151
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Soejima H, Takemoto S, Hattori M, Yoshinari M, Kawada E, Oda Y. Effect of adhesive system on retention in posts comprising fiber post and core resin. Dent Mater J 2015; 32:659-66. [PMID: 23903651 DOI: 10.4012/dmj.2013-078] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The purpose of this study was to compare the retention of fiber-reinforced composite (FRC) posts luted with either conventional or self-adhesive resin cement. The FRC posts and core resin were built up in bovine teeth. The posts were luted with standard etch-andrinse cement, self-etch cement, or one of two self-adhesive cements. The samples were stored in water for 1 or 14 days or subjected to thermal cycling (TC). Retention value was measured with the pull-out test using a universal testing machine. Conventional adhesive resin cement yielded significantly greater retention than self-adhesive resin cement at 1 day. No significant difference was observed in retention among the adhesive systems tested at 14 days or after TC. During the early luting stage, self-adhesive resin cement yielded lower retention value than conventional resin cement. After 14 days storage or TC, retention was comparable to that with conventional resin cement.
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Affiliation(s)
- Hirotaka Soejima
- Department of Dental Materials Science, Tokyo Dental College, 1-2-2 Masago, Mihama-ku, Chiba 261-8502, Japan
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152
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Borges MG, Faria-e-Silva AL, Santos-Filho PCF, Silva FP, Martins LRM, Menezes MDS. Does the moment of fiber post cutting influence on the retention to root dentin? Braz Dent J 2015; 26:141-5. [PMID: 25831104 DOI: 10.1590/0103-6440201300242] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2014] [Accepted: 12/15/2014] [Indexed: 11/21/2022] Open
Abstract
Despite several advantages associated with pre-fabricated glass-fiber posts, the coronal portion of these posts must be cut to allow their use in various clinical situations. However, cutting the cemented post can generate stress on the bonding interface and affect the bond strength. The aim of this study was to investigate the effect the of fiber post cutting on the bond strength of root canals. Sixty bovine incisor roots were included in resin cylinders with simulated periodontal ligaments. Glass-fiber posts were luted using regular resin cement RelyX ARC (3M ESPE) or self-adhesive cement RelyX Unicem (3M ESPE). The posts were cut prior to cementation, immediately after luting or after building up the core (n=10). After storage for 24 h, the samples were cut and subject to push-out testing using a mechanical testing machine (EMIC DL 2000). Data were analyzed using two-way ANOVA (resin cement x moment of post cutting) and Tukey's post hoc test (α=0.05). The moment of fiber post cutting did not affect the bond strength when Unicem was used. However, the bond strength was reduced when ARC was used and when the post was cut immediately. In conclusion, the moment of fiber post cutting may affect the retention of root canal posts when a regular resin cement is used.
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Affiliation(s)
- Marcela G Borges
- Department of Operative Dentistry and Dental Materials, Dental School, UFU - Federal University of Uberlândia, Uberlândia, MG, Brazil
| | - André L Faria-e-Silva
- Department of Dentistry, School of Dentistry, UFS - Federal University of Sergipe, Aracaju, SE, Brazil
| | - Paulo C F Santos-Filho
- Department of Operative Dentistry and Dental Materials, Dental School, UFU - Federal University of Uberlândia, Uberlândia, MG, Brazil
| | - Fernanda P Silva
- Department of Operative Dentistry and Dental Materials, Dental School, UFU - Federal University of Uberlândia, Uberlândia, MG, Brazil
| | - Luís R M Martins
- Department of Restorative Dentistry, Piracicaba Dental School, UNICAMP - University of Campinas, Piracicaba, SP, Brazil
| | - Murilo de Sousa Menezes
- Department of Operative Dentistry and Dental Materials, Dental School, UFU - Federal University of Uberlândia, Uberlândia, MG, Brazil
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153
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Vital RDA, Ribeiro JS, Rocha SSD. Evaluation of the pattern dimensions of cast-metal posts in uniradicular teeth. REVISTA DE ODONTOLOGIA DA UNESP 2015. [DOI: 10.1590/1807-2577.1066] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Introduction Accurate dimensions of cast-metal posts are relevant to the survival of dental prostheses. Objective The aim of this study was to verify if the dimensions of cast-metal posts accord with ideal clinical criteria. Material and method For the evaluation, 285 periapical radiographs, from a total of 80 teeth, were taken from the charts of patients that attended the clinics at the Dental School of the Federal University of Goiás, from March 2008 to October 2012. Only periapical radiographs of single-rooted teeth with post and core were included in the study. The radiographic evaluation was conducted with the assistance of a magnifying glass and a view box, in a room with low luminosity. The dimensions of the post and core were established with the help of a digital caliper, and the following measurements were considered: a) LR (Length Remnant); b) LP (Length Post); c) BS (Bone Support); d) DR (Diameter Root); e) DP (mesiodistal diameter post). The post and core were classified as acceptable or deficient by reference values with a margin of error of 0.2 mm. For descriptive analysis, the data were cataloged using SPSS software (version 17.0). Result With regard to the length of the post and core, only 26.25% and 43.75% of the post and core were classified as acceptable according to the two-thirds rule and fulcrum dental rule, respectively. With regard to the mesiodistal diameter of the post and core, 55% were classified as acceptable. Conclusion Within the limits of this study, it can be concluded that the cast-metal posts evaluated do not accord with the ideal clinical criteria.
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154
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El-Damanhoury HM, Haj-Ali RN, Platt JA. Fracture resistance and microleakage of endocrowns utilizing three CAD-CAM blocks. Oper Dent 2015; 40:201-10. [PMID: 25268039 DOI: 10.2341/13-143-l] [Citation(s) in RCA: 87] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
This study assessed marginal leakage and fracture resistance of computer-aided design/computer-aided manufacturing (CAD/CAM) fabricated ceramic crowns with intracoronal extensions into the pulp chambers of endodontically treated teeth (endocrowns) using either feldspathic porcelain (CEREC Blocks [CB], Sirona Dental Systems GmbH, Bensheim, Germany), lithium disilicate (e.max [EX], Ivoclar Vivadent, Schaan, Liechtenstein), or resin nanoceramic (Lava Ultimate [LU], 3M ESPE, St Paul, MN, USA).). Thirty extracted human permanent maxillary molars were endodontically treated. Standardized preparations were done with 2-mm intracoronal extensions of the endocrowns into the pulp chamber. Teeth were divided into three groups (n=10); each group was restored with standardized CAD/CAM fabricated endocrowns using one of the three tested materials. After cementation with resin cement, specimens were stored in distilled water at 37°C for one week, subjected to thermocycling, and immersed in a 5% methylene-blue dye solution for 24 hours. A compressive load was applied at 35 degrees to long axis of the teeth using a universal testing machine until failure. Failure load was recorded, and specimens were examined under a stereomicroscope for modes of failure and microleakage. Results were analyzed using one-way analysis of variance and Bonferroni post hoc multiple comparison tests (α=0.05). LU showed significantly (p<0.05) higher fracture resistance and more favorable fracture mode (ie, fracture of the endocrown without fracture of tooth) as well as higher dye penetration than CB and EX. In conclusion, although using resin nanoceramic blocks for fabrication of endocrowns may result in better fracture resistance and a more favorable fracture mode than other investigated ceramic blocks, more microleakage may be expected with this material.
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155
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Juloski J, Goracci C, Tsintsadze N, Carrabba M, Vichi A, Vulicevic ZR, Ferrari M. Influence of luting agent translucency on fiber post retention. Eur J Oral Sci 2015; 123:116-21. [PMID: 25683864 DOI: 10.1111/eos.12174] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/19/2015] [Indexed: 11/28/2022]
Abstract
The aim was to assess the influence of cement translucency on the retentive strength of luted fiber posts. Twenty extracted human premolars were randomly divided into four equal groups, based on the combinations of materials to be tested. Two post types of the same size, shape, and chemical composition, but different light-transmission properties [Translucent post (TP) and Opaque post (OP)] were selected. The two post types were luted using the etch-and-rinse, light-curing adhesive in combination with two shades of the same resin cement of markedly different light-transmitting ability [Transparent shade (TS) and Opaque shade (OS)]. Early post retention was assessed using the thin-slice push-out test. Post type did not significantly influence post retention; however, cement translucency emerged as a relevant factor in intraradicular cementation, with the TS achieving higher push-out strengths. The between-factor interaction was also statistically significant; specifically, OP-OS yielded significantly lower retentive strengths than all the other groups. Post translucency did not influence post retention, provided that a highly translucent cement was utilized for luting.
