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Skalskyi V, Makeev V, Stankevych O, Pavlychko R. Features of fracture of prosthetic tooth-endocrown constructions by means of acoustic emission analysis. Dent Mater 2018; 34:e46-e55. [DOI: 10.1016/j.dental.2018.01.023] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2017] [Revised: 12/07/2017] [Accepted: 01/16/2018] [Indexed: 11/30/2022]
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52
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Yoon HG, Oh HK, Lee DY, Shin JH. 3-D finite element analysis of the effects of post location and loading location on stress distribution in root canals of the mandibular 1st molar. J Appl Oral Sci 2018; 26:e20160406. [PMID: 29451648 PMCID: PMC5815358 DOI: 10.1590/1678-7757-2016-0406] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2016] [Accepted: 12/22/2016] [Indexed: 01/21/2023] Open
Abstract
Objective The purpose of this study was to evaluate, by using finite element analysis, the influence of post location and occlusal loading location on the stress distribution pattern inside the root canals of the mandibular 1st molar. Material and Methods Three different 3-D models of the mandibular 1st molar were established: no post (NP) – a model of endodontic and prosthodontic treatments; mesiobuccal post (MP) – a model of endodontic and prosthodontic treatments with a post in the mesiobuccal canal; and distal post (DP) – a model of endodontic and prosthodontic treatments with a post in the distal canal. A vertical force of 300 N, perpendicular to the occlusal plane, was applied to one of five 1 mm2 areas on the occlusal surface; mesial marginal ridge, distal marginal ridge, mesiobuccal cusp, distobuccal cusp, and central fossa. Finite element analysis was used to calculate the equivalent von Mises stresses on each root canal. Results The DP model showed similar maximum stress values to the NP model, while the MP model showed markedly greater maximum stress values. The post procedure increased stress concentration inside the canals, although this was significantly affected by the site of the force. Conclusions In the mandibular 1st molar, the distal canal is the better place to insert the post than the mesiobuccal canal. However, if insertion into the mesiobuccal canal is unavoidable, there should be consideration on the occlusal contact, making central fossa and distal marginal ridge the main functioning areas.
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Affiliation(s)
- Hong Gi Yoon
- Department of Conservative Dentistry, Seoul National University Dental Hospital, Seoul, South Korea
| | - Hyun Keun Oh
- Department of Orthodontics, Graduate School of Clinical Dentistry, Korea University, Seoul, South Korea
| | - Dong-Yul Lee
- Department of Orthodontics, Korea University Guro Hospital, Seoul, South Korea
| | - Joo-Hee Shin
- Department of Conservative Dentistry, Korea University Guro Hospital, Seoul, South Korea
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53
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Helal MA, Wang Z. Biomechanical Assessment of Restored Mandibular Molar by Endocrown in Comparison to a Glass Fiber Post‐Retained Conventional Crown: 3D Finite Element Analysis. J Prosthodont 2017; 28:988-996. [PMID: 29067737 DOI: 10.1111/jopr.12690] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/02/2017] [Indexed: 11/27/2022] Open
Affiliation(s)
- Mohammed Abu Helal
- Prosthodontic Department, Henan Provincial People's HospitalPeople's Hospital of Zhengzhou University Zhengzhou China
| | - Zhigang Wang
- Prosthodontic Department, Henan Provincial People's HospitalPeople's Hospital of Zhengzhou University Zhengzhou China
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Einhorn M, DuVall N, Wajdowicz M, Brewster J, Roberts H. Preparation Ferrule Design Effect on Endocrown Failure Resistance. J Prosthodont 2017; 28:e237-e242. [DOI: 10.1111/jopr.12671] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/18/2017] [Indexed: 11/30/2022] Open
Affiliation(s)
| | | | - Michael Wajdowicz
- Graduate Dental Research; USAF Postgraduate School Keesler Air Force Base; MS
| | - John Brewster
- Graduate Dental Research; USAF Postgraduate School Keesler Air Force Base; MS
| | - Howard Roberts
- Graduate Dental Research; USAF Postgraduate School Keesler Air Force Base; MS
