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Kimura S, Sekine H, Kawasaki T, Sato T, Kasahara N. Influence of remaining coronal tooth morphology with resin abutment and fiber post on static and dynamic fracture resistances. Dent Mater J 2024; 43:552-558. [PMID: 38987203 DOI: 10.4012/dmj.2023-295] [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] [Indexed: 07/12/2024]
Abstract
This study aimed to clarify the fracture resistance of resin abutments built on endodontically treated roots with the remaining coronal teeth via static and cyclic loading tests. Endodontically treated bovine roots, which had a remaining coronal tooth covered with an occupied area for a quarter and half of the circumference at the tensile side or covered the circumference at both the tensile and compressive sides, were fabricated to build up to the resin abutment. Fracture resistance was evaluated via static and cyclic loading tests by applying a load of 30° to the tooth axis. Half of the circumference of the remaining coronal tooth showed a significantly higher static fracture load and survival rate. The remaining coronal tooth on the compressive side improved the dynamic fracture resistance associated with severe fractures. The occupied area and location of the remaining coronal tooth affected the static and dynamic fracture resistances.
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Affiliation(s)
| | - Hideshi Sekine
- Department of Fixed Prosthodontics, Tokyo Dental College
| | | | - Toru Sato
- Department of Fixed Prosthodontics, Tokyo Dental College
| | - Norio Kasahara
- Department of Histology and Developmental Biology, Tokyo Dental College
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Dotto L, Girotto LPS, Correa Silva Sousa YT, Pereira GKR, Bacchi A, Sarkis-Onofre R. Factors influencing the clinical performance of the restoration of endodontically treated teeth: An assessment of systematic reviews of clinical studies. J Prosthet Dent 2024; 131:1043-1050. [PMID: 35527069 DOI: 10.1016/j.prosdent.2022.03.030] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2022] [Revised: 03/28/2022] [Accepted: 03/29/2022] [Indexed: 10/18/2022]
Abstract
STATEMENT OF PROBLEM How best to restore endodontically treated teeth is still unclear because many types of material and techniques are involved. PURPOSE The purpose of this overview of systematic reviews of clinical studies was to assess the available evidence-based literature on the influence of associated clinical factors on the clinical performance (survival, failure rate, or success) of restored endodontically treated teeth. MATERIAL AND METHODS PubMed, Scopus, and Web of Science were searched from inception until September 27, 2021, to identify systematic reviews. Two reviewers independently screened titles, abstracts, and full-text articles, and each reviewer extracted the data of half of the included studies. A single reviewer with an independent verifier completed the quality appraisal. A descriptive analysis of the collected data was made. RESULTS A total of 36 systematic reviews fulfilled the inclusion criteria. The factors most assessed were the type of coronal restorative technique (n=22) and type of post (n=22). The results indicated that metal and fiber posts seem to present similar clinical performance, 1-piece endodontic crowns could be a suitable restorative option, there is no evidence to confirm whether single crowns are better or worse than direct restoration, the maintenance of the coronal structure is a fundamental factor, and the ferrule effect is still a controversial topic. Most of the studies (n=30, 81%) presented a final Grading of Recommendations, Assessment, Development and Evaluations (GRADE) rating of "critically low." CONCLUSIONS The post type does not appear to influence the clinical performance of restored endodontically treated teeth. However, conclusive evidence to suggest how different materials or techniques for restoring coronal tooth structure affect the clinical performance of such restorations, as well as the impact of the ferrule effect, is still lacking.
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Affiliation(s)
- Lara Dotto
- PhD student, School of Dentistry, Regional Integrated University of Upper Uruguai and Missions (URI), Erechim, RS, Brazil; and Master Student, Graduate Program in Dentistry, Pontifical Catholic University of Rio Grande do Sul (PUCRS), Porto Alegre, RS, Brazil
| | - Luiza Paloma S Girotto
- Master Student, Graduate Program in Dentistry, Meridional Faculty (IMED), Passo Fundo, RS, Brazil
| | | | - Gabriel Kalil Rocha Pereira
- Associate Professor, Post-Graduate Program in Oral Sciences, Federal University of Santa Maria (UFSM), Santa Maria, RS, Brazil
| | - Ataís Bacchi
- Associate Professor, Post-Graduate Program in Dentistry, Paulo Picanço School of Dentistry, Fortaleza, CE, Brazil
| | - Rafael Sarkis-Onofre
- Associate Professor, Graduate Program in Dentistry, Meridional Faculty (IMED), Passo Fundo, RS, Brazil.
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Bastos MF, Visconti MA, Pinto RR, Junqueira RB, Verner FS. Assessing the Impact of the Metal Artifact Reduction Tool on Detecting Furcation Lesions in Maxillary Molars with Different Intracanal Posts: An Ex Vivo Cone-beam Computed Tomography Study. J Endod 2024; 50:835-843. [PMID: 38395388 DOI: 10.1016/j.joen.2024.02.009] [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: 11/21/2023] [Revised: 02/11/2024] [Accepted: 02/12/2024] [Indexed: 02/25/2024]
Abstract
INTRODUCTION Considering the potential image compromise and diagnostic challenges posed by metals, this study aimed to assess the efficacy of the metal artifact reduction (MAR) tool in cone-beam computed tomography examinations for detecting furcation lesions in upper molars treated endodontically and restored with different intracanal posts. METHODS This ex vivo study used 45 endodontically treated maxillary first molars, categorized into the following3 groups (n = 15): control (without intracanal post), metal post, and fiberglass post. Simulations were conducted in the laboratory to replicate alveolar bone, periodontal ligament, and grade I, II, and III furcation lesions. Cone-beam computed tomography scans were obtained with and without the MAR tool, and the furcation lesions were evaluated considering a 5-point Likert scale. Data were analyzed at 5%. RESULTS In the control group, there was no influence of MAR (P > .05); grade II lesions were not diagnosed, and grade III lesions were the most detected (P < .05). In the metal post group with MAR, grade III lesions were diagnosed more frequently than I and II (P < .05) and grade III without MAR (P < .05). In the fiberglass post group, the diagnosis of grade I lesions decreased with MAR (P < .05), and without MAR, grade III was most diagnosed (P < .05); grade III lesions were the most diagnosed (P < .05). CONCLUSIONS The MAR tool was only effective for diagnosing grade III furcation lesions, regardless of the intracanal material. Its application for grade I and II lesions did not contribute to improved diagnosis. Furthermore, in the fiberglass post group with grade I lesions, the MAR tool negatively affected the detection of the lesions.
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Affiliation(s)
- Mayara Fidelis Bastos
- Department of Pathology and Oral Diagnosis, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - Maria Augusta Visconti
- Department of Pathology and Oral Diagnosis, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - Rafael Rocha Pinto
- Department of Pathology and Oral Diagnosis, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - Rafael Binato Junqueira
- Department of Dentistry, Federal University of Juiz de Fora/GV Campus, Governador Valadares, Brazil
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Dimitrova M, Vlahova A, Kazakova R. Assessment of CAD/CAM Fabrication Technologies for Post and Core Restorations-A Narrative Review. MEDICINA (KAUNAS, LITHUANIA) 2024; 60:748. [PMID: 38792931 PMCID: PMC11123209 DOI: 10.3390/medicina60050748] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/05/2024] [Revised: 04/27/2024] [Accepted: 04/28/2024] [Indexed: 05/26/2024]
Abstract
The primary objective of this study is to conduct a comprehensive review of the existing literature that discusses research on post and core restorations, covering aspects such as their composition, manufacturing methods, and clinical effectiveness. The methodology employed in this review encompasses the implementation of a well-defined search strategy, the establishment of criteria for inclusion and exclusion, and the selection of relevant studies to summarize their findings. To gather relevant literature published between 1993 and 2023, the research team conducted separate searches on PubMed, Web of Science, and Embase databases. In total, 168 titles were initially retrieved from these electronic databases. By applying the predefined exclusion criteria, the researchers identified 73 articles that specifically address the conventional and computer-aided design/computer-aided manufacturing (CAD/CAM) technologies employed in post and core restorations. These treatments are commonly employed to restore teeth that have received endodontic therapy and subsequently experienced loss of dental structure. The development of computerized technology for the creation of customized posts and cores has emerged as a straightforward and efficient alternative to traditional methods. The review synthesizes papers discussing the techniques and materials involved in CAD/CAM-based construction of post and cores. It explores strategies for restoring endodontically treated teeth, highlighting both direct and indirect approaches. Commonly mentioned materials include zirconia, composite resin, and hybrid ceramics. Despite the limited literature on CAD/CAM post and core procedures, the review emphasizes the necessity of further research to assess long-term outcomes and efficacy. Additionally, it suggests including implications for future research and clinical recommendations to enhance the depth and practical relevance of the review.
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Affiliation(s)
- Mariya Dimitrova
- Department of Prosthetic Dentistry, Faculty of Dental Medicine, Medical University of Plovdiv, 4000 Plovdiv, Bulgaria; (A.V.); (R.K.)
| | - Angelina Vlahova
- Department of Prosthetic Dentistry, Faculty of Dental Medicine, Medical University of Plovdiv, 4000 Plovdiv, Bulgaria; (A.V.); (R.K.)
- CAD/CAM Center of Dental Medicine, Research Institute, Medical University of Plovdiv, 4000 Plovdiv, Bulgaria
| | - Rada Kazakova
- Department of Prosthetic Dentistry, Faculty of Dental Medicine, Medical University of Plovdiv, 4000 Plovdiv, Bulgaria; (A.V.); (R.K.)
- CAD/CAM Center of Dental Medicine, Research Institute, Medical University of Plovdiv, 4000 Plovdiv, Bulgaria
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Tsintsadze N, Margvelashvili-Malament M, Natto ZS, Ferrari M. Comparing survival rates of endodontically treated teeth restored either with glass-fiber-reinforced or metal posts: A systematic review and meta-analyses. J Prosthet Dent 2024; 131:567-578. [PMID: 35430048 DOI: 10.1016/j.prosdent.2022.01.003] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2021] [Revised: 01/04/2022] [Accepted: 01/04/2022] [Indexed: 10/18/2022]
Abstract
STATEMENT OF PROBLEM When restoring endodontically treated teeth, a post system is indicated to retain a core. Clinicians can choose from different post materials and types. However, the literature is inconclusive on the long-term clinical performance of available post systems. PURPOSE The purpose of this systematic review and meta-analysis was to analyze the survival and failure rates of endodontically treated teeth restored either with glass-fiber-reinforced or metal posts. MATERIAL AND METHODS The research question was formulated by following the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines by using the Population, Intervention, Comparison, Outcome, Study Type (PICOS) tool. Medline (PubMed), Embase, and Scopus searches complemented by manual search were performed for randomized controlled clinical trials with a follow-up of at least 2 years. Two independent authors performed screening and data extraction of the articles. Meta-analyses were performed with the RevMan software program. Homogeneity was checked by using chi2 and I2 tests, and random-effects meta-analyses were applied. Odds ratio and 95% confidence interval were calculated (α=.05). The publication bias was evaluated by using funnel plots and the Begg and Egger tests. RESULTS A total of 184 studies were retrieved through the electronic searches, and an additional 4 through the hand search. After title- and abstract-level exclusion, 23 studies remained for full-text analyses, of which 7 were selected for data extraction. Meta-analyses revealed an overall survival rate of 92.8% for endodontically treated teeth restored with glass-fiber-reinforced posts compared with 78.1% of those restored with metal posts. No statistically significant difference (P>.05) was found in the survival, success, or failure rates. CONCLUSIONS No statistically significant differences were found between the survival and failure rates of endodontically treated teeth restored either with glass-fiber-reinforced or metal posts. The overall survival rate was 92.8% for glass fiber posts and 78.1% for metal posts. Both are reliable materials when a significant amount of coronal tooth structure is missing and treatment with a post is indicated.
