1
|
Bilge K, Ataş O, Yildiz Ş, Çalik I, Dündar S, Gezer Ataş A. Histological evaluation of tissue reaction and new bone formation of different calcium silicate-based cements in rats. Aust Dent J 2024; 69:18-28. [PMID: 37715562 DOI: 10.1111/adj.12980] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/31/2023] [Indexed: 09/17/2023]
Abstract
BACKGROUND The purpose of this study was to evaluate the local reactions and new bone formation of rat subcutaneous and bone tissue to different calcium silicate cements. METHODS In this study, 80 rats were divided into five groups as control, BIOfactor MTA (BIO), NeoMTA Plus (NEO), MTA Repair Hp (REP), Biodentine (DENT) and then into two subgroups according to sacrification times (7, 30 days; n = 8). Polyethylene tubes filled with appropriate materials (test groups); empty tubes (control group) were implanted into the dorsum of each rat subcutaneously. For intraosseous implantation, materials were placed in the cavities created in tibia of rats. Subcutaneous tissue and tibia samples were stained with haematoxylin-eosin and subjected to histopathological analysis. A score (0-3) was used to grade inflammatory reaction and new bone formation. Data were analysed by Kruskal-Wallis and Mann-Whitney U tests (P < 0.05). RESULTS Inflammatory reaction observed in subcutaneous and intraosseous tissues for 7 days decreased significantly in all groups over time (P < 0.05). It was determined that there was significant increase in new bone formation in REP, BIO, DENT groups over time (P < 0.05). CONCLUSION Four contemporary bioceramic materials induced local inflammation and tissues changes shortly after subcutaneous implantation, which were reduced over time. In ıntraosseous implantation, all materials induced new bone formation over time. REGISTRATION NUMBER ADJ-03-23-0134. © 2023 Australian Dental Association.
Collapse
Affiliation(s)
- K Bilge
- Department of Restorative Dentistry, Faculty of Dentistry Firat University, Elazıg, Turkey
| | - O Ataş
- Department of Pediatric Dentistry, Faculty of Dentistry Firat University, Elazıg, Turkey
| | - Ş Yildiz
- Department of Pediatric Dentistry, Faculty of Dentistry Firat University, Elazıg, Turkey
| | - I Çalik
- Department of Pathology, Faculty of Medicine, Firat University, Elazıg, Turkey
| | - S Dündar
- Department of Periodontology, Faculty of Dentistry, Firat University, Elazig, Turkey
| | | |
Collapse
|
2
|
Martins JFB, Scheeren B, van der Waal SV. The Effect of Unintentional AH-Plus Sealer Extrusion on Resolution of Apical Periodontitis After Root Canal Treatment and Retreatment-A Retrospective Case-control Study. J Endod 2023; 49:1262-1268. [PMID: 37516239 DOI: 10.1016/j.joen.2023.07.021] [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: 05/23/2023] [Revised: 07/19/2023] [Accepted: 07/20/2023] [Indexed: 07/31/2023]
Abstract
INTRODUCTION This study aimed to investigate the effect of unintentional AH Plus sealer extrusion on the outcome of nonsurgical root canal treatment and retreatment in teeth with apical periodontitis (AP) compared to teeth with AP and no sealer extrusion at the 1-year follow-up. METHODS In a retrospective case-control study conducted from September 2016 to September 2021, teeth presenting clinical and radiographic signs of AP prior to treatment were included. The study comprised 2 groups: AH Plus sealer extrusion group (n = 60): initial root canal treatment or nonsurgical retreatment with unintentional apical extrusion of AH Plus sealer; and no AH Plus sealer extrusion group (n = 60): underwent the same treatment types without sealer extrusion. Additional factors, including sex, age, tooth type, tooth location, and treatment type, were recorded as potential outcome predictors. At 1-year follow-up, teeth were evaluated clinically and radiographically, and outcomes were classified as favorable (healed/healing) or unfavorable (uncertain/non-healing). Statistical analyses, such as the χ2 test, logistic regression, and Mann-Whitney U test, were employed for data analysis. RESULTS A favorable outcome was observed in 88.4% and 85% of the cases of the AH Plus sealer extrusion and no AH Plus sealer extrusion groups, respectively. There was no statistically significant difference between the groups in terms of outcomes (P > .05) when analyzed categorically or ordinally. Of independent variables, nonsurgical retreatment showed lower healing of AP in both groups. CONCLUSIONS Unintentional AH Plus sealer extrusion did not affect the healing of AP. However, initial root canal treatment showed better healing of AP than nonsurgical retreatment in the presence of AH Plus sealer extrusion. The analyzed outcome predictors had no effect on treatment outcome.
