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Wang X, Zhong S, Ma D, Liu C, Liu Y, Zhao Y, Bai S. Polyetheretherketone split post and core for restoration of multirooted molar with insufficient dental tissue remnants by digital techniques: a case report and 3-year follow up. BMC Oral Health 2024; 24:904. [PMID: 39112986 PMCID: PMC11304810 DOI: 10.1186/s12903-024-04666-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2024] [Accepted: 07/24/2024] [Indexed: 08/11/2024] Open
Abstract
BACKGROUND Multi-rooted teeth with extensive dental defects often face challenges in stability and biomechanical failure. High-performance polymer PEEK materials, with properties closer to dentin, show promise in reducing stress concentration and preserving tooth structure. This report aimed to explore the use of a highly retentive polyetheretherketone (PEEK) for manufacturing custom-made split post and core for the restoration of grossly destroyed endodontically treated molars. CLINICAL CONSIDERATIONS A 40-year-old female patient presented with complaints of loss of tooth substance in the posterior mandibular tooth. This case involved the digital design and fabrication of PEEK split post and core to restore multirooted molar with insufficient dental tissue remnants. The restorations were evaluated over a 3-year follow-up using the World Federation criteria (FDI). The restoration was clinically evaluated through intraoral examination, radiographic assessment, and subjective patient satisfaction, and was deemed clinically good according to FDI criteria. CONCLUSION The outstanding mechanical properties of PEEK, coupled with the structure of the split post, provide an effective treatment option for weakened multirooted teeth. Simultaneously, the restoration configuration effectively addressed the challenge of varying postinsertion directions, and the interlocking mechanism between the primary and auxiliary posts enhanced the stability of the post and core.
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Affiliation(s)
- Xin Wang
- State Key Laboratory of Oral & Maxillofacial Reconstruction and Regeneration, National Clinical Research Center for Oral Diseases, Shaanxi Key Laboratory of Stomatology, Digital Dentistry Center, School of Stomatology, The Fourth Military Medical University, Xi'an, Shaanxi, PR China
| | - Sheng Zhong
- State Key Laboratory of Oral & Maxillofacial Reconstruction and Regeneration, National Clinical Research Center for Oral Diseases, Shaanxi Key Laboratory of Stomatology, Digital Dentistry Center, School of Stomatology, The Fourth Military Medical University, Xi'an, Shaanxi, PR China
| | - Dan Ma
- State Key Laboratory of Oral & Maxillofacial Reconstruction and Regeneration, National Clinical Research Center for Oral Diseases, Shaanxi Key Laboratory of Stomatology, Digital Dentistry Center, School of Stomatology, The Fourth Military Medical University, Xi'an, Shaanxi, PR China
| | - Chen Liu
- State Key Laboratory of Oral & Maxillofacial Reconstruction and Regeneration, National Clinical Research Center for Oral Diseases, Shaanxi Key Laboratory of Stomatology, Digital Dentistry Center, School of Stomatology, The Fourth Military Medical University, Xi'an, Shaanxi, PR China
| | - Yuchen Liu
- State Key Laboratory of Oral & Maxillofacial Reconstruction and Regeneration, National Clinical Research Center for Oral Diseases, Shaanxi Key Laboratory of Stomatology, Digital Dentistry Center, School of Stomatology, The Fourth Military Medical University, Xi'an, Shaanxi, PR China
| | - Yimin Zhao
- State Key Laboratory of Oral & Maxillofacial Reconstruction and Regeneration, National Clinical Research Center for Oral Diseases, Shaanxi Key Laboratory of Stomatology, Digital Dentistry Center, School of Stomatology, The Fourth Military Medical University, Xi'an, Shaanxi, PR China
| | - Shizhu Bai
- State Key Laboratory of Oral & Maxillofacial Reconstruction and Regeneration, National Clinical Research Center for Oral Diseases, Shaanxi Key Laboratory of Stomatology, Digital Dentistry Center, School of Stomatology, The Fourth Military Medical University, Xi'an, Shaanxi, PR China.