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Affiliation(s)
- Nino Tsintsadze
- PhD student, Department of Medical Biotechnologies, University of Siena, Policlinico Le Scotte, Viale Bracci, Siena, Italy.
| | | | - Zuhair S Natto
- Associate Professor, Department of Dental Public Health, Faculty of Dentistry, King Abdulaziz University, Jeddah, Saudi Arabia; Adjunct Assistant Professor, Department of Periodontology, Tufts University School of Dental Medicine, Boston, Mass
| | - Marco Ferrari
- Chair and Full Professor, Department of Medical Biotechnologies, University of Siena, Policlinico Le Scotte, Viale Bracci, Siena, Italy
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Marinescu AG, Abuabboud O, Zimbru ȘD, Cîrligeriu LE, Piț BA, Borcean IA, Paven M, Nica LM, Stoia DI. Influence of the Fiber Post Length on the Fracture Strength of Endodontically Treated Teeth. MEDICINA (KAUNAS, LITHUANIA) 2023; 59:1797. [PMID: 37893515 PMCID: PMC10608114 DOI: 10.3390/medicina59101797] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/06/2023] [Revised: 10/08/2023] [Accepted: 10/08/2023] [Indexed: 10/29/2023]
Abstract
Background and Objectives: Although fiber posts are widely used in the restoration of endodontically treated teeth (ETT), their ideal cementation depth into the root canal is still debated in literature. The aim of the present study was to evaluate whether the different intra-radicular insertion lengths of the fiber posts influence the fracture strength of ETT. Materials and Methods: A total of 10 permanent human lower incisors with straight roots of similar length and volume extracted for periodontal reason were sectioned 2 mm above the cement-enamel junction (CEJ) to a total length of 18 mm and endodontically treated in the same manner, then randomly divided into two groups of five each (Groups 1 and 2, n = 5). Two sound incisors, with no endodontic treatment, were used as the control group (Group 3, n = 2). After one week of storage in a humid environment, spaces for fiber post no. 1 (Reforpost, Angelus, Londrina, PR, Brazil) were prepared in the first two groups at a depth of 5 mm (Group 1) and 7 mm (Group 2), and the fiber posts were adhesively cemented using self-adhesive resin cement (Maxcem Elite, Kerr GmbH, Herzogenrath, Germany). After 7 days, the samples were vertically positioned and fixed in a self-curing transparent acrylic resin, up to 2 mm below the CEJ level, and mechanically tested in compression after another week of storage using a displacement-controlled testing machine up to each sample's fracture. The force-displacement curves were recorded for each sample, the means were calculated for each group and a statistical comparative analysis between groups was conducted. Results: Although no statistically significant differences between groups were observed, the highest mean fracture force (N) was recorded in Group 2 (1099.41 ± 481.89) in comparison to Group 1 (985.09 ± 330.28), even when compared to the sound, non-treated teeth (1045.69 ± 146.19). Conclusions: Within the limitations of this in vitro study, teeth where fiber posts were placed deeper into the root canal (7 mm) recorded slightly higher fracture forces in comparison with shorter lengths (5 mm). However, similar biomechanical performances obtained in the mechanical tests showed no statistical differences between the 7 mm and the 5 mm inserted posts.
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Affiliation(s)
- Adrian-George Marinescu
- Department of Restorative Dentistry and Endodontics, Research Center TADERP, Faculty of Dentistry, “Victor Babeș” U.M.Ph.–Timisoara, 300041 Timisoara, Romania; (A.-G.M.); (L.-E.C.); (M.P.)
| | - Osama Abuabboud
- Faculty of Dentistry, “Victor Babeș” U.M.Ph.–Timisoara, 300041 Timisoara, Romania; (O.A.); (Ș.-D.Z.); (B.-A.P.); (I.-A.B.)
| | - Ștefana-Denisa Zimbru
- Faculty of Dentistry, “Victor Babeș” U.M.Ph.–Timisoara, 300041 Timisoara, Romania; (O.A.); (Ș.-D.Z.); (B.-A.P.); (I.-A.B.)
| | - Laura-Elena Cîrligeriu
- Department of Restorative Dentistry and Endodontics, Research Center TADERP, Faculty of Dentistry, “Victor Babeș” U.M.Ph.–Timisoara, 300041 Timisoara, Romania; (A.-G.M.); (L.-E.C.); (M.P.)
| | - Bianca-Adina Piț
- Faculty of Dentistry, “Victor Babeș” U.M.Ph.–Timisoara, 300041 Timisoara, Romania; (O.A.); (Ș.-D.Z.); (B.-A.P.); (I.-A.B.)
| | - Ioana-Amalia Borcean
- Faculty of Dentistry, “Victor Babeș” U.M.Ph.–Timisoara, 300041 Timisoara, Romania; (O.A.); (Ș.-D.Z.); (B.-A.P.); (I.-A.B.)
| | - Mihai Paven
- Department of Restorative Dentistry and Endodontics, Research Center TADERP, Faculty of Dentistry, “Victor Babeș” U.M.Ph.–Timisoara, 300041 Timisoara, Romania; (A.-G.M.); (L.-E.C.); (M.P.)
| | - Luminița-Maria Nica
- Department of Restorative Dentistry and Endodontics, Research Center TADERP, Faculty of Dentistry, “Victor Babeș” U.M.Ph.–Timisoara, 300041 Timisoara, Romania; (A.-G.M.); (L.-E.C.); (M.P.)
| | - Dan Ioan Stoia
- Department of Mechanics and Strength of Materials, Polytechnica University Timisoara, 300006 Timișoara, Romania;
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Özcan N, Utar M, Çulhaoğlu AK, Erdoğan HG. Effect of Er:YAG laser on removal of fibre posts from root canal. AUST ENDOD J 2023; 49 Suppl 1:294-300. [PMID: 36573837 DOI: 10.1111/aej.12732] [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: 09/02/2022] [Revised: 12/11/2022] [Accepted: 12/13/2022] [Indexed: 12/28/2022]
Abstract
The aim of this study was to evaluate the efficiency of Er:YAG laser in translucent fibre post removal. 60 human single-rooted anterior teeth were divided into three groups (n = 20) according to post diameters (Exacto1-E1, Exacto2-E2, Exacto3-E3) and subdivided according to laser application. Fibre posts were cemented to endodontically treated teeth, and the specimens were sliced with a thickness of 1.0 ± 0.2 mm. Er:YAG laser was applied and the push out bond strength test was performed. Two-way analysis of variance was used to perform the statistical analysis. Push out bond strengths at apical area were significantly lower in all test groups (p < 0.05). Laser application caused increase in all radicular thirds, but it was significant for E1 and E3 groups. Laser application to the post-dentine interface enhances the connection between post and dentine.
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Affiliation(s)
- Nihal Özcan
- Department of Prosthodontics, Faculty of Dentistry, Kirikkale University, Kirikkale, Turkey
| | | | - Ahmet Kürsad Çulhaoğlu
- Department of Prosthodontics, Faculty of Dentistry, Health Sciences Gülhane University, Ankara, Turkey
| | - Hamiyet Güngör Erdoğan
- Department of Prosthodontics, Faculty of Dentistry, Lokman Hekim University, Ankara, Turkey
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Madfa AA. Effect of Dental Glass Fiber Posts on Root Stresses and Fracture Behavior of Endodontically Treated Maxillary Central Incisors: A Finite Element Analysis Study. Cureus 2023; 15:e43056. [PMID: 37680412 PMCID: PMC10480686 DOI: 10.7759/cureus.43056] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/06/2023] [Indexed: 09/09/2023] Open
Abstract
OBJECTIVE In this work, the influence of glass fiber posts with different designs on the root stress that had endodontic treatment was examined using the finite element method. METHOD Using two distinct materials (metal and glass fiber) and two different prototypes (tapered and parallel-sided), four three-dimensional (3D) finite element models of an upper central incisor were made and studied. Each 3D model received an oblique loading of 100 N. All forces were dispatched as distributed pressure to the aforementioned region. There were no considerations made for potential stresses when performing the endodontic procedure. The endodontic treatment was conducted without taking into account any potential stressors. The root stresses were then recorded. RESULTS The largest tensile stress is often focused at the apical third of the post and post/cement contact, as well as at the coronal third of the root on both the labial and palatal sides of the root, independent of the post's design and material. Restoration of endodontically treated maxillary central incisors with glass fiber posts has been shown to have less stress concentration than titanium posts. Regardless of the post materials employed, the tapered post design generated a higher tensile stress distribution than the parallel side design. CONCLUSIONS Prefabricated fiber posts used in model restoration resulted in more evenly distributed stress and less concentrated stress on the root. Reduction in modulus of elasticity of post materials used generally shows less stress concentration.
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Affiliation(s)
- Ahmed A Madfa
- Department of Restorative Dental Science, College of Dentistry, University of Ha'il, Ha'il, SAU
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Vohra F, Kuyunov I, Alsaif RF, El Mourad AM. Effect on Martens Hardness and pushout bond strength of fiber post to canal dentin final irrigated with Fotoenticine, Chitosan, and ozone. Photodiagnosis Photodyn Ther 2023; 42:103546. [PMID: 37001713 DOI: 10.1016/j.pdpdt.2023.103546] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2023] [Revised: 03/13/2023] [Accepted: 03/24/2023] [Indexed: 03/31/2023]
Abstract
AIMS To estimate the effect of contemporary final root canal irrigants (Ozonated water (OW), Chitosan, and Fotoenticine (FTC) on the bond scores of glass fiber post (GFP) and Martens hardness (MH) of root dentin. MATERIALS AND METHODS Sixty extracted human premolars having a single straight canal that ends in a closed apex were included. Specimens were de-crowned till the cementoenamel junction preserving 12 mm of root length and were mounted vertically. Canal therapy was performed using a crown-down approach. Obturation was performed followed by post-space preparation. Samples were allocated into 4 groups based on chemical irrigations and photosensitizers used(n = 15). Group 1 (5.25% NaOCl + 17% EDTA), group 2 (5.25% NaOCl + FTC), group 3 (5.25% NaOCl + Chitosan), group 4 (5.25% NaOCl + OW). The ultra microhardness tester was put under a load of 5 mN at a speed of 1.5 mN/s for 1 s to assess the MH. The fiber post was luted with dual-cure cement and slices of 1 mm were prepared from each third of the tooth. PBS and failure mode analysis were performed using a universal testing machine (UTM) and stereomicroscope respectively. ANOVA and Tukey multiple comparisons t-tests for assessment of PBS and MH p > 0.05 RESULTS: Group 1 (5.25% NaOCl + 17% EDTA) exhibited the highest MH (0.19 ± 0.04 GPa). Whereas, group 2 (5.25% NaOCl + FTC) displayed the lowest MH (0.011 ± 0.14 GPa). The highest PBS was exhibited by the coronal third of group 1 (5.25% NaOCl + 17% EDTA) (7.11 ± 0.81 MPa). The apical section of group 3 specimens (5.25% NaOCl + Chitosan) (2.33 ± 0.26 MPa) unveiled the lowest PBS. Intergroup comparison analysis revealed that group 2 and group 3 displayed comparable outcomes of PBS. Group 1 and Group 4 also demonstrated no significant difference in the bond scores in all three sections. CONCLUSION OW as a final irrigant can be used as an alternative to EDTA as it improves the bond strength with minimum impact on marten hardness.
