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Ramirez I, Bertolini GR, Candemil AP, Sousa-Neto MD, Souza-Gabriel AE. Chemical and morphological analysis of dentin irradiated by different high-power lasers: a systematic review. Lasers Med Sci 2023; 38:255. [PMID: 37932490 DOI: 10.1007/s10103-023-03912-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2023] [Accepted: 10/12/2023] [Indexed: 11/08/2023]
Abstract
PURPOSE This systematic review provides an overview of the main chemical and morphological alterations generated on dentin by different high-power lasers' irradiation. METHODS The review was registered in PROSPERO (CRD42023394164) and PRISMA guidelines were followed. The search strategy was conducted on MEDLINE (PubMed), Embase (Elsevier), and Web of Science (Clarivate) databases. The eligibility criteria were established according to the PICOS strategy, focusing on in vitro and ex vivo studies that assessed the chemical and morphological changes in dentin using five high-power lasers: Nd:YAG (1064 nm), Er:YAG (2940 nm), Er, Cr:YSGG (2780 nm), diode (980 nm), and CO2 (10,600 nm). Publication range was from 2010 to 2022. Data was summarized in tables and risk of bias was assessed by QUIN tool. RESULTS The search resulted in 2255 matches and 57 studies composed the sample. The methods most used to assess the outcomes were scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS), and Raman. The studies presented "medium" and "low" risk of bias. The laser prevalently identified was the Er:YAG laser, associated with dentin ablation, absence of smear layer, and exposed tubules. The Nd:YAG laser generated vitreous surface and thermal damage, such as carbonization and cracks. The other lasers caused an irregular surface and no adverse thermal effects. Regarding the chemical structure, only the Er,Cr:YSGG laser caused collagen matrix reduction. The effects found were more intense with higher dosimetry. CONCLUSION Evidence available indicates that the irradiation of dentin with high-power lasers are related to morphological outcomes favorable to adhesive restorative procedures, with minimal changes in collagen matrix and mineral content. However, those observations should be carried carefully by clinicians and more clinical trials regarding the association of high-power laser irradiation and restorative procedure longevity are needed.
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Affiliation(s)
- Iago Ramirez
- Department of Restorative Dentistry, School of Dentistry of Ribeirão Preto, University of São Paulo (USP), Avenida do Café, s/n - USP's campus, Ribeirão Preto, SP, 14040-904, Brazil
| | - Gunther R Bertolini
- Department of Restorative Dentistry, School of Dentistry of Ribeirão Preto, University of São Paulo (USP), Avenida do Café, s/n - USP's campus, Ribeirão Preto, SP, 14040-904, Brazil
| | - Amanda P Candemil
- Department of Restorative Dentistry, School of Dentistry of Ribeirão Preto, University of São Paulo (USP), Avenida do Café, s/n - USP's campus, Ribeirão Preto, SP, 14040-904, Brazil
| | - Manoel D Sousa-Neto
- Department of Restorative Dentistry, School of Dentistry of Ribeirão Preto, University of São Paulo (USP), Avenida do Café, s/n - USP's campus, Ribeirão Preto, SP, 14040-904, Brazil
| | - Aline E Souza-Gabriel
- Department of Restorative Dentistry, School of Dentistry of Ribeirão Preto, University of São Paulo (USP), Avenida do Café, s/n - USP's campus, Ribeirão Preto, SP, 14040-904, Brazil.