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Affiliation(s)
- Jelena Juloski
- Department of Medical Biotechnologies, University of Siena, Siena, Italy; Clinic for Pediatric and Preventive Dentistry, School of Dentistry, University of Belgrade, Belgrade, Serbia
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156
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Liu M, Chen J, Hu X, Du Y, Xia Y, Gu N, Zhang F. Enhanced properties of fiberglass-reinforced photocurable resin pile by introducing different fiberglass surface treatments and their biological evolution. RSC Adv 2015. [DOI: 10.1039/c5ra08964f] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The properties of fiberglass-reinforced photocurable resin piles are enhanced by introducing different fiberglass surface treatments, which shows good cell compatibility.
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Affiliation(s)
- Mei Liu
- Jiangsu Key Laboratory of Oral Diseases
- Nanjing Medical University
- Nanjing 210029
- China
| | - Jianshan Chen
- Jiangsu Key Laboratory of Oral Diseases
- Nanjing Medical University
- Nanjing 210029
- China
| | - Xiaokun Hu
- Jiangsu Key Laboratory of Oral Diseases
- Nanjing Medical University
- Nanjing 210029
- China
| | - Yueming Du
- Jiangsu Key Laboratory of Oral Diseases
- Nanjing Medical University
- Nanjing 210029
- China
| | - Yang Xia
- Jiangsu Key Laboratory of Oral Diseases
- Nanjing Medical University
- Nanjing 210029
- China
| | - Ning Gu
- Suzhou Institute & Collaborative Innovation Center of Suzhou Nano Science and Technology
- Southeast University
- Suzhou 215000
- China
| | - Feimin Zhang
- Jiangsu Key Laboratory of Oral Diseases
- Nanjing Medical University
- Nanjing 210029
- China
- Suzhou Institute & Collaborative Innovation Center of Suzhou Nano Science and Technology
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157
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Fracture resistance of endodontically treated roots with oval canals restored with oval and circular posts. J Endod 2014; 41:539-43. [PMID: 25498127 DOI: 10.1016/j.joen.2014.11.009] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2014] [Revised: 11/01/2014] [Accepted: 11/08/2014] [Indexed: 11/22/2022]
Abstract
INTRODUCTION The aim of the present study was to evaluate the effects of post space preparations with circular and oval post drills and the placement of oval and circular posts on the fracture strength of roots with oval canals. METHODS Seventy mandibular premolars with oval root canals were decoronated. Fourteen teeth were used as a control group (group 1), and the root canals of the remaining teeth were prepared up to size #30. The root canals were filled, and the samples were randomly divided into 4 experimental groups as follows: post space preparation with circular-shaped drills (group 2), post space preparation with oval-shaped drills (group 3), circular post placement (group 4), and oval post placement (group 5). A fracture strength test was performed on each specimen, and the data were statistically evaluated using 1-way analysis of variance and Tukey post hoc tests. RESULTS The fracture strengths of the circular posts-placed group were higher than those of the oval post-placed group (P < .001). The post space preparation using oval-shaped drills significantly decreased the fracture strength of the roots compared with the control group (P < .001). CONCLUSIONS Within the limitations of the present study, oval posts did not provide a higher fracture resistance to endodontically treated roots with oval canals compared with circular posts. Therefore, clinicians should be aware that oval posts are similar to circular posts in terms of enhancing the fracture resistance of roots with oval canals.
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158
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Hu C, Wang F, Yang H, Ai J, Wang L, Jing D, Shao L, Zhou X. Preparation and characterisation of poly p-phenylene-2,6-benzobisoxazole fibre-reinforced resin matrix composite for endodontic post material: A preliminary study. J Dent 2014; 42:1560-8. [DOI: 10.1016/j.jdent.2014.10.007] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2014] [Revised: 10/06/2014] [Accepted: 10/15/2014] [Indexed: 11/28/2022] Open
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159
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Khoroushi M, Mazaheri H, Tarighi P, Samimi P, Khalighinejad N. Effect of antioxidants on push-out bond strength of hydrogen peroxide treated glass fiber posts bonded with two types of resin cement. Restor Dent Endod 2014; 39:303-9. [PMID: 25383350 PMCID: PMC4223101 DOI: 10.5395/rde.2014.39.4.303] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2014] [Accepted: 07/27/2014] [Indexed: 12/02/2022] Open
Abstract
Objectives Hydrogen peroxide (H2O2) surface treatment of fiber posts has been reported to increase bond strength of fiber posts to resin cements. However, residual oxygen radicals might jeopardize the bonding procedure. This study examined the effect of three antioxidant agents on the bond strength of fiber posts to conventional and self-adhesive resin cements. Materials and Methods Post spaces were prepared in forty human maxillary second premolars. Posts were divided into five groups of 8 each: G1 (control), no pre-treatment; G2, 10% H2O2 pre-treatment; G3, G4 and G5. After H2O2 application, Hesperidin (HES), Sodium Ascorbate (SA) or Rosmarinic acid (RA) was applied on each group respectively. In each group four posts were cemented with Duo-Link conventional resin cement and the others with self-adhesive BisCem cement. Push-out test was performed and data were analyzed using 2-way ANOVA and tukey's post-hoc test (α = 0.05). Results There was a statistically significant interaction between the cement type and post surface treatment on push-out bond strength of fiber posts (p < 0.001, F = 16). Also it was shown that different posts' surface treatments significantly affect the push-out bond strength of fiber posts (p = 0.001). H2O2 treated posts (G2) and control posts (G1) cemented with Duo-link showed the highest (15.96 ± 5.07MPa) and lowest bond strengths (6.79 ± 3.94) respectively. Conclusions It was concluded that H2O2 surface treatment might enhance the bond strength of fiber posts cemented with conventional resin cements. The effect of antioxidants as post's surface treatment agents depends on the characteristics of resin cements used for bonding procedure.
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Affiliation(s)
- Maryam Khoroushi
- Department of Operative Dentistry, School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran. ; Dental Materials Research Center, Isfahan University of Medical Science, Isfahan, Iran
| | - Hamid Mazaheri
- Dental Materials Research Center, Isfahan University of Medical Science, Isfahan, Iran
| | - Pardis Tarighi
- Department of Operative Dentistry, School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran. ; Department of Operative Dentistry and Torabinejad Dental Research Center, School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Pouran Samimi
- Department of Operative Dentistry, School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Navid Khalighinejad
- Dental Materials Research Center, Isfahan University of Medical Science, Isfahan, Iran
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160
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SARKIS-ONOFRE R, PEREIRA-CENCI T, OPDAM NJ, DEMARCO FF. Preference for using posts to restore endodontically treated teeth: findings from a survey with dentists. Braz Oral Res 2014; 29:1-6. [DOI: 10.1590/1807-3107bor-2015.vol29.0001] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2014] [Accepted: 08/02/2014] [Indexed: 11/21/2022] Open
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161
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Santos-Filho PCF, Veríssimo C, Raposo LHA, Noritomi, MecEng PY, Marcondes Martins LR. Influence of Ferrule, Post System, and Length on Stress Distribution of Weakened Root-filled Teeth. J Endod 2014; 40:1874-8. [DOI: 10.1016/j.joen.2014.07.015] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2014] [Revised: 06/23/2014] [Accepted: 07/09/2014] [Indexed: 11/27/2022]
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162
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Akin GE, Akin H, Sipahi C, Piskin B, Kirmali O. Evaluation of surface roughness and bond strength of quartz fiber posts after various pre-treatments. Acta Odontol Scand 2014; 72:1010-6. [PMID: 25139129 DOI: 10.3109/00016357.2014.939710] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
PURPOSE Debonding at the post-adhesive interface is a major problem for quartz fiber posts. The objective of this study was to evaluate surface roughness and bond strength of quartz fiber posts after various surface treatments. MATERIALS AND METHODS Sixty-six quartz fiber posts were randomly divided into six experimental groups (n = 11) including group C, untreated (control); group SB, sandblasted; group SC, silica coated; group HF, hydrofluoric acid-etched; group N, Nd:YAG laser irradiated; group E, Er:YAG laser irradiated. Surface roughness of the posts was measured before and after pre-treatment. They were then bonded to resin cement and tensile bond strength was determined in a universal testing machine. Furthermore, two-way ANOVA and post hoc comparison tests (α = 0.05) were performed on all data. RESULTS The highest mean force value was observed in group SB and followed by group E. Tukey's HSD test showed that there was no statistical difference between group SB and group E (p = 0.673). The highest mean roughness value was observed in group SB and a significant difference was found between group SB and all other groups (p < 0.001). This study reveals that sandblasting and Er:YAG laser irradiation provided a significant increase in bond strength between quartz fiber posts and resin cement. CONCLUSIONS Sandblasting or Er:YAG laser-irradiation of the surface of the quartz fiber post before cementation is recommended for increasing retention.
