1
|
Solomonov M, Hadad A, Ben Itzhak J, Lvovsky A, Azizi H. Is a Pre-Existent Cone-Beam Computed Tomography Able to Detect Metal Dental Posts? Dent J (Basel) 2024; 12:229. [PMID: 39057016 PMCID: PMC11276458 DOI: 10.3390/dj12070229] [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: 06/04/2024] [Revised: 06/30/2024] [Accepted: 07/17/2024] [Indexed: 07/28/2024] Open
Abstract
(1) Background: In this study, the efficacy of cone-beam computed tomography (CBCT) in detecting dental posts was compared to periapical radiography. (2) Methods: A retrospective evaluation of 53 patients' periapical radiographs and CBCT images was performed. The presence and type of the intra-canal dental post were initially determined on the periapical images (PA) radiographs' examination and were then compared to the observer's ability to detect the dental post on a CBCT image. The effect of the post's type (metal cast or prefabricated) on its detection on CBCT images was determined. (3) Results: 10.5% of teeth that were identified as having a post on a PA radiograph were not identified as having a post on the CBCT examination (p < 0.05). Approximately 17.6% of teeth that were identified as not having a post on a PA radiograph were identified as having a post on the CBCT examination (p < 0.05). Moreover, 16.3% and 50% of teeth with a prefabricated or cast posts on PA radiographs were falsely identified on the CBCT examination, respectively (p < 0.05). (4) Conclusions: A CBCT image is an insufficient tool for the identification of metal prefabricated and cast posts. A PA image is the recommended radiographic tool for achieving information about the post-endodontic restoration status of teeth candidates for endodontic retreatment in patients with a former CBCT scan.
Collapse
Affiliation(s)
- Michael Solomonov
- Department of Endodontics, Israel Defense Forces (IDF) Medical Corps, Tel Hashomer, Ramat Gan, Israel
- “Bina” Program, Faculty of Dental Medicine, Hebrew University of Jerusalem, 12271 Jerusalem, Israel
| | - Avi Hadad
- Department of Endodontics, Israel Defense Forces (IDF) Medical Corps, Tel Hashomer, Ramat Gan, Israel
- “Bina” Program, Faculty of Dental Medicine, Hebrew University of Jerusalem, 12271 Jerusalem, Israel
| | - Joe Ben Itzhak
- Department of Endodontics, Israel Defense Forces (IDF) Medical Corps, Tel Hashomer, Ramat Gan, Israel
- “Bina” Program, Faculty of Dental Medicine, Hebrew University of Jerusalem, 12271 Jerusalem, Israel
| | - Alex Lvovsky
- Department of Endodontics, Israel Defense Forces (IDF) Medical Corps, Tel Hashomer, Ramat Gan, Israel
- “Bina” Program, Faculty of Dental Medicine, Hebrew University of Jerusalem, 12271 Jerusalem, Israel
| | - Hadas Azizi
- Department of Endodontics, Israel Defense Forces (IDF) Medical Corps, Tel Hashomer, Ramat Gan, Israel
- “Bina” Program, Faculty of Dental Medicine, Hebrew University of Jerusalem, 12271 Jerusalem, Israel
| |
Collapse
|
2
|
Iaculli F, Rengo C, Lodato V, Patini R, Spagnuolo G, Rengo S. Fracture resistance of endodontically-treated maxillary premolars restored with different type of posts and direct composite reconstructions: A systematic review and meta-analysis of in vitro studies. Dent Mater 2021; 37:e455-e484. [PMID: 34148785 DOI: 10.1016/j.dental.2021.06.007] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2021] [Revised: 05/31/2021] [Accepted: 06/02/2021] [Indexed: 12/22/2022]
Abstract
OBJECTIVE To conduct a systematic review and meta-analysis to assess if the presence of an endodontic post may increase the fracture resistance of endodontically-treated maxillary premolars directly restored with composite. METHODS A comprehensive systematic literature search according to the PRISMA statement was conducted to assess in vitro studies including endodontically-treated maxillary premolars, restored with different type of posts supporting direct composite reconstructions. Two groups of meta-analyses were performed using fixed effects model and additional Trial Sequential Analysis (TSA) was carried out. Moreover, risk of bias was conducted and quality of evidence for any performed meta-analysis was assessed using Grading of Recommendations Assessment, Development and Evaluation (GRADE). RESULTS Twenty-four articles met the inclusion criteria and 13 studies also underwent quantitative evaluation. Fracture resistance of endodontically-treated premolars restored with fiber posts was significantly less than sound teeth (p value: < 0.00001), however endodontically-treated premolars with a fiber post provided an increase in fracture resistance when compared to equivalent teeth restored without post (p value: 0.003). TSA revealed high power of both meta-analyses. Moderate risk of bias was reported in 23/24 studies; only 1 study showed high risk of bias. GRADE system showed moderate strength of evidence due to the presence of a study with high risk of bias and to wide confidence intervals. SIGNIFICANCE Within the limitation of the present systematic review and meta-analysis, it can be concluded that endodontically-treated maxillary premolars restored with a fiber post and direct composite restoration demonstrated increased fracture resistance when compared to equivalent teeth without post.