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Martín G, Preve V, Hargreaves K, Diogenes A, Inostroza C, Saint-Jean N, Brizuela C. Effect of Dentin Conditioning with EDTA and Diode Lasers on Expression of Odontoblast-like Cell Markers of Dental Pulp Stem Cells. Dent J (Basel) 2023; 11:210. [PMID: 37754330 PMCID: PMC10527775 DOI: 10.3390/dj11090210] [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: 06/09/2023] [Revised: 08/22/2023] [Accepted: 08/30/2023] [Indexed: 09/28/2023] Open
Abstract
Regenerative endodontic procedures rely on the delivery of mesenchymal stem cells into the root canal and on the effect of local growth factors from the dentin and blood clot. The aim of this study was to assess the effect of dentin conditioning with ethylenediamine tetraacetic acid (EDTA) and diode lasers with different wavelengths (808 nm and 980 nm) on the expression of odontoblast-like cell markers. Forty dentin cylinders were divided into four groups according to the irrigation protocol: EDTA, EDTA + 808 nm diode laser, EDTA + 980 nm diode laser, and phosphate-buffered saline as the control group. Dental pulp stem cells were seeded into the previously conditioned cylinders and incubated for 14 days. The quantitative real-time polymerase chain reaction was used to evaluate the expression of dentin sialophosphoprotein (DSPP), dentin morphoprotein-1 (DMP-1), and transforming growth factor-beta 1 (TGF-β1). Data analysis was performed using the Kruskal-Wallis test. The activation of EDTA with 980 nm and 808 nm diode lasers resulted in lower DSPP and DMP-1 expression than that for EDTA alone (p < 0.05 and p < 0.01, respectively). The expression of TGF was similar among all groups. The highest level of expression of odontoblast-like differentiation markers was observed with EDTA alone. However, the use of an 808 nm diode laser during EDTA irrigation reduced the expression of odontoblastic differentiation markers.
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Affiliation(s)
- Gabriela Martín
- Department of Endodontics, Universidad Católica de Córdoba, Córdoba 5000, Argentina
- Faculty of Dentistry, Universidad Nacional de Córdoba, Córdoba 5000, Argentina
| | | | - Kenneth Hargreaves
- Department of Endodontics, University of Texas Health Science Center at San Antonio, San Antonio, TX 78229, USA; (K.H.); (A.D.)
| | - Anibal Diogenes
- Department of Endodontics, University of Texas Health Science Center at San Antonio, San Antonio, TX 78229, USA; (K.H.); (A.D.)
| | - Carolina Inostroza
- Dental School, Universidad de los Andes, Santiago de Chile 7550000, Chile; (C.I.); (N.S.-J.); (C.B.)
| | - Nicole Saint-Jean
- Dental School, Universidad de los Andes, Santiago de Chile 7550000, Chile; (C.I.); (N.S.-J.); (C.B.)
| | - Claudia Brizuela
- Dental School, Universidad de los Andes, Santiago de Chile 7550000, Chile; (C.I.); (N.S.-J.); (C.B.)
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Pelozo LL, Silva-Neto RD, Salvador SL, Sousa-Neto MD, Souza-Gabriel AE. Adjuvant therapy with a 980-nm diode laser in root canal retreatment: randomized clinical trial with 1-year follow-up. Lasers Med Sci 2023; 38:77. [PMID: 36823417 PMCID: PMC9950011 DOI: 10.1007/s10103-022-03659-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2021] [Accepted: 10/28/2022] [Indexed: 02/25/2023]
Abstract
The purpose of this study is to assess the laser effect in root canal disinfection and periapical healing of endodontically treated teeth from patients with asymptomatic apical periodontitis. This study was performed as a randomized clinical trial. Thirty patients were selected according to the inclusion/exclusion criteria. Fifteen patients received the root canal retreatment (RCR) combined with 980-nm diode laser irradiation (LI). The canals were irrigated with saline solution and gently dried with paper points, keeping the dentin partially moist. The irradiation was performed using a 320-µm-diameter fiber in helicoidal movements (pulsed mode, power output of 1.5 W, 100 Hz for 20 s). The other 15 patients received the RCR with placebo irradiation (PI). Microbiological samples were taken in three periods: S1, after the filling material removal (baseline); S2, after laser or placebo irradiation (LI or PI); and S3, after the RCR followed by laser or placebo. The samples were submitted to the total microbial and E. faecalis counting. The periapical radiographic healing was analyzed after 3, 6, 9, and 12 months. Microbiological data (CFU/mg) were analyzed by ANOVA and Tukey's test (P < 0.05), and the repair by Mann-Whitney test (P < 0.05). In S2, the laser provided 42.44% microbial reduction and 53.14% of E. faecalis, different from the placebo that had no reduction, and 4.85% for Enterococcus (P < 0.05). In S3, the bacterial counts decreased without differences between groups. No differences in healing were found at 3 months. However, diode laser facilitated the repair from 3- to 12-month follow-up (P < 0.05) and had 45% more healed cases than placebo. Diode laser provided an antimicrobial effect before the biomechanical preparation but was not synergistic in RCR. It improved the periapical healing during follow-up.