Collapse
Affiliation(s)
- J F Brochado Martins
- Departments of Preventive Dentistry and Endodontology, Academic Centre for Dentistry, Amsterdam, the Netherlands.
| | - B Scheeren
- Departments of Preventive Dentistry and Endodontology, Academic Centre for Dentistry, Amsterdam, the Netherlands
| | - S V van der Waal
- Departments of Preventive Dentistry and Endodontology, Academic Centre for Dentistry, Amsterdam, the Netherlands
| |
Collapse
|
3
|
Erdogan H, Yildirim S, Cobankara FK. Cytotoxicity and genotoxicity of salicylate- and calcium silicate-based root canal sealers on primer human periodontal ligament fibroblasts. AUST ENDOD J 2021; 47:645-653. [PMID: 34097343 DOI: 10.1111/aej.12537] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2021] [Revised: 05/11/2021] [Accepted: 05/17/2021] [Indexed: 11/29/2022]
Abstract
The aim of this study was to evaluate the biocompatibility of epoxy-resin-based AHPlus, salicylate-based MTA-Fillapex and calcium silicate-based iRootSP root canal sealers. Cytotoxicity was assessed by XTT test. The extracts from sealers of different setting times were serially diluted. Cell viability was calculated as the percentage of the control group (100%). The optimal concentration of each sealer was used at genotoxicity test, and micronuclei formations were detected. Statistical analyses were done by using Kruskal-Wallis and Dunn post hoc test with Bonferroni correction. AHPlus and MTA-Fillapex showed the lowest percentage of cell viability at higher concentrations (1:1, 1:2, 1:4), especially at first 12 h. iRootSP showed higher viability at all concentrations and times than AHPlus and MTA-Fillapex. At genotoxicity assay, AHPlus increased the number of micronuclei. MTA-Fillapex slightly induced micronucleus formation (not significant) and iRootSP was not increased. In conclusion, calcium silicate-based iRootSP had lowest cytotoxic and genotoxic potential and can be considered as a highly biocompatible material.
Collapse
Affiliation(s)
- Hilal Erdogan
- Department of Endodontics, Faculty of Dentistry, Nevsehir Haci Bektas Veli University, Nevsehir, Turkey
| | - Sibel Yildirim
- Department of Pediatric Dentistry, Faculty of Dentistry, Selcuk University, Konya, Turkey
| | - Funda Kont Cobankara
- Department of Endodontics, Faculty of Dentistry, Selcuk University, Konya, Turkey
| |
Collapse
|
4
|
Brezhnev A, Neelakantan P, Tanaka R, Brezhnev S, Fokas G, Matinlinna JP. Antibacterial Additives in Epoxy Resin-Based Root Canal Sealers: A Focused Review. Dent J (Basel) 2019; 7:E72. [PMID: 31266165 PMCID: PMC6784478 DOI: 10.3390/dj7030072] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2019] [Revised: 05/31/2019] [Accepted: 06/05/2019] [Indexed: 01/16/2023] Open
Abstract
Dental materials used in root canal treatment have undergone substantial improvements over the past decade. However, one area that still remains to be addressed is the ability of root canal fillings to effectively entomb, kill bacteria, and prevent the formation of a biofilm, all of which will prevent reinfection of the root canal system. Thus far, no published review has analysed the literature on antimicrobial additives to root canal sealers and their influence on physicochemical properties. The aim of this paper was to systematically review the current literature on antimicrobial additives in root canal sealers, their anti-fouling effects, and influence on physicochemical properties. A systematic search was performed in two databases (PubMed and Scopus) to identify studies that investigated the effect of antimicrobial additives in epoxy resin-based root canal sealers. The nature of additives, their antimicrobial effects, methods of antimicrobial testing are critically discussed. The effects on sealer properties have also been reviewed. A total of 31 research papers were reviewed in this work. A variety of antimicrobial agents have been evaluated as additives to epoxy resin-based sealers, including quaternary ammonium compounds, chlorhexidine, calcium hydroxide, iodoform, natural extracts, antibiotics, antifungal drugs, and antimicrobial agent-functionalised nanoparticles. Antimicrobial additives generally improved the antimicrobial effect of epoxy resin-based sealers mainly without deteriorating the physicochemical properties, which mostly remained in accordance with ISO and ANSI/ADA specifications.
