments: [Control, Alumina air abrasion (50-µm Al₂O₃ at 0.28 MPa) ]; 5% hydrofluoric acid etch (20-second scrub); silane application (with or without Kerr Silane primer); and adhesive application (with or without Optibond XTR Adhesive). Optibond XTR Adhesive was applied to the tooth preparations and crowns were bonded with MaxCem Elite cement. Crowns were fatigued for 100,000 cycles at 100 N in water and debonded in tension (1 mm/minute). Crown retention strength (maximum load/surface area) values were analyzed using a three-way ANOVA with Tukey's post-hoc tests (α= 0.05). RESULTS Surface treatment, silane and adhesive applications independently affect retention force (P< 0.05). All interactions were not significant (P> 0.05). Alumina airborne abrasion surface treatment, silane and adhesive applications all improve retention strength. Therefore, CAD/CAM resin composite crowns can withstand debonding while undergoing mechanical fatigue. Although all forms of surface treatment and primer application improve bond strength, the highest mean retention strength values were recorded when the crowns were alumina particle abraded and coated with adhesive (with or without silane). CLINICAL SIGNIFICANCE In order to improve the bonding of resin composite crowns, application of alumina airborne particle abrasion and a coat of adhesive (proceeded by an optional coat of silane) is recommended. If hydrofluoric acid is utilized, the crowns should be treated with a coat of silane followed by adhesive application.
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Affiliation(s)
- Amir H Nejat
- Department of Prosthodontics, Louisiana State University, New Orleans, Louisiana, USA
| | - Jinwhan Lee
- Glidewell Laboratories, Newport Beach, California, USA
| | - Shreya Shah
- Glidewell Laboratories, Newport Beach, California, USA
| | - Chee Paul Lin
- Center for Clinical and Translational Science, University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Prajakta Kulkarni
- Clinical and Community Sciences, Division of Biomaterials, University of Alabama at Birmingham School of Dentistry, Birmingham, Alabama, USA
| | - Ramakiran Chavali
- Restorative Sciences, Division of Prosthodontics, University of Alabama at Birmingham School of Dentistry, Birmingham, Alabama, USA
| | - Nathaniel C Lawson
- Clinical and Community Sciences, Division of Biomaterials, University of Alabama at Birmingham, School of Dentistry, Birmingham, Alabama, USA
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Kwon SJ, Lawson NC, McLaren EE, Nejat AH, Burgess JO. Comparison of the mechanical properties of translucent zirconia and lithium disilicate. J Prosthet Dent 2018; 120:132-137. [PMID: 29310875 DOI: 10.1016/j.prosdent.2017.08.004] [Citation(s) in RCA: 128] [Impact Index Per Article: 21.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2017] [Revised: 08/07/2017] [Accepted: 08/08/2017] [Indexed: 10/18/2022]
Abstract
STATEMENT OF PROBLEM Three mol% yttria-stabilized tetragonal zirconia polycrystal (3Y-TZP) possesses excellent mechanical properties but is relatively opaque. Five mol% yttria-stabilized zirconia polycrystal (5Y-ZP) offers improved translucency, but many of its clinical properties have not been compared with those of 3Y-TZP and lithium disilicate. PURPOSE The purpose of this in vitro study was to compare the flexural strength, translucency parameter, bond strength, and enamel and material wear of 5Y-ZP (Katana UTML) with 3Y-TZP (Katana HT) and lithium disilicate (e.max CAD). MATERIAL AND METHODS Flexural strength bars were sectioned (n=10, 25×4×2 mm), sintered or crystallized, polished, and fractured at 1 mm/min. Translucency specimens (1 mm thick) were fabricated (n=10). Their L*a*b* values were measured against a black-and-white background with a spectrophotometer, and ΔE00 was calculated. Zirconia bond strength specimens were airborne-particle abraded with 50 μm alumina followed by the application of a 10-methacryloxydecyl dihydrogen phosphate-containing primer (Clearfil Ceramic Primer). Lithium disilicate bond strength specimens were etched with 5% hydrofluoric acid followed by application of a silane-containing primer (Clearfil Ceramic Primer). A Tygon tube filled with resin cement (Panavia SA) was fixed to the surface of the ceramics and light-polymerized. After 1 day or 150 days of water storage, the resin