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Affiliation(s)
- Laís Lima Pelozo
- Department of Restorative Dentistry, School of Dentistry of Ribeirão Preto, University of São Paulo, Av. Café S/N, Ribeirao Preto, São Paulo, 14040-904, Brazil
| | - Reinaldo Dias Silva-Neto
- Department of Restorative Dentistry, School of Dentistry of Ribeirão Preto, University of São Paulo, Av. Café S/N, Ribeirao Preto, São Paulo, 14040-904, Brazil
| | - Sérgio Luiz Salvador
- Department of Clinical, Toxicological and Bromatological Analyses, School of Pharmaceutical Sciences of Ribeirão Preto, University of São Paulo, Ribeirao Preto, Brazil
| | - Manoel Damião Sousa-Neto
- Department of Restorative Dentistry, School of Dentistry of Ribeirão Preto, University of São Paulo, Av. Café S/N, Ribeirao Preto, São Paulo, 14040-904, Brazil
| | - Aline Evangelista Souza-Gabriel
- Department of Restorative Dentistry, School of Dentistry of Ribeirão Preto, University of São Paulo, Av. Café S/N, Ribeirao Preto, São Paulo, 14040-904, Brazil.
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Alhussain BS, Alshehri AM, Alrasheed MA, Algadhi SK, Alahmad FA. Endodontics Retreatment and Successful Removal of Endodontic Sealers Using Lasers: A Systematic Review. ANNALS OF DENTAL SPECIALTY 2022. [DOI: 10.51847/ekiqcpebrz] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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Eldeeb IM, Nawar NN, Saber SM, Hassanein EES, Schäfer E. Smear layer removal and sealer penetration with different tapers after using photon-initiated photoacoustic streaming technique. Clin Oral Investig 2021; 25:5025-5032. [PMID: 33538899 DOI: 10.1007/s00784-021-03813-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2020] [Accepted: 01/27/2021] [Indexed: 10/22/2022]
Abstract
OBJECTIVE To evaluate the effect of the photon-initiated photoacoustic streaming (PIPS) technique on irrigation performance with different instrumentation tapers in root canals regarding smear layer removal and subsequent sealer penetration. MATERIALS AND METHODS One hundred twenty human mandibular molars were divided into three equal groups according to the apical preparation taper (25/4%, 25/6%, and 25/8%). Each group was divided into two equal subgroups, one received passive irrigation (PI) while the other received PIPS activation of 2.5% sodium hypochlorite and 17% EDTA. Half the samples were evaluated using electron microscope images to assess smear layer removal. The other half was obturated using gutta-percha and rhodamine B-labeled AH Plus sealer before being sectioned horizontally at different root levels (coronal, middle, and apical) to evaluate the percentage of sealer penetration using CLSM. Mann-Whitney U and Friedman tests were used to analyze smear layer scores, while sealer penetration data were analyzed using the three-way analysis of variance (ANOVA) and Tukey's post hoc test. RESULTS Statistical analysis showed significantly better smear layer removal and better sealer penetration after PIPS activation when corresponding root thirds were compared (P<0.001). Only exception was sealer penetration in the apical third with root canal preparation of 25/4% where the difference between the irrigation methods was statistically insignificant (P>0.05). CONCLUSIONS The use of PIPS activation in the final irrigation protocol enhanced smear layer removal and sealer penetration into dentinal tubules if the taper of the prepared canal was at least 6%. CLINICAL RELEVANCE Increasing apical preparation taper significantly enhances PIPS performance in terms of irrigation activation thus enhancing smear layer removal and subsequent sealer penetration in dentinal tubules.