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Atash R, Arab M, Duterme H, Cetik S. Comparison of resistance to fracture between three types of permanent restorations subjected to shear force: An in vitro study. J Indian Prosthodont Soc 2017; 17:239-249. [PMID: 28936037 PMCID: PMC5601495 DOI: 10.4103/jips.jips_24_17] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2017] [Accepted: 05/19/2017] [Indexed: 11/04/2022] Open
Abstract
Introduction: Our study's objective was to compare resistance to fracture between endocrown and conventional post and core restorations when subjected to shear force. Materials and Methods: Thirty human mandibular premolars were extracted for orthodontic reasons, endodontically treated, and restored using three different methods: endocrown, glass fiber post and composite resin core, and metal post. All the crowns were made from IPS e.max ceramic. Shear forces were applied to these restorations using a test machine until breakage. Load and displacement were recorded every 0.1 s. Results: No significant difference was observed in resistance to fracture between glass fiber post and metal post. No relationship between the displacement of prosthetic dental system and type of material used was uncovered and by comparing the type of fracture with the restoration material used. However, a greater number of favorable fractures were observed in the glass fiber group whereas most of the fractures in the endocrown and metal post groups were unfavorable. Conclusion: Endocrown displays better resistance to fracture compared to conventional post and core restorations. In addition, endocrown did not show more displacement or cause more unfavorable fractures than the conventional restorations. This restoration may represent a reliable alternative for restoring a damaged, endodontically treated tooth.
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Affiliation(s)
- Ramin Atash
- Department of Stomatology and Dentistry, Erasmus Hospital, Université Libre de Bruxelles, Brussels, Belgium
| | - Maiyas Arab
- Department of Stomatology and Dentistry, Erasmus Hospital, Université Libre de Bruxelles, Brussels, Belgium
| | - Hadrien Duterme
- Department of Stomatology and Dentistry, Erasmus Hospital, Université Libre de Bruxelles, Brussels, Belgium
| | - Sibel Cetik
- Department of Stomatology and Dentistry, Erasmus Hospital, Laboratory of Physiology and Pharmaceutics, Faculty of Medicine, Université Libre de Bruxelles, Brussels, Belgium
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56
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Dejak B, Młotkowski A. Strength comparison of anterior teeth restored with ceramic endocrowns vs custom-made post and cores. J Prosthodont Res 2017; 62:171-176. [PMID: 28886951 DOI: 10.1016/j.jpor.2017.08.005] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2017] [Revised: 07/28/2017] [Accepted: 08/16/2017] [Indexed: 10/18/2022]
Abstract
PURPOSE The aim of the study was to compare strength of the anterior teeth restored with ceramic endocrowns versus custom-made post and core. METHODS The investigation used the finite element analysis. Three 3-D models of maxillary central incisor were created: model A-tooth restored with metal post and core with ceramic crown; model B-tooth with leucite ceramic endocrown; model C-tooth with lithium disilicate ceramic endocrown. Each model was subjected to a 100N force applied at a distance of 5mm from the incisal edge, at the angle of 130° to the long axis of the tooth. The modified von Mises failure criterion was used to evaluate the strength of the dentin, ceramic and resin cement, and Huber-Mises-Hencky failure criterion for cast alloy. Contact stresses in the cement-tissue adhesive interface were calculated. RESULTS The lowest stresses occurred in the anterior tooth restored with custom post and core (model A). The mvM stress of 47.5MPa concentrated in leucite ceramic endocrown (model B) and its value was close to the tensile strength of this material. The maximal mvM stresses in the lithium disilicate ceramic endocrown (model C) were 4 times lower than tensile strength of this material. In all cases contact stresses in the adhesive interface under restorations did not exceed the resin cement bond strength to dentin. CONCLUSIONS Leucite ceramic endocrowns in incisors may fracture during physiological loading. Endocrowns made of lithium disilicate ceramic are resistant to failure. Posts and prosthetic crowns are still recommended for anterior teeth restorations.