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163
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Sipahi C, Piskin B, Akin GE, Bektas OO, Akin H. Adhesion between glass fiber posts and resin cement: evaluation of bond strength after various pre-treatments. Acta Odontol Scand 2014; 72:509-15. [PMID: 24432787 DOI: 10.3109/00016357.2013.875586] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
PURPOSE To evaluate surface roughness and bond strength of glass fiber posts to a resin cement after various surface treatments. MATERIALS AND METHODS Sixty individually formed glass fiber posts with a diameter of 1.5 mm and a length of 20 mm were used for this study. They were randomly assigned to six groups of pre-treatment (n = 10/group): Group C, untreated (control); Group SB, sandblasted; Group SC, silica coated; Group HF, hydrofluoric acid-etched; Group N, Nd:YAG laser irradiated; Group E, Er:YAG laser irradiated. Surface roughness of the posts was measured before and after pre-treatment. The posts were then bonded to resin cement and tensile bond strengths were determined in a universal testing machine. For statistical analysis, two-way ANOVA and post-hoc comparison tests (α = 0.05) were performed. RESULTS The highest bond strength value was observed in group HF, followed by group SC. There was a statistically significant difference in bond strength between group C and groups HF, SC and E (p < 0.001, p = 0.002 and p = 0.041, respectively). Posts of group SB and group N showed the highest surface roughness. CONCLUSIONS The findings of the present study reveal that hydrofluoric acid-etching, silica coating and Er:YAG laser irradiation provided a significant increase in bond strength between glass fiber posts and resin cement.
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Affiliation(s)
- Cumhur Sipahi
- Department of Prosthodontics, Gulhane Military Medical Academy , Ankara , Turkey
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164
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Yaman BC, Ozer F, Takeichi T, Karabucak B, Koray F, Blatz MB. Effect of thermomechanical aging on bond strength and interface morphology of glass fiber and zirconia posts bonded with a self-etch adhesive and a self-adhesive resin cement to natural teeth. J Prosthet Dent 2014; 112:455-64. [DOI: 10.1016/j.prosdent.2013.11.008] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2013] [Revised: 10/31/2013] [Accepted: 11/01/2013] [Indexed: 10/25/2022]
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165
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Mehra M, Vahidi F. Complete mouth implant rehabilitation with a zirconia ceramic system: A clinical report. J Prosthet Dent 2014; 112:1-4. [DOI: 10.1016/j.prosdent.2013.12.016] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2013] [Revised: 11/19/2013] [Accepted: 12/01/2013] [Indexed: 10/25/2022]
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166
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Uzunoğlu E, Türker SA, Yilmaz Z. Influence of cement type and thickness on polyfiber post adhesion. J Conserv Dent 2014; 17:255-60. [PMID: 24944450 PMCID: PMC4056398 DOI: 10.4103/0972-0707.131789] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2013] [Revised: 03/03/2014] [Accepted: 03/09/2014] [Indexed: 11/23/2022] Open
Abstract
Introduction: To evaluate the effect of two different post space diameters and related resin cement film thicknesses on the bond strength of a polyfiber post. Materials and Methods: A total of 48 premolars were randomly divided into two according to the post space diameter: 1.1 mm and 1.5 mm. Then each group was divided into three sub-groups according to luting cement used: RelyX U100, Panavia F2.0/ED primer, Clearfil SA cement. Spirapost was then luted into the canal using luting cements. Two slices were obtained from each root specimen. Push-out tests were performed. Data was analyzed with Kruskal-Wallis and Connover post-hoc and Mann-Whitney U-test (P < 0.05). Results: Push-out bond strength was found to vary significantly according to type of adhesive system and post space diameter size (P < 0.05). The self-adhesive resin cement RelyX U100 had significantly higher bond strengths compared with the other adhesive system (P < 0.05). The self-etch adhesive system (Panavia F2.0) showed significantly lower bond strengths compared with the other systems (P < 0.05). There was a significant interaction between the luting systems and post space diameter (P < 0.05). Conclusion: The increases in post space diameter significantly reduced the bond strength of Spirapost to root dentine for both groups.
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Affiliation(s)
- Emel Uzunoğlu
- Department of Endodontics, Faculty of Dentistry, Hacettepe University, Sihhiye 06100, Ankara, Turkey
| | | | - Zeliha Yilmaz
- Department of Endodontics, Faculty of Dentistry, Hacettepe University, Sihhiye 06100, Ankara, Turkey
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167
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Goracci C, Juloski J, Schiavetti R, Mainieri P, Giovannetti A, Vichi A, Ferrari M. The influence of cement filler load on the radiopacity of various fibre posts ex vivo. Int Endod J 2014; 48:60-7. [PMID: 24611944 DOI: 10.1111/iej.12275] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2013] [Accepted: 02/22/2014] [Indexed: 11/28/2022]
Abstract
AIM To verify whether the filler load of luting agents influences the radiopacity of intraradicularly placed posts. METHODOLOGY Digital radiographs of the following posts were taken: RelyX Fiber Post (3M ESPE), GC Fiber Post (GC Corporation), DT Light Post Illusion (RTD), DT Light SL Post (RTD), Endo-Composipost (RTD), FibreKleer Parallel Post (Jeneric Pentron Incorporated), FRC Postec (Ivoclar Vivadent), Parapost Taper Lux (Còltene/Whaledent AG), Radix Fiber Post (Dentsply Maillefer), EverStick Post (Stick Tech Ltd), Dentin Post X (Komet), Tech 21 X-op (Isasan), ENA Post (Micerium). Post radiopacity was measured in millimetres of aluminium (mmAl) with reference to an aluminium step wedge. Two extracted contralateral premolars were root filled. After post space preparation, taking the midpoint of the post hole as a reference, each tooth was cut longitudinally into two halves in a mesiodistal direction. On each half, the exposed root dentine was ground flat to the deepest point of the post space, and an even layer of cement was placed and light-cured. To obtain a clinically relevant layer of cement, the material thickness was reduced to 75 μm by grinding with wet abrasive paper. A cement formulation with 30 wt% of filler was tested in one premolar, whilst a formulation with 70 wt% of filler was utilized in the contralateral tooth. Posts were then placed between the two facing root halves of each premolar, and radiopacity was measured in mmAl. Data were analysed using t-test for paired samples (P < 0.05). RESULTS Radiopacity of posts ranged between 1.44 (ENA Post) and 5.78 mmAl (FibreKleer). In the presence of the more heavily filled cement, significantly higher values of post radiopacity were measured (P < 0.001). CONCLUSION The radiopacity of the luting agent contributed to the overall post radiovisibility within the root. Even when the cement with lower filler content was used in combination with the least radiodense dowels, the post was detectable within the root.
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Affiliation(s)
- C Goracci
- Department of Medical Biotechnologies, University of Siena, Siena, Italy
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168
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Durmuş G, Oyar P. Effects of post core materials on stress distribution in the restoration of mandibular second premolars: a finite element analysis. J Prosthet Dent 2014; 112:547-54. [PMID: 24630398 DOI: 10.1016/j.prosdent.2013.12.006] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2013] [Revised: 12/13/2013] [Accepted: 12/24/2013] [Indexed: 10/25/2022]
Abstract
STATEMENT OF PROBLEM Previous studies have not resolved the question as to which post and core combination optimizes the stress distribution within the post restoration and tooth. PURPOSE The purpose of this study was to determine which post and core combination provides the most favorable stress distribution upon loading. MATERIAL AND METHODS Three-dimensional models of teeth were created with the Ansys program to simulate different materials used for post and cores (Ti, NiCr, AuPd, zirconia, zirconia post/composite resin core, glass fiber post/composite resin core, and carbon fiber post/composite resin core) and metal ceramic crowns (nickel chromium alloy [Group NiCr] and gold palladium alloy [Group AuPd]). A force of 400 N was applied to the occlusal surface, and von Mises equivalent stress values were calculated. RESULTS Carbon fiber post/composite resin core/metal ceramic crowns with NiCr alloy core had the highest stress values in the weakened root, tooth/post interface, and post. NiCr post/NiCr core/metal ceramic crowns with NiCr alloy core had the lowest stress values in the weakened root and post. The zirconia post and core had the lowest stress value in the tooth/post interface. CONCLUSIONS A post material with a high elastic modulus led to lower stress in the weakened root (approximately 6%) and tooth/post interface (approximately 12%) and to higher stress in the post (approximately 5 times). A composite resin core led to higher stress in the weakened root (approximately 11% to 17%) and lower deformation in the tooth/post interface (approximately 17.5%) and post materials (approximately 24%). Group AuPd resulted in lower stress in the root and high stress in the post (approximately 4.5% to 7%) and affected the amount of deformation in posts with a composite resin core.
