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Uzun İ, Timur AH, Şenel K. In-vitro comparison of fracture resistance of CAD/CAM porcelain restorations for endodontically treated molars. BMC Oral Health 2024; 24:1187. [PMID: 39369196 DOI: 10.1186/s12903-024-04983-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2024] [Accepted: 09/30/2024] [Indexed: 10/07/2024] Open
Abstract
BACKGROUND This study evaluates the fracture strength and patterns of feldspathic porcelain restorations made using CAD/CAM technology for lower first molars with extensive crown destruction. The restorations include post-core and full-contour crown, composite resin core and full-contour crown, and endocrown. This research provides insights into effective restorative options to address tooth fracture risk, supporting minimally invasive procedures and CAD/CAM integration in dental practices. METHODS This study utilized 80 permanent mandibular first molars, which were divided into four groups: Group I (Post-Core-Full-contour crown), Group II (Core- Full-contour crown), Group III (Endocrown), and Group IV (Control). Root canal treatment was performed on all samples except for the control group. Following access cavity preparation, restorations for each tooth were fabricated using the CAD/CAM system and cemented with resin cement. The specimens were embedded in acrylic blocks. After undergoing thermomechanical aging, the samples were subjected to fracture resistance testing using a universal testing machine, which applied force until fracture occurred. The fracture patterns were subsequently analyzed, and the data were statistically evaluated using the Kruskal-Wallis and Chi-Square tests (p < 0.05). RESULTS A significant difference in fracture values under axial forces was observed (p < 0.05). The control group had the highest fracture strength (1830 ± 277 N), while the Core- full-contour crown group showed the lowest (1532 ± 371 N). Failure types varied significantly among the groups (χ2 = 26.886, df = 9, p = 0.001). The most common failure type was Type-2 (33.75%), characterized by restorable fractures, while Type-3 fractures, unrestorable, were the least common (12.5%). CONCLUSIONS The findings underscore the significance of technological advancements in CAD/CAM for effectively restoring endodontically treated teeth with extensive crown damage. This study contributes valuable insights, emphasizing the clinical relevance of selecting appropriate restorative options to mitigate the risk of tooth fracture associated with coronal restoration failures.
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Affiliation(s)
- İsmail Uzun
- Faculty of Dentistry, Department of Endodontics, Ondokuz Mayıs University, Samsun, Turkey.
| | | | - Kevser Şenel
- Endodontist, Ordu Central Dental Hospital, Ordu, Turkey
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Jrab B, Rahman Saleh A, Al-Jadaa A, Jurado CA, Saeed MH, Afrashtehfar KI. Fracture resistance of CAD/CAM tooth-colored versus cast metal post-and-core restorations in root filled teeth: An in vitro study. Saudi Dent J 2024; 36:1215-1220. [PMID: 39286579 PMCID: PMC11402007 DOI: 10.1016/j.sdentj.2024.07.002] [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] [Received: 03/30/2024] [Revised: 06/17/2024] [Accepted: 07/01/2024] [Indexed: 09/19/2024] Open
Abstract
Purpose This study investigated the fracture resistance and failure modes of custom-fabricated post- and core dental restorations using various CAD/CAM materials. Materials and Methods Seventy-five mandibular second premolars were allocated to five groups (n = 15) and prepared for standardized post and core restorations. The groups included a control group comprising cast metal and four CAD/CAM materials: Vita Enamic, Shofu HC, Trilor, and PEKK. Fracture resistance was assessed using a compressive force at a crosshead speed of 1 mm/min until failure occurred. Data were analyzed using one-way analysis of variance (ANOVA) and chi-square tests. Results The metal group had the highest fracture resistance (244.41 ± 75.20 N), with a significant variance compared to that in the CAD/CAM groups (p < 0.001). No significant differences were observed among the non-metallic groups. Conclusions While several CAD/CAM materials displayed satisfactory flexural properties, cast metal posts showed superior fracture resistance in endodontically treated teeth but were mostly associated with catastrophic failure. The clinical application of CAD/CAM materials for post-core restorations presents a viable alternative to traditional metal posts, potentially reducing the risk of unfavorable fractures.
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Affiliation(s)
- Buthaina Jrab
- Clinical Sciences Department, College of Dentistry, Ajman University, Ajman City P.O. Box 346, United Arab Emirates
| | - Abdul Rahman Saleh
- Clinical Sciences Department, College of Dentistry, Ajman University, Ajman City P.O. Box 346, United Arab Emirates
- Center of Medical and Bio-Allied Health Sciences Research, Ajman University, Ajman City P.O. Box 346, United Arab Emirates
| | - Anas Al-Jadaa
- Clinical Sciences Department, College of Dentistry, Ajman University, Ajman City P.O. Box 346, United Arab Emirates
- Center of Medical and Bio-Allied Health Sciences Research, Ajman University, Ajman City P.O. Box 346, United Arab Emirates
| | - Carlos A Jurado
- Division of Operative Dentistry, Department of General, College of Dentistry, University of Tennessee Health Science Center, Memphis, TN 38103, USA
| | - Musab H Saeed
- Clinical Sciences Department, College of Dentistry, Ajman University, Ajman City P.O. Box 346, United Arab Emirates
- Center of Medical and Bio-Allied Health Sciences Research, Ajman University, Ajman City P.O. Box 346, United Arab Emirates
| | - Kelvin I Afrashtehfar
- Clinical Sciences Department, College of Dentistry, Ajman University, Ajman City P.O. Box 346, United Arab Emirates
- Klinik für Rekonstruktive Zahnmedizin und Gerodontologie, ZMK Bern - Zahnmedizinische Kliniken der Universität Bern, 3010, Bern, Switzerland
- Consultant Private Practice Limited to Surgical Prosthodontics, Abu Dhabi City, AZU, United Arab Emirates
- Consultant Private Practice Limited to Surgical Prosthodontics, Dubai, DXB, United Arab Emirates
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Rauber BF, De Carli JP, Dallepiane FG, Dogenski LC, Goedel F, Cecchin D, Palhano HS, Corazza PH, Collares KF, Souza MA, Farina AP. Aspects of glass and hybridization protocols for bonding of fiber posts to root dentine. Eur J Oral Sci 2024; 132:e13002. [PMID: 38938069 DOI: 10.1111/eos.13002] [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: 01/12/2024] [Revised: 06/03/2024] [Accepted: 06/06/2024] [Indexed: 06/29/2024]
Abstract
This study evaluated bond strength of glass fiber posts to root dentin using push-out (PO) and diametral compression (DC), testing glycolic acid as a conditioner and varying dentin moisture. An additional aim was to test whether DC can be an alternative test to PO for bond strength assessment. Eighty bovine teeth were divided into eight groups (n = 10) defined by the use of either 37% glycolic acid or 37% phosphoric acid (PA) on moist or wet dentin before bonding with either Adapter SingleBond/RelyX ARC or One Step Plus/Duo-Link Bisco. Each tooth provided discs with an internal diameter of 2 mm, external diameter of 5 mm, and height of 2 mm, which underwent PO and DC. Finite element analysis (FEA) was carried out on 3D models. When analyzing PO results through linear regression, the highest values of bond strength were observed using glycolic acid on wet dentin in the cervical and middle thirds of the teeth. Analyzing DC results, the only statistical influence on values was the dental thirds. The scatterplot of the DC results and the PO bond strength values indicated no relationship between the results of the two tests (r = 0.03; p = 0.64). PO test detected more sensitive changes in bond strength values than DC.