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Costa TS, Brandão RMR, Farias Vajgel BC, SoutoMaior JR. CAD-CAM glass fiber compared with conventional prefabricated glass fiber posts: A systematic review. J Prosthet Dent 2024; 132:337-342. [PMID: 35933174 DOI: 10.1016/j.prosdent.2022.01.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2021] [Revised: 01/03/2022] [Accepted: 01/04/2022] [Indexed: 11/17/2022]
Abstract
STATEMENT OF PROBLEM A prefabricated glass fiber post provides esthetic and biomechanical benefits for severely damaged endodontically treated teeth; however, failures in post retention remain a challenge. PURPOSE The purpose of this systematic review was to compare the fracture resistance and bond strength of prefabricated glass fiber posts to those made with computer-aided design and computer-aided manufacturing (CAD-CAM). MATERIAL AND METHODS This review was entered into PROSPERO (CRD42020213668) and was based on the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines. Electronic systematic searches of PubMed/MEDLINE, Embase, and the Cochrane Library were conducted for published articles until October 2020. Studies that compared prefabricated glass fiber posts with CAD-CAM-fabricated glass fiber posts were selected, and studies that had not been published in English or in the previous 10 years were excluded. The fracture resistance (N) and bond strength (MPa) were the primary outcomes. RESULTS After reviewing the title, abstract, and the entire text of 227 articles, 8 studies were selected. Four studies were omitted. Four of the 8 studies were retained for qualitative analyses, with 1 having a high risk of bias and 3 having a medium risk of bias. Only 1 study found significantly higher fracture resistance in the CAD-CAM group than in the prefabricated group. The bond strength study reported a significant difference, with the CAD-CAM group having greater bond strength than the prefabricated group. CONCLUSIONS Despite the high heterogeneity and the few included articles, a tendency was found for the CAD-CAM-fabricated glass fiber post to improve fracture resistance and bond strength. However, the available literature is insufficient to draw definitive conclusions.
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Affiliation(s)
- Tiago S Costa
- Predoctoral student, School of Dentistry, Federal University of Pernambuco (UFPE), Recife, Pernambuco, Brazil
| | - Ruana M R Brandão
- Master's Degree student, Department of Prosthesis and Oral-Facial Surgery, Federal University of Pernambuco (UFPE), Recife, Pernambuco, Brazil
| | - Bruna C Farias Vajgel
- Adjunct Professor, Department of Prosthesis and Oral-Facial Surgery, Federal University of Pernambuco (UFPE), Recife, Pernambuco, Brazil
| | - Juliana R SoutoMaior
- Adjunct Professor, Department of Prosthesis and Oral-Facial Surgery, Federal University of Pernambuco (UFPE), Recife, Pernambuco, Brazil.
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Teixeira CDS, Vitali FC, Bortoluzzi EA, Garcia LDFR. Longer light-curing time decreases the effect of ageing on composite resin hardness used in root reinforcement. AUST ENDOD J 2024. [PMID: 38745526 DOI: 10.1111/aej.12856] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2024] [Revised: 05/03/2024] [Accepted: 05/07/2024] [Indexed: 05/16/2024]
Abstract
This study evaluated the hardness of a composite resin used for root reinforcement, considering the light-curing time, root canal region and ageing due to long-term storage. Twenty incisor roots were reinforced using composite resin, varying the photopolymerisation time (40 or 120 s). Following fibre post cementation, the roots were transversely sectioned into coronal, middle and apical regions. Composite hardness was measured initially and after 18 months of water storage. Data underwent repeated measures analysis of variance and Tukey's post hoc tests. The factors 'light-curing time', 'root region' and 'ageing' affected the hardness. Significant interactions were observed between 'light-curing time × root region' and 'ageing × light-curing time'. Regardless of time, resin hardness in the apical region was lower. After ageing, hardness in the coronal and middle regions decreased when the light-curing time was 40 s, while no significant effect on hardness was noted with a light-curing time of 120 s.