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Affiliation(s)
- Fahim Vohra
- Department of Prosthetic Dental Science, College of Dentistry, King Saud University, P. O. Box 60169, Riyadh 11545, Saudi Arabia.
| | - Isaac Kuyunov
- Specialist in Prosthodontics, Rochester, NY 14618, USA
| | - Rawan F Alsaif
- Department of Prosthetic Dental Science, College of Dentistry, King Saud University, P. O. Box 60169, Riyadh 11545, Saudi Arabia
| | - Aminah M El Mourad
- Department of Restorative Dental Sciences, College of Dentistry, King Saud University, Riyadh 11545, Saudi Arabia
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Kaya Büyükbayram I, Güven ME, Ayman D, Şener Yamaner ID, Cakan EF. Fracture resistance of resin endocrowns with and without fiber reinforced composite base material: A preliminary study. J Appl Biomater Funct Mater 2023; 21:22808000231151832. [PMID: 36708253 DOI: 10.1177/22808000231151832] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
Abstract
OBJECTIVE The aim of this study was to investigate the effects of fiber-reinforced composite base material on fracture resistance and fracture pattern of endodontically treated maxillary premolars restored with endocrowns using two different resin nanoceramic computer-aided design and computer-aided manufacturing (CAD/CAM) restorative material. METHODS Forty extracted sound maxillary premolars with an occlusal reduction of 2 mm above the cementoenamel junction (CEJ) was performed following root canal treatment. Mesial interproximal box was prepared for each tooth at the margin of the CEJ and randomly distributed into four groups (n = 10) as follows: Group A, no resin build-up in the pulp chamber; Group B, 2 mm of fiber-reinforced composite (FRC) build-up (EverX Posterior, GC).; Group C, no resin build-up in pulp chamber; Group D, 2 mm of FRC build-up. Groups A and B were prepared with resin nanoceramic (RNC) consisting ceramic nanofillers (Lava Ultimate 3 M ESPE), while Group C and D were prepared with RNC consisting ceramic nanohybrid fillers (Cerasmart GC Corp). All samples were subjected to 1,200,000 chewing cycles (1.6 Hz, 50 N) and 5000 thermal cycles (5°C-55°C) for artificial aging on a chewing simulator with thermal cycles (CSTC). Samples that survived the CSTC test without being damaged were subjected to a load-to-fracture test. RESULTS The highest mean fracture strength was found in Group D (936.0 ± 354.7) and lowest in Group A (684.2 ± 466.9). Fracture strength was higher in groups where FRC was used as a base material than plain restorations. However, there were no significant differences between the Lava and Cerasmart groups with and without FRC (p > 0.05). Most of the samples were irreparably fractured under CEJ. CONCLUSION Using short FRCs as a resin base material did not significantly improve fracture resistance. Cerasmart and Lava blocks had similar fracture resistance and fracture pattern.
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Affiliation(s)
- Işıl Kaya Büyükbayram
- Department of Endodontics, School of Dentistry, İstanbul Aydın University, Küçükçekmece, İstanbul, Turkey
| | - Mehmet Esad Güven
- Department of Prosthodontics, School of Dentistry, Necmettin Erbakan University, Konya, İstanbul, Turkey
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Kanzler Abdel Raouf V, Jockusch J, Al-Haj Husain N, Dydyk N, Özcan M. Push-Out Bond Strength Assessment of Different Post Systems at Different Radicular Levels of Endodontically Treated Teeth. MATERIALS 2022; 15:ma15155134. [PMID: 35897567 PMCID: PMC9332514 DOI: 10.3390/ma15155134] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 06/22/2022] [Revised: 07/21/2022] [Accepted: 07/22/2022] [Indexed: 02/01/2023]
Abstract
This study assessed the bond strength of prefabricated post systems at different root levels of endodontically treated teeth. One-rooted human premolars (N = 70; n = 10) were cut to 2 mm above the cement-enamel junction. Root canals were treated and randomly assigned to one of the seven post systems: T: Titanium (Mooser), ZrO: Zirconia (Cosmopost), G: Fiber (FRC Postec Plus), E1: Fiber (Direct) (Everstick post), E2: Fiber (Indirect) (Everstick post), PP: Fiber (PinPost), and LP: Injectable Resin/Fiber composite (EverX Posterior). All posts were luted using a resin cement (Variolink II), and the roots were sectioned at the coronal, middle, and apical root levels. Push-out tests were performed in the Universal Testing Machine (0.5 mm/min). Data (MPa) were analyzed using two-way ANOVA and Tukey’s tests (α = 0.05). The results showed that the bond strength (mean ± SD) of E2 posts were highest (5.3 ± 2.7) followed by PP (4.1 ± 2.0); G (4.0 ± 1.6); LP (2.6 ± 1.9): T (2.2 ± 1.5) and ZrO (1.9 ± 1.0) posts systems. No significant differences were found in bond strength of all post systems. The bond strength in the coronal root level was the highest with 3.6 ± 2.2 MPa. The bond strength of FRC post systems was significantly higher than those of rigid posts of titanium or ZrO2. Bond strength results were the highest in the coronal root level for all tested post systems but did not differ significantly from the other two root levels.
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Affiliation(s)
- Valérie Kanzler Abdel Raouf
- Division of Dental Biomaterials, Clinic of Reconstructive Dentistry, Center of Dental Medicine, University of Zurich, 8032 Zurich, Switzerland; (V.K.A.R.); (N.A.-H.H.); (N.D.)
| | - Julia Jockusch
- University Research Priority Program Dynamics of Healthy Aging“, University of Zurich, 8050 Zurich, Switzerland;
| | - Nadin Al-Haj Husain
- Division of Dental Biomaterials, Clinic of Reconstructive Dentistry, Center of Dental Medicine, University of Zurich, 8032 Zurich, Switzerland; (V.K.A.R.); (N.A.-H.H.); (N.D.)
- Department of Reconstructive Dentistry and Gerodontology, School of Dental Medicine, University of Bern, 3010 Bern, Switzerland
| | - Nataliya Dydyk
- Division of Dental Biomaterials, Clinic of Reconstructive Dentistry, Center of Dental Medicine, University of Zurich, 8032 Zurich, Switzerland; (V.K.A.R.); (N.A.-H.H.); (N.D.)
- Department of Prosthetic Dentistry, Danylo Halytskyy Lviv National Medical University, 79010 Lviv, Ukraine
| | - Mutlu Özcan
- Division of Dental Biomaterials, Clinic of Reconstructive Dentistry, Center of Dental Medicine, University of Zurich, 8032 Zurich, Switzerland; (V.K.A.R.); (N.A.-H.H.); (N.D.)
- Correspondence: ; Tel.: +41-44-6343251; Fax: +41-44-6344305
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12
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Accuracy of Digital Impression Taking with Intraoral Scanners and Fabrication of CAD/CAM Posts and Cores in a Fully Digital Workflow. MATERIALS 2022; 15:ma15124199. [PMID: 35744261 PMCID: PMC9228234 DOI: 10.3390/ma15124199] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/09/2022] [Revised: 06/08/2022] [Accepted: 06/10/2022] [Indexed: 01/16/2023]
Abstract
Current intraoral scanners (IOS) enable direct impression taking for computer-aided de-sign/computer-aided manufacturing (CAD/CAM) posts and cores (P+C) with subsequent milling out of monolithic materials. The aim of this in vitro study was to systematically investigate the accuracy of CAD/CAM-P+C in a fully digital workflow, considering different IOS impression methods (Primescan (PRI), Trios4 without (TRI) and with scanpost (TRI+SP)) (Part A), and CAD/CAM milling of zirconium dioxid (ZIR) and resin composite (COM)-P+C (Part B). Five human models were developed in this study. Micro-CT imaging was used as a reference (REF). For Part A, the models were scanned 12 times for each impression method. Then, IOS datasets (n = 180) were superimposed with REF, and scan accuracy was determined using 3D software (GOMInspect). For Part B, one CAD/CAM-P+C (n = 30) was milled for each model, impression method, and material. The triple-scan method was applied using an industrial scanner (ATOS) to determine the accuracy of the fit. Statistical analysis was performed using analysis of variance (ANOVA, p < 0.05). Part A showed for PRI significantly lower accuracy than TRI and TRI+SP (p < 0.05). The data of Part B revealed significantly higher accuracy for ZIR than for COM (p < 0.05). Within the limitations of this study, CAD/CAM-P+C of the ZIR can be recommended for fabrication in a fully digital workflow regarding the accuracy of fit.
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al-Qarni FD. Customized Post and Cores Fabricated with CAD/CAM Technology: A Literature Review. Int J Gen Med 2022; 15:4771-4779. [PMID: 35571288 PMCID: PMC9091696 DOI: 10.2147/ijgm.s365296] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2022] [Accepted: 04/22/2022] [Indexed: 11/23/2022] Open
Abstract
Post and core restorations are a widely accepted method to restore endodontically treated teeth with compromised tooth structure. The use of computerized technology to fabricate customized post and cores is a simple and quick alternative to conventional methods. A literature search was conducted, and a summary of articles describing fabrication techniques and materials used to fabricate post and cores with computer-aided design and computer-aided manufacturing (CAD/CAM) has been provided. Several techniques have been reported to restore endodontically treated teeth with CAD/CAM post and cores, including direct and indirect methods. Zirconia, composite resin, and hybrid ceramic were the most commonly reported materials. Published reports on CAD/CAM post and core are limited; however, further studies are needed to investigate the long-term outcome of this treatment.
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Affiliation(s)
- Faisal D al-Qarni
- Department of Substitutive Dental Sciences, College of Dentistry, Imam Abdulrahman Bin Faisal University, Dammam, Saudi Arabia
- Correspondence: Faisal D al-Qarni, Department of Substitutive Dental Sciences, College of Dentistry, Imam Abdulrahman Bin Faisal University, Dammam, Saudi Arabia, Tel +966 13 333 1404, Email
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Survival Rates of Endodontically Treated Posterior Teeth Restored with All-Ceramic Partial-Coverage Crowns: When Systematic Review Fails. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2022; 19:ijerph19041971. [PMID: 35206160 PMCID: PMC8871862 DOI: 10.3390/ijerph19041971] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/14/2021] [Revised: 02/06/2022] [Accepted: 02/07/2022] [Indexed: 11/17/2022]
Abstract
Background: To determine the survival rates of endodontically treated posterior teeth (EDPT) restored with partial coverage all-ceramic crowns with or without the use of fiber posts. Methods: MEDLINE and Cochrane searches were conducted in order to identify Randomized Clinical Trials (RCTs) related to endodontically treated posterior teeth restored with partial coverage crowns. The search period was extended until February 2020 and only in vivo, human, and studies in the English language were included. A manual search was also conducted and additional articles, if found, were included in the database. Results: The initial search for the selected databases identified 495 studies, which were all screened for inclusion through titles, abstracts and full-text reading. Out of these 495 studies, only one article met the eligibility criteria and was included in this systematic review. Statistical analysis could not be performed. Conclusions: Only one RCT was identified in this systematic review. More clinical evidence is necessary to assess the survival rate of EDPT with partial-coverage crowns. This systematic review failed because it did not find scientific evidence to support the use of indirect bonded restorations on EDPT.
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Patel SS, Sethuraman R. A randomized controlled twelve month clinical study on the evaluation of success rate of endodontically treated teeth restored with metal poly-fiber posts and dentin posts. J Indian Prosthodont Soc 2022; 22:38-47. [PMID: 36510946 PMCID: PMC8884352 DOI: 10.4103/jips.jips_134_21] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
Settings and Design Department of Prosthodontics, KMSDCH, SVDU, Randomised Controlled study. Materials and Methods Thirty-six teeth that satisfied selection criteria were randomly allocated and treated in the two intervention groups - metal fiber post with composite core and dentin post with composite core. Patient characteristics with respect to gender, tooth guidance, type of tooth, and mobility amount of tooth structure left were recorded. The primary outcome of tooth loss and the secondary outcomes of recurrent caries detected at the crown margin, de-cementation of crown, and fracture of the core, post, and root were recorded at baseline, 3, 6, and 12 month follow up. Statistical Analysis Used Chi Square test. Results Thirty-six teeth in 17 patients (10 males and 7 females) were treated using metal fiber post (18 teeth) and dentin post (18 teeth). No loss of tooth was seen at the end of 3, 6, and 12 months. The secondary outcomes also showed no recurrent caries at margin and no fracture of core, post, and root in both the groups at the end of 3, 6, and 12 months. One case of de-cementation was observed in both the groups at the 12-month period. Periodontal and periapical conditions showed no clinical and radiographic signs at any of the follow-up periods in both the groups. Conclusion This twelve month randomized controlled clinical study concluded a similar success rate for endodontically treated teeth restored with crowns on both metal fiber post with composite core and dentin post with composite core.