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Affiliation(s)
- Gökhan Durmuş
- Assistant Profesor, Department of Construction, Gazi University Technology Faculty, Ankara, Turkey
| | - Perihan Oyar
- Assistant Professor, Dental Prosthetics Technology, School of Health Services, Hacettepe University, Ankara, Turkey.
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169
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Effect of the crown, post, and remaining coronal dentin on the biomechanical behavior of endodontically treated maxillary central incisors. J Prosthet Dent 2014; 111:234-46. [DOI: 10.1016/j.prosdent.2013.07.006] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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170
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Cauwels RGEC, Lassila LVJ, Martens LC, Vallittu PK, Verbeeck RMH. Fracture resistance of endodontically restored, weakened incisors. Dent Traumatol 2014; 30:348-355. [PMID: 24571403 DOI: 10.1111/edt.12103] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/25/2014] [Indexed: 12/29/2022]
Abstract
OBJECTIVES To test the fracture strength of weakened bovine incisors endodontically treated with mineral trioxide aggregate (MTA), calcium phosphate bone cement (CPBC) or fibre reinforced composite (FRC) posts, and to evaluate the fracture mode. METHODS Weakened bovine incisors (n = 75), standardized according to the dentinal wall thickness at the cervical area, were randomly assigned to one control group and three experimental groups. Unfilled teeth were assigned to group 1 (n = 20) and served as control group. Group 2 (n = 17) consisted of teeth filled with MTA. In group 3 (n = 18), the incisors were filled with CPBC and in group 4 (n = 20) with FRC posts. All specimens were subjected to load at a cross-head speed of 60 mm min(-1) until fracture occurred. The initial (IL) and final fracture (FL) loads (N) were recorded, and the failure mode among the different groups was evaluated. RESULTS anova showed a statistically significant difference in fracture load among the groups. Tukey's test revealed a significant difference for the IL between the control group and the experimental groups with exception of the MTA group. The FL was not significantly different among the experimental groups. A high percentage of favourable fractures was seen in the FRC and CPBC groups. CONCLUSION FRC posts and CPBC could be promising materials to strengthen non-vital structurally compromised teeth.
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Affiliation(s)
- Rita G E C Cauwels
- Department of Paediatric Dentistry and Special Care - Paecomedis Research Group Research, Ghent University, Ghent, Belgium
| | - Lippo V J Lassila
- Department of Biomaterials Science and Turku Clinical Biomaterials Centre - TCBC, Institute of Dentistry, University of Turku, Turku, Finland
| | - Luc C Martens
- Department of Paediatric Dentistry and Special Care - Paecomedis Research Group Research, Ghent University, Ghent, Belgium
| | - Pekka K Vallittu
- Department of Biomaterials Science and Turku Clinical Biomaterials Centre - TCBC, Institute of Dentistry, University of Turku, Turku, Finland
| | - Ronald M H Verbeeck
- Department of Basic Medical Science-Biomaterials Group, Ghent University, Ghent, Belgium
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171
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Ekambaram M, Yiu CKY, Matinlinna JP, Chang JWW, Tay FR, King NM. Effect of chlorhexidine and ethanol-wet bonding with a hydrophobic adhesive to intraradicular dentine. J Dent 2014; 42:872-82. [PMID: 24561042 DOI: 10.1016/j.jdent.2014.02.006] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2013] [Revised: 01/25/2014] [Accepted: 02/11/2014] [Indexed: 11/18/2022] Open
Abstract
PURPOSE To evaluate the effect of adjunctive application of ethanol-wet bonding and chlorhexidine (CHX) with a hydrophobic adhesive on bond durability of fibre posts to intraradicular dentine. METHODS Ninety-six extracted human teeth with a single root and root canal were prepared for post placement after endodontic treatment. The teeth were randomly divided into four groups (n=24) after etching and rinsing for rewetting: Group 1: water-wet bonding, Group 2: water-wet bonding with CHX, Group 3: ethanol-wet bonding and Group 4: ethanol-wet bonding with CHX. Teeth in Groups 1 and 2 were treated with either distilled water or distilled water with 2% CHX for 60 s; while teeth in Groups 3 and 4 were treated with either 100% ethanol or 100% ethanol with 2% CHX. Two coats of primer, followed by neat resin were applied and light-cured for 40 s. Fibre posts were luted to bonded root dentine using dual-cure resin cement. Bonded roots were subjected to push-out bond strength testing and interfacial nanoleakage evaluation after 24 h, 6 and 12 months of storage. Data were analyzed using 3-way ANOVA (rewetting solutions, time and post space regions) and SNK tests. RESULTS Groups 3 and 4 showed significantly (p<0.05) higher bond strengths and lower nanoleakage than Groups 1 and 2 after 12 months of ageing. Addition of 2% chlorhexidine to ethanol-wet bonding with a hydrophobic adhesive did not further improve the bonding of a fibre post to intraradicular dentine, when compared to ethanol-wet bonding alone after 12 months of ageing. CLINICAL SIGNIFICANCE Ethanol-wet bonding with a hydrophobic adhesive alone could improve the bond durability of fibre post to intraradicular dentine and therefore would increase the success rate of post and core restorations of endodontically treated teeth.
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Affiliation(s)
- Manikandan Ekambaram
- Paediatric Dentistry and Orthodontics, Faculty of Dentistry, The University of Hong Kong, Prince Philip Dental Hospital, 34 Hospital Road, Hong Kong Special Administrative Region
| | - Cynthia Kar Yung Yiu
- Paediatric Dentistry and Orthodontics, Faculty of Dentistry, The University of Hong Kong, Prince Philip Dental Hospital, 34 Hospital Road, Hong Kong Special Administrative Region.
| | - Jukka Pekka Matinlinna
- Dental Material Science, Faculty of Dentistry, The University of Hong Kong, Prince Philip Dental Hospital, 34 Hospital Road, Hong Kong Special Administrative Region
| | - Jeffrey Wen Wei Chang
- Comprehensive Dental Care, Faculty of Dentistry, The University of Hong Kong, Prince Philip Dental Hospital, 34 Hospital Road, Hong Kong Special Administrative Region
| | - Franklin Russell Tay
- Department of Endodontics, School of Dentistry, Georgia Regents University, Augusta, GA, USA
| | - Nigel Martyn King
- Paediatric Dentistry, School of Dentistry, University of Western Australia, Oral Health Centre of WA, Australia
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172
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Lamichhane A, Xu C, Zhang FQ. Dental fiber-post resin base material: a review. J Adv Prosthodont 2014; 6:60-5. [PMID: 24605208 PMCID: PMC3942529 DOI: 10.4047/jap.2014.6.1.60] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2013] [Revised: 12/30/2013] [Accepted: 01/13/2014] [Indexed: 11/08/2022] Open
Abstract
Teeth that have short clinical crown, which are not alone enough to support the definitive restoration can be best treated using the post and core system. The advantages of fiber post over conventional metallic post materials have led to its wide acceptance. In addition to that the combination of aesthetic and mechanical benefits of fiber post has provided it with a rise in the field of dentistry. Also the results obtained from some clinical trials have encouraged the clinicians to use the fiber posts confidently. Fiber posts are manufactured from pre-stretched fibers impregnated within a resin matrix. The fibers could that be of carbon, glass/silica, and quartz, whereas Epoxy and bis-GMA are the most widely used resin bases. But recently studies are also found to be going on for polyimide as possible material for the fiber post resin base as a substitute for the conventional materials.