Collapse
Affiliation(s)
- Alexander Brezhnev
- Applied Oral Sciences-Dental Materials Science, Faculty of Dentistry, The University of Hong Kong, Hong Kong, China
| | - Prasanna Neelakantan
- Discipline of Endodontology, Faculty of Dentistry, The University of Hong Kong, Hong Kong, China.
| | - Ray Tanaka
- Applied Oral Sciences-Oral and Maxillofacial Radiology, Faculty of Dentistry, The University of Hong Kong, Hong Kong, China
| | - Sergey Brezhnev
- Discipline of Endodontology, Faculty of Dentistry, The University of Hong Kong, Hong Kong, China
| | - George Fokas
- Department of Prosthodontics, Faculty of Dentistry, The University of Hong Kong, Hong Kong, China
| | - Jukka P Matinlinna
- Applied Oral Sciences-Dental Materials Science, Faculty of Dentistry, The University of Hong Kong, Hong Kong, China
| |
Collapse
|
5
|
Javidi M, Zarei M, Omidi S, Ghorbani A, Gharechahi M, Shayani Rad M. Cytotoxicity of a New Nano Zinc-Oxide Eugenol Sealer on Murine Fibroblasts. IRANIAN ENDODONTIC JOURNAL 2015; 10:231-5. [PMID: 26525834 PMCID: PMC4609659 DOI: 10.7508/iej.2015.04.004] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Introduction: The aim of this study was to evaluate the cytotoxicity of a new nano zinc-oxide eugenol (NZOE) sealer in comparison with AH-26 and Pulpdent root canal sealers. Methods and Materials: The L929 mouse fibroblast cells were cultivated and incubated for 24, 48 or 72 h with different dilutions (1/1, 1/2, 1/4, 1/8, 1/16 and 1/32) of culture media previously exposed to either of the test sealers naming NZOE, AH-26 or Pulpdent. At the end of incubation period, the effect of sealers on cell viability was evaluated using Mosmann’s Tetrazolium Toxicity (MTT) colorimetric assay. The data was compared using the one-way analysis of variance (ANOVA) followed by the Tukey’s post hoc test for multiple comparisons. Results: After 24, 48 or 72 h, both NZOE and Pulpdent sealers inhibited cell viability at 1/1, 1/2 and 1/8 dilutions. Within the 24 and 48 h, the AH-26 sealer reduced the cell viability at all dilutions except the 1/32 solution; however after 72 h even the 1/32 dilution was cytotoxic. Conclusion: The biocompatibility of the nano zinc-oxide eugenol sealer was comparable to Pulpdent sealer and lower than AH-26.
Collapse
Affiliation(s)
- Maryam Javidi
- Dental Material Research Center, Department of Endodontics, Dental School, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Mina Zarei
- Dental Material Research Center, Department of Endodontics, Dental School, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Salma Omidi
- Department of Endodontics, Dental School, Mazandaran University of Medical Sciences, Sari, Iran
| | - Ahmad Ghorbani
- Pharmacological Research Center of Medicinal Plants, Medical School, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Maryam Gharechahi
- Dental Material Research Center, Department of Endodontics, Dental School, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Maryam Shayani Rad
- Student Research Committee (SRC), Mashhad University of Medical Sciences, Mashhad, Iran
| |
Collapse
|
6
|
Alonso-Ezpeleta O, Martín PJ, López-López J, Castellanos-Cosano L, Martín-González J, Segura-Egea JJ. Pregabalin in the treatment of inferior alveolar nerve paraesthesia following overfilling of endodontic sealer. J Clin Exp Dent 2014; 6:e197-202. [PMID: 24790724 PMCID: PMC4002354 DOI: 10.4317/jced.51420] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2013] [Accepted: 12/23/2013] [Indexed: 11/05/2022] Open
Abstract
A case of orofacial pain and inferior alveolar nerve (IAN) paraesthesia after extrusion of endodontic sealer within the mandibular canal treated with prednisone and pregabalin is described. A 36-year-old woman underwent root canal treatment of the mandibular second right premolar tooth. Post-operative panoramic radiograph revealed the presence of radiopaque canal sealer in the mandibular canal. Damage to IAN consecutive to extrusion of endodontic sealer was diagnosed. Non-surgical management was decided, including: 1 mg/kg/day prednisone 2 times/day, once-daily regimen, and 150 mg/day pregabalin, two doses per day, monitoring the progress with periodic follow-up visits. Six weeks after the incident the signs and symptoms were gone. The complete resolution of paraesthesia and the control of pain achieved suggest that a non-surgical approach, combining prednisone and the GABA analogue pregabalin, is a good option in the management of the IAN damage subsequent to endodontic sealer extrusion. Key words:Endodontics, inferior alveolar nerve, neuropathic pain, orofacial pain, paraesthesia, pregabalin.