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Affiliation(s)
| | | | | | | | - Fábio Goedel
- School of Engineering, University of Passo Fundo, Passo Fundo, RS, Brazil
| | - Doglas Cecchin
- School of Dentistry, University of Passo Fundo, Passo Fundo, RS, Brazil
| | | | | | | | | | - Ana Paula Farina
- School of Dentistry, University of Passo Fundo, Passo Fundo, RS, Brazil
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Abdulamir SW, Majeed MA. Fracture Resistance of Endodontically Treated Maxillary Premolar Teeth Restored with Wallpapering Technique: A Comparative In Vitro Study. Int J Dent 2023; 2023:6159338. [PMID: 37143851 PMCID: PMC10154104 DOI: 10.1155/2023/6159338] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2023] [Revised: 04/04/2023] [Accepted: 04/12/2023] [Indexed: 05/06/2023] Open
Abstract
Objectives This in vitro study aimed to evaluate and compare the fracture resistance and mode of failure of endodontically treated maxillary premolar teeth restored with different direct composite restorative techniques. Materials and Methods Forty freshly extracted maxillary premolar teeth with comparable sizes were used in this in vitro study. Each tooth received mesio-occluso-distal cavity preparation (3 mm width and 6 mm depth) followed by endodontic treatment. Canals were instrumented with RACE EVO rotary files (FKG, Dentaire, Switzerland) up to MAF 25/.06. Canals were obturated using a single cone technique, then the teeth were divided arbitrarily into five groups (n = 8): Group A: direct composite resin only using a centripetal technique, Group B: direct composite resin with glass fiber post, Group C: direct composite resin with short fiber-reinforced composite (everX Flow), Group D: direct composite resin with leno wave ultra high molecular weight polyethylene (LWUHMWPE) fibers placed on cavity floor, and Group E: direct composite resin with LWUHMWPE fibers placed circumferentially around the cavity walls (wallpapering technique). The teeth were then stored in distilled water at 37°C for 24 hr. The fracture resistance of each sample was measured using a universal testing machine in Newton (N). The data were analyzed using one-way analysis of variance (ANOVA) and the Bonferroni test with a significance level of 0.05. Results Group E recorded the maximum mean of fracture load (2,139.375 N), while Group A recorded the minimum mean of fracture load (689.6250 N). The one-way ANOVA test revealed a significant difference between the groups. The Bonferroni test showed a significant difference between each two groups, with the exception of those between Groups B and C and between Groups D and E, where there were no statistically significant differences (p > 0.05). Conclusion Restoration of endodontically treated teeth using the wallpapering technique recorded the highest mean of fracture resistance with a repairable mode of fracture.
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Affiliation(s)
- Shahed Wissam Abdulamir
- Aesthetic and Restorative Dentistry Department, Collage of Dentistry, University of Baghdad, Baghdad, Iraq
| | - Manhal A. Majeed
- Aesthetic and Restorative Dentistry Department, Collage of Dentistry, University of Baghdad, Baghdad, Iraq
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Maso PC, Souza MA, Borba M, Goedel F, Farina AP, Cecchin D, Maso DC, Dogenski LC, Corazza PH, Palhano HS, Rauber BF, De Carli JP. Influence of photodynamic therapy, different final irrigants, and ultrasonic activation on the bond strength of glass fiber posts to root dentin. Photodiagnosis Photodyn Ther 2022; 40:103180. [PMID: 36323366 DOI: 10.1016/j.pdpdt.2022.103180] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2022] [Revised: 10/15/2022] [Accepted: 10/27/2022] [Indexed: 11/06/2022]
Abstract
OBJECTIVE To evaluate the influence of photodynamic therapy (PDT), different final irrigants, and ultrasonic activation (US) on the bond strength of glass fiber posts (GFP) to root dentin. METHODS One hundred twenty bovine roots were divided into 12 groups according to PDT application, the type of final endodontic irrigant, and US. The samples were divided into 12 groups (n = 10): G1-DW(distilled water); G2-DW+US; G3-17% EDTA; G4-17% EDTA+US; G5-17% GA (glycolic acid); G6-17% GA+US; G7-PDT+DW; G8-PDT+DW+US; G9-PDT+17% EDTA; G10-PDT+17% EDTA+US; G11-PDT+17% GA; G12-PDT+17% GA+US. After cementing the glass fiber posts with resin cement, roots were sectioned into 2-mm-thick slices. One slice from the cervical third and another from the middle third were used for the push out test (PO), and the other two for the diametral compression test (DC). Thus, 10 samples were obtained per third for each mechanical test (n = 10). Kruskal-Wallis and Student-Newman-Keuls tests were used to analyze PO and DC data, and Pearson's correlation test was used to verify the relationship between the variables. Failure patterns were analyzed with chi-square test. RESULTS Significant differences were found in the PO test among the experimental groups (p < 0.001; power=1.00). PDT improved bond strength when using EDTA. PDT and US increased bond strength when using GA. Favorable failure patterns occurred more frequently in Group GA+US. There was no correlation between data obtained with PO and DC tests (r = 0.112; p = 0.729). CONCLUSION PDT provided the highest bond strength values of GFP to root dentin when associated with GA and US or when associated only with EDTA.