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Affiliation(s)
| | - Filipe Colombo Vitali
- Department of Dentistry, Federal University of Santa Catarina, Florianopolis, Santa Catarina, Brazil
| | - Eduardo Antunes Bortoluzzi
- Department of Diagnosis & Oral Health, School of Dentistry, University of Louisville, Louisville, Kentucky, USA
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Maximiano GS, de Carvalho GM, Felipe Ferreira FFDC, de Almeida Pinheiro F, Noritomi PY, Campos MJDS, Vitral RWF. Comparative analysis of the biomechanical behavior of the maxillary central incisors restored with glass fiber post and cast metal post and core submitted to orthodontic forces: A study with finite elements. Am J Orthod Dentofacial Orthop 2024; 165:46-53. [PMID: 37656069 DOI: 10.1016/j.ajodo.2023.06.025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2022] [Revised: 06/01/2023] [Accepted: 06/01/2023] [Indexed: 09/02/2023]
Abstract
INTRODUCTION Different types of intraradicular restorations and their insertion have an impact on teeth biomechanics. This study aimed to analyze the biomechanical behavior of maxillary central incisors restored with glass fiber post (GFP) and cast metal post and core (CMP) subjected to buccolingual and mesiodistal orthodontic forces using the finite element method. METHODS Two models of the maxillary central incisor with periodontal ligament, cortical bone, and trabecular bone were made. One of the models included intraradicular restoration with GFP, whereas, in the other, the incisor was restored with CMP. After creating the tridimensional mesh of finite elements, applying 2 orthodontic forces were simulated: 65 g of buccolingual force and 70 g of mesiodistal force. The forces were applied parallel to the palatal plane in the region of the bracket slot, located 4 mm to the incisal edge. RESULTS The maximum stresses generated in the GFP-restored root were 3.642 × 10-1 MPa and 4.755 × 10-1 MPa from the buccolingual and mesiodistal forces, respectively. Likewise, the stresses in the CMP restored root were 2.777 × 10-1MPa and 3.826 × 10-1MPa. The radicular area with higher stress on both models was located in the cervical third: on the buccal surface when the buccolingual force was applied and on the mesial surface when the mesiodistal force was applied. The highest stress levels were found on the CMP structure. CONCLUSIONS The incisor restored with cast metal post revealed lower stress values transferred to the root than the one restored with GFP. The stresses on the structure of the GFP were lower and more homogeneous than the ones found on the cast metal post. The difference among the stress values in the materials is within a safe margin for using both materials in relation to orthodontic forces.
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Affiliation(s)
- Gustavo Silva Maximiano
- Department of Orthodontics, Juiz de Fora Federal University, Juiz de Fora, Minas Gerais, Brazil
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Morgan LFDSA, Martins AV, Hauss DD, Maia LM, Silva NRFA, Silveira RRD, Albuquerque RDC. Treatment of a severely compromised endodontically treated tooth with a 2-piece premanufactured glass-fiber post: A clinical report. J Prosthet Dent 2023:S0022-3913(23)00541-3. [PMID: 38057198 DOI: 10.1016/j.prosdent.2023.08.011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2023] [Revised: 08/05/2023] [Accepted: 08/09/2023] [Indexed: 12/08/2023]
Abstract
A 2-piece premanufactured glass-fiber post-and-core for a child with a severely compromised endodontically treated tooth to restore dental form, function, and esthetics, is described. A shorter chair time than for the conventional options was needed, and the post provided an adequate biomechanical response with a reduced intracanal cement thickness.