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Affiliation(s)
- Aashwini Lamichhane
- Department of Prosthodontics, Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China. ; Shanghai Key Laboratory of Stomatology, Shanghai, China
| | - Chun Xu
- Department of Prosthodontics, Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China. ; Shanghai Key Laboratory of Stomatology, Shanghai, China
| | - Fu-Qiang Zhang
- Department of Prosthodontics, Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China. ; Shanghai Key Laboratory of Stomatology, Shanghai, China
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173
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Sarkis-Onofre R, Jacinto RDC, Boscato N, Cenci MS, Pereira-Cenci T. Cast metal vs. glass fibre posts: a randomized controlled trial with up to 3 years of follow up. J Dent 2014; 42:582-7. [PMID: 24530920 DOI: 10.1016/j.jdent.2014.02.003] [Citation(s) in RCA: 68] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2013] [Revised: 01/27/2014] [Accepted: 02/03/2014] [Indexed: 12/11/2022] Open
Abstract
OBJECTIVE This randomized controlled trial compared the survival of glass fibre and cast metal dental posts used to restore endodontically treated teeth with no remaining coronal wall. METHODS Fifty-four participants (45 women) and 72 teeth were evaluated during a follow-up period of up to 3 years. Teeth were randomly allocated to the glass-fibre and cast-metal post groups. All teeth were restored with single metal-ceramic crowns. Survival probabilities were analyzed using Kaplan-Meier statistics (p≤0.05). RESULTS The 3-year recall rate was 92.3% and the survival rates of glass fibre and cast metal posts were similar (97.1% and 91.9%, respectively; p=0.682). Four failures were observed: two glass fibre posts in a premolar and anterior tooth debonded, one glass fibre post in a premolar debonded in association with root fracture, and one root fracture occurred in a molar with a cast metal post. CONCLUSIONS Glass fibre and cast metal posts showed similar clinical performance in teeth with no remaining coronal wall after 3 years. CLINICAL SIGNIFICANCE Posts are used to restore most endodontically treated teeth with no remaining coronal wall. This randomized controlled trial, one of few to compare glass fibre and cast metal posts in such teeth, showed that post type did not significantly influence the survival of restorations. These results can help dentists respond to the important question of how best to rehabilitate endodontically treated teeth with no remaining coronal wall.
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Affiliation(s)
- Rafael Sarkis-Onofre
- Graduate Program in Dentistry, Federal University of Pelotas, Rua Gonçalves Chaves, 457, Pelotas, RS 96015-560, Brazil.
| | - Rogério de Castilho Jacinto
- Graduate Program in Dentistry, Federal University of Pelotas, Rua Gonçalves Chaves, 457, Pelotas, RS 96015-560, Brazil.
| | - Noéli Boscato
- Graduate Program in Dentistry, Federal University of Pelotas, Rua Gonçalves Chaves, 457, Pelotas, RS 96015-560, Brazil.
| | - Maximiliano Sérgio Cenci
- Graduate Program in Dentistry, Federal University of Pelotas, Rua Gonçalves Chaves, 457, Pelotas, RS 96015-560, Brazil.
| | - Tatiana Pereira-Cenci
- Graduate Program in Dentistry, Federal University of Pelotas, Rua Gonçalves Chaves, 457, Pelotas, RS 96015-560, Brazil.
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174
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Cuadros-Sanchez J, Szesz A, Hass V, Patzlaff RT, Reis A, Loguercio AD. Effects of sonic application of adhesive systems on bonding fiber posts to root canals. J Endod 2014; 40:1201-5. [PMID: 25069933 DOI: 10.1016/j.joen.2013.12.034] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2013] [Revised: 12/28/2013] [Accepted: 12/30/2013] [Indexed: 10/25/2022]
Abstract
INTRODUCTION Luting posts inside the root canal is still a challenge because of the difficulty of bonding adhesive materials in the apical third of roots. This study evaluated the effect of the application mode of 3 simplified etch-and-rinse adhesives on the push-out bond strength (PBS), nanoleakage (NL), and in situ degree of conversion (DC) of fiber posts in the root canal. METHODS The roots of human premolars were endodontically prepared and divided into 6 groups according to the combination of the main factors: adhesive (Ambar, FGM, Joinville, SC, Brazil; Adper Single Bond 2, 3MESPE, St Paul, MN; and XP Bond+self-cure activator, DeTrey Dentsply, Konstanz, Germany) and application mode (manual or sonic). The posts were cemented and the PBS tested at 0.5 mm/min. The NL was evaluated by scanning electron microscopy after the immersion of specimens in 50% silver nitrate. Micro-Raman spectroscopy was used to measure the in situ DC. Root third was also considered in the statistical evaluation. Data were analyzed by 3-way repeated measures analysis of variance and Tukey tests (5%). RESULTS Under sonic application, the PBS and the in situ DC increased, whereas NL decreased significantly for all groups in the middle and apical thirds (P < .05). CONCLUSIONS The application of simplified adhesives by sonic mode in the root canal is a feasible tool to increase the fiber post bond to root canals.
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Affiliation(s)
- Johanna Cuadros-Sanchez
- Department of Restorative Dentistry, School of Dentistry, State University of Ponta Grossa, Paraná, Brazil
| | - Anna Szesz
- Department of Restorative Dentistry, School of Dentistry, State University of Ponta Grossa, Paraná, Brazil
| | - Viviane Hass
- Department of Restorative Dentistry, School of Dentistry, State University of Ponta Grossa, Paraná, Brazil
| | - Rafael Tiago Patzlaff
- Department of Research and Development, Odeme Biotechnology, Joaçaba, Santa Catarina, Brazil
| | - Alessandra Reis
- Department of Restorative Dentistry, School of Dentistry, State University of Ponta Grossa, Paraná, Brazil
| | - Alessandro D Loguercio
- Department of Restorative Dentistry, School of Dentistry, State University of Ponta Grossa, Paraná, Brazil.
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175
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Amin RA, Mandour MH, Abd El-Ghany OS. Fracture strength and nanoleakage of weakened roots reconstructed using relined glass fiber-reinforced dowels combined with a novel prefabricated core system. J Prosthodont 2014; 23:484-94. [PMID: 24495157 DOI: 10.1111/jopr.12139] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/15/2013] [Indexed: 11/29/2022] Open
Abstract
PURPOSE The aim of this study was to evaluate fracture strength and nanoleakage of endodontically treated weakened teeth after being restored with relined glass fiber-reinforced dowels and two types of cores. MATERIALS AND METHODS Sixty sound human decoronated and endodontically treated teeth were embedded in epoxy resin blocks, then divided into three groups (n = 20) according to the method of root reconstruction. Group 1 (control): nonweakened roots were restored with glass fiber-reinforced dowels (UNIC); group 2: weakened roots restored with glass fiber-reinforced dowels relined with composite resin; group 3: weakened roots restored with glass fiber-reinforced dowels and a thick layer of luting cement. Dowels were cemented using Corposit, a dual-cured adhesive resin cement, then each group was assigned into two subgroups (n = 10) according to the type of core used; subgroup a: custom-made core using the same luting cement, subgroup b: prefabricated glass fiber-reinforced core (UNIC). Half the specimens of each subgroup were individually mounted at 45° angles and statically compressed until fracture at a 0.5 mm/min crosshead speed with a 5 kN load cell. The type of failure was assessed using a magnification lens. The other half of the specimens were removed from the block, placed in silver nitrate solution for 24 hours followed by photo developer for 8 hours, then examined using environmental scanning electron microscope/energy dispersive analytical X-ray for nanoleakage evaluation. Data were statistically analyzed. RESULTS The nonweakened group recorded the highest fracture strength values. The composite relined group showed significantly higher fracture strength values than the cement group. The prefabricated core yielded higher fracture strength values than the custom-made core. All groups showed a degree of nanoleakage, with higher scores recorded for the composite group. CONCLUSIONS The fracture resistance of wide root canals can be improved by using glass fiber-reinforced dowels relined with composite resin as an alternative to increasing the thickness of luting cement; however, the percentage nanoleakage would increase. On the other hand, the recently introduced prefabricated glass fiber-reinforced core can be considered a promising technique, but further investigations are necessary.