Collapse
Affiliation(s)
- Oscar Alonso-Ezpeleta
- Associate Professor. Department of Endodontics, School of Dentistry, University of Zaragoza, 22006-Huesca, Spain
| | - Pablo J Martín
- Doctoral fellow. Department of Stomatology, School of Dentistry, University of Sevilla, C/ Avicena s/n, 41009-Sevilla, Spain
| | - José López-López
- Professor. Department of Odontostomatology, University of Barcelona, Barcelona, Spain
| | - Lizett Castellanos-Cosano
- Doctoral fellow. Department of Stomatology, School of Dentistry, University of Sevilla, C/ Avicena s/n, 41009-Sevilla, Spain
| | - Jenifer Martín-González
- Doctoral fellow. Department of Stomatology, School of Dentistry, University of Sevilla, C/ Avicena s/n, 41009-Sevilla, Spain
| | - Juan J Segura-Egea
- Full Professor. Department of Endodontics, School of Dentistry, University of Sevilla, C/ Avicena s/n, 41009-Sevilla, Spain
| |
Collapse
|
7
|
Scelza MZ, Coil J, Alves GG. Effect of time of extraction on the biocompatibility of endodontic sealers with primary human fibroblasts. Braz Oral Res 2013; 26:424-30. [PMID: 23018229 DOI: 10.1590/s1806-83242012000500008] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2012] [Accepted: 07/03/2012] [Indexed: 11/22/2022] Open
Abstract
The aim of this work was to evaluate the effects of different times of extraction on the cytotoxicity of six representatives of different root canal sealer groups-Real Seal SE, AH Plus, GuttaFlow, Sealapex, Roth 801, and ThermaSeal Plus-with human gingival fibroblasts. The materials were prepared according to manufacturers' specifications, and were incubated in culture medium (DMEM) at 37ºC for 1, 7, 14, 21, and 28 days, with daily washing, to simulate periodontal ligament clearance. Human fibroblasts were exposed to the final extracts at 24 hours, and cell viability was determined by MTT assay, with exposure to unconditioned DMEM as a negative control. Statistical analysis comparing cytotoxicities at each exposure time was performed by ANOVA with Scheffé adjustment for multiple comparisons at a 95% confidence level. Results indicated that GuttaFlow was significantly less cytotoxic than all other sealers (p < 0.05) at 1 day of extraction. After 7 days of extraction, cell viability for GuttaFlow was significantly increased as compared with that of all groups except sealer AH Plus. At day 14, cytotoxicity of Sealapex was significantly higher than that of all other sealers (p < 0.05). At days 21 and 28, there were no significant differences in cytotoxicity among sealer groups. All materials presented some level of cytotoxicity to fibroblasts, while GuttaFlow was the least cytotoxic sealer tested. However, the cytotoxicity of all materials seemed to decrease similarly in a time-dependent manner.
Collapse
Affiliation(s)
- Miriam Zaccaro Scelza
- Laboratory of Experimental Cell Culture, Department of Endodontics, Univ Federal Fluminense, Niteroi, RJ, Brazil.
| | | | | |
Collapse
|
8
|
Kawasaki Y, Yamaji K, Matsunaga H, Sendo T. Cytotoxicity of the Polymerization Agent, 2-Methyl-4'-(methylthio)-2-morpholinopropiophenone on Human Monocytes. Biol Pharm Bull 2012; 35:256-9. [DOI: 10.1248/bpb.35.256] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
|
9
|
López-López J, Estrugo-Devesa A, Jané-Salas E, Segura-Egea JJ. Inferior alveolar nerve injury resulting from overextension of an endodontic sealer: non-surgical management using the GABA analogue pregabalin. Int Endod J 2011; 45:98-104. [PMID: 21883296 DOI: 10.1111/j.1365-2591.2011.01939.x] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
AIM To describe a case of endodontic sealer (AH Plus) penetration within the mandibular canal after root canal treatment with resolution of pain and paraesthesia after a non-surgical approach, including treatment with prednisone and pregabalin. SUMMARY A 37-year-old woman underwent root canal treatment of the left mandibular second molar tooth. Postoperative periapical radiographs revealed the presence of radiopaque canal sealer in the mandibular canal. The day after, the patient reported severe pain in the tooth and paraesthesia/anaesthesia in the region innervated by the left inferior alveolar and mental nerve. Diagnosis of injury to the inferior alveolar nerve because of extrusion of AH Plus was established. The non-surgical management included 1 mg kg(-1) per day prednisone, two times per day, in a regimen on a daily basis, and 150 mg per day pregabalin, two doses per day, monitoring the progress with periodic follow-up visits. One month after the incident, the signs and symptoms were gone. KEY LEARNING POINTS This case illustrates the care required when performing root canal treatment, especially when the root apices are in close proximity to the inferior alveolar nerve canal. The complete resolution of paraesthesia and the control of pain achieved in the present case suggests that a non-surgical approach combining prednisone and pregabalin is a good option in the management of the inferior alveolar when it is contacted by extruded root filling material.