Collapse
Affiliation(s)
- Flavia Iaculli
- Department of Neuroscience and Reproductive and Odontostomatological Sciences, University of Naples "Federico II", Naples, Italy
| | - Carlo Rengo
- Department of Prosthodontics and Dental Materials, School of Dental Medicine, University of Siena, Siena, Italy
| | - Vincenzo Lodato
- Department of Neuroscience and Reproductive and Odontostomatological Sciences, University of Naples "Federico II", Naples, Italy
| | - Romeo Patini
- Department of Head, Neck and Sense Organs "Fondazione Policlinico Universitario A. Gemelli- IRCCS", School of Dentistry, Rome, Italy
| | - Gianrico Spagnuolo
- Department of Neuroscience and Reproductive and Odontostomatological Sciences, University of Naples "Federico II", Naples, Italy.
| | - Sandro Rengo
- Department of Neuroscience and Reproductive and Odontostomatological Sciences, University of Naples "Federico II", Naples, Italy
| |
Collapse
|
3
|
Carvalho MAD, Lazari PC, Gresnigt M, Del Bel Cury AA, Magne P. Current options concerning the endodontically-treated teeth restoration with the adhesive approach. Braz Oral Res 2018; 32:e74. [DOI: 10.1590/1807-3107bor-2018.vol32.0074] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2018] [Accepted: 06/12/2018] [Indexed: 01/21/2023] Open
|
4
|
Zarow M, Ramírez-Sebastià A, Paolone G, de Ribot Porta J, Mora J, Espona J, Durán-Sindreu F, Roig M. A new classification system for the restoration of root filled teeth. Int Endod J 2017; 51:318-334. [DOI: 10.1111/iej.12847] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2015] [Accepted: 08/23/2017] [Indexed: 12/28/2022]
Affiliation(s)
| | - A. Ramírez-Sebastià
- Department of Restorative Dentistry and Endodontics; School of Dentistry; Universitat Internacional de Catalunya; Barcelona Spain
| | - G. Paolone
- Dental School; Universitá Vita e Salute San Raffaele; Milan Italy
| | - J. de Ribot Porta
- Department of Restorative Dentistry and Endodontics; School of Dentistry; Universitat Internacional de Catalunya; Barcelona Spain
| | - J. Mora
- Department of Restorative Dentistry and Endodontics; School of Dentistry; Universitat Internacional de Catalunya; Barcelona Spain
| | - J. Espona
- Department of Restorative Dentistry and Endodontics; School of Dentistry; Universitat Internacional de Catalunya; Barcelona Spain
| | - F. Durán-Sindreu
- Department of Restorative Dentistry and Endodontics; School of Dentistry; Universitat Internacional de Catalunya; Barcelona Spain
| | - M. Roig
- Department of Restorative Dentistry and Endodontics; School of Dentistry; Universitat Internacional de Catalunya; Barcelona Spain
| |
Collapse
|
5
|
|
6
|
Derceli JDR, Fais LMG, Pinelli LAP. A castor oil-containing dental luting agent: effects of cyclic loading and storage time on flexural strength. J Appl Oral Sci 2015; 22:496-501. [PMID: 25591018 PMCID: PMC4307762 DOI: 10.1590/1678-775720140069] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2014] [Accepted: 08/08/2014] [Indexed: 11/21/2022] Open
Abstract
Favorable results in the use of castor oil polyurethane (COP) as pulp capping, membrane material, sealer, mouthwash and in bone repair, associated with the fact that Ricinus communis is not derived from petroleum and it is abundant in Brazil, encourage researches in the development of luting agents.
