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Martinho FC, Camargo SEA, Fernandes AMM, Campos MS, Prado RF, Camargo CHR, Valera MC. Comparison of cytotoxicity, genotoxicity and immunological inflammatory biomarker activity of several endodontic sealers against immortalized human pulp cells. Int Endod J 2017; 51:41-57. [DOI: 10.1111/iej.12785] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2017] [Accepted: 04/20/2017] [Indexed: 01/08/2023]
Affiliation(s)
- F. C. Martinho
- Department of Restorative Dentistry Endodontic Division São José dos Campos Dental School Paulista State University (UNESP) São José dos Campos, São Paulo Brazil
| | - S. E. A. Camargo
- Department of Bioscience and Oral Diagnosis Biochemistry Division São José dos Campos Dental School Paulista State University (UNESP) São José dos Campos, São Paulo Brazil
| | - A. M. M. Fernandes
- Department of Restorative Dentistry Endodontic Division São José dos Campos Dental School Paulista State University (UNESP) São José dos Campos, São Paulo Brazil
| | - M. S. Campos
- Department of Oral Pathology Radiology & Medicine College of Dentistry University of Iowa Iowa City IA USA
| | - R. F. Prado
- Department of Restorative Dentistry Endodontic Division São José dos Campos Dental School Paulista State University (UNESP) São José dos Campos, São Paulo Brazil
| | - C. H. R. Camargo
- Department of Restorative Dentistry Endodontic Division São José dos Campos Dental School Paulista State University (UNESP) São José dos Campos, São Paulo Brazil
| | - M. C. Valera
- Department of Restorative Dentistry Endodontic Division São José dos Campos Dental School Paulista State University (UNESP) São José dos Campos, São Paulo Brazil
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Palo RM, Bonetti-Filho I, Valera MC, Camargo CHR, Camargo SEA, Moura-Netto C, Pameijer C. Quantification of Peroxide Ion Passage in Dentin, Enamel, and Cementum After Internal Bleaching With Hydrogen Peroxide. Oper Dent 2012; 37:660-4. [DOI: 10.2341/11-334-l] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
SUMMARY
The aim of this study was to evaluate the amount of peroxide passage from the pulp chamber to the external enamel surface during the internal bleaching technique. Fifty bovine teeth were sectioned transversally 5 mm below the cemento-enamel junction (CEJ), and the remaining part of the root was sealed with a 2-mm layer of glass ionomer cement. The external surface of the samples was coated with nail varnish, with the exception of standardized circular areas (6-mm diameter) located on the enamel, exposed dentin, or cementum surface of the tooth. The teeth were divided into three experimental groups according to exposed areas close to the CEJ and into two control groups (n=10/group), as follows: GE, enamel exposure area; GC, cementum exposed area; GD, dentin exposed area; Negative control, no presence of internal bleaching agent and uncoated surface; and Positive control, pulp chamber filled with bleaching agent and external surface totally coated with nail varnish. The pulp chamber was filled with 35% hydrogen peroxide (Opalescence Endo, Ultradent). Each sample was placed inside of individual flasks with 1000 μL of acetate buffer solution, 2 M (pH 4.5). After seven days, the buffer solution was transferred to a glass tube, in which 100 μL of leuco-crystal violet and 50 μL of horseradish peroxidase were added, producing a blue solution. The optical density of the blue solution was determined by spectrophotometer and converted into microgram equivalents of hydrogen peroxide. Data were submitted to Kruskal-Wallis and Dunn-Bonferroni tests (α=0.05). All experimental groups presented passage of peroxide to the external surface that was statistically different from that observed in the control groups. It was verified that the passage of peroxide was higher in GD than in GE (p<0.01). The GC group presented a significantly lower peroxide passage than did GD and GE (p<0.01). It can be concluded that the hydrogen peroxide placed into the pulp chamber passed through the dental hard tissues, reaching the external surface and the periodontal tissue. The cementum surface was less permeable than were the dentin and enamel surfaces.