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Affiliation(s)
- Luís Fernando Dos Santos Alves Morgan
- Professor, Department of Restorative Dentistry, Faculty of Dentistry, Federal University of Minas Gerais (UFMG), Belo Horizonte, Minas Gerais, Brazil
| | - Adriana Vieira Martins
- Professor, Department of Restorative Dentistry, UNA Dentistry School (UNA), Sete Lagoas, Minas Gerais, Brazil.
| | - Débora Drummond Hauss
- Professor, Department of Restorative Dentistry, College of Business Studies (FEAD), Belo Horizonte, Minas Gerais, Brazil
| | - Lucas Moreira Maia
- Professor, Department of Restorative Dentistry, Pitágoras Faculty, Belo Horizonte, Minas Gerais, Brazil
| | - Nelson Renato França Alves Silva
- Professor, Department of Restorative Dentistry, Faculty of Dentistry, Federal University of Minas Gerais (UFMG), Belo Horizonte, Minas Gerais, Brazil
| | - Rodrigo Richard da Silveira
- Professor, Department of Restorative Dentistry, Faculty of Dentistry, Federal University of Minas Gerais (UFMG), Belo Horizonte, Minas Gerais, Brazil
| | - Rodrigo de Castro Albuquerque
- Professor, Department of Restorative Dentistry, Faculty of Dentistry, Federal University of Minas Gerais (UFMG), Belo Horizonte, Minas Gerais, Brazil
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The Influence on Fracture Resistance of Different Composite Resins and Prefabricated Posts to Restore Endodontically Treated Teeth. Polymers (Basel) 2023; 15:polym15010236. [PMID: 36616585 PMCID: PMC9823756 DOI: 10.3390/polym15010236] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2022] [Accepted: 12/23/2022] [Indexed: 01/05/2023] Open
Abstract
Recent formulations of resin-based composites have incorporated different combinations of materials. However, the mechanical and bonding behavior of these materials with intraradicular posts are unclear. This study aimed to evaluate the effect of light-cure and dual-cure resin composite posts on the fracture resistance of endodontically-treated teeth. Materials and Methods: Ninety extracted human upper canines were selected and randomly divided into nine groups (n=10): (G1) endodontically treated teeth without endodontic posts; (G2) glass-fiber post cemented with glass-ionomer cement; (G3) endodontic post by dual-cure composite resin (Rebilda DC); (G4) endodontic post by dual-cure composite resin (Cosmecore); (G5) endodontic post by dual-cure composite resin (Bis-Core); (G6) endodontic post by light-cure composite resin; (G7) glass-fiber post customized with flowable composite resin; (G8) glass-fiber post cemented with light-cure composite resin; (G9) glass-fiber post cemented with self-adhesive resin cement. After the post insertion, all specimens were subjected to mechanical (250,000 cycles) and thermocycling (6000 cycles, 5 °C/55 °C) and immediate loading at 45 degrees in a universal testing machine until fracture. The data were analyzed by one-way ANOVA and multiple comparisons using the Fisher LSD Method (p < 0 05). Results: The mean failure loads (±SD) for the groups ranged from 100.7 ± 22.6 N to 221.9 ± 48.9 N. The G1 group (without endodontic posts) had a higher fracture strength than all experimental groups (p < 0.001). Conclusions: Within the limitations, the light- and dual-cure post technique did not present lower fracture resistance values as compared to the conventional glass-fiber post.