Collapse
Affiliation(s)
- Juliana Dos Reis Derceli
- Department of Restorative Dentistry, Ribeirão Preto School of Dentistry, University of São Paulo, Ribeirão Preto, SP, Brazil
| | - Laiza Maria Grassi Fais
- Department of Dental Materials and Prosthodontics, Araraquara Dental School, Universidade Estadual Paulista, Araraquara, SP, Brazil
| | - Lígia Antunes Pereira Pinelli
- Department of Dental Materials and Prosthodontics, Araraquara Dental School, Universidade Estadual Paulista, Araraquara, SP, Brazil
| |
Collapse
|
7
|
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]
|
8
|
Lima AFD, Spazzin AO, Galafassi D, Correr-Sobrinho L, Carlini-Júnior B. Influence of ferrule preparation with or without glass fiber post on fracture resistance of endodontically treated teeth. J Appl Oral Sci 2010; 18:360-3. [PMID: 20835570 PMCID: PMC5349065 DOI: 10.1590/s1678-77572010000400007] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2009] [Accepted: 10/09/2009] [Indexed: 11/22/2022] Open
Abstract
Objective This study evaluated the effect of ferrule preparation (Fp) on the fracture
resistance of endodontically treated teeth, restored with composite resin cores
with or without glass fiber posts. Material and Methods Forty-four bovine teeth were sectioned 19 or 17 mm (2 mm ferrule) from the apex,
endodontically treated and assigned to four groups (n = 11): Group 1: Fp and post;
Group 2: Fp and without post; Group 3: without Fp and with post; Group 4: without
Fp and without post. All specimens were restored with composite resin core and
metal crown. Specimens were subjected to fracture resistance testing in a
universal testing machine at a crosshead speed of 0.5 mm/min. The data were
analyzed by two-way ANOVA and Tukey’s tests (α=0.05). Results The mean fracture resistance values were as follows: Group 1: 573.3 N; Group 2:
552.5 N; Group 3: 275.3 N; Group 4: 258.6 N. Significantly higher fracture
resistance was found for the groups with Fp (p<0.001). Conclusion There was no statistically significant interaction between the "Fp" and "post"
factors (p = 0.954). The ferrule preparation increased the fracture resistance of
endodontically treated teeth. However, the use of glass fiber post showed no
significant influence on the fracture resistance.
Collapse
Affiliation(s)
- Alexandra Furtado de Lima
- Department of Restorative Dentistry, Dental School, University of Passo Fundo, Passo Fundo, RS, Brazil
| | | | | | | | | |
Collapse
|
9
|
Lencioni KA, Menani LR, Macedo AP, Ribeiro RF, de Almeida RP. Tensile bond strength of cast commercially pure titanium dowel and cores cemented with three luting agents. J Prosthodont Res 2010; 54:164-7. [PMID: 20363204 DOI: 10.1016/j.jpor.2010.03.002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2009] [Revised: 02/23/2010] [Accepted: 03/10/2010] [Indexed: 10/19/2022]
Abstract
PURPOSE The purpose of this study was to compare the tensile strength of commercially pure titanium dowels and cores cemented with zinc phosphate or resin cements. METHODS Twenty-one extracted human canines were endodontically treated. The root preparations were accomplished using Largo reamers (10mm in depth and 1.7 mm in diameter). Acrylic resin patterns for the dowel and cores were made, and specimens were cast in commercially pure titanium (n=7) and divided in three groups: TZ-CP Ti dowels luted with zinc phosphate luting agent, TP-CP Ti dowels luted with Panavia F and TR-CP Ti dowels luted with RelyX U100. Tensile strengths were measured in a universal testing machine at a crosshead speed of 0.5mm/min. The results (N) were statistically analyzed by ANOVA and Tukey tests (α=0.01). RESULTS The ANOVA indicated that there were significant differences among the groups tested. A Tukey multiple comparison procedure was performed and revealed statistically significant higher retention values for the dowel luted with RelyX U100 when compared with zinc phosphate or Panavia F. CONCLUSION Cast commercially pure titanium dowels and cores fixed with RelyX U100 cement presented superior bond strength retention when compared to zinc phosphate and Panavia F.