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Affiliation(s)
- RM Palo
- Renato Miotto Palo, DDS, MsC, PhD, professor of endodontics, UNESP–Univ Estadual Paulista, São José dos Campos, SP, Brazil
| | - I Bonetti-Filho
- Idomeo Bonetti-Filho, DDS, MsC, PhD, associate professor of endodontics, UNESP–Univ Estadual Paulista, Araraquara, SP, Brazil
| | - MC Valera
- Marcia Carneiro Valera, DDS, MsC, PhD, associate professor of endodontics, UNESP–Univ Estadual Paulista, São José dos Campos, SP, Brazil
| | - CHR Camargo
- Carlos Henrique Ribeiro Camargo, DDS, MsC, PhD, associate professor of endodontics, UNESP–Univ Estadual Paulista, São José dos Campos, SP, Brazil
| | - SEA Camargo
- Carlos Henrique Ribeiro Camargo, DDS, MsC, PhD, associate professor of endodontics, UNESP–Univ Estadual Paulista, São José dos Campos, SP, Brazil
| | - C Moura-Netto
- Cacio Moura-Netto, DDS, MsC, PhD, professor of endodontics, Universidade Paulista–UNIP, São Paulo, SP, Brazil
| | - C Pameijer
- Cornelis Pameijer, DDS, DSc, PhD, professor emeritus, University of Connecticut, Farmington, CT, USA
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Valera MC, Salvia ACRD, Maekawa LE, Camargo SEA, Carvalho CAT, Camargo CHR, Koga-Ito CY. Antimicrobial analysis of chlorhexidine gel and intracanal medicaments against microorganisms inoculated in root canals. Minerva Stomatol 2010; 59:415-421. [PMID: 20842079] [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] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
AIM The aim of this paper was to evaluate the antimicrobial activity of 2% chlorhexidine gel (CLX) associated with various intracanal medicaments against Candida albicans and Enterococcus faecalis inoculated in root canals. METHODS Thirty six human single-rooted teeth were contaminated with C.albicans and E.faecalis. The canals were instrumented using 2% CLX gel and were divided into three groups according to the intracanal medicaments (ICM) used. Group 1: calcium hydroxide paste [Ca(OH)₂], Group 2: 2% chlorhexidine gel (CLX) and Group 3: 2% CLX gel + Ca(OH)₂. The root canal collections were performed after 21 days of contamination (control collection), after instrumentation (1st collection), after 14 days of intracanal medicament (2nd collection) and 7 days after medicament removal (3rd collection). The microbiological samples were plated in culture media and incubated for 48 hours. The results were submitted to Kruskal-Wallis test (P ≤ 0.05). RESULTS It was verified that the instrumentation with CLX reduced the number of CFU/ml significantly when compared with the confirmation collection (control). However, the use of the ICM was only capable to eliminate completely the microorganisms in the root canals without difference statistics between them. CONCLUSION Although the use of 2% chlorherixidine gel reduces the number of microorganisms significantly, only the ICM calcium hydroxide and calcium hydroxide associated with chlorhexidine are able to eliminate these microorganisms completely.
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Affiliation(s)
- M C Valera
- Department of Restorative Dentistry, São Paulo State University-UNESP, São José dos Campos, São Paulo, Brazil.
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Abstract
The purpose of this study was to evaluate in vitro the efficacy of root reinforcements by light-cured composite resin or zirconium fiber post in simulated immature non-vital teeth. Fifty-six bovine incisors teeth were used for this study. The crown of each tooth was removed in the medium third to obtain a standard length of 30 mm. The specimens were divided into four groups (n = 14): G1) the root canals were instrumented and enlarged to simulate immature non-vital teeth and were reinforced with a light-cured composite resin using a translucent curing post (Luminex system); (G2) the specimens were instrumented, enlarged and they received root reinforcement with zirconium fiber post; G3 (positive control): they received similar treatment to the G1 and G2 groups, but did not receive root reinforcement; G4 (negative control): the roots were not weakened and did not receive reinforcement. Every tooth was submitted to compressive force using an Instron testing machine with an angle of 45 degrees at a speed of 1 mm min(-1) until the fracture. The results showed a markedly increased resistance to fracture in the G1 and G2 (122.38 and 122.08 kg f, respectively). Among the results of G1 and G2 there was not any significant difference (P > 0.05) but they were significantly different from the control groups (P < 0.05). The conclusion is that the use of root reinforcements with zirconium fiber post or composite resin can increase significantly the structural resistance of the weakened teeth, decreasing the risk of the fracture.
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Affiliation(s)
- C A T Carvalho
- Department of Endodontics, School of Dentistry, Paulista State University-UNESP, Sao Jose dos Campos, SP, Brazil.