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Affiliation(s)
- Sarvesh Shrikantbhai Patel
- Department of Prosthodontics, K M Shah Dental College and Hospital, Sumandeep Vidyapeeth Deemed to be University, Vadodara, Gujarat, India
| | - Rajesh Sethuraman
- Department of Prosthodontics, K M Shah Dental College and Hospital, Sumandeep Vidyapeeth Deemed to be University, Vadodara, Gujarat, India,Address for correspondence: Dr. Rajesh Sethuraman, No 9 Department of Prosthodontics, K M Shah Dental College and Hospital, Sumandeep Vidyapeeth Deemed to be University, Piparia, Vadodara - 391 760, Gujarat, India. E-mail:
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Does Multi-Fiber-Reinforced Composite-Post Influence the Filling Ability and the Bond Strength in Root Canal? Bioengineering (Basel) 2021; 8:bioengineering8120195. [PMID: 34940348 PMCID: PMC8698466 DOI: 10.3390/bioengineering8120195] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2021] [Revised: 11/23/2021] [Accepted: 11/24/2021] [Indexed: 12/14/2022] Open
Abstract
The purpose of the present in vitro study was to investigate the bond strength of root canal dentin and the filling ability of a new multi-fiber-reinforced composite post (mFRC) compared to a conventional single fiber-reinforced-composite post (sFRC). Twenty-eight freshly maxillary first permanent single-rooted premolars were instrumented and divided into groups (n = 14). Group 1: single-fiber-reinforced composite (sFRC), group 2: multi-fiber-reinforced composite (mFRC). Bonding procedures were performed using a dual-cure universal adhesive system and resin cement. All specimens were sectioned so that seven discs of 1 mm of thickness were obtained from each root. An optical microscope was used before the push-out test to measure the total area of the voids and to determine the length of the smaller/bigger circumferences. The push-out bond strength (PBS) test was performed using an Instron universal testing machine. Data were then compared by one-way ANOVA on ranks (α = 0.05). The dentin–cement–post interface was observed using scanning electron microscopy (SEM). At the coronal third, a significantly higher bond strength (p < 0.05) was obtained in the sFRC group (44.7 ± 13.1 MPa) compared to the mFRC group (37.2 ± 9.2 MPa). No significant difference was detected between the groups at the middle third (sFRC group “33.7 ± 12.5 MPa” and mFRC group “32.6 ± 12.4 MPa”) (p > 0.05). Voids were significantly lower in the mFRC compared to those observed in the sFRC group (p < 0.05) at the coronal third. Whereas, no significant difference was found at the middle third (p > 0.05) between the tested groups. Filling ability was overall improved when employing mFRC, although such technique might have characteristic limitations concerning the bond strength to dentin.
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Kawasaki T, Sato T, Hisanaga R, Nomoto S, Yotsuya M, Yoshinari M, Takemoto S. Influence of one-wall remaining coronal tooth with resin abutment and fiber post on static and dynamic fracture resistance. Dent Mater J 2021; 41:241-248. [PMID: 34759127 DOI: 10.4012/dmj.2021-145] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The objective of this study was to determine the influence of height and thickness of the one wall remaining coronal tooth structure on the fracture resistance of an endodontically treated root with resin abutment build-up using resin composite and fiber-reinforced resin composite post. Static and dynamic fracture tests were performed by placing the remaining tooth wall on the tensile side and applying loads at an angle of 30° from the tooth axis. Superior static fracture resistance was observed when the wall remaining on the tooth had a height and thickness greater than 1.0 mm. The dynamic fatigue test showed high loading capacity or fracture resistance in specimens with large height and thickness. The dynamic fatigue test showed the influence of the remaining tooth structure on fracture resistance clearly. In conclusion, the static and dynamic fracture resistances increased with the height and thickness of the one wall remaining tooth structure.
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Affiliation(s)
| | - Toru Sato
- Department of Fixed Prosthodontics, Tokyo Dental College
| | | | | | - Mamoru Yotsuya
- Department of Fixed Prosthodontics, Tokyo Dental College
| | | | - Shinji Takemoto
- Department of Biomedical Engineering, Iwate Medical University
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Ha WN, Chaves GS, Decurcio D, Estrela C, Peters OA, Rossi-Fedele G. Remaining dentinal thickness after simulated post space preparation and the fit of prefabricated posts to root canal preparation shapes. J Am Dent Assoc 2021; 152:1020-1032.e12. [PMID: 34656294 DOI: 10.1016/j.adaj.2021.06.014] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2021] [Revised: 05/30/2021] [Accepted: 06/22/2021] [Indexed: 11/20/2022]
Abstract
BACKGROUND Post space preparation can increase the risk of experiencing perforation and root fracture. The authors assessed remaining dentin thickness after post space preparation and the fit of different prefabricated posts to root canal preparation systems in a theoretical model. METHODS Ten datasets per type of tooth from cone-beam computed tomography were analyzed to determine the minimum root diameter from 5 through 13 mm from the apical foramen. The preparation shapes of 10 root canal preparation systems were calculated and compared with the root dimensions to determine the remaining dentin thickness. Eight post brands were compared with root dimensions to determine the areas where there was less than 1 mm dentin thickness. RESULTS The average root canal preparation shape produced canal diameters of 0.57 mm at 5 mm from the canal terminus and 0.94 mm at 13 mm from the canal terminus. The mean post size tip diameter was 1.03 mm, which is larger than the dimensions of the average canal preparation. Post preparation would result in less than 1 mm of dentin thickness remaining in premolars, smaller roots of molars, and mandibular incisors. The area with less than 1 mm of dentin thickness was around the post tip. CONCLUSIONS Endosequence Fiber Post (Brasseler USA), RelyX Fiber Post 3D (3M), and Rebilda (VOCO) were the better fitting posts with the root canal preparation shapes. PRACTICAL IMPLICATIONS Many posts would result in less than 1 mm dentin thickness. Clinicians should use posts that fit their root canal preparations to minimize dentin removal.
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Assessing dentists' knowledge and experience in restoring endodontically treated teeth using post & cores. J Dent 2021; 114:103815. [PMID: 34560225 DOI: 10.1016/j.jdent.2021.103815] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2021] [Revised: 09/09/2021] [Accepted: 09/13/2021] [Indexed: 11/21/2022] Open
Abstract
OBJECTIVES The restoration of endodontically, heavily filled teeth has been a challenge for the dental profession for decades. The aims of this study were to investigate dentists' experience and knowledge in the use of post & core when restoring endodontically treated teeth. METHOD This was a mixed method study incorporating quantitative and qualitative data collection. An online questionnaire was developed and distributed, comprised of 18 questions. It was calculated that 93 respondents were needed to validate the study of which 60% should meet a minimum knowledge requirement. RESULTS 173 respondents completed the questionnaire. 109 (63% (95%CI56%,70%) demonstrated proficient knowledge of post & core restorations. Recent graduates were more likely to follow current guidelines (F = 4.570: P<0.034). As the age of respondent dentists increases the number of posts placed (F = 18.85; p<0.001) and the perceived confidence level increases (Spearman's Rho 0.43: P<0.01). Experience of postgraduate education also positively influenced clinical confidence. CONCLUSION The placement of post & cores is influenced by age. Confidence is also influenced by age. More evidence on post usage is required and several questions remain to be answered on what drives decision making and perceived long-term success. CLINICAL SIGNIFICANCE There is a general acceptance of when a post and core restoration should be used. Clinician experience and age can have an impact on what type of restorations are used. Fibre posts are more commonly used due their accessibility and cost.
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Alhajj MN, Qi CH, Sayed ME, Johari Y, Ariffin Z. Fracture Resistance of Titanium and Fiber Dental Posts: A Systematic Review and Meta-Analysis. J Prosthodont 2021; 31:374-384. [PMID: 34499376 DOI: 10.1111/jopr.13428] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/03/2021] [Indexed: 11/26/2022] Open
Abstract
PURPOSE The fracture resistance of dental post systems is influenced by the material of the post. The purpose of this systematic review and meta-analysis was to assess if there is a difference in fracture resistance between prefabricated dental titanium posts and fiber posts. METHODS An online electronic search was performed using the PubMed, Scopus, and Web of Science databases for in vitro studies published from 2010 to 2020 in English. The retrieved eligible studies that compared the fracture resistance of titanium and fiber posts on human teeth were selected. The pooled standardized mean difference (SMD) with a 95% confidence interval was calculated. In addition, the trial sequential analysis (TSA) was performed to test if the available studies are sufficient to make conclusive evidence. RESULTS Of the 1165 retrieved studies, 17 studies were included in the qualitative analysis, while 16 studies were included in the quantitative analysis. Because of the high heterogeneity among studies, data from 10 studies were pooled and submitted to TSA. A total of 852 teeth were evaluated for fracture of the posts in 27 independent comparison groups. The pooled effect of the residual studies revealed no significant difference between titanium and fiber posts (SMD = -0.12; 95% CI = -0.30, 0.06; p = 0.20). Results of the TSA revealed no conclusive evidence. CONCLUSIONS The results of the current evidence revealed no significant difference between fiber and titanium posts. The evidence is insufficient, and more standardized in vitro studies are required.
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Affiliation(s)
- Mohammed Nasser Alhajj
- Prosthodontics Unit, School of Dental Sciences, Health Campus, Universiti Sains Malaysia, Kelantan, Malaysia.,Department of Prosthodontics, Faculty of Dentistry, Thamar University, Dhamar, Yemen
| | - Chong Hui Qi
- Prosthodontics Unit, School of Dental Sciences, Health Campus, Universiti Sains Malaysia, Kelantan, Malaysia
| | - Mohammed E Sayed
- Department of Prosthetic Dental Sciences, College of Dentistry, Jazan University, Jazan, Saudi Arabia
| | - Yanti Johari
- Prosthodontics Unit, School of Dental Sciences, Health Campus, Universiti Sains Malaysia, Kelantan, Malaysia
| | - Zaihan Ariffin
- Prosthodontics Unit, School of Dental Sciences, Health Campus, Universiti Sains Malaysia, Kelantan, Malaysia
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Grayli E, Dashtban A, Shadan L, Behnampour N, Afshari E. Effect of MTA versus CEM apical plugs on fracture resistance of endodontically treated simulated immature teeth restored with cast metal posts: an in-vitro study. BMC Oral Health 2021; 21:280. [PMID: 34049533 PMCID: PMC8164227 DOI: 10.1186/s12903-021-01641-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2021] [Accepted: 05/17/2021] [Indexed: 12/31/2022] Open
Abstract
BACKGROUND Endodontically treated immature teeth which are restored with cast metal posts are of the most susceptible teeth to fracture. An apical plug is usually used as root end filling in order to seal the wide apical foramen. The current study was performed to evaluate the effect of different apical plug materials (MTA and Calcium enriched mixture cement) at varied thicknesses on fracture resistance of teeth restored with cast metal posts. METHODS A total of 40 extracted intact single-rooted human mandibular premolars (removed for orthodontic reasons) were used in the study. The coronal part of each tooth was removed and root canal preparation was performed. A size 4 Gates Glidden drill was used to enlarge the canal and was passed through the apical foramen in order to simulate an immature apex. Samples were randomly divided into 5 groups (n = 8) according to apical plug (control group: No plug, group MTA5: 5 mm MTA plug, group CEM5: 5 mm CEM plug, group MTA3: 3 mm MTA plug, group CEM3: 3 mm CEM plug). Post-space preparations were performed and cast metal post-and-cores were fabricated and cemented. Fracture resistance was assessed using a universal testing machine. Fracture thresholds were recorded and data were analyzed using One-way ANOVA and Dunnett's T3 tests with significance level at P value < 0.05. RESULTS The analysis showed a significant difference of fracture resistance between groups (P value < 0.05). The mean fracture resistance of samples in control group was significantly lower than MTA5 (P value = 0.003). There was no significant difference between other groups (P value > 0.05). CONCLUSIONS Within the limits of this study, the evidence indicated that placement of a 5 mm MTA apical plug increased the fracture resistance in simulated immature teeth which are restored with cast metal posts, compared to control group (gutta-percha and sealer). While the results were not as promising for a 3 mm MTA apical plug or either 3 or 5 mm CEM apical plug.