Collapse
Affiliation(s)
- Karina Albino Lencioni
- Department of Dental Materials and Prosthodontics, Dental School of Ribeirão Preto, University of São Paulo, Brazil
| | | | | | | | | |
Collapse
|
10
|
Ma PS, Nicholls JI, Junge T, Phillips KM. Load fatigue of teeth with different ferrule lengths, restored with fiber posts, composite resin cores, and all-ceramic crowns. J Prosthet Dent 2009; 102:229-34. [DOI: 10.1016/s0022-3913(09)60159-1] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
11
|
Meira JBC, Espósito COM, Quitero MFZ, Poiate IAVP, Pfeifer CSC, Tanaka CB, Ballester RY. Elastic modulus of posts and the risk of root fracture. Dent Traumatol 2009; 25:394-8. [DOI: 10.1111/j.1600-9657.2009.00772.x] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
12
|
NAUMANN M, METZDORF G, FOKKINGA W, WATZKE R, STERZENBACH G, BAYNE S, ROSENTRITT M. Influence of test parameters onin vitrofracture resistance of post-endodontic restorations: a structured review. J Oral Rehabil 2009; 36:299-312. [DOI: 10.1111/j.1365-2842.2009.01940.x] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
13
|
NISHIMURA Y, TSUBOTA Y, FUKUSHIMA S. Influence of Cyclic Loading on Fiber Post and Composite Resin Core. Dent Mater J 2008; 27:356-61. [DOI: 10.4012/dmj.27.356] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
14
|
Preuss A, Rosentritt M, Frankenberger R, Beuer F, Naumann M. Influence of type of luting cement used with all-ceramic crowns on load capability of post-restored endodontically treated maxillary central incisors. Clin Oral Investig 2007; 12:151-6. [DOI: 10.1007/s00784-007-0164-6] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2007] [Accepted: 11/05/2007] [Indexed: 11/28/2022]
|
15
|
Uy JN, Lian JNC, Nicholls JI, Tan KBC. Load-fatigue performance of gold crowns luted with resin cements. J Prosthet Dent 2006; 95:315-22. [PMID: 16616130 DOI: 10.1016/j.prosdent.2006.01.016] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
STATEMENT OF PROBLEM Resin cements have gained popularity over the past few years because of their improved physical properties. There is a need to test these cements under fatigue loading, as there is growing recognition that fatigue testing is more clinically relevant than traditional monotonic static tests. PURPOSE This study investigated the load-fatigue performance of complete gold crowns cemented with 4 types of resin cement. MATERIAL AND METHODS Four resin cements (C & B Opaque [CBO], Calibra Esthetic [CE], RelyX Unicem [RU], and Panavia F [PF]) and a control, zinc phosphate cement (HY-Bond [HBZPC]) were tested. Fifty human maxillary premolars were prepared to an occluso-cervical dimension of 4 mm and a convergence angle of 20 degrees. Complete gold crowns were cast (Strator 3) and cemented with 1 of the 5 cements (n=10). A fatigue load of 73.5 N was applied at an angle of 135 degrees to the long axis of each tooth-crown specimen. Preliminary failure was defined as the propagation of a crack in or around the crown luting cement layer. The number of cycles to preliminary failure and the cement failure location were determined. Significant differences in cycles to preliminary failure were assessed by the nonparametric Kruskal-Wallis test, with follow-up Mann-Whitney tests (alpha=.05). RESULTS Group CE had the highest rank of cycles to preliminary failure, while HBZPC had the lowest cycles to preliminary failure. Group CE had a significantly higher failure cycle count compared to PF (P=.016), RU (P=.001), and HBZPC (P<.001), but was not significantly different from CBO (P=.112). There was no significant difference in the failure cycle count between RU and HBZPC (P=.070). CONCLUSION Not all tested resin cements had a superior fatigue life when compared with zinc phosphate cement. Of the 4 resin cement groups, Groups CE, CBO, and PF were significantly superior to HBZPC.
Collapse
Affiliation(s)
- Joanne Ngo Uy
- Department of Restorative Dentistry, Faculty of Dentistry, National University of Singapore, Republic of Singapore.
| | | | | | | |
Collapse
|
16
|
KISHEN ANIL. Mechanisms and risk factors for fracture predilection in endodontically treated teeth. ACTA ACUST UNITED AC 2006. [DOI: 10.1111/j.1601-1546.2006.00201.x] [Citation(s) in RCA: 197] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
|
17
|
Kishen A. Periapical biomechanics and the role of cyclic biting force in apical retrograde fluid movement. Int Endod J 2005; 38:597-603. [PMID: 16104972 DOI: 10.1111/j.1365-2591.2005.00986.x] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
AIM To investigate the stress distribution pattern in the periapical region caused by biting forces and to study the role of cyclic biting loads on periapical fluid movement. METHODOLOGY In the first part, a digital photoelastic experiment was conducted to study stress distribution in the periapical region. In the second, 20 maxillary central incisors were selected and divided into three main groups: normal intact teeth (group 1), tooth specimens in which the root canal was enlarged and maintained wet (group 2), and tooth specimens in which the root canal was enlarged and maintained dry (group 3). The tooth specimens were placed in a polycarbonate support with a cavity filled with a sponge soaked in methylene blue solution to simulate a periapical defect with exudate. During testing, the specimens were placed in a water bath at 37 degrees C, and were loaded cyclically with a load of 20 N, at a rate of 72 cycles min(-1), to a maximum of 20,000 cycles. The specimens were then sectioned and evaluated for retrograde fluid movement using light microscopy. The data were analysed using one-way anova (post hoc tests). RESULTS Digital photoelastic experiments showed that the compression of teeth produced bending stresses in the periapical region. Testing with cyclic loads demonstrated retrograde fluid movement into the apical portion of the root canal and extraradicular region in all groups. There was a significant difference amongst the apical retrograde fluid movement displayed by different groups (<0.01). Group 2, in which the root canal was enlarged and maintained wet showed maximum retrograde fluid movement, whilst group 3, in which the root canal was enlarged and maintained dry showed the least retrograde fluid movement. CONCLUSIONS Biting forces would cause bending of the periapical bone and cyclic biting forces would contribute to retrograde fluid movement into the root canal space and extraradicular region.