cement was debonded in a macroshear test (n=10). The cusps of extracted human molars were isolated and mounted into the University of Alabama at Birmingham wear-testing device. Wear testing was performed with a 20-N load for 300000 cycles in 33% glycerin. The volumetric wear of polished zirconia, lithium disilicate, and enamel were measured along with the wear of the opposing enamel cusps using a noncontact profilometer (n=8). The data were compared by ANOVA and Tukey-Kramer analysis (α=.05). RESULTS No statistical difference was seen between the bond strengths (P=.155) or the opposing enamel wear (P=.533) of different ceramics. A statistically significant difference was seen between the flexural strength (P<.001), translucency parameter (P<.001), and wear (P<.001) of the materials. The flexural strength values (MPa) were 1194 ±111 (Katana HT), 688 ±159 (Katana UTML), and 450 ±53 (e.max LT). The translucency parameter values were 6.96 ±0.53 (Katana HT), 8.30 ±0.24 (Katana UTML), 9.28 ±0.36 (e.max LT), and 12.64 ±0.48 (e.max HT). Bond strength values (MPa) at 1 and 150 days were 34.22 ±5.14 and 28.37 ±6.03 (Katana HT), 35.04 ±5.69 and 25.03 ±6.44 (Katana UTML), and 35.50 ±3.45 and 22.32 ±3.45 (e.max LT). Material and enamel wear (mm3) were 0 and 0.24 ±0.19 (Katana HT), 0 and 0.23 ±0.09 (Katana UTML), 0.28 ±0.13 and 0.31 ±0.10 (e.max CAD), and 0.09 ±0.03 and 0.31 ±0.14 (enamel). CONCLUSIONS 5Y-TZP has a flexural strength and translucency parameter between those of 3Y-TZP and lithium disilicate. Both the short-term and long-term bond strength of 5Y-ZP and 3Y-TZP was shown to be similar to lithium disilicate. 5Y-ZP demonstrated no measurable material wear and opposing enamel wear similar to that of all the other materials tested.
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Affiliation(s)
- Sung Joon Kwon
- Predoctoral student, Department of Chemistry, University of Alabama at Birmingham, Birmingham, Ala
| | - Nathaniel C Lawson
- Assistant Professor, Department of Biomaterials, Clinical and Community Sciences, University of Alabama at Birmingham, Birmingham, Ala.
| | - Edward E McLaren
- Professor, Department of Biomaterials, Clinical and Community Sciences, University of Alabama at Birmingham, Birmingham, Ala
| | - Amir H Nejat
- Resident, Department of Prosthodontics, Louisiana State University, New Orleans, La
| | - John O Burgess
- Adjunct Professor, Department of Biomaterials, Clinical and Community Sciences, University of Alabama at Birmingham, Birmingham, Ala
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Abstract
STATEMENT OF PROBLEM Although new materials are available for computer-aided design and computer-aided manufacturing (CAD-CAM) fabrication, limited information is available regarding their machinability. The depth of penetration of a milling tool into a material during a timed milling cycle may indicate its machinability. PURPOSE The purpose of this in vitro study was to compare the tool penetration rate for 2 polymer-containing CAD-CAM materials (Lava Ultimate and Enamic) and 2 ceramic-based CAD-CAM materials (e.max CAD and Celtra Duo). MATERIAL AND METHODS The materials were sectioned into 4-mm-thick specimens (n=5/material) and polished with 320-grit SiC paper. Each specimen was loaded into a custom milling apparatus. The apparatus pushed the specimens against a milling tool (E4D Tapered 2016000) rotating at 40 000 RPM with a constant force of 0.98 N. After a 6-minute timed milling cycle, the length of each milling cut was measured with image analysis software under a digital light microscope. Representative specimens and milling tools were examined with scanning electron microscopy (SEM) and energy dispersive x-ray spectroscopy. RESULTS The penetration rate of Lava Ultimate (3.21 ±0.46 mm/min) and Enamic (2.53 ±0.57 mm/min) was significantly greater than that of e.max CAD (1.12 ±0.32 mm/min) or Celtra Duo (0.80 ±0.21 mm/min) materials. SEM observations showed little tool damage, regardless of material type. Residual material was found on the tools used with polymer-containing materials, and wear of the embedding medium was seen on the tools used with the ceramic-based materials. Edge chipping was noted on cuts made in the ceramic-based materials. CONCLUSIONS Lava Ultimate and Enamic have greater machinability and less edge chipping than e.max CAD and Celtra Duo.