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Affiliation(s)
| | - Nawar Naguib Nawar
- Department of Endodontics, Faculty of Dentistry, The British University, 81-11-11 El-Rehab, Cairo, 11841, Egypt
| | - Shehabeldin Mohamed Saber
- Department of Endodontics, Ain Shams University, Cairo, Egypt. .,Department of Endodontics, Faculty of Dentistry, The British University, 81-11-11 El-Rehab, Cairo, 11841, Egypt.
| | | | - Edgar Schäfer
- Central Interdisciplinary Ambulance in the School of Dentistry, University of Münster, Münster, Germany
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Campi LB, Lopes FC, Soares LES, de Queiroz AM, de Oliveira HF, Saquy PC, de Sousa-Neto MD. Effect of radiotherapy on the chemical composition of root dentin. Head Neck 2018; 41:162-169. [PMID: 30552849 DOI: 10.1002/hed.25493] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2017] [Revised: 02/23/2018] [Accepted: 07/06/2018] [Indexed: 01/22/2023] Open
Abstract
BACKGROUND The radiotherapy can directly affect the bond strength of the adhesive materials, interfering in the prognosis of restorative treatments, which may be caused by chemical changes in dentin structure. METHODS Twenty inferior homologues premolars were distributed in 2 groups (in vitro study) (n = 10): nonirradiated and irradiated. The specimens were submitted to the analysis of phosphate (ν1 PO4 3- ;ν2 PO4 3- ;ν4 PO4 3- ), carbonate (ν3 CO3 2- ), amide I, CH2 , amide III, and amide I/III ratio by confocal Raman spectroscopy. Data were submitted to statistical analysis (T test, P < .05). RESULTS In intracanal dentin, the irradiated group had lower ν4 PO4 3- values (1.23 ± 0.06) compared to nonirradiated group (1.40 ± 0.18) (P < .05), with no difference for ν1 PO4 3- and ν2 PO4 3 peaks (P > .05). The irradiated (1.56 ± 0.06) had lower carbonate, amide III (1.05 ± 0.19), and amide I/III ratio values (0.19 ± 0.06) compared to nonirradiated group (1.42 ± 0.10, 1.28 ± 0.24, and 0.31 ± 0.10, respectively) (P < .05). For medium dentin irradiated group (1.30 ± 0.12) had lower phosphate values compared to nonirradiated group (1.48 ± 0.22) (P < .05). In cementum, there was no statistical difference between the groups. CONCLUSION The radiotherapy was able to cause changes in ν4 PO4 3- , carbonate, and amide III peaks of root dentin.
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Affiliation(s)
- Lívia Bueno Campi
- Department of Restorative Dentistry, School of Dentistry of Ribeirão Preto, University of São Paulo, Ribeirão Preto, São Paulo, Brazil
| | - Fabiane Carneiro Lopes
- Department of Restorative Dentistry, School of Dentistry of Ribeirão Preto, University of São Paulo, Ribeirão Preto, São Paulo, Brazil
| | - Luís Eduardo Silva Soares
- Laboratory of Dentistry and Applied Materials (LDAM), Research and Development Institute (IP&D), Universidade do Vale do Paraíba, Univap, São José dos Campos, São Paulo, Brazil
| | - Alexandra Mussolino de Queiroz
- Department Children's Clinic, School of Dentistry of Ribeirão Preto, University of São Paulo, Ribeirão Preto, São Paulo, Brazil
| | - Harley Francisco de Oliveira
- Medical Clinic Department, Medical School of Ribeirão Preto, University of São Paulo, Ribeirão Preto, São Paulo, Brazil
| | - Paulo César Saquy
- Department of Restorative Dentistry, School of Dentistry of Ribeirão Preto, University of São Paulo, Ribeirão Preto, São Paulo, Brazil
| | - Manoel Damião de Sousa-Neto
- Department of Restorative Dentistry, School of Dentistry of Ribeirão Preto, University of São Paulo, Ribeirão Preto, São Paulo, Brazil
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Zabeu GS, Maenossono RM, Scarcella CR, Brianezzi LFF, Palma-Dibb RG, Ishikiriama SK. Effect of diode laser irradiation on the bond strength of polymerized non-simplified adhesive systems after 12 months of water storage. J Appl Oral Sci 2018; 27:e20180126. [PMID: 30540073 PMCID: PMC6296358 DOI: 10.1590/1678-7757-2018-0126] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2018] [Accepted: 06/25/2018] [Indexed: 01/26/2023] Open
Abstract