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Affiliation(s)
- Rania A Amin
- Lecturer, Department of Crown and Bridge, Faculty of Dental Medicine, Al-Azhar University, Girls' Branch, Cairo, Egypt
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176
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Niu E, Agustin M, Douglas RD. Color match of machinable lithium disilicate ceramics: Effects of cement color and thickness. J Prosthet Dent 2014; 111:42-50. [DOI: 10.1016/j.prosdent.2013.09.005] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
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177
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Influence of Ferrule, Post System, and Length on Biomechanical Behavior of Endodontically Treated Anterior Teeth. J Endod 2014; 40:119-23. [DOI: 10.1016/j.joen.2013.09.034] [Citation(s) in RCA: 65] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2013] [Revised: 08/28/2013] [Accepted: 09/14/2013] [Indexed: 11/18/2022]
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178
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Zamboni Quitero MF, Garone-Netto N, de Freitas PM, de Cerqueira Luz MAA. Effect of post translucency on bond strength of different resin luting agents to root dentin. J Prosthet Dent 2014; 111:35-41. [DOI: 10.1016/j.prosdent.2013.09.012] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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179
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Niu E, Agustin M, Douglas RD. Color match of machinable lithium disilicate ceramics: Effects of foundation restoration. J Prosthet Dent 2013; 110:501-9. [DOI: 10.1016/j.prosdent.2013.09.004] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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180
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Seyam RS, Mobarak EH. Reinforcement of teeth with simulated coronal fracture and immature weakened roots using resin composite cured by a modified layering technique. Oper Dent 2013; 39:E128-36. [PMID: 24237320 DOI: 10.2341/12-525l] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
OBJECTIVE The purpose of this study was to evaluate the strengthening effect of resin composite, cured by a modified layering protocol, for teeth with simulated coronal fracture and weakened immature roots. METHODS Fifty maxillary teeth were decoronated and their apices sectioned to standardize the length to 12 mm. Prepared teeth were equally distributed into five groups. Group 1VF root apices were flared with Pesso drills up to size 6. The roots were flared until a dentin thickness of only 1 ± 0.2 mm remained. Root ends were filled with mineral trioxide aggregate. The canals were backfilled with Vertise Flow following a modified layering protocol using two light-transmitting posts size 6 and 3. Next, a DT light post size 2 was cemented using the same material. Groups 2TS/MF and 3ED/PF were prepared and cured in the same way as group 1VF but filled with Clearfil Tri-S Bond/Majesty Flow and ED Primer II/Panavia F2.0 respectively. Group 4UF was similarly prepared but left unfilled (control). In group 5NW, roots were unflared but similarly filled as in group 3ED/PF. After 24 hours of storage, the fracture load was measured. The degree of cure for each tested material was indirectly measured using microhardness at different root levels (cervical, middle, and apical). Data were analyzed using one-way analysis of variance followed by Newman-Keuls post hoc test. RESULTS Fracture load results revealed that groups 1VF and 2TS/MF had no statistically significant difference from group 5NW (p>0.05). For each tested material, no significant difference was found among microhardness values at different root levels. CONCLUSION It may be possible to reinforce the teeth with coronal fracture and immature weakened roots to be comparable with unweakened ones when composite is applied and cured by the modified layering technique.
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181
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Arslan H, Yılmaz CB, Karatas E, Barutcigil C, Topcuoglu HS, Yeter KY. Efficacy of different treatments of root canal walls on the pull-out bond strength of the fiber posts. Lasers Med Sci 2013; 30:863-8. [DOI: 10.1007/s10103-013-1457-4] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2013] [Accepted: 10/02/2013] [Indexed: 11/28/2022]
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182
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Krastl G, Lorch H, Zitzmann NU, Addison O, Dietrich T, Weiger R. Do oval posts improve fracture resistance of teeth with oval root canals? Dent Traumatol 2013; 30:232-5. [DOI: 10.1111/edt.12060] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/29/2013] [Indexed: 11/30/2022]
Affiliation(s)
- Gabriel Krastl
- Department of Periodontology, Endodontology and Cariology; University of Basel; Basel Switzerland
- Department of Oral Surgery; School of Dentistry; University of Birmingham; Birmingham UK
- Biomaterials Unit; School of Dentistry; University of Birmingham; Birmingham UK
| | - Heiner Lorch
- Department of Conservative Dentistry; School of Dental Medicine; University of Tubingen; Tubingen Germany
| | - Nicola U. Zitzmann
- Department of Periodontology, Endodontology and Cariology; University of Basel; Basel Switzerland
| | - Owen Addison
- Biomaterials Unit; School of Dentistry; University of Birmingham; Birmingham UK
| | - Thomas Dietrich
- Department of Oral Surgery; School of Dentistry; University of Birmingham; Birmingham UK
- Department of Health Policy and Health Services Research; Boston University Goldman School of Dental Medicine; Boston MA USA
| | - Roland Weiger
- Department of Periodontology, Endodontology and Cariology; University of Basel; Basel Switzerland
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183
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Mobarak E, Seyam R. Interfacial Nanoleakage and Bonding of Self-Adhesive Systems Cured with a Modified-Layering Technique to Dentin of Weakened Roots. Oper Dent 2013; 38:E154-65. [DOI: 10.2341/12-103-l] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
SUMMARY
Objective
The purpose of the study was to evaluate the nanoleakage and bond strength of different self adhesive systems cured with a modified-layering technique (MLT) to dentin of weakened roots.
Methods
Twenty-one maxillary incisors were decoronated and then root canals were instrumented and obturated with the cold lateral compaction technique. Weakened roots were simulated by flaring root canals until only 1 mm dentin thickness remained. Teeth were distributed into three groups. The canals were backfilled with Vertise Flow (VF group), a self-adhering system, following a modified-layering technique using two light-transmitting posts, sizes 6 and 3. DT Light Post size 2 was cemented using the same material. Remaining roots were prepared and cured in the same way as the VF group. However, in the TS/MF group, Clearfil Tri-S Bond (TS) adhesive and Clearfil Majesty Flow (MF) composite were used, while in the ED/PF group, ED primer II (ED)/Panavia F2.0 (PF) were used. After one week of storage, each root was sectioned to obtain six slices (two slices from each root third: coronal, middle and apical) of 0.9 ± 0.1 mm thickness. Interfacial nanoleakage expression was analyzed using a field emission scanning electron microscope (FEG-SEM), and the micro push-out bond strength (μPOBS) was measured at different root regions. Modes of failure were also determined using SEM. Data were statistically analyzed using two-way analysis of variance with repeated measures and Tukey post hoc test (p≤0.05).
Results
With MLT, all adhesive systems showed nanoleakage. For μPOBS, there was a statistically significant effect for adhesive systems (p<0.001) but not for root region (p<0.64) or for their interaction (p=0.99). Tukey post hoc test revealed that the bond strength of the VF group was significantly higher than the TS/MF and ED/PF groups for all root regions.
Conclusion
All of the tested self-adhesive systems cured using MLT had slight nanoleakage and were not sensitive to root regional differences. Self-adhering systems had higher bond strength than self-etch adhesives.
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Affiliation(s)
- E Mobarak
- Enas Mobarak, EBM, associate professor, Restorative Dentistry, Cairo University, Cairo, Egypt
| | - R Seyam
- Reham Seyam, lecturer, Endodontic Department, Cairo University, Cairo, Egypt
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184
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Dejak B, Młotkowski A. The influence of ferrule effect and length of cast and FRC posts on the stresses in anterior teeth. Dent Mater 2013; 29:e227-37. [DOI: 10.1016/j.dental.2013.06.002] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2012] [Revised: 05/01/2013] [Accepted: 06/24/2013] [Indexed: 10/26/2022]
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185
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Wang SF, Yang TCK, Hsu YT, Lee SY, Yang JC. The Structure-Property-Processing Relationship for Sintered Yttria-Stabilized Zirconia (YSZ)/Alumina Bioceramics. BIOMEDICAL ENGINEERING: APPLICATIONS, BASIS AND COMMUNICATIONS 2013. [DOI: 10.4015/s1016237213500051] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
The objective of this research is to study the effects of alumina addition on the microstructure-mechanical property relationship and sintering behavior of yttria (3 mol%)-stabilized zirconia (YSZ) ceramics. Well-dispersed YSZ / Al 2 O 3 ceramics containing 10–40 wt.% Al 2 O 3 were prepared by solid state reaction method. The relative density, average grain size, lattice parameters, microhardness, and fracture toughness of YSZ / Al 2 O 3 ceramics system sintered in the temperature range of 1250~1500°C as a function of Al 2 O 3 content were investigated. Experimental results showed that the ceramics with high Al 2 O 3 content and low sintering temperature tended to reveal low bulk densities. But the Al 2 O 3 content dependence on relative density for YSZ / Al 2 O 3 ceramics becomed deminishing when increasing the sintering temperature. Dense ceramics with composition of (80/20) ( YSZ / Al 2 O 3) and sintered at temperature of 1400°C and 1450°C revealed the optimal Vickers hardness and fracture toughness properties. These ceramics with high Al 2 O 3 content tended to reveal small grain sizes. The high sintering temperature governs the slow grain growth and high hardness in materials indicating the good correlation between microstructure of fabricated dense and mechanical properties.