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Affiliation(s)
| | | | - Márcia Borba
- School of Dentistry, University of Passo Fundo, Passo Fundo, RS, Brazil
| | - Fábio Goedel
- School of Engineering, University of Passo Fundo, Passo Fundo, RS, Brazil
| | - Ana Paula Farina
- School of Dentistry, University of Passo Fundo, Passo Fundo, RS, Brazil
| | - Doglas Cecchin
- School of Dentistry, University of Passo Fundo, Passo Fundo, RS, Brazil
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Ferrari M, Pontoriero DIK, Ferrari Cagidiaco E, Carboncini F. Restorative difficulty evaluation system of endodontically treated teeth. J ESTHET RESTOR DENT 2022; 34:65-80. [PMID: 35133074 DOI: 10.1111/jerd.12880] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2021] [Revised: 01/11/2022] [Accepted: 01/17/2022] [Indexed: 01/22/2023]
Abstract
OBJECTIVE This article provides an updated overview of restorative procedures of endodontically treated teeth. CLINICAL CONSIDERATIONS The different techniques and procedures to restore an endodontic treated tooth were considered in the last decades. While they are generally performed using bonding procedures in combination with or without the placement of a post into the root to build up the abutment, there has been a lack of interest in restorative difficulties that can be faced. Failures are represented such as debonding of the post, fracture of the root, decementation, and/or fracture of the restoration, microleakage of the margins. Essentially, the presence of a sufficient failure is considered a key point of a long prognosis. Different clinical factors can directly influence the type of restoration and the longevity of the treatment. The restorative difficulty evaluation system (RDES) is proposed in this article. This new system is composed of eight different clinical factors that are divided into six levels of difficulties. The RDES is composed of 1. Endodontic complexity and outcome, 2. Vertical amount of coronal residual structure and dimension of the pulp chamber, 3. Horizontal amount of coronal residual structure, 4. Restoration marginal seal, 5. Local interdisciplinary conditions, 6. the complexity of the treatment planning, 7. Functional need, 8. Dental wear and esthetic need. CONCLUSION This article reviews the RDES and outlines critical steps and tips for clinical success. CLINICAL SIGNIFICANCE The RDES allows to any clinician to evaluate restorative difficulties when an endodontic treated tooth must be restored, combines clinical aspects that can involve from the single tooth to a full mouth rehabilitation.
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Affiliation(s)
- Marco Ferrari
- Department of Prosthodontics and Dental Materials, School of Dentistry, University of Siena, Siena, Italy
| | - Denise I K Pontoriero
- Department of Prosthodontics and Dental Materials, School of Dentistry, University of Siena, Siena, Italy
| | | | - Fabio Carboncini
- Department of Prosthodontics and Dental Materials, School of Dentistry, University of Siena, Siena, Italy
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Özarslan M, Büyükkaplan UŞ, Özarslan MM. Comparison of the fracture strength of endodontically treated teeth restored with polyether ether ketone, zirconia and glass-fibre post-core systems. Int J Clin Pract 2021; 75:e14440. [PMID: 34096673 DOI: 10.1111/ijcp.14440] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/25/2021] [Accepted: 05/25/2021] [Indexed: 11/28/2022] Open
Abstract
PURPOSE This study aimed to compare the fracture resistance and fracture mode of maxillary central incisors restored with four different sizes and three different post-core systems. MATERIALS AND METHODS One hundred and twenty maxillary incisors were endodontically treated and randomly divided into three groups (12 subgroups). Post cavities for the narrow subgroups were prepared with 1.4-mm-diameter drills in lengths of 7.5 mm (SN) and 10 mm (LN). Post cavities for the wide subgroups were prepared with 1.6-mm-diameter drills in lengths of 7.5 mm (SW) and 10 mm (LW) (n = 10). Group F was restored with glass-fibre post and composite resin core, Group P was restored with custom PEEK post-core and Group Z was restored with custom zirconia post-core. All posts were cemented with a dual-cure resin cement. Zirconia copings were cemented. Specimens were loaded on the palatal surface with a universal testing machine, and the fracture strengths of the teeth were statistically analysed using ANOVA and post hoc Tukey tests. RESULTS Statistically significant differences existed between the fracture strengths of the post materials. The highest fracture strength was in Group F, and the lowest was in Group P. Evaluation of the fracture strengths of the post lengths and diameters demonstrated that the short-narrow group of Group Z had the lowest fracture strength (P < .05). The long-wide group of Group F showed the highest fracture resistance. In Group P, no statistically significant difference existed between the post-cores of different dimensions (P > .05). Irreparable fractures were observed mostly in Group Z, and decementation was more common in Group P. CONCLUSIONS PEEK post-cores showed sufficient fracture strength for the anterior region, similar to the other two post-core materials. PEEK post-cores showed more decementation and repairable fractures at lower forces, while restoration failure was mostly catastrophic for glass-fibre and zirconia posts.