Objectives: The aim of this in vitro study was to evaluate the bonding strength of non-simplified dentin bonding systems (DBS) to dentin irradiated with a diode laser (970 nm) immediately and after 12 months of water storage following either primer or bond application. Material and methods: The experimental design included three different factors: DBS type [AdperTM Scotchbond Multipurpose (MP) and Clearfil™ SE Bond (CSE)], irradiation [without irradiation - control (C), irradiation after primer application (AP), and irradiation after bond application (AB)], and time [initial (I) and after 12 months of water storage (12 m)]. Sixty sound human third molars (n = 10) were obtained, and their flat occlusal dentin areas were prepared and standardized. Laser irradiation was performed in the contact mode perpendicular to the dental surface over an automatically selected scanning area at a pulse energy of 0.8 W, frequency of 10 Hz, and energy density of 66.67 J/cm2. After 7 days of treatment, the specimens were cut, and half of them were subjected to microtensile testing (500 N/0.05 mm/min), whereas the remaining sticks were examined after 12 months of water storage. The obtained data were analyzed by three-way analysis of variance (ANOVA) followed by a Tukey test (p<0.05). The observed fracture modes were investigated using a portable digital microscope with a magnification of 40x. Results: Among the utilized DBS, MP generally exhibited higher bond strengths, but did not always differ from CSE under similar conditions. The irradiation factor was statistically significant only for the MP/AB groups. After 12 months of storage, all groups demonstrated a significant reduction in the bond strength, whereas the results of fracture analysis showed a predominance of the adhesive type. Conclusions: The laser treatment of non-simplified DBS was not able to stabilize their bonding characteristics after 12 months.
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Affiliation(s)
- Giovanna Speranza Zabeu
- Universidade de São Paulo, Faculdade de Odontologia de Bauru, Departamento de Dentística, Endodontia e Materiais Odontológicos, Bauru, São Paulo, Brasil
| | - Rafael Massunari Maenossono
- Universidade de São Paulo, Faculdade de Odontologia de Bauru, Departamento de Dentística, Endodontia e Materiais Odontológicos, Bauru, São Paulo, Brasil.,Fundação Municipal de Educação e Cultura de Santa Fé do Sul, Departamento de Dentística, Santa Fé do Sul, São Paulo, Brasil
| | - Caren Roberta Scarcella
- Universidade de São Paulo, Faculdade de Odontologia de Bauru, Departamento de Dentística, Endodontia e Materiais Odontológicos, Bauru, São Paulo, Brasil
| | - Letícia Ferreira Freitas Brianezzi
- Universidade de São Paulo, Faculdade de Odontologia de Bauru, Departamento de Dentística, Endodontia e Materiais Odontológicos, Bauru, São Paulo, Brasil.,Instituto Chaddad de Ensino, Faculdade do Sudoeste Paulista, Departamento de Dentística, Avaré, São Paulo, Brasil
| | - Regina Guenka Palma-Dibb
- Universidade de São Paulo, Faculdade de Odontologia de Ribeirão Preto, Departamento de Odontologia Restauradora, Ribeirão Preto, São Paulo, Brasil
| | - Sérgio Kiyoshi Ishikiriama
- Universidade de São Paulo, Faculdade de Odontologia de Bauru, Departamento de Dentística, Endodontia e Materiais Odontológicos, Bauru, São Paulo, Brasil
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Lopes FC, Roperto R, Akkus A, Silva Sousa YTC, Sousa-Neto MD. Evaluation of chemical and morphological changes in radicular dentin after different final surface treatments. Microsc Res Tech 2018; 81:973-979. [PMID: 30295342 DOI: 10.1002/jemt.23060] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2017] [Revised: 03/30/2018] [Accepted: 05/07/2018] [Indexed: 11/11/2022]
Abstract