Collapse
Affiliation(s)
- A Kishen
- Department of Restorative Dentistry, Faculty of Dentistry, National University of Singapore, Singapore.
| |
Collapse
|
18
|
Goto Y, Nicholls JI, Phillips KM, Junge T. Fatigue resistance of endodontically treated teeth restored with three dowel-and-core systems. J Prosthet Dent 2005; 93:45-50. [PMID: 15623997 DOI: 10.1016/j.prosdent.2004.09.026] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
STATEMENT OF PROBLEM The successful restoration of endodontically treated teeth is enhanced by a crown design employing the ferrule effect. However, it is unclear which dowel-and-core system most effectively supports successful treatment. PURPOSE The purpose of this study was to compare the load fatigue resistance of 3 dowel-and-core systems. MATERIAL AND METHODS Fifteen endodontically treated maxillary central incisors were sectioned perpendicular to the long axis at a point 1.5 mm incisal to the cemento-enamel junction (CEJ). At the level of the CEJ, specimens were then prepared for crowns with 1-mm complete shoulder finish lines and 1.5 mm of axial wall height. The prepared teeth were divided into 3 groups (n=5) and restored with 1 of the following dowel-and-core combinations: Group CG, cast gold dowels and cores; Group TA, titanium alloy dowels (ParaPost XH) with composite cores; or Group FR, fiber-reinforced resin dowels (ParaPost FiberWhite) with composite cores. A dentin bonding agent (OptiBond Solo) was placed prior to the composite cores. Dowel-and-core castings and titanium alloy dowels were cemented with zinc phosphate cement. The fiber-reinforced dowels were cemented with a resin cement (ParaPost Cement). The crowns for all specimens were cast with an incisal notch for applying the fatigue load. The independent variable measured was the number of load fatigue cycles required to cause luting cement failure. The data were subjected to 1-way analysis of variance and the Student-Newman-Keuls test for 3 subsets (alpha=.05). RESULTS The mean value+/-standard deviation for the cycles to failure for each group was: Group CG: 11,897+/-4080 load cycles, Group TA: 24,384+/-8231 load cycles, and Group FR: 50,696+/-7063 load cycles. Significant differences were found between all groups ( P<.05). CONCLUSIONS Fiber-reinforced resin dowels and bonded composite cores under fatigue loading provided significantly stronger crown retention than cast gold dowels and cores and titanium alloy dowels with composite cores under fatigue loading.
Collapse
|
19
|
de Souza Filho CB, Paulino SM, Alfredo E, de Sousa Neto MD, Vansan LP. Effect of the diameter on Cu-Al post retention. Braz Oral Res 2004; 18:238-41. [PMID: 15619878 DOI: 10.1590/s1806-83242004000300011] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
This study compared the resistance to removal by traction of abraded cylindrical metal cast posts of Cu-Al (Goldent-LA). The posts had constant length (9 mm) and three different diameters (0.9, 1.3 and 1.7 mm), and were cemented with zinc phosphate cement. The crowns of 36 sound maxillary canines were sectioned, the roots were immersed in resin blocks and the root canals were endodontically treated. The teeth were divided into three groups to be prepared and standardized with the use of a parallelometer with the following burs: Group 1 - Largo n. 2; Group 2 - Largo n. 4; Group 3 - Largo n. 6. The posts were molded with chemically activated resin and after casting they were abraded and their dimensions were confirmed with a digital caliper. After cementation of the posts in the prepared root canals, the samples were kept at 37ºC in distilled water for 7 days and subsequently submitted to the traction test in a universal testing machine (Instron 4444). The results showed no statistical difference between the groups. Diameter variation (0.9 mm, 1.3 mm and 1.7 mm) in abraded cylindrical posts cemented with zinc phosphate did not affect resistance to removal.