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Affiliation(s)
- Ensieh Grayli
- grid.411747.00000 0004 0418 0096Department of Edndodontics, Gorgan School of Dentistry, Golestan University of Medical Sciences, Gorgan, Golestan Iran
| | - Abbas Dashtban
- grid.411747.00000 0004 0418 0096Gorgan School of Dentistry, Golestan University of Medical Sciences, Gorgan, Golestan Iran
| | - Leyla Shadan
- grid.411747.00000 0004 0418 0096Department of Prosthodontics, Gorgan School of Dentistry, Golestan University of Medical Sciences, Gorgan, Golestan Iran
| | - Naser Behnampour
- grid.411747.00000 0004 0418 0096Department of Biostatics and Epidemiology, Health Management and Social Development Research Center, Golestan University of Medical Sciences, Gorgan, Golestan Iran
| | - Elham Afshari
- grid.411747.00000 0004 0418 0096Department of Pediatric Dentistry, Gorgan School of Dentistry, Golestan University of Medical Sciences, Gorgan, Golestan Iran
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Wahab FK, Mahasneh SA, Sawair FA, Hamdan MA, Hattar SN, AL-Rabab’ah MA. Restoration of Root Filled Teeth; Current Opinions and Techniques. Open Dent J 2021. [DOI: 10.2174/1874210602115010071] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
Purpose:
To examine current decision-making preferences of Jordanian dentists when Restoring Root Filled Teeth (RFT).
Materials and Methods:
834 Jordanian general dentists, prosthodontists and endodontists were invited to participate in a validated online survey with a 62% participation rate. Respondents were invited to answer 24 questions about their preferences for techniques and materials they use to restore RFT. The questions aimed at exploring restorative strategies commonly employed by Jordanian dentists when managing root filled teeth with extensive loss of tooth structure.
Results:
A minority of dentists consider direct resin restoration as the sole restoration for RFT with extensive loss of tooth structure. Full coverage metal-ceramic and all-ceramic crowns are more popular than endocrowns when restoring RFT with indirect restoration. Fiber posts are the most popular type of posts, followed by prefabricated metal posts. Glass ionomer is the most preferred cement for luting metal posts, while conventional dual resin cement with separate etch and rinse bonding strategy is the most employed when bonding fiber posts. The majority of dentists tend not to pretreat fiber posts. Loss of post/core retention or fracture of coronal tooth structure are the two most common reasons observed by dentists when RFT fail.
Conclusion:
Use of post and core is still preferred over more conservative approaches when restoring RFT with extensive loss of coronal tooth structure. Longevity of restorations can be enhanced by training practicing dentists on evidence-based adhesive strategies.
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Pultanasarn P, Thaungwilai K, Singhatanadgid P, Prateepsawangwong B, Singhatanadgit W. Composite core-supported stainless steel crowns enhance fracture resistance of severely damaged primary posterior teeth. PEDIATRIC DENTAL JOURNAL 2020. [DOI: 10.1016/j.pdj.2020.07.001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Elsubeihi ES, Aljafarawi T, Elsubeihi HE. State of the Art Contemporary Prefabricated Fiber-Reinforced Posts. Open Dent J 2020. [DOI: 10.2174/1874210602014010313] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Background:
There is an increased interest in investigating and use of prefabricated fiber-reinforced posts by scientists and clinicians in the restoration of endodontically treated teeth.
Objective:
The objective of this narrative review was to summarize the composition of contemporary prefabricated fiber-reinforced posts and elucidate its effect on the different properties of these posts.
Methods:
PubMed/Medline, Scopus, and Google Scholar were searched from January 1990 to December 2019 for English Language articles describing the composition and properties of prefabricated fiber-reinforced posts. First, the search strategy was established for Medline / PubMed using the following terms ((Fiber post[All Fields] OR (fiber reinforced post[All Fields] AND composition[All Fields] AND (“matrix”[MeSH Terms] OR (“fiber”[All Fields] AND “properties”[All Fields] AND “epoxy”[All Fields]) OR “dimethacrylate”[All Fields]) AND NOT (CAD CAM[All Fields])). The search strategy was then adapted for Scopus and Google Scholar databases to identify eligible studies.
Results:
The current state of the art of prefabricated fiber-reinforced posts revealed a myriad of products with different formulations which are reflected on the mechanical and handling characteristics of the different posts available in the market. More recent research and development efforts attempted to address issues related to the improved transmission of polymerization light through the post to the most apical end of the restoration inside the root canal. Others focused on the development of new matrix materials for fiber-reinforced posts.
Conclusion:
A review of the literature revealed that currently available prefabricated fiber-reinforced posts consist of a heterogeneous group of materials which can have a significant effect on the behavior of posts. Understanding different formulations will help clinicians in scrutinizing the vast literature available on prefabricated fiber-reinforced posts. This, in turn, will help them make an informed decision when selecting materials for the restoration of endodontically treated teeth.
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A comparison of the fracture resistance of premolars without a ferrule with different post systems. J Prosthet Dent 2019; 123:523.e1-523.e5. [PMID: 31753456 DOI: 10.1016/j.prosdent.2019.08.018] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/01/2019] [Revised: 08/06/2019] [Accepted: 08/06/2019] [Indexed: 11/21/2022]
Abstract
STATEMENT OF PROBLEM Which type of post improves the performance of endodontically treated mandibular premolars without a ferrule remains unclear. PURPOSE The purpose of this in vitro study was to compare the restoration of endodontically treated mandibular premolars without a ferrule by using different post systems. MATERIAL AND METHODS Thirty extracted mandibular premolars were endodontically treated, and their crowns removed. They were divided into 3 groups with different post systems (n=10): zirconia ceramic posts (ZRPs), fiber posts (FPs), and bundled glass fiber-reinforced composite resin posts (GTPs). After post placement and core fabrication, computer-aided design and computer-aided manufacture (CAD-CAM) lithium disilicate crowns were cemented. The specimens were subjected to thermocycling and mastication simulation before a fracture test in a universal testing machine. The maximum load at which the fracture occurred was recorded, and the fractured specimens were examined by using an optical microscope. The data were analyzed for statistical differences with a 1-way ANOVA and the Tukey honestly significant difference post hoc test (α=.05). RESULTS No statistically significant difference in fracture strength was found among the groups (P=.970). From the light microscopy examination, catastrophic failure was observed in all specimens, and there was no failure of the ceramic crowns. CONCLUSIONS Based on the findings of this in vitro study, the choice of post material with a low or high modulus of elasticity did not prevent catastrophic failures in endodontically treated teeth without a ferrule.
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Barbosa Kasuya AV, Favarão IN, Machado AC, Rezende Spini PH, Soares PV, Fonseca RB. Development of a fiber-reinforced material for fiber posts: Evaluation of stress distribution, fracture load, and failure mode of restored roots. J Prosthet Dent 2019; 123:829-838. [PMID: 31590983 DOI: 10.1016/j.prosdent.2019.04.026] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2018] [Revised: 04/26/2019] [Accepted: 04/26/2019] [Indexed: 11/28/2022]
Abstract
STATEMENT OF PROBLEM The biomechanical behavior of post-restored roots with an experimental fiber-reinforced composite resin is unknown. PURPOSE The purpose of this in vitro study was to investigate the biomechanical behavior of an experimental composite resin (3-mm short glass fiber incorporated in methacrylate matrix with filler particles) used to produce the custom post itself or to reline fiber posts. MATERIAL AND METHODS Four testing groups (n=10) were created according to the root restoration method: FG, commercially available fiber post; FG+RC, fiber post relined with conventional composite resin; FG+EXP, fiber post relined with the experimental composite resin; and EXP, a custom post made of experimental composite resin. A three-dimensional finite element linear elastic analysis was performed by using geometric representations of groups, and the results were analyzed by von Mises (σvM) and maximum principal stress criteria. In sequence, 40 bovine incisors were assigned to these groups and subjected to a fracture load test (Instron 5965; 0.5 mm/min), and the failure mode was determined. RESULTS The EXP group showed more homogeneous stress distribution for σvM. ANOVA and the Tukey honestly significant difference (HSD) tests showed significant differences (P<.001) in fracture load (mean ±standard deviation; different superscript letters indicate statistical difference): FG+EXP (669.5 ±107.7)A; FG (620.7 ±59.2)A; EXP (506.5 ±27.0)B; FG+RC (452.7 ±81.6)B. No differences were found for failure mode (P=.595). CONCLUSIONS The experimental composite resin significantly increases fracture load when used to reline commercially available fiber posts and, irrespective of its use, presented lower stress concentration.
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Affiliation(s)
- Amanda Vessoni Barbosa Kasuya
- Professor, Department of Operative Dentistry, Dental School, University of West Paulista (UNOESTE), Presidente Prudente, Brazil.
| | - Isabella Negro Favarão
- Doctoral student, Departament of Operative Dentistry and Dental Materials, Dental School, Federal University of Goiás (UFG), Goiânia, Brazil
| | - Alexandre Coelho Machado
- Doctoral student and NCCL research group member, Department of Operative Dentistry and Dental Materials, Dental School, Federal University of Uberlândia (UFU), Uberlândia, Brazil
| | - Pedro Henrique Rezende Spini
- NCCL research group member, Department of Operative Dentistry and Dental Materials, Dental School, Federal University of Uberlândia (UFU), Uberlândia, Brazil
| | - Paulo Vinícius Soares
- Professor and NCCL research group coordinator, Department of Operative Dentistry and Dental Materials, Dental School, Federal University of Uberlândia (UFU), Uberlândia, Brazil
| | - Rodrigo Borges Fonseca
- Professor, Department of Operative Dentistry and Dental Materials, Dental School, Federal University of Goiás (UFG), Goiânia, Brazil
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Martino N, Truong C, Clark AE, O'Neill E, Hsu SM, Neal D, Esquivel-Upshaw JF. Retrospective analysis of survival rates of post-and-cores in a dental school setting. J Prosthet Dent 2019; 123:434-441. [PMID: 31353108 DOI: 10.1016/j.prosdent.2019.05.003] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2018] [Revised: 04/16/2019] [Accepted: 05/02/2019] [Indexed: 11/16/2022]
Abstract
STATEMENT OF PROBLEM The clinical survival of different types of post-and-core systems requires assessment. PURPOSE The purpose of this retrospective clinical study was to evaluate the clinical survival rate (CSR) of custom-fabricated cast metal and prefabricated (both metal- and fiber-reinforced composite resin post) post-and-cores as a function of patient- and restoration-related variables. MATERIAL AND METHODS A retrospective analysis was conducted on electronic charts indicating that these patients had received some type of post-and-core between January 2003 and January 2018. A total of 754 records were included in the analysis based on the inclusion criteria. Data were analyzed by using the Kaplan-Meier and Cox proportional hazards analysis. RESULTS Kaplan-Meier analysis demonstrated the mean survival time for each group to be 12.0 years for fiber-reinforced composite resin posts, 11.8 years for cast metal post-and-cores, and 10.2 years for prefabricated metal posts. Although the mean survival time differed by 1.8 years among groups, with prefabricated metal posts having a slightly higher risk of failure, this effect was not statistically significant (P=.067). The effect of post type also failed to reach significance when controlling for patient demographics and post position in a Cox proportional hazards analysis (P=.106). However, the Cox model did show that survival was associated with tooth position (P=.003), cement (P=.021), and type of restoration (P<.001). CONCLUSIONS Analysis showed no evidence that post-and-core survival was significantly associated with 3 types of post-and-cores (custom-fabricated metal, prefabricated metal, and prefabricated fiber-reinforced composite resin). The percentage of root in the bone, tooth position, cement, and type of restoration, however, were significantly associated with survival.
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Affiliation(s)
- Nicole Martino
- Graduate Prosthodontic resident, Graduate Prosthodontics Program, Restorative Dental Sciences, University of Florida College of Dentistry, Gainesville, Fla
| | - Caroline Truong
- Graduate Prosthodontic resident, Graduate Prosthodontics Program, Restorative Dental Sciences, University of Florida College of Dentistry, Gainesville, Fla
| | - Arthur E Clark
- Professor, Restorative Dental Sciences, Division of Prosthodontics, University of Florida College of Dentistry, Gainesville, Fla
| | - Edgar O'Neill
- Clinical Associate Professor, Restorative Dental Sciences, Graduate Prosthodontics Program, University of Florida College of Dentistry, Gainesville, Fla
| | - Shu-Min Hsu
- Research Associate, Restorative Dental Sciences, Division of Prosthodontics, University of Florida College of Dentistry, Gainesville, Fla
| | - Dan Neal
- Senior Statistician, Department of Neurosurgery, University of Florida College of Medicine, Gainesville, Fla
| | - Josephine F Esquivel-Upshaw
- Associate Professor, Restorative Dental Sciences, University of Florida College of Dentistry, Division of Prosthodontics, Gainesville, Fla.