The aim of this study was to evaluate the chemical and morphological effects of different lasers as a final surface treatment for endodontic therapy through energy dispersive X-ray spectroscopy (EDS) and scanning electron microscopy (SEM) respectively. Twenty-five maxillary canines were selected and instrumented with K3 system. Roots were randomly distributed into five groups (n = 5) according to the surface treatment: GI (distilled water), GII (NaOCl + EDTA), GIII (NaOCl + EDTA + 980 nm diode laser), GIV (NaOCl + EDTA+ 1,064 nm Nd:YAG laser), and GV (NaOCl + EDTA+ 2,780 nm Er, Cr:YSGG laser). Lasers were applied for 20 s and samples were bisected, exposing the treated surface and then subjected to elements quantification by EDS and morphological evaluation by scanning electron microscope (SEM). EDS data were submitted to ANOVA-two way, and SEM scores were submitted to two-way Kruskal-Wallis and Dunn's tests. The EDS analysis showed no difference for the chemical elements and Ca/P ratio between groups (p > .05). Statistical analysis showed more intense results for GV and less intense results for GI (p < .05). The GIII showed an amorphous organic matrix surface, while GV provided greater removal of intertubular dentin forming craters, and GIV promoted dentin fusion. The EDS method used in this study was not able to verify any chemical changes in root canal dentin; Nd:YAG, Er, Cr:YSGG, and 980 nm diode laser were capable of modifying the dentin morphology, correlating characteristics features for each one, which are essential clinical knowledge to establish the correct indication for each case. RESEARCH HIGHLIGHTS: EDS was not able to verify any chemical changes in root canal dentin after 980 nm diode, Nd:YAG and Er;Cr:YSGG laser treatments Nd:YAG, Er, Cr:YSGG, and 980 nm diode laser modified dentin morphology, correlating characteristics features for each one.
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Affiliation(s)
- Fabiane Carneiro Lopes
- Department of Restorative Dentistry, School of Dentistry of Ribeirão Preto, University of São Paulo - USP, Ribeirão Preto, SP, Brazil
| | - Renato Roperto
- Department of Comprehensive Care, School of Dental Medicine, Case Western Reserve University - CWRU, Cleveland, Ohio
| | - Anna Akkus
- Department of Comprehensive Care, School of Dental Medicine, Case Western Reserve University - CWRU, Cleveland, Ohio.,School of Engineering, Department of Macromolecular Science and Engineering, Case Western Reserve University - CWRU, Cleveland, Ohio
| | | | - Manoel D Sousa-Neto
- Department of Restorative Dentistry, School of Dentistry of Ribeirão Preto, University of São Paulo - USP, Ribeirão Preto, SP, Brazil
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Pelozo LL, Silva-Neto RD, Corona SAM, Palma-Dibb RG, Souza-Gabriel AE. Dentin pretreatment with Er:YAG laser and sodium ascorbate to improve the bond strength of glass fiber post. Lasers Med Sci 2018; 34:47-54. [DOI: 10.1007/s10103-018-2579-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2018] [Accepted: 06/29/2018] [Indexed: 12/13/2022]
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Lopes FC, Roperto R, Akkus A, Akkus O, Palma-Dibb RG, de Sousa-Neto MD. Effect of laser activated bleaching on the chemical stability and morphology of intracoronal dentin. Arch Oral Biol 2018; 86:40-45. [DOI: 10.1016/j.archoralbio.2017.10.023] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2016] [Revised: 10/11/2017] [Accepted: 10/28/2017] [Indexed: 10/18/2022]
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Effect of different diode laser wavelengths on root dentin decontamination infected with Enterococcus faecalis. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2017; 176:1-8. [DOI: 10.1016/j.jphotobiol.2017.09.009] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/27/2017] [Revised: 08/25/2017] [Accepted: 09/11/2017] [Indexed: 01/15/2023]
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Akkus A, Karasik D, Roperto R. Correlation between micro-hardness and mineral content in healthy human enamel. J Clin Exp Dent 2017; 9:e569-e573. [PMID: 28469825 PMCID: PMC5410680 DOI: 10.4317/jced.53345] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2016] [Accepted: 07/18/2016] [Indexed: 11/05/2022] Open
Abstract