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Affiliation(s)
- Beata Dejak
- Department of Prosthetic Dentistry, Medical University of Lodz, Lodz, Poland.
| | - Andrzej Młotkowski
- Department of Strength of Materials and Structures, Technical University of Lodz, Lodz, Poland
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57
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Fages M, Corn S, Slangen P, Raynal J, Ienny P, Turzo K, Cuisinier F, Durand JC. Glass Ceramic CAD/CAM crowns and severely altered posterior teeth: a three levels study. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2017; 28:145. [PMID: 28823063 DOI: 10.1007/s10856-017-5948-x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/25/2017] [Accepted: 07/19/2017] [Indexed: 06/07/2023]
Abstract
For many practitioners, longevity of full glass ceramic crowns in the posterior area, molars and premolars, remains a real challenge. The purpose of this article is to identify and evaluate the parameters that can significantly influence their resistance when preparing a tooth. The analysis proposed in this article relies on interrelated studies conducted at three levels: in vitro (mechanical tests), in silico (finite elements simulations) and in vivo (clinical survival rates). The in vitro and the in silico studies proved that an appropriate variation of the geometric design of the preparations enables to increase up to 80% the mechanical strength of ceramic reconstructions. The in vivo clinical study of CAD/CAM full ceramic crowns was performed in accordance with the principles stated within the in vitro and the in silico studies and provided a 98.97% success rate over a 6 years period. The variations of geometric design parameters for dental preparation allows for reconstructions with a mechanical breaking up to 80% higher than that of a non-appropriate combination. These results are confirmed in clinical practice.
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Affiliation(s)
- Michel Fages
- LBN (Laboratoire de Bioingénierie et Nanosciences) EA4203, Univ. Montpellier, Montpellier, France
| | - Stephane Corn
- C2MA (Materials Center), Ecole des mines d'Alès, Alès, France
| | - Pierre Slangen
- LGEI (Laboratory of Industrial Environment Engineering), Ecole des mines d'Alès, Alès, France
| | - Jacques Raynal
- Department of Prosthodontics, Faculty of Odontology, Univ. Montpellier, Montpellier, France
| | - Patrick Ienny
- C2MA (Materials Center), Ecole des mines d'Alès, Alès, France
| | - Kinga Turzo
- Department of Oral Biology and Experimental Dental Research, Faculty of Dentistry, University of Szeged, Szeged, Hungary
| | - Frederic Cuisinier
- LBN (Laboratoire de Bioingénierie et Nanosciences) EA4203, Univ. Montpellier, Montpellier, France
| | - Jean-Cédric Durand
- LBN (Laboratoire de Bioingénierie et Nanosciences) EA4203, Univ. Montpellier, Montpellier, France.
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No post-no core approach to restore severely damaged posterior teeth: An up to 10-year retrospective study of documented endocrown cases. J Dent 2017; 63:1-7. [DOI: 10.1016/j.jdent.2017.04.009] [Citation(s) in RCA: 63] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2017] [Revised: 04/19/2017] [Accepted: 04/25/2017] [Indexed: 11/21/2022] Open
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59
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Zoidis P, Bakiri E, Polyzois G. Using modified polyetheretherketone (PEEK) as an alternative material for endocrown restorations: A short-term clinical report. J Prosthet Dent 2017; 117:335-339. [DOI: 10.1016/j.prosdent.2016.08.009] [Citation(s) in RCA: 45] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2016] [Revised: 08/08/2016] [Accepted: 08/12/2016] [Indexed: 11/30/2022]
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60
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Evaluation of the marginal and internal discrepancies of CAD-CAM endocrowns with different cavity depths: An in vitro study. J Prosthet Dent 2017; 117:109-115. [DOI: 10.1016/j.prosdent.2016.03.025] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2015] [Revised: 03/30/2016] [Accepted: 03/30/2016] [Indexed: 11/19/2022]
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61
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Guldener KA, Lanzrein CL, Siegrist Guldener BE, Lang NP, Ramseier CA, Salvi GE. Long-term Clinical Outcomes of Endodontically Treated Teeth Restored with or without Fiber Post-retained Single-unit Restorations. J Endod 2016; 43:188-193. [PMID: 27939825 DOI: 10.1016/j.joen.2016.10.008] [Citation(s) in RCA: 51] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2016] [Revised: 09/14/2016] [Accepted: 10/10/2016] [Indexed: 12/11/2022]
Abstract