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Affiliation(s)
- Merve Özarslan
- Department of Prosthetic Dentistry, Faculty of Dentistry, Akdeniz University, Antalya, Turkey
| | | | - Mehmet Mustafa Özarslan
- Department of Prosthetic Dentistry, Faculty of Dentistry, Akdeniz University, Antalya, Turkey
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Rathee G, Bartwal G, Rathee J, Mishra YK, Kaushik A, Solanki PR. Emerging Multimodel Zirconia Nanosystems for High‐Performance Biomedical Applications. ADVANCED NANOBIOMED RESEARCH 2021. [DOI: 10.1002/anbr.202100039] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Affiliation(s)
- Garima Rathee
- Special Centre for Nano science Jawaharlal Nehru University New Delhi India
| | - Gaurav Bartwal
- Hemwati Nandan Bahuguna Garhwal University Birla Campus, Pauri Garhwal Srinagar Uttarakhand 246174 India
| | - Jyotsna Rathee
- CSE Department Deenbandhu Chhoturam University of Science and Technology Murthal Haryana 131039 India
| | - Yogendra Kumar Mishra
- Mads Clausen Institute NanoSYD University of Southern Denmark Alison 2 6400 Sønderborg Denmark
| | - Ajeet Kaushik
- NanoBioTech Laboratory Department of Natural Sciences, Division of Sciences, Art, and Mathematics Florida Polytechnic University Lakeland FL 33805 USA
| | - Pratima R. Solanki
- Special Centre for Nano science Jawaharlal Nehru University New Delhi India
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Spicciarelli V, Marruganti C, Di Matteo C, Martignoni M, Ounsi H, Doldo T, Ferrari M, Grandini S. Influence of single post, oval, and multi-post restorative techniques and amount of residual tooth substance on fracture strength of endodontically treated maxillary premolars. J Oral Sci 2020; 63:70-74. [PMID: 33239485 DOI: 10.2334/josnusd.20-0338] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
Abstract
PURPOSE The aim of this study was to compare the influence of the number of coronal walls and post-endodontic restorations on the mechanical strength of 165 recently extracted endodontically treated maxillary premolars. METHODS The teeth were divided into 3 control (no post) and 3 test groups according to the number of residual walls. Each test group was divided into subgroups according to the type of post-endodontic restoration (single, oval, and multi-post techniques). Samples were prepared conforming to the assigned subgroup. A universal loading machine applied a load parallel to the longitudinal axis of the teeth, thus simulating physiological occlusion. ANOVA and the Kruskal Wallis test were used for comparisons (P ≤ 0.05), and Tukey's test for multiple comparisons. RESULTS For intact teeth, significant differences were found among all 3 subgroups, with single post showing the highest values. For 3 residual walls, oval post resulted in significantly lower values than single and multi-post systems. For 2 residual walls, the multi-post technique showed almost twice the resistance of oval post restorations. CONCLUSION In oval canals the use of a single or multi-post technique increased post-and-core resistance even in intact teeth, whereas oval fiber posts showed no improvements. Multi-post design improved fracture resistance mostly in maxillary premolars lacking both marginal ridges.
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Affiliation(s)
- Valentina Spicciarelli
- Department of Medical Biotechnologies, Unit of Endodontics and Restorative Dentistry, University of Siena
| | - Crystal Marruganti
- Department of Medical Biotechnologies, Unit of Endodontics and Restorative Dentistry, University of Siena
| | - Carla Di Matteo
- Department of Medical Biotechnologies, Unit of Endodontics and Restorative Dentistry, University of Siena
| | - Marco Martignoni
- Department of Medical Biotechnologies, Unit of Endodontics and Restorative Dentistry, University of Siena
| | - Hani Ounsi
- Department of Medical Biotechnologies, Unit of Endodontics and Restorative Dentistry, University of Siena
| | - Tiziana Doldo
- Department of Medical Biotechnologies, Unit of Orthodontics, University of Siena
| | - Marco Ferrari
- Department of Medical Biotechnologies, Unit of Prosthodontics, University of Siena
| | - Simone Grandini
- Department of Medical Biotechnologies, Unit of Endodontics and Restorative Dentistry, University of Siena
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Güven MÇ, Dayan SÇ, Yıldırım G, Mumcu E. Custom and prefabricated PolyEtherKetoneKetone (PEKK) post-core systems bond strength: Scanning electron microscopy evaluation. Microsc Res Tech 2020; 83:804-810. [PMID: 32167226 DOI: 10.1002/jemt.23471] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2019] [Revised: 01/23/2020] [Accepted: 02/22/2020] [Indexed: 11/11/2022]
Abstract
The present study evaluated the bond strengths of prefabricated PolyEtherKetoneKetone (PEKK) posts, PEKK posts custom-configured according to root-canal size, and conventional fiber posts. A total of 30 maxillary incisors were randomly divided into three groups, as follows: Group 1: fiber posts; Group 2: prefabricated PEKK posts; Group 3; custom-made PEKK posts. Following endodontic treatment, post spaces were prepared, and posts were cemented with resin cement. Push-out bond strength testing was performed using a universal testing machine, and fractures modes were examined under a scanning electron microscope. Data were analyzed using One-way ANOVA and Tukey's HSD tests, with the level of significance set at .05. The highest bond-strength values in the cervical section were observed with the custom-made PEKK post (17.3470 MPa), whereas the highest bond-strength values in the middle and apical sections were observed with the conventional fiber posts (11.5375 MPa and 6.8625 MPa, respectively). Bond-strength values for all posts systems decreased in a cervical to apical direction. PEKK posts are a suitable alternative to fiber posts. Although custom-made PEKK posts demonstrated better bond strength than prefabricated PEKK posts, further studies are needed to evaluate their clinical performance.