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Hammal M, Chlup Z, Ingr T, Staněk J, Mounajjed R. Effectiveness of dentin pre-treatment on bond strength of two self-adhesive resin cements compared to an etch-and-rinse system: an in vitro study. PeerJ 2021; 9:e11736. [PMID: 34754615 PMCID: PMC8555495 DOI: 10.7717/peerj.11736] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2021] [Accepted: 06/17/2021] [Indexed: 11/20/2022] Open
Abstract
Statement of problem It has been shown that selective etching improves the bond strength of some self-adhesive resin cements to enamel. The same has yet to be determined with dentin pre-treatment. Purpose To evaluate the tensile bond strength of two self-adhesive resin cements after two dentin surface pre-treatments, and also to analyze the cement/dentin interface. Material and Methods One hundred and twelve human third molars were extracted. The teeth were distributed into seven groups (n = 16). Maxcem Elite Chroma (MAX) (Kerr, Scafati, Italy) and Relyx U200 (RLX) (3M ESPE, Neuss, Germany) were used without pre-treatment or with two dentin pre-treatments (polyacrylic acid or phosphoric acid). A conventional etch-and-rinse (EAR) luting cement, NX3 Nexus (NX3) (Kerr, Scafati, Italy), was used as an external control group. Before testing, all specimens were stored in distilled water for 24 hours. Three specimens from each group were prepared for scanning electron microscopy observation (SEM). A tensile bond strength test (TBS) was performed for the remaining samples. The data were statistically analyzed using the Kruskal–Wallis test and Pairwise comparisons using the Wilcoxon rank sum test. Results MAX without pre-treatment and with phosphoric acid etching attained statistically similar bond strengths to NX3 (P > 0.05). There was a statistical difference (P = 0.00488) between RLX without pre-treatment (5.62 MPa) and NX3 (10.88 MPa). Phosphoric acid pre-treatment increases the bond strength values of RLX to a strength that is comparable to NX3 (P > 0.05). The lowest tensile bond strength (TBS) was attained after the application of polyacrylic acid with MAX (1.98 MPa). No statistical differences were found between the RLX bond strength values after polyacrylic acid treatment and RLX without pre-treatment or NX3 (P > 0.05). SEM observations disclosed an enhanced potential of the self-adhesive cements to infiltrate into dentin tubules and form resin tags when applied after phosphoric acid pre-treatment. The failure mode was dominantly adhesive. Conclusions On dentin, the self-adhesive resin cement MAX might be an effective alternative to conventional resin cement. Etching the dentin with phosphoric acid does not have a negative effect on the bond strength of MAX to dentin. On the other hand, phosphoric acid improved the bond strength of RLX when compared to EAR cement.
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Affiliation(s)
- Milad Hammal
- Institute of Dentistry and Oral Sciences, Palacký University, Olomouc, Czech Republic
| | - Zdeněk Chlup
- Academy of Science of the Czech Republic, Institute of Physics of Materials, Brno, Czech Republic
| | - Tomáš Ingr
- Faculty of Science, Department of Experimental Physics, Palacký University, Olomouc, Czech Republic
| | - Ján Staněk
- Institute of Dentistry and Oral Sciences, Palacký University, Olomouc, Czech Republic
| | - Radek Mounajjed
- Institute of Dentistry and Oral Sciences, Palacký University, Olomouc, Czech Republic.,DCM Clinic, Hradec Kralove, Czech Republic
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Silva CF, Cabral LC, Navarro de Oliveira M, da Mota Martins V, Machado AC, Blumenberg C, Paranhos LR, Santos-Filho PCF. The influence of customization of glass fiber posts on fracture strength and failure pattern: A systematic review and meta-analysis of preclinical ex-vivo studies. J Mech Behav Biomed Mater 2021; 118:104433. [PMID: 33684707 DOI: 10.1016/j.jmbbm.2021.104433] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2020] [Revised: 02/22/2021] [Accepted: 02/26/2021] [Indexed: 12/14/2022]
Abstract
OBJECTIVE To perform a systematic review of the literature focused to evaluate in vitro function of prefabricated fiber posts with and without customization by additional auxillary fiber posts and composite resin on the fracture strength of wide or enlarged canals and the failure pattern. METHODS Six databases were used as primary search sources (PubMed, Scopus, LILACS, SciELO, Science Direct, and Web of Science) and three databases (Open Grey, Open Thesis, and OATD) were used to partially capture the "grey literature". The research included laboratory studies that used human upper anterior teeth aiming to assess the fracture strength and failure pattern of different glass fiber post customizations by additional auxiliary fiber posts or composite resin. The search had no restriction of year, language, and publication status. The risk of bias of the studies was assessed from the criteria established in systematic reviews of laboratory studies. Standardized mean differences were calculated by comparing the mean fracture strengths of customized and non-customized posts. Pooled estimates were calculated by Glass' delta method using the random-effects model. Subtotal estimates were presented according to each type of relining procedure and an overall estimate was described considering all studies combined. RESULTS The search provided 2291 results, from which six met the eligibility criteria and were included in the qualitative assessment of the review. Only three studies presented a moderate risk of bias. The meta-analysis results showed that the use of auxiliary posts produced higher mean fracture strengths than non-customized posts (SMD = 2.21; 95%CI: 0.74; 3.68), and it was more effective than the use of composite resin to reline the posts. CONCLUSION Based on laboratories studies, even though has not been observed any difference to a statistically significant level on fracture strength and failure pattern of the customized and non-customized post, future studies should follow a standardized approach to implementation and reporting of data.