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Gulabivala K, Ng YL. Value of root-filled teeth in maintaining a functional dentition for life. Br Dent J 2019; 226:769-784. [DOI: 10.1038/s41415-019-0313-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Hendi AR, Moharrami M, Siadat H, Hajmiragha H, Alikhasi M. The effect of conventional, half-digital, and full-digital fabrication techniques on the retention and apical gap of post and core restorations. J Prosthet Dent 2019; 121:364.e1-364.e6. [PMID: 30598306 DOI: 10.1016/j.prosdent.2018.09.014] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2018] [Revised: 09/18/2018] [Accepted: 09/19/2018] [Indexed: 11/24/2022]
Abstract
STATEMENT OF PROBLEM Conventional cast metal posts and cores are fabricated using direct and indirect techniques, both of which need impression materials and considerable laboratory work. Digital techniques have the capacity to substitute for conventional methods in fabricating the posts and cores. However, the accuracy of restorations resulting from a digital workflow is unknown. PURPOSE The purpose of this in vitro study was to compare the retention of posts and cores fabricated using full-digital, half-digital, and conventional techniques and to define the accuracy of each technique in terms of the apical gap. METHOD AND MATERIALS Thirty newly extracted mandibular first and second premolar teeth were selected for this in vitro study. Impressions were made using direct acrylic resin patterns (conventional), indirect silicone impressions of the intracanal which scanned with a 3Shape laboratory scanner (half digital), and intracanal scan posts captured with an intraoral 3Shape scanner (full digital). Casting and milling were conducted for the conventional impression and digital scans. The obtained posts were cemented using zinc phosphate cement. A universal pullout test was used to measure retention at a crosshead speed of 0.5 mm/min. The apical gap of each post in the canals was defined with parallel digital radiography. The data were analyzed using the Kruskal-Wallis test (α=.05) and Mann-Whitney test at the adjusted α=.016. RESULTS Significant differences were found among the conventional, full-digital, and half-digital techniques in terms of the apical gap (0.11, 0.29, and 0.66 mm; P<.001) and retention (171.6 ±1.9, 107.1 ±5.6 and 91.8 ±6.6 N; P<.001). The correlation between gap and retention in conventional (P=.43), full-digital (P=.09), and half-digital techniques (P=.06) was not statistically significantly different. CONCLUSIONS The conventional technique was more accurate and resulted in higher retention than both the full- and half-digital techniques. However, the retention and gap of all the posts fell within clinical guidelines.
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Affiliation(s)
- Amir Reza Hendi
- Assistant Professor, Dental Sciences Research Center, Department of Prosthodontics, School of Dentistry, Guilan University of Medical Sciences, Rasht, Iran
| | - Mohammad Moharrami
- Dentist, Dental Research Center, Dentistry Research Institute, Tehran University of Medical Sciences, Tehran, Iran
| | - Hakimeh Siadat
- Professor, Dental Research Center, Dentistry Research Institute, Department of Prosthodontics, Tehran University of Medical Sciences, Tehran, Iran
| | - Habib Hajmiragha
- Assistant Professor, Department of Prosthodontics, Tehran University of Medical Sciences, Tehran, Iran
| | - Marzieh Alikhasi
- Associate Professor, Dental Research Center, Dentistry Research Institute, Department of Prosthodontics, Tehran University of Medical Sciences, Tehran, Iran.
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Soares CJ, Rodrigues MDP, Faria-e-Silva AL, Santos-Filho PCF, Veríssimo C, Kim HC, Versluis A. How biomechanics can affect the endodontic treated teeth and their restorative procedures? Braz Oral Res 2018; 32:e76. [DOI: 10.1590/1807-3107bor-2018.vol32.0076] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2018] [Accepted: 06/13/2018] [Indexed: 11/22/2022] Open
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Fracture Resistance of Endodontically Treated Anterior Teeth Restored with Different Post Systems: An In Vitro Study. Eur Endod J 2018; 3:174-178. [PMID: 32161874 PMCID: PMC7006576 DOI: 10.14744/eej.2018.70299] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2018] [Revised: 06/13/2018] [Accepted: 06/13/2018] [Indexed: 11/20/2022] Open
Abstract
Objective: This in vitro study aimed to evaluate the fracture resistance of endodontically treated maxillary central incisors with different post systems. Methods: Fifty-six extracted intact maxillary permanent central incisors were used, treated endodontically (except for the control group), and distributed into the following seven test groups (n=8) depending on the post type: UHT (control group: root-filled teeth without endodontic post), ZRP (prefabricated zirconia post), GFP (prefabricated glass fiber post), CFP (prefabricated carbon fiber post), CPC (custom-made cast post and core), TIP (prefabricated titanium post), and MIP (prefabricated mixed post). The specimens were loaded in a universal testing machine until fracture occurrence. Failure loads were then analyzed with one-way analysis of variance (ANOVA), followed by multiple comparisons by using Tukey’s honest significant difference test (α=0.05). Results: Mean (SD) failure loads for groups ranged from 524±73.2 N for CPC to 764.1±156 N for GFP. One-way ANOVA showed significant differences in terms of fracture resistances among groups (P<0.001). Tukey’s honest significant difference test showed significant differences in fracture resistance within groups (P≤0.05), whereas no difference was observed between the UHT (control group) and CFP and CPC groups (P≥0.05). Conclusion: Endodontically treated teeth restored with zirconia post, glass fiber post, titanium post, or mixed post were more resistant to fracture loads compared with those that were not restored (control group) or restored with either carbon fiber post or cast post and core.
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Caldas RA, Bacchi A, Barão VA, Versluis A. Should adhesive debonding be simulated for intra-radicular post stress analyses? Dent Mater 2018; 34:1331-1341. [DOI: 10.1016/j.dental.2018.06.025] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2018] [Revised: 05/11/2018] [Accepted: 06/07/2018] [Indexed: 11/16/2022]
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Sambrook R, Burrow M. A survey of Australian prosthodontists: the use of posts in endodontically treated teeth. Aust Dent J 2018; 63:294-301. [PMID: 29741784 DOI: 10.1111/adj.12620] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/01/2018] [Indexed: 11/28/2022]
Abstract
BACKGROUND This study aimed to gain insight into common practises of Australian prosthodontists when placing a post in an endodontically treated tooth (ETT). METHODS A 17-question open- and closed-format questionnaire was sent to registered Australian prosthodontists. The response rate was 55% (N = 95). RESULTS The majority of respondents indicated the purpose of a post was to retain a core (N = 94, 99%). The decision to place a post is affected by the quantity of remaining tooth structure (N = 91, 96%) and the definitive restoration (N = 68, 72%). The ideal post length is neither a short nor long post with the most frequent response (N = 52, 34%) being 'as long as possible without disturbing the apical seal'. The apical seal requirements were defined as 4-5 mm of gutta-percha for 77% of respondents. The most preferred post type was a custom cast metal post (N = 85, 49%). The most popular luting cement was resin composite (N = 84, 39%). CONCLUSIONS The results from this survey do not provide a definitive guide for restoring an ETT. However, it illustrates how Australian prosthodontists address this clinical challenge. The multiple responses received for a number of questions suggest that the material and technique employed in the Australian context is influenced by the individual clinical case.
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Affiliation(s)
- R Sambrook
- Clinical Lecturer, UCL Eastman Dental Institute, London
| | - M Burrow
- Clinical Professor in Prosthodontics, Faculty of Dentistry, University of Hong Kong, Hong Kong, China
- The University of Melbourne - Melbourne Dental School, Melbourne, Victoria, Australia
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Naumann M, Sterzenbach G, Dietrich T, Bitter K, Frankenberger R, von Stein-Lausnitz M. Dentin-like versus Rigid Endodontic Post: 11-year Randomized Controlled Pilot Trial on No-wall to 2-wall Defects. J Endod 2017; 43:1770-1775. [PMID: 28951033 DOI: 10.1016/j.joen.2017.06.030] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2017] [Revised: 06/14/2017] [Accepted: 06/26/2017] [Indexed: 10/18/2022]
Abstract
INTRODUCTION This is the first long-term randomized controlled trial to evaluate dentin-like glass fiber posts (GFPs) compared with rather rigid titanium posts (TPs) for post-endodontic restoration of severely damaged endodontically treated teeth with 2 or fewer remaining cavity walls. METHODS Ninety-one subjects in need of post-endodontic restorations were randomly assigned to receive either a tapered GFP (n = 45) or TP (n = 46). Posts were adhesively luted by using self-adhesive resin cement, followed by composite core build-up and preparation of 2-mm ferrule design. Primary end point was loss of restoration for any reason. Kaplan-Meier curves were constructed, and log-rank test was calculated (P < .05). RESULTS After a follow-up of 132 months, 17 GFP and 20 TP restorations survived, and 19 failed (12 GFP, 7 TP). Failure modes for GFP were root fracture (n = 4), core fracture (n = 1), secondary caries (n = 1), endodontic failure (n = 2), extraction because of tooth mobility grade III associated with insufficient design of removable partial denture (n = 1), tooth fracture (n = 1), and changes in treatment plan (n = 2); failure modes for TP were endodontic failure (n = 5), root fracture (n = 1), and 1 extraction for other reasons. Cumulative survival probability was 58.7% for GFP and 74.2% for TP. CONCLUSIONS When using self-adhesively luted prefabricated posts, resin composite core build-up, and 2-mm ferrule to reconstruct severely damaged endodontically treated teeth, tooth survival is not influenced by post rigidity. Survival decreased rapidly after 8 years of observation in both groups.
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Affiliation(s)
- Michael Naumann
- Department of Prosthodontics, Geriatric Dentistry and Craniomandibular Disorders, Charité-Universitätsmedizin Berlin, Freie Universität Berlin, Humboldt-Universität zu Berlin, Berlin, Germany, and Department of Prosthodontics, Berlin Institute of Health, Geriatric Dentistry and Craniomandibular Disorders, Berlin, Germany
| | - Guido Sterzenbach
- Department of Prosthodontics, Geriatric Dentistry and Craniomandibular Disorders, Charité-Universitätsmedizin Berlin, Freie Universität Berlin, Humboldt-Universität zu Berlin, Berlin, Germany, and Department of Prosthodontics, Berlin Institute of Health, Geriatric Dentistry and Craniomandibular Disorders, Berlin, Germany
| | - Thomas Dietrich
- Department of Oral Surgery, School of Dentistry, University of Birmingham, Edgbaston, Birmingham, United Kingdom
| | - Kerstin Bitter
- Department of Operative and Preventive Dentistry, Charité-Universitätsmedizin Berlin, Berlin, Germany
| | - Roland Frankenberger
- Department of Operative Dentistry and Endodontology, University of Marburg, Marburg, Germany
| | - Manja von Stein-Lausnitz
- Department of Prosthodontics, Geriatric Dentistry and Craniomandibular Disorders, Charité-Universitätsmedizin Berlin, Freie Universität Berlin, Humboldt-Universität zu Berlin, Berlin, Germany, and Department of Prosthodontics, Berlin Institute of Health, Geriatric Dentistry and Craniomandibular Disorders, Berlin, Germany.