Collapse
Affiliation(s)
- J López-López
- Department of Odonto-Stomatology, School of Dentistry, University of Barcelona, Barcelona, Spain
| | | | | | | |
Collapse
|
10
|
Silva-Herzog D, Ramírez T, Mora J, Pozos AJ, Silva LAB, Silva RAB, Nelson-Filho P. Preliminary study of the inflammatory response to subcutaneous implantation of three root canal sealers. Int Endod J 2011; 44:440-6. [PMID: 21255048 DOI: 10.1111/j.1365-2591.2011.01849.x] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
AIM To evaluate the kinetics of the inflammatory tissue response to three root canal sealers using a physicochemical method for quantification of the enhanced vascular permeability and histopathological analysis. METHODOLOGY Twenty-eight male Wistar rats randomly assigned to four groups according to the evaluation periods (1, 3, 7 and 14 days) were used to assess the vascular permeability and histopathological reaction to RoekoSeal, AH Plus and Sealapex (new formulation) sealers, using saline and Chloropercha as negative and positive controls, respectively. Seven rats were sacrificed per period. The biocompatibility of the sealers was evaluated spectrophotometrically and histopathologically. RESULTS At day 14, Sealapex produced significantly more inflammatory exudate than AH Plus and RoekoSeal (P < 0.05); however, there was no significant difference between AH Plus and RoekoSeal (P > 0.05). Sealapex (new formulation) was the most irritating sealer, producing severe inflammation with the presence of multinucleated giant cells. RoekoSeal was the most biocompatible sealer, producing the least amount of inflammatory exudate. CONCLUSIONS RoekoSeal root canal sealer was biocompatible when implanted in connective tissue.
Collapse
Affiliation(s)
- D Silva-Herzog
- Department of Endodontics, School of Dentistry, San Luis Potosi University, San Luis Potosi, Mexico
| | | | | | | | | | | | | |
Collapse
|
11
|
Yu MK, Lee YH, Yoon MR, Bhattarai G, Lee NH, Kim TG, Jhee EC, Yi HK. Attenuation of AH26-induced apoptosis by inhibition of SAPK/JNK pathway in MC-3T3 E1 cells. J Endod 2010; 36:1967-71. [PMID: 21092814 DOI: 10.1016/j.joen.2010.08.044] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2010] [Revised: 08/23/2010] [Accepted: 08/25/2010] [Indexed: 11/24/2022]
Abstract
INTRODUCTION The cytotoxicity of AH26, a resin-based sealer, induces apoptosis in osteoblast cells. However, the apoptosis pathway is not completely understood. This study examined the apoptosis pathway and its regulation of AH26 through mitogen-activated protein kinase (MAPKs), which may play a role in reducing the cytotoxicity of AH26. METHODS Using mouse osteoblasts cells (MC-3T3-E1), specimens of AH26 were eluted with the culture medium for 1, 3, 5, and 7 days. The cytotoxicity was tested using an 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide assay. The induction of apoptosis was detected by Hoechst33258 staining and poly (ADP-ribose) polymerase (PARP) activation. The AH26-involved signal pathway was analyzed by immunoblotting with a specific antibody. RESULTS AH26 exhibited cytotoxicity toward MC-3T3-E1 cells, which resulted in mitochondria-mediated apoptosis, as confirmed by Bax expression and the displacement of cytochrome c from mitochondria to cytosol. As evidence of MAPKs activation, the cells treated with AH26 expressed stress-activated protein/c-jun N-terminal kinase (SAPK/JNK) and extracellular signal-regulated protein kinase (ERK1/2). SAPK/JNK activation appears to regulate apoptosis, whereas ERK activation protects cell survival. CONCLUSIONS From these results, the toxicity of AH26 can be decreased by controlling the apoptosis signals. This approach might have potential applications for reducing the long-term stress of periapical tissue that improves endodontic treatment.