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Affiliation(s)
- Ramakiran Chavali
- Assistant Professor, Division of Prosthodontics, Department Restorative Sciences, University of Alabama at Birmingham, Birmingham, Ala
| | - Amir H Nejat
- Graduate student, Department of Biomaterials, Clinical and Community Sciences, University of Alabama at Birmingham, Birmingham, Ala
| | - Nathaniel C Lawson
- Assistant Professor, Department of Biomaterials, Clinical and Community Sciences, University of Alabama at Birmingham, Birmingham, Ala.
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Akbari M, Nejat AH, Farkhondeh N, Mehraban Moghadam S, Hashemy SI, Mohammadipour HS. Does at-home bleaching induce systemic oxidative stress in healthy subjects? Aust Dent J 2016; 62:58-64. [PMID: 27091347 DOI: 10.1111/adj.12425] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/14/2016] [Indexed: 02/04/2023]
Abstract
BACKGROUND At-home bleaching is a technique characterized by the use of carbamide peroxide or hydrogen peroxide as a tooth-whitening agent. However, no data exist regarding systemic safety of this technique. The aim of this study was to investigate the effect of at-home bleaching on serum redox homeostasis. METHODS Twenty-nine healthy volunteers who requested tooth-whitening participated in this study. Specified bleaching trays were fabricated for the maxilla and mandible arches. Each participant was given two syringes containing 9% hydrogen peroxide gel to use for 30 min/night for 14 nights consecutively. To evaluate the redox status, the serum concentrations of malondialdehyde (MDA), total antioxidant capacity (TAC) and pro-oxidant-antioxidant balance (PAB) were measured. Blood samples were obtained in the morning prior to initiation of study and the morning after expiration of the bleaching period. The collected data were analyzed using Student's t-test with 95% confidence interval. RESULTS Twenty-three subjects completed the study. MDA, PAB and TAC were significantly increased after the bleaching period (P = 0.001, 0.001 and 0.002, respectively). CONCLUSIONS At-home bleaching revealed the potential to disturb oxidant-antioxidant balance and induce oxidative stress. Its clinical relevance is unfavourable and potential side-effects of at-home bleaching should be considered.
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Affiliation(s)
- M Akbari
- Dental Research Centre, Department of Operative and Esthetic Dentistry, School of Dentistry, Mashhad University of Medical Sciences, Mashhad, Iran
| | - A H Nejat
- Post Graduate Student of Faculty of Dentistry, Mashhad University of Medical Sciences, Mashhad, Iran
| | - N Farkhondeh
- Department of Operative and Esthetic Dentistry, School of Dentistry, Jundishapur University of Medical Sciences, Ahvaz, Iran
| | - S Mehraban Moghadam
- Department of Immunology, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
| | - S I Hashemy
- Surgical Oncology Research Centre, Mashhad University of Medical Sciences, Mashhad, Iran.,Department of Biochemistry, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
| | - H S Mohammadipour
- Dental Materials Research Centre, Department of Operative and Esthetic Dentistry, School of Dentistry, Mashhad University of Medical Sciences, Mashhad, Iran
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Nejat AH, Eshghpour M. Dry socket following surgical removal of impacted third molar in an Iranian population: Incidence and risk factors. Niger J Clin Pract 2013; 16:496-500. [DOI: 10.4103/1119-3077.116897] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Nejat AH, Falaki F, Sani ZD, Danaeifar N. Efficacy of CO2 laser in treatment of plaque like oral lichen planus. Med Oral Patol Oral Cir Bucal 2012. [DOI: 10.4317/medoral.17643648] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
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