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Affiliation(s)
- Camila Ferreira Silva
- Post-graduate Program in Dentistry, School of Dentistry, Federal University of Uberlândia, Uberlândia, Brazil
| | - Luana Cardoso Cabral
- Post-graduate Program in Dentistry, School of Dentistry, Federal University of Uberlândia, Uberlândia, Brazil
| | - Murilo Navarro de Oliveira
- Post-graduate Program in Dentistry, School of Dentistry, Federal University of Uberlândia, Uberlândia, Brazil
| | - Victor da Mota Martins
- Post-graduate Program in Dentistry, School of Dentistry, Federal University of Uberlândia, Uberlândia, Brazil
| | - Alexandre Coelho Machado
- Department of Oral Health, Technical Health School, Federal University of Uberlândia, Uberlândia, Brazil
| | - Cauane Blumenberg
- Post-graduate Program in Epidemiology, Federal University of Pelotas, Pelotas, RS, Brazil
| | - Luiz Renato Paranhos
- Department of Preventive and Community Dentistry, School of Dentistry, Federal University of Uberlândia, Uberlândia, Brazil.
| | - Paulo César Freitas Santos-Filho
- Department of Operative Dentistry and Dental Materials, School of Dentistry, Federal University of Uberlândia, Uberlândia, Brazil
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Silva-Sousa AC, Moris ICM, Barbosa AFS, Silva-Sousa YTC, Sousa-Neto MD, Pires CRF, Gomes EA. Effect of restorative treatment with endocrown and ferrule on the mechanical behavior of anterior endodontically treated teeth: An in vitro analysis. J Mech Behav Biomed Mater 2020; 112:104019. [PMID: 32829166 DOI: 10.1016/j.jmbbm.2020.104019] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2020] [Revised: 07/29/2020] [Accepted: 07/31/2020] [Indexed: 10/23/2022]
Abstract
This study evaluated the effect of endocrown and ferrule restorative treatment on the mechanical behavior of anterior endodontically treated teeth. Human canines were treated endodontically and distributed in five groups (n = 10): sound teeth (S), crown associated with glass fiber post (GFP) and ferrule (GFPf+) and that without ferrule (GFPf-), and endocrown with ferrule (Ef+) and that without ferrule (Ef-). The crowns were obtained in lithium disilicate-based glass ceramic and cemented with resin. Thermomechanical loading (TL) was performed with progressive load of 80, 120, 160, 200, 240, 280, and 320 N with 20,000 cycles each, 140,000 cycles in total, frequency of 5 Hz, and temperature variation of 5°C-55 °C, followed by fracture resistance testing with load cell of 1000 Kgf and crosshead speed of 0.5 mm/min in a universal testing machine. Failure mode has been evaluated. Data were compared by Kaplan-Meier survival analysis (p < 0.05) for TL and one-way ANOVA and Tukey's test (p < 0.05) for fracture resistance. TL showed higher number of fractures for groups without ferrule (GFPf- = 7, GFPf+ = 3, Ef- = 10, and Ef+ = 2) and lower mean fracture load probability (GFPf+ = 300 N, GFPf- = 280 N, Ef+ = 320 N, Ef- = 188 N) than those with ferrule. Regarding fracture, teeth rehabilitated with GFP were more resistant to endocrowns with ferrule (p < 0.05). A higher percentage of type III failures after fatigue and type II failures after fracture were found. In conclusion, rehabilitation using GFP with ferrule is more favorable for anterior teeth, but the use of endocrown with ferrule proved feasible.