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Lazari PC, de Carvalho MA, Del Bel Cury AA, Magne P. Survival of extensively damaged endodontically treated incisors restored with different types of posts-and-core foundation restoration material. J Prosthet Dent 2017; 119:769-776. [PMID: 28923548 DOI: 10.1016/j.prosdent.2017.05.012] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2016] [Revised: 05/17/2017] [Accepted: 05/18/2017] [Indexed: 10/18/2022]
Abstract
STATEMENT OF PROBLEM Which post-and-core combination will best improve the performance of extensively damaged endodontically treated incisors without a ferrule is still unclear. PURPOSE The purpose of this in vitro study was to investigate the restoration of extensively damaged endodontically treated incisors without a ferrule using glass-ceramic crowns bonded to various composite resin foundation restorations and 2 types of posts. MATERIAL AND METHODS Sixty decoronated endodontically treated bovine incisors without a ferrule were divided into 4 groups and restored with various post-and-core foundation restorations. NfPfB=no-ferrule (Nf) with glass-fiber post (Pf) and bulk-fill resin foundation restoration (B); NfPfP=no-ferrule (Nf) with glass-fiber post (Pf) and dual-polymerized composite resin core foundation restoration (P); NfPt=no-ferrule (Nf) with titanium post (Pt) and resin core foundation restoration; and NfPtB=no-ferrule (Nf) with titanium post (Pt) and bulk-fill resin core foundation restoration (B). Two additional groups from previously published data from the same authors (FPf=2mm of ferrule (F) and glass-fiber post (Pf) and composite resin core foundation restoration; and NfPf=no-ferrule (Nf) with glass-fiber post (Pf) and composite resin core foundation restoration), which were tested concomitantly and using the same experimental arrangement, were included for comparison. All teeth were prepared to receive bonded glass-ceramic crowns luted with dual-polymerized resin cement and were subjected to accelerated fatigue testing under submerged conditions at room temperature. Cyclic isometric loading was applied to the incisal edge at an angle of 30 degrees with a frequency of 5 Hz, beginning with a load of 100 N (5000 cycles). A 100-N load increase was applied every 15000 cycles. The specimens were loaded until failure or to a maximum of 1000 N (140000 cycles). The 6 groups (4 groups from the present study and 2 groups from the previously published study) were compared using the Kaplan-Meier survival analysis (log-rank post hoc test at α=.05 for pairwise comparisons). RESULTS None of the tested specimen withstood all 140 000 cycles. All specimens without a ferrule were affected by an initial failure phenomenon (wide gap at the lingual margin between the core foundation restoration/crown assembly and the root). NfPfP, NfPt, and NfPtB had similar survival (29649 to 30987 mean cycles until initial failure). NfPfB outperformed NfPt and NfPtB. None of the post-and-core foundation restoration materials were able to match the performance of the ferrule group FPf (72667 cycles). In all groups, 100% of failures were catastrophic. CONCLUSIONS The survival of extensively damaged endodontically treated incisors without a ferrule was slightly improved by the use of a fiber post with a bulk-fill composite resin core foundation restoration. However, none of the post-and-core techniques was able to compensate for the absence of a ferrule. The presence of the posts always adversely affected the failure mode.
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Affiliation(s)
- Priscilla Cardoso Lazari
- Predoctoral student, Department of Prosthodontics and Periodontology, Piracicaba Dental School, State University of Campinas, Piracicaba, Brazil
| | - Marco Aurélio de Carvalho
- Predoctoral student, Department of Prosthodontics and Periodontology, Piracicaba Dental School, State University of Campinas, Piracicaba, Brazil
| | - Altair A Del Bel Cury
- Professor, Department of Prosthodontics and Periodontology, Piracicaba Dental School, State University of Campinas, Piracicaba, Brazil
| | - Pascal Magne
- The Don and Sybil Harrington Professor of Esthetic Dentistry, Division of Restorative Sciences, Ostrow School of Dentistry, University of Southern California, Los Angeles, Calif.
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Chen A. 2016 ASE undergraduate essay competition candidate information. AUST ENDOD J 2017. [PMID: 28620977 DOI: 10.1111/aej.12202] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The aim of this review is to discuss the role of medicaments and materials used in teeth undergoing root canal treatment and how they affect the overall prognosis of root canal treated teeth. Irrigants, medicaments and materials play a vital role in RCT. They reduce the overall microbial load within the root canal system, help reduce inter-appointment pain, and induce apexification during RCT of permanent teeth with immature apices. In addition, they also help create a hermetic coronal and periradicular seal to entomb any residual microorganisms within the canals and prevent future ingress of contaminants into the root canal system and subsequent reinfection. Whilst the role of various materials in RCT has been thoroughly investigated, the available literature and longitudinal clinical studies evaluating the affect of such materials on the prognosis of RCT is scarce, and requires further investigation.
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Affiliation(s)
- Alice Chen
- La Trobe University, Melbourne, Victoria, Australia
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Magne P, Lazari PC, Carvalho MA, Johnson T, Del Bel Cury AA. Ferrule-Effect Dominates Over Use of a Fiber Post When Restoring Endodontically Treated Incisors: An In Vitro Study. Oper Dent 2017; 42:396-406. [PMID: 28402738 DOI: 10.2341/16-243-l] [Citation(s) in RCA: 46] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
OBJECTIVES The aim of this study was to investigate the restoration of broken-down endodontically treated incisors with the ferrule effect using glass ceramic crowns bonded to composite resin core buildups with or without a fiber post. A no-ferrule group with post was also included for comparison. METHODS AND MATERIALS Thirty decoronated endodontically treated bovine incisors with a 2-mm ferrule were restored with a direct buildup using a nanohybrid direct composite resin (Miris 2 and Optibond FL) with or without a glass-fiber-reinforced post. An additional group of 15 teeth without a ferrule were restored with buildup and a fiber post. All teeth were prepared to receive bonded glass ceramic crowns (e.max CAD luted with Variolink Esthetic DC) and were subjected to accelerated fatigue testing. Cyclic isometric loading was applied to the incisal edge at an angle of 30° and a frequency of 5 Hz, beginning with a load of 100 N (×5000 cycles). A 100 N load increase was applied each 15,000 cycles. Specimens were loaded until failure or to a maximum of 1000 N (×140,000 cycles). Groups were compared using the Kaplan Meier survival analysis (log rank test at p=0.05). RESULTS None of the tested specimens withstood all 140,000 load cycles. Specimens with posts but without a ferrule were affected by an initial failure phenomenon (wide gap at the lingual margin between the buildup/crown assembly and the root). There was a significant difference in mean survived cycles between the ferrule groups (Fp=73,332× and FNp=73,244×) and the no-ferrule group (50,121×; p=0.001). The addition of a fiber post was not significant in the presence of the ferrule (p=0.884). In both groups with posts, 100% of failures were unrestorable. The no-post group had 47% of restorable and possibly restorable failures. CONCLUSIONS The survival of broken-down nonvital incisors was improved by the presence of the ferrule but not by the fiber-reinforced post. Fiber posts were always detrimental to the failure mode and were not able to compensate for the absence of a ferrule.
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Biomechanical behavior of endodontically treated premolars using different preparation designs and CAD/CAM materials. J Dent 2017; 59:54-61. [PMID: 28214537 DOI: 10.1016/j.jdent.2017.02.007] [Citation(s) in RCA: 47] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2016] [Revised: 02/07/2017] [Accepted: 02/13/2017] [Indexed: 11/22/2022] Open
Abstract
OBJECTIVES To evaluate the effect of restoration design ('2.5-mm deep endocrown', '5-mm deep endocrown' or '5-mm deep post&crown') and CAD/CAM material type (composite or lithium disilicate glass-ceramic) on the load-to-failure of endodontically treated premolars in absence of any ferrule. METHODS The crowns of 48 single-rooted premolars were cut and the roots were endodontically treated. Teeth were randomly divided into six groups (n=8); teeth in each group were restored using one of the two tested materials with standardized CAD/CAM fabricated endocrowns (with either 2.5-mm or 5-mm deep intra-radicular extension) or conventional crowns (5-mm deep post&crown). After cementation using luting composite, the specimens were immersed in distilled water and subjected to 1,200,000 chewing cycles with a load of 50N applied parallel to the long axis of the tooth (0°). After cyclic loading, a compressive load was applied at 45° to the tooth's long axis using a universal testing machine until failure. Load-to-failure was recorded (N) and the specimens were examined under a stereomicroscope with 3.5x magnification to determine the mode of failure. RESULTS All specimens survived the 1,200,000 chewing cycles. A significant interaction between restoration design and CAD/CAM material was found using two-way ANOVA. In the '2.5-mm deep endocrown' groups, the composite achieved a significantly higher load-to-failure than the lithium disilicate glass-ceramic, while no differences between materials were found in the '5-mm deep endocrown' and '5-mm deep post&crown' groups. More unfavorable failures (root fractures) were observed for higher load-to-failure values. CONCLUSIONS Only following a '2.5-mm deep endocrown' design, composite appeared more favorable than lithium disilicate glass-ceramic as crown material; this may be explained by their difference in elastic modulus. CLINICAL SIGNIFICANCE Shallow endocrown preparations on premolars present less surface for adhesive luting and a difference in crown material becomes apparent in terms of load-to-failure. The use of a more flexible composite crown material appeared then a better option.
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Caserío Valea M, Alonso de la Peña V. Titanium posts and bonded amalgam core longevity: A 22-year clinical survival retrospective study. J Am Dent Assoc 2016; 148:75-80. [PMID: 27863694 DOI: 10.1016/j.adaj.2016.09.012] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2016] [Revised: 09/13/2016] [Accepted: 09/21/2016] [Indexed: 11/26/2022]
Abstract
BACKGROUND The authors conducted a retrospective study to evaluate the long-term (18-22 years) clinic results of titanium post and bonded amalgam core restorations with metal-ceramic crowns placed in patients. METHODS From 1992 through 1996, the authors placed 88 restorations in 66 patients. They measured the ferrule effect in the minor dentin collar area. In 2014, the authors analyzed the following variables: ferrule length, length and thickness of the post, and tooth position. RESULTS The overall survival of the restorations decreased over time with survival rates of 89.6% after 5 years of follow-up appointments and 64.2% after 18 years of follow-up appointments. There were 42 failures, and the maxillary premolars had the most failures. The teeth with 2 or more millimeters ferrule length had a higher survival rate than those with a 0 to less than 2 mm ferrule length; these results were not statistically significant. CONCLUSIONS Statistically significant differences were detected according to the location of the tooth. The cores in the anterior teeth were 3.26 times more likely to fail than those in the molars, which presented higher survival rates; maxillary premolars had the most failures (28.5%). Both the metallic post length and its diameter did not influence restoration survival. The ferrule length was not statistically significant. PRACTICAL IMPLICATIONS The clinical technique to restore endodontically treated teeth that includes a titanium post and bonded amalgam restorations results in greater coronal destruction but shows good long-term results, ease of fabrication, and modest cost in comparison with other techniques.
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Resistance of endodontically treated roots restored with different fibre post systems with or without post space preparation: in vitro analysis and SEM investigation. GIORNALE ITALIANO DI ENDODONZIA 2016. [DOI: 10.1016/j.gien.2016.09.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
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Daleprane B, Pereira CNB, Bueno AC, Ferreira RC, Moreira AN, Magalhães CS. Bond strength of fiber posts to the root canal: Effects of anatomic root levels and resin cements. J Prosthet Dent 2016; 116:416-24. [PMID: 27086107 DOI: 10.1016/j.prosdent.2016.01.030] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2015] [Revised: 01/22/2016] [Accepted: 01/22/2016] [Indexed: 11/18/2022]
Abstract
STATEMENT OF PROBLEM Decementation is one of the most frequent causes of failure in the post-cement system. The bond strength in different parts of the canal may be influenced by technical and anatomic factors. PURPOSE The purpose of this in vitro study was to assess the effects of anatomic root levels to reach the canal and different resin cements on the bond strength of fiberglass posts along the canal. MATERIAL AND METHODS One hundred thirty-five roots of bovine teeth were endodontically treated, prepared with 15-mm-long post spaces and divided according to the anatomic root level: coronal (with 15-mm post space), middle (with 10-mm post space), and apical (with 5-mm post space). Fiberglass posts were luted with the cements (n=15): conventional resin cement with 3-step etch-and-rinse adhesive system (RelyX ARC/SBMP); self-adhesive resin cement (RelyX U200) and autopolymerizing resin cement with etch-and-rinse adhesive system (C&B/All-Bond 2). After 24 hours, specimens were sectioned and subjected to the push-out test. The maximum extrusion load was recorded (0.5 mm/minute, 200 N). Data were analyzed with analysis of variance (ANOVA) and the Tukey test (α=.05). Failure mode was analyzed by using multinomial logistic regression. RESULTS There were no significant effects of resin cements (P>.05). The bond strength at apical third was higher when the canal was reached at the apical level than at the coronal level (P=.022). When each root level was directly reached, the coronal bond strength was lower than apical (P=.001) and middle (P=.021) for all cements. CONCLUSIONS When the canal was reached at the coronal, medium, and apical levels, the bond strength of conventional, self-adhesive and autopolymerizing resin cements was lower in the coronal root third.