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Affiliation(s)
- Sea-Fue Wang
- Department of Materials and Mineral Resources Engineering, National Taipei University of Technology, Taipei, Taiwan
- Center for Teeth Bank and Dental Stem Cell Technology, Taipei Medical University, Taipei, Taiwan
| | - Thomas Chung-Kuang Yang
- Institute of Biotechnology, National Taipei University of Technology, Taipei, Taiwan
- Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, Taipei, Taiwan
| | - Ya-Ting Hsu
- Department of Materials and Mineral Resources Engineering, National Taipei University of Technology, Taipei, Taiwan
| | - Sheng-Yang Lee
- School of Dentistry, College of Oral Medicine, Taipei Medical University, Taipei, Taiwan
- Center for Teeth Bank and Dental Stem Cell Technology, Taipei Medical University, Taipei, Taiwan
| | - Jen-Chang Yang
- Center for Teeth Bank and Dental Stem Cell Technology, Taipei Medical University, Taipei, Taiwan
- Department of Dental Technology, Taipei Medical University, Taipei, Taiwan
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186
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Arslan H, Barutcigil C, Yılmaz CB, Ceyhanlı KT, Topcuoglu HS. Push-Out Bond Strength Between Composite Core Buildup and Fiber-Reinforced Posts After Different Surface Treatments. Photomed Laser Surg 2013; 31:328-33. [DOI: 10.1089/pho.2013.3478] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- Hakan Arslan
- Department of Endodontics, Faculty of Dentistry, Izmir Katip Celebi University, Izmir, Turkey
| | - Cagatay Barutcigil
- Department of Restorative Dentistry, Faculty of Dentistry, Akdeniz University Antalya, Turkey
| | - Cenk Burak Yılmaz
- Department of Prosthodontics, Faculty of Dentistry, Ataturk University, Erzurum, Turkey
| | - Kadir Tolga Ceyhanlı
- Department of Endodontics, Faculty of Dentistry, Karadeniz Technic University, Trabzon, Turkey
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187
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Santos Filho PCF, Soares PV, Reis BR, Verissimo C, Soares CJ. Effects of threaded post placement on strain and stress distribution of endodontically treated teeth. Braz Oral Res 2013; 27:305-10. [DOI: 10.1590/s1806-83242013000400003] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2013] [Accepted: 04/05/2013] [Indexed: 11/22/2022] Open
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188
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Kim HD, Lee JH, Ahn KM, Kim HS, Cha HS. Effect of silane activation on shear bond strength of fiber-reinforced composite post to resin cement. J Adv Prosthodont 2013; 5:104-9. [PMID: 23755334 PMCID: PMC3675281 DOI: 10.4047/jap.2013.5.2.104] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2012] [Revised: 04/25/2013] [Accepted: 04/27/2013] [Indexed: 11/08/2022] Open
Abstract
PURPOSE Among the surface treatment methods suggested to enhance the adhesion of resin cement to fiber-reinforced composite posts, conflicting results have been obtained with silanization. In this study, the effects of silanization, heat activation after silanization, on the bond strength between fiber-reinforced composite post and resin cement were determined. MATERIALS AND METHODS Six groups (n=7) were established to evaluate two types of fiber post (FRC Postec Plus, D.T. Light Post) and three surface treatments (no treatment; air drying; drying at 38℃). Every specimen were bonded with dual-curing resin cement (Variolink N) and stored in distilled water for 24 hours at 37℃. Shear-bond strength (MPa) between the fiber post and the resin cement were measured using universal testing device. The data were analyzed with 1-way ANOVA and by multiple comparisons according to Tukey's HSD (α=0.05). The effect of surface treatment, fiber post type, and the interactions between these two factors were analyzed using 2-way ANOVA and independent sample T-tests. RESULTS Silanization of the FRC Postec Plus significantly increased bond strength compared with the respective non-treated control, whereas no effect was determined for the D.T. Light Post. Heat drying the silane coupling agent on to the fiber-reinforced post did not significantly improve bond strength compared to air-syringe drying. CONCLUSION The bond strength between the fiber-reinforced post and the resin cement was significantly increased with silanization in regards to the FRC Postec Plus post. Bond strength was not significantly improved by heat activation of the silane coupling agent.
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Affiliation(s)
- Hyun-Dong Kim
- Division of Prosthodontics, Department of Dentistry, College of Medicine, University of Ulsan, Asan Medical Center, Seoul, Republic of Korea
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189
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Balkaya MC, Birdal IS. Effect of resin-based materials on fracture resistance of endodontically treated thin-walled teeth. J Prosthet Dent 2013; 109:296-303. [DOI: 10.1016/s0022-3913(13)60304-2] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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190
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Camilotti V, Ioris MD, Busato PDMR, Ueda JK, Mendonça MJ. Avaliação da influência da solução de irrigação na resistência adesiva de um cimento resinoso. REVISTA DE ODONTOLOGIA DA UNESP 2013. [DOI: 10.1590/s1807-25772013000200003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
INTRODUÇÃO: A contaminação do substrato dentinário pode interferir na qualidade de união entre materiais adesivos e o dente. OBJETIVO: Investigar a influência de diferentes soluções de irrigação na resistência de união de um cimento resinoso. MATERIAL E MÉTODO: Foram selecionadas 40 coroas dentais bovinas, divididas em quatro grupos: G0 = soro; G1 = clorexidina; G2 = EDTA; G3 = clorexidina 0,12%, após condicionamento ácido. Em seguida, foram confeccionados cilindros de cimento resinoso utilizando-se uma matriz de Tygon com diâmetro interno de 1 mm e 2 mm de altura. A fotoativação foi realizada por aparelho de luz LED com 900 mW/cm² por 40 segundos. Foram confeccionados quatro cilindros de cimento resinoso para cada coroa bovina, totalizando 40 corpos de prova de cimento resinoso para cada grupo avaliado. O teste de resistência adesiva por microcisalhamento foi realizado após 24 horas. Decorrido esse período, os cilindros de cimento resinoso foram testados em uma máquina universal de ensaios (EMIC). Os dados obtidos foram submetidos à análise estatística pelos testes ANOVA e Tukey (p = 0,001). RESULTADO: Não houve diferenças estatisticamente significativas entre os grupos estudados, com exceção para o G3, que apresentou de forma significativa os menores valores de resistência adesiva. CONCLUSÃO: As diferentes soluções irrigadoras utilizadas previamente ao condicionamento ácido na dentina não interferem na resistência de união por microcisalhamento.
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191
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A flood tide of systematic reviews on endodontic posts: methodological assessment using of R-AMSTAR. Clin Oral Investig 2013; 17:1287-94. [DOI: 10.1007/s00784-013-0945-z] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2012] [Accepted: 02/05/2013] [Indexed: 01/08/2023]
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192
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Romeed SA, Dunne SM. Stress analysis of different post-luting systems: a three-dimensional finite element analysis. Aust Dent J 2013; 58:82-8. [DOI: 10.1111/adj.12030] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2012] [Revised: 06/21/2012] [Accepted: 06/21/2012] [Indexed: 11/30/2022]
Affiliation(s)
- SA Romeed
- King's College London Dental Institute; Denmark Hill Campus; London; United Kingdom
| | - SM Dunne
- King's College London Dental Institute; Denmark Hill Campus; London; United Kingdom
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193
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Egilmez F, Ergun G, Cekic-Nagas I, Vallittu PK, Lassila LVJ. Influence of cement thickness on the bond strength of tooth-colored posts to root dentin after thermal cycling. Acta Odontol Scand 2013; 71:175-82. [PMID: 22299811 DOI: 10.3109/00016357.2011.654257] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
OBJECTIVE The purpose of this study was to evaluate the effect of different resin cement thickness on the push-out bond strength of different posts (CAD/CAM zirconia post (ZR post)) and an individually formed glass fiber reinforced composite post (IPN post) prior to and after thermal cycling (TC). METHODS Post spaces with a height of 9 mm and a diameter of 1.5 mm were drilled in 80 mandibular premolar teeth. Two groups (n = 40) were formed according to the posts used (IPN posts or ZR posts). Then the specimens were randomly assigned into two sub-groups according to the post diameter: (1) 1.5 mm in diameter and (2) 1.2 mm in diameter (n = 20/per group). All posts were luted with a self-adhesive luting agent according to the manufacturer's instructions by using endo tips. Half of the samples (n = 10) were submitted to thermal cycling (5000 cycles, 5-55 °C). Thereafter, four 2-mm thick horizontal sections were obtained and subjected to push-out test. Failure modes were assessed quantitatively and morphologically. The data were statistically analyzed with a three-way analysis of variance (ANOVA) (p < 0.05). Statistical differences in failure modes were investigated by chi-square tests at a significance level of p < 0.05. RESULT Push-out bond strengths were significantly influenced both by the post diameter and thermal cycling. Larger (1.5 mm) diameter post results were statistically higher than 1.2 mm results (p < 0.05). Moreover, TC significantly increased the bond strength results (p < 0.05). There was no significant difference between ZR and IPN posts (p = 0.219). CONCLUSION The bond strengths of ZR and IPN posts were significantly decreased when the resin cement layer was thick. In addition, thermal cycling drastically influenced bond strengths of the tested post materials. CLINICAL SIGNIFICANCE The fit between tooth-colored endodontic posts and post spaces should be as tight as possible.
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Affiliation(s)
- Ferhan Egilmez
- Department of Prosthodontics, Faculty of Dentistry, Gazi University, Ankara, Turkey.