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Affiliation(s)
- Alice Corrêa Silva-Sousa
- School of Dentistry, University of Ribeirão Preto (UNAERP), Ribeirão Preto, SP, Brazil; Department of Restorative Dentistry, School of Dentistry of Ribeirão Preto, University of São Paulo (FORP-USP), Ribeirão Preto, SP, Brazil
| | - Izabela C M Moris
- School of Dentistry, University of Ribeirão Preto (UNAERP), Ribeirão Preto, SP, Brazil
| | | | | | - Manoel Damião Sousa-Neto
- Department of Restorative Dentistry, School of Dentistry of Ribeirão Preto, University of São Paulo (FORP-USP), Ribeirão Preto, SP, Brazil
| | - Cassiano Ricardo Ferreira Pires
- Department of Restorative Dentistry, School of Dentistry of Ribeirão Preto, University of São Paulo (FORP-USP), Ribeirão Preto, SP, Brazil
| | - Erica Alves Gomes
- School of Dentistry, University of Ribeirão Preto (UNAERP), Ribeirão Preto, SP, Brazil.
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Gruber YL, Bakaus TE, Bittencourt BF, Gomes JC, Reis A, Gomes GM. Effect of surface treatments on repair strength, roughness and morphology in aged metal-free crowns. BRAZILIAN JOURNAL OF ORAL SCIENCES 2020. [DOI: 10.20396/bjos.v19i0.8656155] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
Aim: The roughness and micromorphology of various surface treatments in aged metal-free crowns and the bond strength of these crowns repaired with composite resin (CR) was evaluated in vitro. Methods: A CR core build-up was confectioned in 60 premolars and prepared for metal-free crowns. Prepared teeth were molded with the addition of silicone, and the laboratory ceromer/fiber-reinforced crowns (SR Adoro/Fibrex Lab) were fabricated. Subsequently, the crowns were cemented and artificially aged in a mechanical fatigue device (1.2 X 106 cycles), then divided into 4 groups (n = 15) according to the surface treatment: 1) phosphoric acid etching (PA); 2) PA + silane application; 3) roughening with a diamond bur + PA; and 4) sandblasting with Al2O3 + PA. After the treatments, the crowns (n = 2) were qualitatively analyzed by scanning electron microscope (SEM) and surface roughness (n = 5) was analyzed before and after the surface treatment (Ra parameter). The remaining crowns (n = 8) received standard repair with an adhesive system (Tetric N-Bond) and a nanohybrid CR (Tetric N-Ceram), and the microshear bond strength (SBS) test was performed (0.5 mm/min). Roughness and SBS data were analyzed by one- and two-way ANOVA, respectively, as well as Tukey’s post-test (α = 0.05). Results: Sandblasting with Al2O3 + PA resulted in the highest final roughness and SBS values. The lowest results were observed in the PA group, whereas the silane and diamond bur groups showed intermediate values. Conclusion: It may be concluded that indirect ceromer crowns sandblasted with aluminum oxide prior to PA etching promote increased roughness surface and bond strength values.
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Oliveira L, De Matos LR, Silva A, Silva JDA, Silva M. Resistance to fracture of endodontically treated teeth: Influence of the post systems and cements. Dent Res J (Isfahan) 2020. [DOI: 10.4103/1735-3327.302888] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
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