Collapse
|
20
|
Akkayan B. An in vitro study evaluating the effect of ferrule length on fracture resistance of endodontically treated teeth restored with fiber-reinforced and zirconia dowel systems. J Prosthet Dent 2004; 92:155-62. [PMID: 15295325 DOI: 10.1016/j.prosdent.2004.04.027] [Citation(s) in RCA: 97] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
STATEMENT OF PROBLEM There are few published studies analyzing the effects of different ferrule lengths of endodontically treated teeth in relationship to newly developed fiber-reinforced and zirconia dowel systems. PURPOSE This in vitro study compared the effect of 3 different ferrule lengths on the fracture resistance and fracture patterns of crowned endodontically treated teeth restored with 4 different esthetic dowel systems. MATERIAL AND METHODS The crowns of 123 human maxillary canines were removed at the cementoenamel junction and the roots were endodontically treated. Three master tooth models were prepared to ferrule lengths of 1.0 mm, 1.5 mm, and 2.0 mm to produce 3 master analogs. Each root was embedded in autopolymerizing resin with a 0.2-mm layer of silicone impression material to simulate the periodontal ligament. Forty analogs of each master tooth, with ferrule lengths of 1.0 mm, 1.5 mm, and 2.0 mm were produced with copy-milling (Celay system). Each group was further subdivided into 4 groups of 10 specimens each and restored with 4 different esthetic dowel systems (quartz fiber, glass fiber, glass fiber plus zirconia, and zirconia). All dowels were luted with adhesive resin cement (RelyX ARC), restored with composite cores (Valux Plus), and Ni-Cr alloy (Wiron 99) complete crowns. All specimens were loaded at 130 degrees to the long axes in a universal testing machine at a crosshead speed of 1 mm/min until fracture. Fracture patterns were classified as failures above or below the incisal third of the roots. The data were analyzed with 2-way ANOVA and Tukey HSD tests (alpha=.05). A Fisher exact test was conducted for evaluation of the mode of failure (alpha=.05). RESULTS Mean failure loads (kg) for quartz fiber, glass fiber, glass fiber plus zirconia, and zirconia groups, respectively, with the 3 ferrule lengths were: 1.0-mm ferrule specimens: 98.09 +/- 2.90, 85.36 +/- 2.82, 80.24 +/- 1.88, 70.11 +/- 2.48; 1.5-mm ferrule specimens: 101.0 +/- 2.88, 87.58 +/- 2.83, 89.8 +/- 2.09, 82.71 +/- 2.14; 2.0-mm ferrule specimens: 119.5+/-1.78, 99.84+/-1.23, 98.6 +/- 1.64, 95.42 +/- 1.02. Teeth prepared with 2.0-mm ferrules demonstrated significantly higher fracture thresholds (P<.001). There were no significant differences in fracture patterns. CONCLUSION Increasing the ferrule length of the endodontically treated teeth from 1 mm to 1.5 mm in specimens restored with quartz-fiber and glass-fiber dowels did not produce significant increases in the failure loads (P=.084, P=.119, respectively). No significant difference was detected between glass-fiber and glass-fiber plus zirconia dowels with 1.5-mm and 2.0-mm ferrules (P=.218, P=.244, respectively). However, fracture thresholds were higher for all 4 dowel systems when the specimens were prepared with a 2.0-mm ferrule length (P<.001).
Collapse
Affiliation(s)
- Begüm Akkayan
- Department of Prosthetic Dentistry, Faculty of Dentistry, Istanbul University, Turkey.
| |
Collapse
|
21
|
Abstract
The restoration of endodontically treated teeth is a topic that is extensively studied and yet remains controversial from many perspectives. This article reviews the major pertinent literature on this topic, with an emphasis on major decision-making elements in post placement and restoration of endodontically treated teeth. Recommendations are made for treatment planning, materials, and clinical practices from restorative and endodontic perspectives.
Collapse
Affiliation(s)
- Richard S Schwartz
- Graduate Endodontics and Department of General Dentistry, University of Texas Health Science Center at San Antonio, San Antonio, TX, USA.
| | | |
Collapse
|
22
|
Kishen A, Kumar GV, Chen NN. Stress-strain response in human dentine: rethinking fracture predilection in postcore restored teeth. Dent Traumatol 2004; 20:90-100. [PMID: 15025691 DOI: 10.1111/j.1600-4469.2004.00250.x] [Citation(s) in RCA: 68] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
In this study, the biomechanical perspective of fracture predilection in post-core restored teeth is investigated using computational, experimental, and fractographic analyses. The computational finite element analysis and the experimental tensile testing are used to evaluate the stress-strain response in structural dentine. The fractographic evaluations are conducted using laser scanning confocal microscopy and scanning electron microscopy to examine the topography of dentine from experimentally fractured specimens, and clinically fractured post-core restored teeth specimens. These experiments aided in correlating the stress-strain response in structural dentine with cracks and catastrophic fractures in post-core restored teeth. It was observed from these experiments that the inner dentine displayed distinctly high strains (deformations), while the outer dentine demonstrated high stresses during tensile loading. This implies that the energy fed into the material as it is extended will be spread throughout the inner dentine, and there is less possibility of local increase in stress at the outer dentine, which can lead to the failure of dentine structure. During post-endodontic restoration with increase in loss of inner dentine, the fracture resistance factor contributed by the inner dentine is compromised, and this in turn predisposes the tooth to catastrophic fracture.