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Affiliation(s)
| | - Carolina N B Pereira
- Adjunct Professor, Department of Dentistry, School of Management Studies, Belo Horizonte, Minas Gerais, Brazil
| | | | - Raquel C Ferreira
- Assistant Professor, Department of Social and Preventive Dentistry, School of Dentistry. Federal University of Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Allyson N Moreira
- Professor, Department of Restorative Dentistry. School of Dentistry, Federal University of Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Cláudia S Magalhães
- Associate Professor, Department of Restorative Dentistry, School of Dentistry, Federal University of Minas Gerais, Belo Horizonte, Minas Gerais, Brazil.
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Kaval ME, Akin H, Guneri P. Radiopacity of Esthetic Post Materials: Evaluation with Digital Analysis Technique. J Prosthodont 2015; 26:455-459. [PMID: 26513716 DOI: 10.1111/jopr.12386] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/13/2015] [Indexed: 01/22/2023] Open
Abstract
PURPOSE To evaluate the radiopacity of five post materials using a digital image analysis method. MATERIALS AND METHODS Twelve specimens from each post type (two zirconia and three fiber based) of 2 mm in thickness were obtained using a diamond blade mounted on a cutting machine, and digital radiographs were taken along with aluminum step-wedge and dentin discs under standard exposure conditions. The mean gray-values of specimens were measured using a computer graphics program. Data were analyzed using one-way ANOVA followed by Holm-Sidak multicomparison test (p = 0.05). RESULTS The highest radiopacity was observed in custom zirconia (5.842 millimeters of equivalent Al [mmAl]), and the lowest value was detected with FRC-Postec (Ivoclar Vivadent) (1.716 mmAl). Significant differences were revealed between the radiopacity values among all groups (p < 0.05), except the Zr post materials (p = 0.56). CONCLUSIONS All tested post materials had higher radiopacity than dentin. Further studies will be required to clarify optimum radiopacity properties of the post materials to provide a precise clinical observation.
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Affiliation(s)
- Mehmet Emin Kaval
- Department of Endodontology, School of Dentistry, Ege University, Izmir, Turkey
| | - Hakan Akin
- Faculty of Dentistry, Department of Prosthodontics, Cumhuriyet University, Sivas, Turkey
| | - Pelin Guneri
- Department of Oral and Maxillofacial Radiology, School of Dentistry, Ege University, Izmir, Turkey
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Sahafi A, Benetti AR, Flury S, Peutzfeldt A. Retention of Root Canal Posts: Effect of Cement Film Thickness, Luting Cement, and Post Pretreatment. Oper Dent 2015; 40:E149-57. [PMID: 25764045 DOI: 10.2341/14-159-l] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
SUMMARY
The aim of this study was to investigate the effect of the cement film thickness of a zinc phosphate or a resin cement on retention of untreated and pretreated root canal posts. Prefabricated zirconia posts (CosmoPost: 1.4 mm) and two types of luting cements (a zinc phosphate cement [DeTrey Zinc] and a self-etch adhesive resin cement [Panavia F2.0]) were used. After removal of the crowns of 360 extracted premolars, canines, or incisors, the root canals were prepared with a parallel-sided drill system to three different final diameters. Half the posts did not receive any pretreatment. The other half received tribochemical silicate coating according to the manufacturer's instructions. Posts were then luted in the prepared root canals (n=30 per group). Following water storage at 37°C for seven days, retention of the posts was determined by the pull-out method. Irrespective of the luting cement, pretreatment with tribochemical silicate coating significantly increased retention of the posts. Increased cement film thickness resulted in decreased retention of untreated posts and of pretreated posts luted with zinc phosphate cement. Increased cement film thickness had no influence on retention of pretreated posts luted with resin cement. Thus, retention of the posts was influenced by the type of luting cement, by the cement film thickness, and by the post pretreatment.
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Affiliation(s)
- A Sahafi
- Alireza Sahafi, DDS, PhD, private practice, Kongens Lyngby, Denmark
| | - AR Benetti
- Ana R Benetti, DDS, PhD, Section for Oral Rehabilitation, Dental Materials, and Oral Diagnostics, Department of Odontology, University of Copenhagen, Copenhagen, Denmark
| | - S Flury
- Simon Flury, DDS, Department of Preventive, Restorative, and Pediatric Dentistry, School of Dental Medicine, University of Bern, Bern, Switzerland
| | - A Peutzfeldt
- Anne Peutzfeldt, DDS, PhD, DrOdont, Department of Preventive, Restorative, and Pediatric Dentistry, School of Dental Medicine, University of Bern, Bern, Switzerland
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Sakoguchi K, Minami H, Suzuki S, Tanaka T. Evaluation of fracture resistance of indirect composite resin crowns by cyclic impact test: influence of crown and abutment materials. Dent Mater J 2014; 32:433-40. [PMID: 23719005 DOI: 10.4012/dmj.2012-313] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
This study evaluated the effect of abutment materials on the fracture resistance of composite crowns for premolars. Composite crowns were fabricated using two different indirect composite resin materials (Meta Color Prime Art or Estenia C&B) and cemented onto either a metal (Castwell M.C. 12) or composite resin (Build-It FR and FibreKor) abutment with resin cement (Panavia F2.0). Twenty-four specimens were fabricated for four groups (n=6 each) and subjected to 280-N cyclic impact loading at 1.0 Hz. The number of cycles which caused the composite crown to fracture was defined as its fracture resistance. All data were statistically analyzed using ANOVA and the Bonferroni test (α=0.05). Composite crowns cemented onto resin abutments showed higher fracture resistance than those cemented onto metal abutments.
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Affiliation(s)
- Kenji Sakoguchi
- Department of Fixed Prosthetic Dentistry, Advanced Therapeutic Course, Kagoshima University Graduate School of Medical and Dental Sciences, 8-35-1 Sakuragaoka, Kagoshima 890-8544, Japan
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Effect of the crown, post, and remaining coronal dentin on the biomechanical behavior of endodontically treated maxillary central incisors. J Prosthet Dent 2014; 111:234-46. [DOI: 10.1016/j.prosdent.2013.07.006] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Influence of Ferrule, Post System, and Length on Biomechanical Behavior of Endodontically Treated Anterior Teeth. J Endod 2014; 40:119-23. [DOI: 10.1016/j.joen.2013.09.034] [Citation(s) in RCA: 65] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2013] [Revised: 08/28/2013] [Accepted: 09/14/2013] [Indexed: 11/18/2022]
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Sterzenbach G, Franke A, Naumann M. Rigid versus flexible dentine-like endodontic posts--clinical testing of a biomechanical concept: seven-year results of a randomized controlled clinical pilot trial on endodontically treated abutment teeth with severe hard tissue loss. J Endod 2013; 38:1557-63. [PMID: 23146637 DOI: 10.1016/j.joen.2012.08.015] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2012] [Revised: 08/21/2012] [Accepted: 08/21/2012] [Indexed: 11/28/2022]
Abstract
INTRODUCTION This is the first clinical long-term pilot study that tested the biomimetic concept of using more flexible, dentine-like (low Young modulus) glass fiber-reinforced epoxy resin posts (GFREPs) compared with rather rigid, stiff (higher Young modulus) titanium posts (TPs) in order to improve the survival rate of severely damaged endodontically treated teeth. METHODS Ninety-one subjects in need of postendodontic restorations in teeth with 2 or less remaining cavity walls were randomly assigned to receive either a tapered TP (n = 46) or a tapered GFREP (n = 45). The posts were adhesively luted using self-adhesive resin cement. The composite core build-ups were prepared ensuring a circumferential 2-mm ferrule. The primary endpoint was a loss of restoration for any reason. To study group differences, the log-rank test was calculated (P < .05). Hazard plots were constructed. RESULTS After 84 months of observation (mean = 71.2 months), 7 restorations failed (ie, 4 GFREPs and 3 TPs). The failure modes were as follows: GFREP:root fracture (n = 3), core fracture (n = 1) and TP:endodontic failure (n = 3). No statistical difference was found between the survival rates (GFREPs = 90.2%, TPs = 93.5%, P = .642). The probability of no failure was comparable for both post materials (risk ratio; 95% confidence interval, 0.965-0.851/1.095). CONCLUSIONS When using self-adhesive luted prefabricated posts in severely destroyed abutment teeth with 2 or less cavity walls and a 2-mm ferrule, postendodontic restorations achieved high long-term survival rates irrespective of the post material used (ie, glass fiber vs titanium).
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Affiliation(s)
- Guido Sterzenbach
- Department of Prosthodontics, Geriatric Dentistry and Craniomandibular Disorders, Charité-Universitätsmedizin Berlin, Berlin, Germany.
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Santos Filho PCF, Soares PV, Reis BR, Verissimo C, Soares CJ. Effects of threaded post placement on strain and stress distribution of endodontically treated teeth. Braz Oral Res 2013; 27:305-10. [DOI: 10.1590/s1806-83242013000400003] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2013] [Accepted: 04/05/2013] [Indexed: 11/22/2022] Open
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A flood tide of systematic reviews on endodontic posts: methodological assessment using of R-AMSTAR. Clin Oral Investig 2013; 17:1287-94. [DOI: 10.1007/s00784-013-0945-z] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2012] [Accepted: 02/05/2013] [Indexed: 01/08/2023]
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Petrie CS, Walker MP. Effect of airborne-particle abrasion and aqueous storage on flexural properties of fiber-reinforced dowels. J Prosthodont 2012; 21:296-303. [PMID: 22394023 DOI: 10.1111/j.1532-849x.2011.00836.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022] Open
Abstract
PURPOSE A great range of clinical failures have been observed with fiber-reinforced dowels, often attributed to fracture or bending of the dowels. This study investigated flexural properties of fiber-reinforced dowels, with and without airborne-particle abrasion, after storage in aqueous environments over time. Scanning electron microscopy (SEM) was used to analyze the mode of failure of dowels. MATERIALS AND METHODS Two dowel systems (ParaPost Fiber Lux and FibreKor) were evaluated. Ten dowels of each system were randomly assigned to one of six experimental groups: 1--control, dry condition; 2--dowels airborne-particle abraded and then stored dry; 3--dowels stored for 24 hours in aqueous solution at 37°C; 4--dowels airborne-particle abraded followed by 24-hour aqueous storage at 37°C; 5--dowels stored for 30 days in aqueous solution at 37°C; 6--dowels airborne-particle abraded followed by 30-day aqueous storage at 37°C. Flexural strength and flexural modulus were tested for all groups according to American Society of Testing and Materials (ASTM) standard D4476. One failed dowel from each group was randomly selected to be evaluated with SEM equipped with energy dispersive spectroscopy (EDS) to characterize the failure pattern. One intact dowel of each system was also analyzed with SEM and EDS for baseline information. RESULTS Mean flexural modulus and strength of ParaPost Fiber Lux dowels across all conditions were 29.59 ± 2.89 GPa and 789.11 ± 89.88 MPa, respectively. Mean flexural modulus and strength of FibreKor dowels across all conditions were 25.58 ± 1.48 GPa and 742.68 ± 89.81 MPa, respectively. One-way ANOVA and a post hoc Dunnett's t-test showed a statistically significant decrease in flexural strength as compared to the dry control group for all experimental groups stored in water, for both dowel systems (p < 0.05). Flexural modulus for both dowel systems showed a statistically significant decrease only for dowels stored in aqueous solutions for 30 days (p < 0.05). Airborne-particle abrasion did not have an effect on flexural properties for either dowel system (p > 0.05). SEM and EDS analyses revealed differences in composition and failure mode of the two dowel systems. Failed dowels of each system revealed similar failure patterns, irrespective of the experimental group. CONCLUSIONS Aqueous storage had a negative effect on flexural properties of fiber-reinforced dowels, and this negative effect appeared to increase with longer storage times. The fiber/resin matrix interface was the weak structure for the dowel systems tested.
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Affiliation(s)
- Cynthia S Petrie
- Department of Restorative Dentistry, UMKC School of Dentistry, Kansas City, MO 64108, USA.
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