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Oliveira LD, Leão MVP, Carvalho CAT, Camargo CHR, Valera MC, Jorge AOC, Unterkircher CS. In vitro effects of calcium hydroxide and polymyxin B on endotoxins in root canals. J Dent 2005; 33:107-14. [PMID: 15683891 DOI: 10.1016/j.jdent.2004.08.008] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2004] [Revised: 08/10/2004] [Accepted: 08/13/2004] [Indexed: 11/24/2022] Open
Abstract
OBJECTIVES To evaluate the effects of intracanal medicaments on endotoxins in root canals. METHODS Seventy-five freshly extracted maxillary incisors were used in this study. The crowns of teeth were sectioned near the CEJ in order to standardize the root length to 14 mm. The root canals were instrumented to an apical size #50 file and irrigated with 1% sodium hypochlorite solution and sterilized with 60Co gamma irradiation. Standardized suspension containing Escherichia coli endotoxin was inoculated into the 60 root canals. The specimens were randomly assigned to 5 groups (n=15), according to the intracanal medicament used: (G1) calcium hydroxide; (G2) polymyxin B; (G3) combination neomycin-polymyxin B-hydrocortisone; (G4) positive control (no intracanal medicament); (G5) negative control (no endotoxin and no intracanal medicament). After 7 days, the detoxification of endotoxin was evaluated by Limulus lysate assay and antibody production in B-lymphocytes culture. RESULTS Groups 1, 2 and 5 presented the best results by Limulus lysate and were significantly different to groups 3 and 4 (p<0.05). Stimulation of antibodies production in cell culture by groups 1 and 6 was smaller and statistically different than groups 2, 3, 4 and 5 (p<0.05). Groups 2 and 5 induced a small increase in the antibodies production in relation to the groups 1 and 6. Groups 3 and 4 induced a significant increase of antibodies production (p<0.05). CONCLUSIONS The calcium hydroxide and polymyxin B intracanal medicaments detoxified endotoxin in root canals and altered the properties of LPS to stimulate the antibody production by B-lymphocytes. The combination neomycin-polymyxin B-hydrocortisone did not detoxified endotoxin.
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Affiliation(s)
- L D Oliveira
- Department of Oral Biosciences and Diagnosis, School of Dentistry, Paulista State University-UNESP, Av. Eng. Francisco José Longo 777, São José dos Campos 12245-000, SP Brazil.
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Menezes MM, Valera MC, Jorge AOC, Koga-Ito CY, Camargo CHR, Mancini MNG. In vitro evaluation of the effectiveness of irrigants and intracanal medicaments on microorganisms within root canals. Int Endod J 2004; 37:311-9. [PMID: 15086752 DOI: 10.1111/j.0143-2885.2004.00799.x] [Citation(s) in RCA: 81] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
AIM To evaluate in vitro the effectiveness of sodium hypochlorite (NaOCl), chlorhexidine (CHX) and five intracanal medicaments on microorganisms within root canals. METHODOLOGY Ninety-six human single-rooted extracted teeth were used. After removing the crowns, canal preparation was completed and the external root surfaces were coated with epoxy resin. Following sterilization, the teeth were contaminated with Candida albicans and Enterococcus faecalis, and were incubated at 37 +/- 1 degrees C for 7 days. The teeth were divided according to the irrigant solution or intracanal medicament: group 1, sterile physiologic solution (SPS) and calcium hydroxide (Ca(OH)2) paste; group 2, SPS and camphorated paramonochlorophenol (CPMC); group 3, SPS and tricresol formalin; group 4, SPS and CaOH2 + CPMC paste; group 5, SPS and PMC furacin; group 6, 2.5% NaOCl without intracanal medication; group 7, 2.0% CHX without intracanal medication and group 8, SPS without intracanal medication (control group). Microbiological samples were collected with sterile paper points, and bacterial growth was determined. The data were submitted to the analysis of variance (anova, P = 0.05). RESULTS For C. albicans, groups 3 and 8 were statistically less effective than groups 1, 2, 4 and 5 (Kruskal-Wallis (K-W) = 65.241; gl = 7; P = 0.001). For E. faecalis, groups 6 and 8 were statistically less effective than groups 1-4 and 7 (K-W = 61.048; gl = 7; P = 0.001). CONCLUSIONS Ca(OH)2 + CPMC paste was the most effective intracanal medicament for the elimination of the two microorganisms; 2.0% CHX solution was more effective than 2.5% NaOCl against E. faecalis.
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Affiliation(s)
- M M Menezes
- Department of Restorative Dentistry, São José dos Campos School of Dentistry, Paulista State University (UNESP), São José dos Campos, SP, Brazil.
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