Collapse
Affiliation(s)
- Anil Kishen
- Department of Restorative Dentistry, Faculty of Dentistry, National University of Singapore, Singapore 119074.
| | | | | |
Collapse
|
23
|
Abstract
Endodontically treated teeth have lost substantial tooth structure as a result of previous restorations, dental caries, and the access preparation for the endodontic therapy. The topic of restoring these teeth is complex and controversial, and their long-term prognosis is directly connected to the quality of the final restoration. This article describes contemporary knowledge of the biomechanical principles related to the restoration of pulpless teeth and provides a critical review of currently available materials and methods.
Collapse
Affiliation(s)
- Steven M Morgano
- Department of Restorative Sciences and Biomaterials, Boston University Goldman School of Dental Medicine, MA 02118-2392, USA.
| | | | | |
Collapse
|
24
|
Abstract
Diagnosis and treatment of chronic apical periodontitis associated with an abutment tooth in an extensive tooth-implant-supported fixed prosthesis is reported. Careful, complete interpretation of clinical data was imperative because the periapical radiolucency presented around the apex of a vital tooth. A retrograde endodontic approach was used to prevent an adverse outcome to the complex rehabilitative treatment that had been performed over many years.
Collapse
Affiliation(s)
- David R Steiner
- Department of Endodontics, School of Dentistry, University of Washington, Seattle, USA
| |
Collapse
|
25
|
Abstract
LITERATURE REVIEW A ferrule is a metal ring or cap used to strengthen the end of a stick or tube. It has been proposed that the use of a ferrule as part of the core or artificial crown may be of benefit in reinforcing root-filled teeth. A review of the literature investigating this effect is presented. The literature demonstrates that a ferrule effect occurs owing to the artificial crown bracing against the dentine extending coronal to the crown margin. Overall, it can be concluded that a ferrule is desirable, but should not be provided at the expense of the remaining tooth/root structure.
Collapse
|
26
|
Medina Tirado JI, Nagy WW, Dhuru VB, Ziebert AJ. The effect of thermocycling on the fracture toughness and hardness of core buildup materials. J Prosthet Dent 2001; 86:474-80. [PMID: 11725275 DOI: 10.1067/mpr.2001.120110] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
STATEMENT OF PROBLEM Thermocycling has been shown to cause surface degradation of many dental materials, but its effect on the fracture toughness and hardness of direct core buildup materials is unknown. PURPOSE This study was designed to determine the effect of thermocycling on the fracture toughness and hardness of 5 core buildup materials. MATERIAL AND METHODS Fifteen specimens were prepared from each of the following materials: Fluorocore, VariGlass VLC, Valiant PhD, Vitremer, and Chelon-Silver. American Standard for Testing Materials guidelines for single-edge notch, bar-shaped specimens were used. Ten specimens of each material were thermocycled for 2000 cycles; the other 5 specimens were not thermocycled. All specimens were subjected to 3-point bending in a universal testing machine. The load at fracture was recorded, and the fracture toughness (K(IC)) was calculated. Barcol hardness values were also determined. Data were analyzed with 1-way analysis of variance and compared with the Tukey multiple range test (P<.05). Pearson's correlation coefficient was also calculated to measure the association between fracture toughness and hardness. RESULTS Fluorocore had the highest thermocycled mean K(IC) and Valiant PhD the highest non-thermocycled K(IC). Chelon-Silver demonstrated the lowest mean K(IC) both before and after thermocycling. One-way analysis of variance demonstrated significant differences between conditions, and the Tukey test showed significant differences (P<.05) between materials for both conditions. Most specimens also showed significant hardness differences between conditions. Pearson's correlation coefficient indicated only a mild-to-moderate correlation between hardness and fracture toughness. CONCLUSION Within the limitations of this study, the thermocycling process negatively affected the fracture toughness and hardness of the core buildup materials tested.