BACKGROUND Enamel is the hardest and the stiffest tissue in the human body. The enamel undergoes multidirectional stresses, withstands multimillion chewing cycles, all while protecting the internal dentin and pulp from damage due to mechanical overload and exposure to the harsh chemical environment of the mouth. Raman spectroscopy allows to study enamel mineral content in a non-destructive and site-specific way. While Raman spectroscopy has been applied in other studies to assess tooth mineralization, there are no studies that examine the relationship between micro-hardness and mineral content of the untreated enamel. An understanding of this relationship is extremely important in a clinical context. The effect of various agents on enamel hardness was investigated, though the relationship between healthy enamel mineral content and micro-hardness remains obscure. MATERIAL AND METHODS Twenty human incisor teeth were obtained in compliance with the NIH guidelines and imaged site-specifically with a Raman microscope and evaluated with a Brinell hardness measurement device. The front portion of each tooth was divided into apical, medium and cervical regions and subsequently imaged with a Raman microscope in these three locations. RESULTS AND CONCLUSIONS The results demonstrated that enamel mineral content varies significantly between individuals and is correlated with the hardness of the enamel. Non-invasive, sample preparation free Raman spectroscopy was successfully employed to measure the mineral content of healthy enamel and it correlated the mineralization score to the hardness measurements of the selected cervical location. The overall level of enamel mineral content may serve as a robust predictor of patients' susceptibility to developing caries, and overall enamels wear resistance, thus allowing for the prevention of caries via clinically available methods of remineralization, fluoride treatment and frequent cleaning. Key words:Enamel, raman spectroscopy, micro-hardness, extracted teeth.
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Affiliation(s)
- Anna Akkus
- Department of Comprehensive Care, Case Western Reserve University, Cleveland, Ohio 44106, USA
| | | | - Renato Roperto
- Department of Comprehensive Care, Case Western Reserve University, Cleveland, Ohio 44106, USA
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Macedo HSD, Messias DCF, Rached-Júnior FJ, Oliveira LTD, Silva-Sousa YTC, Raucci-Neto W. 1064-nm Nd:YAG and 980-nm Diode Laser EDTA Agitation on the Retention of an Epoxy-Based Sealer to Root Dentin. Braz Dent J 2016; 27:424-9. [PMID: 27652705 DOI: 10.1590/0103-6440201601006] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2016] [Accepted: 07/01/2016] [Indexed: 11/22/2022] Open
Abstract
Root canal irrigants are used to minimize the negative effects of smear layer on endodontic sealer retention. The aim of this study was to evaluate the efficacy of agitation of 17% ethylenediaminetetraacetic acid (EDTA) with ultrasonic, 1064-nm Nd:YAG and 980-nm diode laser on the retention of an epoxy-based sealer to the root canal walls. Forty single-rooted bovine teeth were instrumented with ProTaper rotary system and divided into four groups according to the final irrigation protocol (n = 10): (1) 17% EDTA (control); (2) 17% EDTA with 50-s ultrasonic agitation; (3) 17% EDTA with 50-s diode laser (2-W) agitation; and (4) 17% EDTA with 50-s Nd:YAG (1.5-W) laser agitation. After endodontic filling with gutta-percha F5 master cone and Sealer 26, the roots were sectioned at the cervical, middle, and apical root thirds to obtain 1.5-mm slices. Push-out tests were performed using a universal testing machine at a 1 mm/min crosshead speed. Data were analyzed using two-way ANOVA and Tukey's tests (α=0.05). Apical root thirds had significant higher retention values than cervical and middle thirds (p < 0.05). EDTA with 1064-nm Nd:YAG or 980-nm diode laser presented the highest retention values and was significantly different from EDTA with ultrasonic agitation and EDTA only (p < 0.05). Adhesive failures were predominant to EDTA only group. Mixed failures were predominant to all agitation groups. 1064-nm Nd:YAG and 980-nm diode laser EDTA agitation enhanced the retention of the epoxy-based sealer to the root canal walls compared with that due to EDTA only or EDTA with ultrasonic agitation.
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