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Affiliation(s)
- Melahat Çelik Güven
- Department of Prosthodontics, Faculty of Dentistry, Istanbul Yeni Yüzyıl University, Istanbul, Turkey
| | | | - Gülhan Yıldırım
- Department of Prosthodontics, Faculty of Dentistry, Istanbul Yeni Yüzyıl University, Istanbul, Turkey
| | - Emre Mumcu
- Department of Prosthodontics. Faculty of Dentistry, Eskisehir Osmangazi University, Odunpazarı, Turkey
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Longevity of composite build-ups without posts-10-year results of a practice-based study. Clin Oral Investig 2018; 23:1435-1442. [PMID: 30046906 DOI: 10.1007/s00784-018-2565-0] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2018] [Accepted: 07/09/2018] [Indexed: 10/28/2022]
Abstract
AIM The aim of this prospective, non-interventional, multi-center, practice-based study was, firstly, to evaluate the longevity of composite build-ups in endodontically treated teeth (ETT) without post placement and, secondly, to analyze factors influencing the success of these composite build-ups. METHODOLOGY Each of seven general dental practitioners placed up to 50 composite build-ups without additional posts in ETT. Teeth were restricted to incisors, canines, and premolars. Several clinical data were recorded for 192 coronal restorations on ETT in 192 patients. Cox proportional hazard models were applied to analyze associations between clinical factors and time until failure. RESULTS Within a follow-up period of 10 years, 167 restorations were judged as successful [mean success time, 110 (105-115) months] and 180 teeth survived [mean survival time, 114 (110-119) months]. The main failure type was fracture of the restoration (n = 15). The annual failure rate was 2.4%. In bivariate Cox regression, both factors such as number of restored tooth surfaces and adhesive were significantly associated with the failure rate. In multivariate Cox proportional hazards regression, none of the investigated factors were significantly associated with the failure rate. CONCLUSION For composite build-ups in ETT without post placement, high success rates could be found after up to 10 years of observation time. Within the limitations of the present study, none of the analyzed factors such as "tooth type" or "number of restored tooth surfaces" was a significant predictor for the failure rate. CLINICAL RELEVANCE Endodontically treated teeth can be successfully directly restored with composite build-ups even when no additional post is inserted. TRIAL REGISTRATION The study was registered in the German Clinical Trials Register (DRKS-ID: DRKS00012882).
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Riccitiello F, Amato M, Leone R, Spagnuolo G, Sorrentino R. In vitro Evaluation of the Marginal Fit and Internal Adaptation of Zirconia and Lithium Disilicate Single Crowns: Micro-CT Comparison Between Different Manufacturing Procedures. Open Dent J 2018; 12:160-172. [PMID: 29854014 PMCID: PMC5952349 DOI: 10.2174/1874210601812010160] [Citation(s) in RCA: 52] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2017] [Revised: 01/02/2018] [Accepted: 01/29/2018] [Indexed: 11/24/2022] Open
Abstract
Background: Prosthetic precision can be affected by several variables, such as restorative materials, manufacturing procedures, framework design, cementation techniques and aging. Marginal adaptation is critical for long-term longevity and clinical success of dental restorations. Marginal misfit may lead to cement exposure to oral fluids, resulting in microleakage and cement dissolution. As a consequence, marginal discrepancies enhance percolation of bacteria, food and oral debris, potentially causing secondary caries, endodontic inflammation and periodontal disease. Objective: The aim of the present in vitro study was to evaluate the marginal and internal adaptation of zirconia and lithium disilicate single crowns, produced with different manufacturing procedures. Methods: Forty-five intact human maxillary premolars were prepared for single crowns by means of standardized preparations. All-ceramic crowns were fabricated with either CAD-CAM or heat-pressing procedures (CAD-CAM zirconia, CAD-CAM lithium disilicate, heat-pressed lithium disilicate) and cemented onto the teeth with a universal resin cement. Non-destructive micro-CT scanning was used to achieve the marginal and internal gaps in the coronal and sagittal planes; then, precision of fit measurements were calculated in a dedicated software and the results were statistically analyzed. Results: The heat-pressed lithium disilicate crowns were significantly less accurate at the prosthetic margins (p<0.05) while they performed better at the occlusal surface (p<0.05). No significant differences were noticed between CAD-CAM zirconia and lithium disilicate crowns (p>0.05); nevertheless CAD-CAM zirconia copings presented the best marginal fit among the experimental groups. As to the thickness of the cement layer, reduced amounts of luting agent were noticed at the finishing line, whereas a thicker layer was reported at the occlusal level. Conclusion: Within the limitations of the present in vitro investigation, the following conclusions can be drawn: the recorded marginal gaps were within the clinical acceptability irrespective of both the restorative material and the manufacturing procedures; the CAD-CAM processing techniques for both zirconia and lithium disilicate produced more consistent marginal gaps than the heat-pressing procedures; the tested universal resin cement can be safely used with both restorative materials.
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Affiliation(s)
- Francesco Riccitiello
- Department of Neurosciences, Reproductive and Odontostomatological Sciences, University "Federico II" of Naples, Naples, Italy
| | - Massimo Amato
- Department of Medicine, Surgery and Dentistry, University of Salerno, Salerno, Italy
| | - Renato Leone
- Department of Neurosciences, Reproductive and Odontostomatological Sciences, University "Federico II" of Naples, Naples, Italy
| | - Gianrico Spagnuolo
- Department of Neurosciences, Reproductive and Odontostomatological Sciences, University "Federico II" of Naples, Naples, Italy
| | - Roberto Sorrentino
- Department of Neurosciences, Reproductive and Odontostomatological Sciences, University "Federico II" of Naples, Naples, Italy
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Kim AR, Lim HP, Yang HS, Park SW. Effect of ferrule on the fracture resistance of mandibular premolars with prefabricated posts and cores. J Adv Prosthodont 2017; 9:328-334. [PMID: 29142639 PMCID: PMC5673608 DOI: 10.4047/jap.2017.9.5.328] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2016] [Revised: 06/22/2017] [Accepted: 08/29/2017] [Indexed: 11/08/2022] Open
Abstract
PURPOSE This study evaluated fracture resistance with regard to ferrule lengths and post reinforcement on endodontically treated mandibular premolars incorporating a prefabricated post and resin core. MATERIALS AND METHODS One hundred extracted mandibular premolars were randomly divided into 5 groups (n=20): intact teeth (NR); endodontically treated teeth (ETT) without post (NP); ETT restored with a prefabricated post with ferrule lengths of either 0 mm (F0), 1 mm (F1), or 2 mm (F2). Prepared teeth were restored with metal crowns. A thermal cycling test was performed for 1,000 cycles. Loading was applied at an angle of 135 degrees to the axis of the tooth using a universal testing machine with a crosshead speed of 2.54 mm/min. Fracture loads were analyzed by one-way ANOVA and Tukey HSD test using a statistical program (α=.05). RESULTS There were statistical differences in fracture loads among groups (P<.001). The fracture load of F2 (237.7 ± 83.4) was significantly higher than those of NP (155.6 ± 74.3 N), F0 (98.8 ± 43.3 N), and F1 (152.8 ± 78.5 N) (P=.011, P<.001, and P=.008, respectively). CONCLUSION Fracture resistance of ETT depends on the length of the ferrule, as shown by the significantly increased fracture resistance in the 2 mm ferrule group (F2) compared to the groups with shorter ferrule lengths (F0, F1) and without post (NP).