INTRODUCTION The aim of the present study was to evaluate both survival and failure rates of endodontically treated teeth restored with or without fiber post-retained restorations after a mean observation period of at least 5 years. METHODS A total of 144 single-rooted and multirooted teeth in 100 subjects were endodontically treated following a predetermined aseptic protocol and restored with either a fiber post and a composite core or a composite filling without intraradicular retention. A fiber post was cemented when the teeth presented with only 1 wall and/or less than one third of the remaining height of the clinical crown. After a comprehensive treatment plan, the teeth were restored with either a direct composite restoration or a single-unit crown. Endodontically treated teeth supporting fixed and removable dental prostheses and telescopic crowns were excluded from the analysis. Success was defined as tooth survival without any treatment of biological and/or technical complications. RESULTS The overall tooth survival rate was 89.6% after a mean observation time of 8.8 ± 2.3 years. The survival rate of teeth with a fiber post amounted to 94.3%, and for teeth without a post, it was 76.3% (P < .001). The main reason for tooth loss was root fracture (9.7%). No loss of post retention was observed. Successfully treated teeth without any biological and/or technical complications and requiring no additional treatment during the entire observation period amounted to 79.9%. CONCLUSIONS Endodontically treated teeth restored with fiber posts and either a direct composite restoration or a single-unit crown yielded higher survival and success rates compared with teeth restored without fiber posts. Vertical fractures of roots not containing a post represented a frequently encountered and serious problem.
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Affiliation(s)
- Kevin A Guldener
- Department of Periodontology, School of Dental Medicine, University of Bern, Bern, Switzerland
| | - Carla L Lanzrein
- Private Practice, Thun, Switzerland; Private Practice, Fribourg, Switzerland
| | - Beatrice E Siegrist Guldener
- Department of Periodontology, School of Dental Medicine, University of Bern, Bern, Switzerland; Private Practice, Bern, Switzerland
| | - Niklaus P Lang
- Department of Periodontology, School of Dental Medicine, University of Bern, Bern, Switzerland; Center for Dental Medicine, University of Zürich, Zürich, Switzerland
| | - Christoph A Ramseier
- Department of Periodontology, School of Dental Medicine, University of Bern, Bern, Switzerland
| | - Giovanni E Salvi
- Department of Periodontology, School of Dental Medicine, University of Bern, Bern, Switzerland.
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62
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Aktas G, Yerlikaya H, Akca K. Mechanical Failure of Endocrowns Manufactured with Different Ceramic Materials: An In Vitro Biomechanical Study. J Prosthodont 2016; 27:340-346. [PMID: 27465810 DOI: 10.1111/jopr.12499] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/09/2016] [Indexed: 11/30/2022] Open
Abstract
PURPOSE To evaluate the effect of different silica-based ceramic materials on the mechanical failure behavior of endocrowns used in the restoration of endodontically treated mandibular molar teeth. MATERIALS AND METHODS Thirty-six intact mandibular molar teeth extracted because of a loss of periodontal support received root canal treatment. The teeth were prepared with a central cavity to support the endocrowns, replacing the occlusal surface with mesial-lingual-distal walls. Data acquisition of the prepared tooth surfaces was carried out digitally with a powder-free intraoral scanner. Restoration designs were completed on manufactured restorations from three silicate ceramics: alumina-silicate (control), zirconia-reinforced (Zr-R), and polymer-infiltrated (P-I). Following adhesive cementation, endocrowns were subjected to thermal aging, and then, each specimen was obliquely loaded to record the fracture strength and define the mechanical failure. For the failure definition, the fracture type characteristics were identified, and further analytic measurements were made on the fractured tooth and ceramic structure. RESULTS Load-to-fracture failure did not differ significantly, and the calculated mean values were 1035.08 N, 1058.33 N, and 1025.00 N for control, Zr-R, and P-I groups, respectively; however, the stiffness of the restoration-tooth complex was significantly higher than that in both test groups. No statistically significant correlation was established in paired comparisons of the failure strength, restorative stiffness, and fractured tooth distance parameters. The failure mode for teeth restored with zirconia-reinforced glass ceramics was identified as non-restorable. The resin interface in the control and P-I groups presented similar adhesive failure behavior. CONCLUSION Mechanical failure of endocrown restorations does not significantly differ for silica-based ceramics modified either with zirconia or polymer.