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194
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Ferreira RI, Bahrami G, Isidor F, Wenzel A, Haiter-Neto F, Groppo FC. Detection of vertical root fractures by cone-beam computerized tomography in endodontically treated teeth with fiber-resin and titanium posts: an in vitro study. Oral Surg Oral Med Oral Pathol Oral Radiol 2013; 115:e49-57. [DOI: 10.1016/j.oooo.2012.06.012] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2012] [Revised: 06/13/2012] [Accepted: 06/18/2012] [Indexed: 10/27/2022]
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195
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Juloski J, Fadda GM, Radovic I, Chieffi N, Vulicevic ZR, Aragoneses JM, Ferrari M. Push-out bond strength of an experimental self-adhesive resin cement. Eur J Oral Sci 2012; 121:50-6. [PMID: 23331424 DOI: 10.1111/eos.12005] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/01/2012] [Indexed: 12/01/2022]
Abstract
The adhesion of fiber posts luted with simplified adhesive systems has been a matter of great interest over the past years. The aim of this study was to assess the post retentive potential of experimental self-adhesive resin cement (EXP) when used alone and in combination with a self-etch adhesive. Fiber posts were placed in endodontically treated teeth and divided into four groups (n = 6) according the luting material, as follows: group 1 (EXP alone); group 2 (EXP used with self-etch adhesive); group 3 (marketed dual-cured cement used with self-etch adhesive); and group 4 (marketed self-adhesive cement). The push-out test was used to assess the retentive strength of fiber posts (expressed in MPa), and specimens were analyzed under a stereomicroscope to determine failure mode. The adhesive interface between the cement and root canal dentin for each group was evaluated using scanning electron microscopy. The post retentive potential of group 1 (EXP) (7.48 ± 4.35 MPa) was comparable with that of marketed cements from group 4 (6.79 ± 3.68 MPa) and group 3 (8.77 ± 4.58 MPa). When EXP was used in combination with self-etch adhesive (group 2), significantly higher push-out bond-strength values were measured (15.87 ± 4.68 MPa) compared with the other groups.
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Affiliation(s)
- Jelena Juloski
- Department of Dental Materials and Fixed Prosthodontics of Siena, Tuscan School of Dental Medicine, University of Florence and Siena, Siena, Italy.
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196
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Ferrari M, Vichi A, Fadda G, Cagidiaco M, Tay F, Breschi L, Polimeni A, Goracci C. A Randomized Controlled Trial of Endodontically Treated and Restored Premolars. J Dent Res 2012; 91:72S-78S. [DOI: 10.1177/0022034512447949] [Citation(s) in RCA: 117] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
This in vivo study examined the contribution of remaining coronal dentin and placement of a prefabricated (LP) or customized fiber post (ES) to the six-year survival of endodontically treated premolars. A sample of 345 patients provided 6 groups of 60 premolars each in need of endodontic treatment. Groups were classified according to the number of remaining coronal walls before abutment build-up. Within each group, teeth were allocated to one of three subgroups: (A) no post retention; (B) LP; or (C) ES (N = 20). All teeth were protected with a crown. Cox regression analysis revealed that fiber post retention significantly improved tooth survival (p < 0.001). Failure risk was lower in teeth restored with prefabricated (p = 0.001) than with customized posts (p = 0.009). Teeth with one (p = 0.004), two (p < 0.001), and three coronal walls (p < 0.001) had significantly lower failure risks than those without ferrule. Similar failure risks existed for teeth without coronal walls, regardless of the presence/absence of ferrule (p = 0.151). Regardless of the restorative procedure, the preservation of at least one coronal wall significantly reduced failure risk ( ClinicalTrials.gov number CT01532947).
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Affiliation(s)
- M. Ferrari
- Department of Dental Materials and Fixed Prosthodontics of the University of Siena, Tuscan School of Dental Medicine, University of Firenze and Siena, Policlinico ‘Le Scotte’, viale Bracci, Siena 53100, Italy
| | - A. Vichi
- Department of Dental Materials and Fixed Prosthodontics of the University of Siena, Tuscan School of Dental Medicine, University of Firenze and Siena, Policlinico ‘Le Scotte’, viale Bracci, Siena 53100, Italy
| | - G.M. Fadda
- Department of Dental Materials and Fixed Prosthodontics of the University of Siena, Tuscan School of Dental Medicine, University of Firenze and Siena, Policlinico ‘Le Scotte’, viale Bracci, Siena 53100, Italy
| | - M.C. Cagidiaco
- Department of Dental Materials and Fixed Prosthodontics of the University of Siena, Tuscan School of Dental Medicine, University of Firenze and Siena, Policlinico ‘Le Scotte’, viale Bracci, Siena 53100, Italy
| | - F.R. Tay
- Department of Endodontics, College of Dentistry, Georgia Health Sciences University, 1120 15th Street, Augusta, GA, USA
| | - L. Breschi
- Department of Medical Sciences, University of Trieste, Piazza, Ospedale 1, Trieste 34129, Italy
| | - A. Polimeni
- Department of Oral Sciences, ‘Sapienza’ University of Rome, viale Regina Elena 287/A, Roma, Italy
| | - C. Goracci
- Department of Dental Materials and Fixed Prosthodontics of the University of Siena, Tuscan School of Dental Medicine, University of Firenze and Siena, Policlinico ‘Le Scotte’, viale Bracci, Siena 53100, Italy
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197
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Post retentive ability of a new resin composite with low stress behaviour. J Dent 2012; 40:322-8. [DOI: 10.1016/j.jdent.2012.01.007] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2011] [Revised: 01/16/2012] [Accepted: 01/17/2012] [Indexed: 11/24/2022] Open
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198
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Mattos CMA, Las Casas EB, Dutra IGR, Sousa HA, Guerra SMG. Numerical analysis of the biomechanical behaviour of a weakened root after adhesive reconstruction and post-core rehabilitation. J Dent 2012; 40:423-32. [PMID: 22343185 DOI: 10.1016/j.jdent.2012.02.004] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2011] [Revised: 02/07/2012] [Accepted: 02/08/2012] [Indexed: 11/26/2022] Open
Abstract
OBJECTIVES The purpose of this study was to perform a finite element analysis to determine whether adhesive reconstruction is able to restore the original biomechanical behaviour of weakened roots, in terms of fracture resistance, when compared with post/crown-restored teeth with intact roots. METHODS A three-dimensional model of a maxillary central incisor was created. The model simulated an endodontically treated tooth restored with a glass-fibre post, a composite-resin core and a metal crown (Model 1). Based on Model 1, a new volume was created in the root cervical third that represented the area where the dentine structure was lost, resulting in a structurally damaged root (Model 2). A 100N load was applied to the palatal surface at 130° from the long axis of the tooth. After processing (Ansys(®) 10.0 - Canonsburg, PA, USA), the principal normal stress data were analyzed (S1, tensile; S3, compressive). RESULTS The models demonstrated a similar S1 distribution concentrated in the lingual cervical region but different S1 levels (Model 1: 28.7MPa; Model 2: 35.3MPa). The S3 distribution indicated differences in behaviour between the models (Model 1: -18 to -27MPa along the buccal root surface; Model 2: -25 to -32MPa on the post buccal surface and along the buccal root wall). CONCLUSIONS Although the stress distribution within the root walls remained below the ultimate stress limit of the root dentine, the adhesive reconstruction of the weakened roots did not recover the load resistance of structurally intact roots. CLINICAL SIGNIFICANCE The decision of when to prosthetically rehabilitate weakened roots with cervical dentine structural tissue loss is a challenge for clinicians. A 'monoblock' adhesive reconstruction has been proposed for root reinforcement. During treatment planning, the possibility of restoring the mechanical resistance of the root must be evaluated if successful long-term results are to be achieved.
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Affiliation(s)
- C M A Mattos
- PPGMEC, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil.
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199
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Ausiello P, Franciosa P, Martorelli M, Watts DC. Mechanical behavior of post-restored upper canine teeth: A 3D FE analysis. Dent Mater 2011; 27:1285-94. [DOI: 10.1016/j.dental.2011.09.009] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2011] [Revised: 09/16/2011] [Accepted: 09/16/2011] [Indexed: 11/16/2022]
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200
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Ebert J, Leyer A, Günther O, Lohbauer U, Petschelt A, Frankenberger R, Roggendorf MJ. Bond Strength of Adhesive Cements to Root Canal Dentin Tested with a Novel Pull-out Approach. J Endod 2011; 37:1558-61. [DOI: 10.1016/j.joen.2011.08.009] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2011] [Revised: 07/22/2011] [Accepted: 08/02/2011] [Indexed: 11/25/2022]
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