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Affiliation(s)
- Ae-Ra Kim
- Department of Prosthodontics, School of Dentistry, Chonnam National University, Gwangju, Republic of Korea
| | - Hyun-Pil Lim
- Department of Prosthodontics, School of Dentistry, Chonnam National University, Gwangju, Republic of Korea
| | - Hong-So Yang
- Department of Prosthodontics, School of Dentistry, Chonnam National University, Gwangju, Republic of Korea
| | - Sang-Won Park
- Department of Prosthodontics, School of Dentistry, Chonnam National University, Gwangju, Republic of Korea
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Modeling of damage driven fracture failure of fiber post-restored teeth. J Mech Behav Biomed Mater 2015; 49:277-89. [PMID: 26056997 DOI: 10.1016/j.jmbbm.2015.05.006] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2015] [Revised: 04/25/2015] [Accepted: 05/07/2015] [Indexed: 11/23/2022]
Abstract
Mechanical failure of biomaterials, which can be initiated by either violent force, or progressive stress fatigue, is a serious issue. Great efforts have been made to improve the mechanical performances of dental restorations. Virtual simulation is a promising approach for biomechanical investigations, which presents significant advantages in improving efficiency than traditional in vivo/in vitro studies. Over the past few decades, a number of virtual studies have been conducted to investigate the biomechanical issues concerning dental biomaterials, but only with limited incorporation of brittle failure phenomena. Motivated by the contradictory findings between several finite element analyses and common clinical observations on the fracture resistance of post-restored teeth, this study aimed to provide an approach using numerical simulations for investigating the fracture failure process through a non-linear fracture mechanics model. The ability of this approach to predict fracture initiation and propagation in a complex biomechanical status based on the intrinsic material properties was investigated. Results of the virtual simulations matched the findings of experimental tests, in terms of the ultimate fracture failure strengths and predictive areas under risk of clinical failure. This study revealed that the failure of dental post-restored restorations is a typical damage-driven continuum-to-discrete process. This approach is anticipated to have ramifications not only for modeling fracture events, but also for the design and optimization of the mechanical properties of biomaterials for specific clinically determined requirements.
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SARIDAG S, SARI T, OZYESIL AG, ARI AYDINBELGE H. Fracture resistance of endodontically treated teeth restored with ceramic inlays and different base materials. Dent Mater J 2015; 34:175-80. [DOI: 10.4012/dmj.2014-069] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Affiliation(s)
- Serkan SARIDAG
- Department of Prosthodontics, Faculty of Dentistry, Kocaeli University
| | - Tugrul SARI
- Department of Prosthodontics, Faculty of Dentistry, Bezmialem Vakıf University
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Aggarwal V, Singla M, Yadav S, Yadav H, Sharma V, Bhasin SS. The effect of ferrule presence and type of dowel on fracture resistance of endodontically treated teeth restored with metal-ceramic crowns. J Conserv Dent 2014; 17:183-7. [PMID: 24778519 PMCID: PMC4001279 DOI: 10.4103/0972-0707.128053] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2013] [Revised: 12/23/2013] [Accepted: 12/28/2013] [Indexed: 11/04/2022] Open
Abstract
AIM The purpose of the present study was to comparatively evaluate the effect of presence of a 2 mm ferrule and different type of dowels on fracture resistance of mandibular premolars. MATERIALS AND METHODS Fifty uniradicular mandibular premolars were divided into five groups (n = 10). Ten teeth received no treatment (group I). Samples in group II & III were decoronated 2 mm above cemento-enamel junction and received custom cast dowel-core and fiber dowel-composite core respectively, with 2 mm ferrule. Samples in group IV & V were decoronated at CEJ and were restored using cast dowels and fiber dowel-composite cores, without any ferrule. The restored teeth received metal ceramic crowns and were mechanically loaded. The specimens were subjected to a static load, until fracture, to determine the fracture resistance and fracture mode. RESULTS The samples with 2 mm ferrule had a higher fracture resistance than non ferrule groups. Within non ferrule groups, there were no significant differences in the fracture resistance. Specimen restored with cast dowel had more incidence of non-repairable fracture. CONCLUSIONS Presence of ferrule increased the fracture resistance of endodontically treated teeth. In case of absence of ferrule, fiber dowels had similar fracture resistance as that of cast dowels and showed increased incidence of repairable fracture.