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Affiliation(s)
- Guliz Aktas
- Department of Prosthodontics, Hacettepe University, Ankara, Turkey
| | - Hatice Yerlikaya
- Department of Prosthodontics, Hacettepe University, Ankara, Turkey
| | - Kivanc Akca
- Department of Prosthodontics, Hacettepe University, Ankara, Turkey
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63
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Gresnigt MM, Özcan M, van den Houten ML, Schipper L, Cune MS. Fracture strength, failure type and Weibull characteristics of lithium disilicate and multiphase resin composite endocrowns under axial and lateral forces. Dent Mater 2016; 32:607-14. [DOI: 10.1016/j.dental.2016.01.004] [Citation(s) in RCA: 78] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2015] [Revised: 06/20/2015] [Accepted: 01/15/2016] [Indexed: 11/30/2022]
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64
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Spreafico R, Brenna F, Nuvina M, Robello C, Gagliani M. Le ricostruzioni parziali in elementi vitali e non vitali per mezzo di restauri indiretti realizzati con metodiche CAD/CAM chairside. DENTAL CADMOS 2016. [DOI: 10.1016/s0011-8524(16)30037-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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65
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Effect of root canal treatment procedures with a novel rotary nickel titanium instrument (TRUShape) on stress in mandibular molars: a comparative finite element analysis. Odontology 2016; 105:54-61. [DOI: 10.1007/s10266-016-0232-y] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2015] [Accepted: 12/23/2015] [Indexed: 10/22/2022]
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66
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Vukicevic AM, Zelic K, Jovicic G, Djuric M, Filipovic N. Influence of dental restorations and mastication loadings on dentine fatigue behaviour: Image-based modelling approach. J Dent 2015; 43:556-67. [DOI: 10.1016/j.jdent.2015.02.011] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2014] [Revised: 02/09/2015] [Accepted: 02/23/2015] [Indexed: 10/23/2022] Open
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Sevimli G, Cengiz S, Oruc MS. Endocrowns: review. J Istanb Univ Fac Dent 2015; 49:57-63. [PMID: 28955538 PMCID: PMC5573486 DOI: 10.17096/jiufd.71363] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2013] [Accepted: 12/02/2014] [Indexed: 11/22/2022] Open
Abstract
The ideal restoration of endodontically treated
teeth (ETT) has been widely and controversially
discussed in the literature. Prevention of healthy
dental structure is essential to help mechanical
stabilization of tooth-restoration integrity, increase
the amount of suitable surfaces for adhesion and
thus positively affect the long-term success. ETT are
affected by a higher risk of biomechanical failure than
vital teeth. With the development of adhesive systems,
the need for post-core restorations is also reduced.
Especially for restoration of excessively damaged
ETT, endocrowns have been used as an alternative to
the conventional post-core and fixed partial dentures.
Compared to conventional methods, good aesthetics,
better mechanical performance, and less cost and
clinic time are the advantages of endocrowns.
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Affiliation(s)
- Gaye Sevimli
- Department of Prosthodontics, Faculty of Dentistry, Bulent Ecevit University, Turkey
| | - Seda Cengiz
- Department of Prosthodontics, Faculty of Dentistry, Bulent Ecevit University, Turkey
| | - M Selcuk Oruc
- Department of Prosthodontics, Faculty of Dentistry, Bulent Ecevit University, Turkey
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68
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Baba NZ, Goodacre CJ. Restoration of endodontically treated teeth: contemporary concepts and future perspectives. ACTA ACUST UNITED AC 2014. [DOI: 10.1111/etp.12066] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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69
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Cytotoxicity of post and core composites as a function of environmental conditions. Dent Mater 2014; 30:1179-86. [DOI: 10.1016/j.dental.2014.07.011] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2013] [Revised: 07/23/2014] [Accepted: 07/23/2014] [Indexed: 11/20/2022]
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70
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Murakami N, Wakabayashi N. Finite element contact analysis as a critical technique in dental biomechanics: A review. J Prosthodont Res 2014; 58:92-101. [DOI: 10.1016/j.jpor.2014.03.001] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2014] [Accepted: 03/10/2014] [Indexed: 10/25/2022]
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