Collapse
Affiliation(s)
- Mi-Kyung Yu
- Department of Conservative Dentistry, School of Dentistry, Chonbuk National University, Jeonju, Korea
| | | | | | | | | | | | | | | |
Collapse
|
12
|
Brasil DS, Soares JA, Horta MCR, Ferreira CL, Nunes E, Chaves GG, Silveira FF. Periapical repair in dog teeth: root canal adhesive filling by using the Resilon System. J Endod 2010; 36:482-8. [PMID: 20171367 DOI: 10.1016/j.joen.2009.11.020] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2009] [Revised: 11/14/2009] [Accepted: 11/26/2009] [Indexed: 11/29/2022]
Abstract
INTRODUCTION New filling biomaterials with better physicochemical properties would create a favorable biologic environment for the healing of periapical tissues. The aim of this study was to evaluate periapical repair after biomechanical preparation and root filling with an adhesive system compared with the gold standard material (gutta-percha+sealer) in dog teeth. METHODS The pulp of 25 root canals was removed. The apical cementum layer was perforated, and the root canals were prepared up to size #60 K-file followed by step-back shaping with the #90 K-file and filled by the lateral condensation technique. In the experimental group (n=15), the Resilon System (Pentron Clinical Technologies, Wallingford, CT) was used. As a control material (n=10), gutta-percha cones and pulp canal sealer were used. After 60 days, the animals were killed, and 10 histologic parameters were evaluated. Differences among the groups were analyzed by using the Mann-Whitney and Fisher exact tests. RESULTS In radiographic and histologic evaluations, most fillings were slightly short of the apex. Progressive regenerative stages were observed; however, there was a reduced prevalence of biologic foraminal closure. No significant differences were observed between the 2 biomaterials with regard to any of the parameters evaluated (P>.05). CONCLUSIONS The Resilon System shows periapical biocompatibility equivalent to the gold standard material.
Collapse
|
13
|
Ding Y, Wang J, Wong CS, Halley PJ, Guo Q. Synthesis, characterization and biocompatibility of novel biodegradable cross-linked co-polymers based on poly(propylene oxide) diglycidylether and polyethylenimine. JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION 2010; 22:457-73. [PMID: 20566040 DOI: 10.1163/092050610x487747] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Novel biodegradable cross-linked co-polymers were prepared from poly(propylene glycol) diglycidylether (PPGDGE) and poly(ethylene imine) (PEI). PPGDGE and PEI were mixed at ambient temperature with varying PEI concentrations of 10, 15, 18.5, 25, 30, 40 and 50 wt%; the homogenous PPGDGE/PEI mixtures obtained were cured at elevated temperatures, resulting in formation of PPG-PEI cross-linked co-polymers via ring-opening reaction of PPGDGE with PEI. The physicochemical and biological properties of these co-polymers were dependent on the PEI content and the extent of curing reaction. The glass transition temperature of PPG-PEI cross-linked co-polymers varied in the range from -14 to +42°C, while the co-polymers displayed composition-dependent mechanical behavior, from brittle to ductile with increasing PEI content from 18.5 wt% to 40 wt%. Chinese hamster ovary (CHO) cells were cultured on the PPG-PEI co-polymers; the MTT assay was used to measure cell viability and determine the cytotoxicity. The cell viability rate, relative to tissue-culture polystyrene (TCPS), increased from 49% to 125% with increasing PEI content from 18.5 wt% to 40 wt%. Although epoxy monomers usually exhibit cytotoxicity, the epoxy groups were exhausted via curing reaction in the fully cross-linked co-polymers. The PEI-cured PPG epoxy resin, i.e., PPG-PEI cross-linked co-polymers obtained in this study, showed excellent biocompatibility.
Collapse
Affiliation(s)
- Yunsheng Ding
- Institute for Technology, Research and Innovation, Deakin University, Geelong, VIC 3217, Australia
| | | | | | | | | |
Collapse
|
14
|
AlAnezi AZ, Jiang J, Safavi KE, Spangberg LS, Zhu Q. Cytotoxicity evaluation of endosequence root repair material. ACTA ACUST UNITED AC 2010; 109:e122-5. [DOI: 10.1016/j.tripleo.2009.11.028] [Citation(s) in RCA: 83] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2009] [Revised: 11/13/2009] [Accepted: 11/14/2009] [Indexed: 11/29/2022]
|
15
|
|