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Affiliation(s)
- Vivek Aggarwal
- Department of Conservative Dentistry & Endodontics, Faculty of Dentistry, Jamia Millia Islamia, New Delhi, India
| | - Mamta Singla
- Department of Conservative Dentistry & Endodontics, SGT Dental College, Gurgaon, India
| | - Suman Yadav
- Department of Conservative Dentistry & Endodontics, SGT Dental College, Gurgaon, India
| | - Harish Yadav
- Department of Prosthodontics, SGT Dental College, Gurgaon, India
| | - Vikram Sharma
- Department of Conservative Dentistry & Endodontics, SGT Dental College, Gurgaon, India
| | - Saranjit Singh Bhasin
- Department of Prosthodontics, Faculty of Dentistry, Jamia Millia Islamia, New Delhi, India
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Yu W, Guo K, Zhang B, Weng W. Fracture resistance of endodontically treated premolars restored with lithium disilicate CAD/CAM crowns or onlays and luted with two luting agents. Dent Mater J 2014; 33:349-54. [PMID: 24739817 DOI: 10.4012/dmj.2013-240] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The purpose of the present study is to evaluate the fracture resistance of endodontically treated maxillary premolars restored using CAD/CAM onlays or crowns and luted with two types of resin cement. Forty all-ceramic crowns and twenty onlays were fabricated on maxillary premolars using the Cerec 3 system (n=10). The abutments were randomly subjected to two different procedures: Endodontic treatment was performed on forty teeth restored through a mesio-occlusal-distal (MOD) cavity preparation with composite resin fillings; twenty teeth without endodontic treatment served as control. In endodontically treated teeth restored using IPS e.max CAD crowns or onlays, the fracture loads were lower than those of the control. Endodontic treatment of teeth restored using CAD/CAM crowns does not impair the fracture load but shows more severe fractures than teeth restored using CAD/CAM onlays. This suggests that a CAD/CAM onlay might be an effective method for the restoration of endodontically treated premolars with MOD cavity defect.
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Affiliation(s)
- Weiqiang Yu
- Department of Prosthodontics, School of Stomatology and Affiliated Ninth People's Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai Research Institute of Stomatology
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Jiangkongkho P, Kamonkhantikul K, Takahashi H, Arksornnukit M. Fracture resistance of endodontically treated teeth using fiber post with an elastic modulus similar to dentin. Dent Mater J 2013; 32:781-6. [PMID: 24088834 DOI: 10.4012/dmj.2013-052] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
This study investigated the effect of fiber reinforced composite resin (FRC) post lengths, ferrule, and full coverage metal crown on fracture resistance of endodontically treated teeth (ETT) using an experimental FRC post with the similar elastic modulus of dentin (11.5 GPa). ETT was restored according to 1 of 7 combinations of FRC post length (10, 5, 2.5, 0 mm), ferrule (0, 2 mm), and with/without metal crown (n=6). An oblique compressive load was applied on the restored teeth using a universal testing machine. Fracture loads were evaluated with 1-way ANOVA and Tukey HSD test (p<0.05). Compared with tooth preparation only, the fracture loads of ETT restored with composite resin and different post lengths were not significantly different. The group with the ferrule with metal crown showed significantly greater fracture resistance than the others.
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Chang JWW, Soo I, Cheung GS. Evaluation of fiber post-supported restorations under simulated occlusal loading. J Prosthet Dent 2012; 108:158-64. [DOI: 10.1016/s0022-3913(12)60140-1] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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20
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Scotti N, Coero Borga FA, Alovisi M, Rota R, Pasqualini D, Berutti E. Is fracture resistance of endodontically treated mandibular molars restored with indirect onlay composite restorations influenced by fibre post insertion? J Dent 2012; 40:814-20. [PMID: 22743344 DOI: 10.1016/j.jdent.2012.06.005] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2012] [Revised: 04/26/2012] [Accepted: 06/15/2012] [Indexed: 11/15/2022] Open
Abstract
OBJECTIVES The aim of this study was to investigate the influence of post placement on fracture resistance of endodontically treated mandibular molars restored with adhesive overlay restorations. METHODS Endodontically treated human molars with two- and one-wall cavities either underwent or did not undergo fibre post insertion within composite build-up before cementation of indirect composite onlay restorations. The specimens were thermocycled, exposed to cyclic loading, and submitted to the static fracture resistance test. Fracture loads and mode of failure were evaluated. RESULTS Statistical analysis revealed that specimens with fibre posts demonstrated similar failure loads (p=0.065) but more favourable fracture patterns compared with specimens without fibre posts. No difference was found between two- and one-wall cavities. CONCLUSIONS Within the limitations of this study, the insertion of fibre posts did not improve support under indirect composite overlays. CLINICAL SIGNIFICANCE When restoring heavily broken down endodontically treated mandibular molars with an indirect overlay composite restoration, the fibre post inserted within the composite build-up do not provide any increase in fracture resistance.
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Affiliation(s)
- Nicola Scotti
- University of Turin Dental School, Department of Cariology and Operative Dentistry, via Nizza 230, 10126 Turin, Italy.
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Influence of different restorative techniques on the strength of endodontically treated weakened roots. Int J Dent 2012; 2012:343712. [PMID: 22666251 PMCID: PMC3359834 DOI: 10.1155/2012/343712] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2012] [Revised: 03/06/2012] [Accepted: 03/06/2012] [Indexed: 11/23/2022] Open
Abstract
Objective. Comparing effect of different restoration techniques on fracture resistance of compromised roots. Methods. Crowns of 100 single-rooted teeth were sectioned and 10 roots were kept as negative control group (Group 1). Remaining roots were instrumented and divided into one and positive control group of 10 samples (Group 2) and 4 experimental groups of 20 samples each. Group 3: roots were obturated with gutta-percha; Group 4: roots were restored with gutta-percha, composite, and glass fiber post; Group 5: roots were obturated with Resilon; Group 6: Roots were restored with Resilon, composite, and glass fiber post. Roots were weakened before obturation in groups 2, 3, and 5 and after obturation in groups 4 and 6. Fracture strengths were measured using Dartec testing machine and fracture load was recorded in kilo-Newton. Statistical analysis was done using ANOVA and Tukeys test. Results. The fractures resistance of restored roots was significantly higher in groups 4, 5, and 6 than in Groups 2 and 3. There were no significant differences between groups 1, 4, 5, and 6. Conclusions. Restoration of weakened roots with Resilon or bonding an intermediate composite resin to coronal radicular dentin and to glass fiber post increased their fracture resistance.