Collapse
Affiliation(s)
- J I Medina Tirado
- School of Dentistry, Marquette University, Milwaukee, WI 53201-6516, USA
| | | | | | | |
Collapse
|
27
|
Cohen BI, Penugonda B, Pagnillo MK, Schulman A, Hittelman E. Torsional resistance of crowns cemented to composite cores involving three stainless steel endodontic post designs. J Prosthet Dent 2000; 84:38-42. [PMID: 10898840 DOI: 10.1067/mpr.2000.107915] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
STATEMENT OF PROBLEM There are no studies analyzing the effects of a crown in relationship to torsional resistance for a titanium-reinforced core material supported by a post. PURPOSE This study investigated the effects of post design on the torsional resistance of a crown supported by a titanium-reinforced composite core material (Ti-Core) and 3 endodontic posts (AccessPost, Flexi-Post, and ParaPost). MATERIAL AND METHOD Three groups of 10 specimens per group were studied. A total of 30 recently extracted human single-rooted (incisors) teeth with their crowns removed were used. Post holes preparations were created according to manufacturer's instructions. All posts were cemented using Flexi-Flow with titanium cement. Scotchbond Multi-Purpose bonding system was used as the bonding system for all groups. All cores were fabricated with Ti-Core with titanium core material with hard copper bands as the matrix. The Ti-Core core material was allowed to set for 1 hour. Metal crowns were fabricated and cemented with zinc phosphate cement. Specimens were placed in a special jig and a clockwise torsional force was applied. Torsional force was measured on a Lebow 1102-200 torque transducer and recorded on a Hewlett Packard 7015B X-Y recorder in inch x ounce. A 1-way analysis of variance (ANOVA) was used to test for statistical significance (P < .001). RESULTS The torsional values (inch x ounce) were AccessPost 77.2 +/- 30.3, Flexi-Post 162.2 +/- 51.2, and ParaPost 60.9 +/- 28.4. SNK and Scheffé comparison tests revealed that the Flexi-Post group had significantly greater resistance to torque loading than the AccessPost and ParaPost groups, which were statistically similar to each other. CONCLUSION Post design has an effect on torsional resistance of a crown supported by titanium-reinforced core build-up and post. The threaded split-shank design of the Flexi-Post dowel offers significantly greater resistance to torsional loading than the passive posts studied.
Collapse
Affiliation(s)
- B I Cohen
- Essential Dental Laboratories, South Hackensack, N.J., USA.
| | | | | | | | | |
Collapse
|
28
|
Morgano SM, Brackett SE. Foundation restorations in fixed prosthodontics: current knowledge and future needs. J Prosthet Dent 1999; 82:643-57. [PMID: 10588800 DOI: 10.1016/s0022-3913(99)70005-3] [Citation(s) in RCA: 118] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
PURPOSE The Ad Hoc Committee on Research in Fixed Prosthodontics established by the Academy of Fixed Prosthodontics publishes a yearly comprehensive literature review on a selected topic. The subject for this year is foundation restorations. METHODS Literature of various in vitro and in vivo investigations that included technical and clinical articles was reviewed to provide clinical guidelines for the dentist when selecting methods and materials for restoration of structurally compromised teeth. Topics discussed and critically reviewed include: (1) desirable features of foundation restorations, (2) foundations for pulpless teeth, (3) historic perspectives, (4) cast posts and cores, (5) role of the ferrule effect, (6) prefabricated posts, (7) direct cores, (8) foundation restorations for severely compromised teeth, (9) problems and limitations, (10) future needs, and (11) directions for future research. CONCLUSION This comprehensive review brings together literature from a variety of in vitro and in vivo studies, along with technique articles and clinical reports to provide meaningful guidelines for the dentist when selecting methods and materials for the restoration of structurally compromised teeth.
Collapse
Affiliation(s)
- S M Morgano
- Faculty of Dentistry, Kuwait University, Safat, Kuwait.
| | | |
Collapse
|
29
|
Cohen BI, Pagnillo MK, Newman I, Musikant BL, Deutsch AS. Effects of three bonding systems on the torsional resistance of titanium-reinforced composite cores supported by two post designs. J Prosthet Dent 1999; 81:678-83. [PMID: 10347355 DOI: 10.1016/s0022-3913(99)70106-x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
STATEMENT OF PROBLEM There are no studies that have investigated the effects of bonding agents on the resistance to torque of a composite core supported by a prefabricated post. PURPOSE This study investigated the ability of bonding agents to resist rational forces applied to titanium-reinforced composite cores supported by 2 post designs. MATERIAL AND METHODS Two post designs (AccessPost and ParaPost dowels) with titanium-reinforced core material and 4 bonding conditions (AllBond-2, ScotchBond Multi-Purpose, Tenure A&B, and without a bonding agent) were studied. A total of 80 specimens in 8 experimental groups were prepared and subjected to clockwise torsional forces until failure. RESULTS Torsional values ranged from 53.31 in. x oz (ParaPost/ScotchBond Multi-Purpose) to 72.31 in. x oz (AccessPost/ScotchBond Multi-Purpose). Two-way of analysis of variance failed to demonstrate a significant difference among posts or type of bonding system. CONCLUSION The use of a multistep bonding agent had no significant effect on the torsional resistance of a core supported by a passive endodontic post.
Collapse
Affiliation(s)
- B I Cohen
- Essential Dental Laboratories, South Hackensack, NJ, USA
| | | | | | | | | |
Collapse
|