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The effect of ferrule on the fracture mode of endodontically treated canines restored with fibre posts and metal-ceramic or all-ceramic crowns. J Dent 2012; 40:276-85. [DOI: 10.1016/j.jdent.2012.01.002] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2011] [Revised: 12/27/2011] [Accepted: 01/02/2012] [Indexed: 11/23/2022] Open
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MAHMOUDI M, SAIDI A, GANDJALIKHAN NASSAB SA, HASHEMIPOUR MA. A three-dimensional finite element analysis of the effects of restorative materials and post geometry on stress distribution in mandibular molar tooth restored with post-core crown. Dent Mater J 2012; 31:171-9. [DOI: 10.4012/dmj.2011-138] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Sherfudhin H, Hobeich J, Carvalho CA, Aboushelib MN, Sadig W, Salameh Z. Effect of different ferrule designs on the fracture resistance and failure pattern of endodontically treated teeth restored with fiber posts and all-ceramic crowns. J Appl Oral Sci 2011; 19:28-33. [PMID: 21437466 PMCID: PMC4245860 DOI: 10.1590/s1678-77572011000100007] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2009] [Accepted: 10/06/2009] [Indexed: 11/28/2022] Open
Abstract
Objective This study investigated the effect of different ferrule heights on endodontically
treated premolars. Materials and Methods Fifty sound mandibular first premolars were endodontically treated and then
restored with 7-mm fiber post (FRC Postec Plus #1 Ivoclar-Vivadent) luted with
self-polymerized resin cement (Multilink, Ivoclar Vivadent) while the coronal
section was restored with hybrid composite core build-up material (Tetric Ceram,
Ivoclar-Vivadent), which received all-ceramic crown. Different ferrule heights
were investigated: 1-mm circumferential ferrule without post and core (group 1
used as control), a circumferential 1-mm ferrule (group 2), non-uniform ferrule
2-mm buccally and 1-mm lingually (group 3), non-uniform ferrule 3-mm buccally and
2-mm lingually (group 4), and finally no ferrule preparation (group 5). The
fracture load and failure pattern of the tested groups were investigated by
applying axial load to the ceramic crowns (n=10). Data were analyzed statistically
by one-way ANOVA and Tukey’s post-hoc test was used for pair-wise
comparisons (α=0.05). Results There were no significant differences among the failure load of all tested groups
(P<0.780). The control group had the lowest fracture resistance
(891.43±202.22 N) and the highest catastrophic failure rate
(P<0.05). Compared to the control group, the use of fiber post reduced the
percentage of catastrophic failure while increasing the ferrule height did not
influence the fracture resistance of the restored specimens. Conclusions Within the limitations of this study, increasing the ferrule length did not
influence the fracture resistance of endodontically treated teeth restored with
glass ceramic crowns. Insertion of a fiber post could reduce the percentage of
catastrophic failure of these restorations under function.
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Affiliation(s)
- Haneef Sherfudhin
- Department of Prosthetic Dental Sciences, College of Dentistry, King Saud University, Riyadh, Saudi Arabia
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Effect of thermal cycling on the bond strength of self-adhesive cements to fiber posts. Clin Oral Investig 2011; 16:909-15. [DOI: 10.1007/s00784-011-0576-1] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2009] [Accepted: 05/26/2011] [Indexed: 10/18/2022]
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Li Q, Yan P, Chen Z. Fracture resistance and failure patterns of open apex root teeth with different posts after endodontic treatment. ACTA ACUST UNITED AC 2011; 31:271. [PMID: 21505998 DOI: 10.1007/s11596-011-0265-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2010] [Indexed: 11/30/2022]
Abstract
The aim of this study is to investigate the influence of different posts on the fracture mechanics of endodontically-treated teeth with open apex. Forty-eight human maxillary anterior teeth were collected, and the root was transversely sectioned 12 mm under the cementoenamal junction (CEJ). These samples were then randomly divided into two groups, i.e., minor diameter open apex root (group A) and major diameter open apex root (group B), with mineral trioxide aggregate (MTA) placed into the apical 4 mm in the root canals. Subsequently, both groups were respectively further divided into three subgroups as follows: fiber-post (subgroup 1), metal post (subgroup 2) and non-post (subgroup 3) group. Teeth were restored with a composite resin crown and tested by using a universal testing machine at the rate of 1 mm/min cross-head. Values of the maximum fracture resistance and failure patterns were recorded and compared among all subgroups. In addition, the changes of MTA properties were carefully examined via X-ray photography. Our results indicate that (1) In group A, the mean value of fracture resistance for teeth restored with fiber posts were statistically higher than that with either metal post or non-post; (2) In group B, there was no statistically significant difference in the mean value of fracture resistance among three subgroups; (3) No statistical significance in the mean value of fracture resistance was found between group A and group B; (4) The failure modes of most samples (58%) were irreparable; (5) MTA in two teeth developed cracks after loading tests. In conclusion, endodontically-treated teeth restored with fiber posts are more resistant to fracture than those restored with either metal posts or non-post, and most of the fracture modes are catastrophic in nature.
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Affiliation(s)
- Qiuhui Li
- Key Laboratory for Oral Biomedicine of Ministry of Education School and Hospital of Stomatology, Wuhan University, Wuhan, 430079, China
| | - Ping Yan
- Key Laboratory for Oral Biomedicine of Ministry of Education School and Hospital of Stomatology, Wuhan University, Wuhan, 430079, China
| | - Zhi Chen
- Key Laboratory for Oral Biomedicine of Ministry of Education School and Hospital of Stomatology, Wuhan University, Wuhan, 430079, China.
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Al-Omiri MK, Mahmoud AA, Rayyan MR, Abu-Hammad O. Fracture Resistance of Teeth Restored with Post-retained Restorations: An Overview. J Endod 2010; 36:1439-49. [PMID: 20728706 DOI: 10.1016/j.joen.2010.06.005] [Citation(s) in RCA: 95] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2010] [Revised: 05/29/2010] [Accepted: 06/20/2010] [Indexed: 11/30/2022]
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CECCHIN D, FARINA AP, GUERREIRO CAM, CARLINI-JÃNIOR B. Fracture resistance of roots prosthetically restored with intra-radicular posts of different lengths. J Oral Rehabil 2010; 37:116-22. [DOI: 10.1111/j.1365-2842.2009.02028.x] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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