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Kahyaie Aghdam M, Bahari M, Mohammadi N, Savadi Oskoee S, Ebrahimi Chaharom ME. Push-Out Bond Strength of Fiber Posts to Overflared Root Canals in Different Root Regions: Effect of Reinforcement Techniques. Front Dent 2024; 21:24. [PMID: 39104788 PMCID: PMC11298702 DOI: 10.18502/fid.v21i24.16115] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2023] [Accepted: 01/12/2024] [Indexed: 08/07/2024] Open
Abstract
Objectives: This study aimed to investigate the effect of different reinforcement techniques on the push-out bond strength of fiber posts to over-flared root canals. Materials and Methods: Forty-eight extracted human single-canal premolars were endodontically treated, over-flared, and randomly divided into four groups (N=12) including SARC: luting with self-adhesive resin cement, DCC: luting with dual-cure core build-up resin composite, CRR: relining root canal walls with bulk-fill resin composite, and DAP: relining fiber post with bulk-fill resin composite. After 24 hours, the roots were sectioned to obtain three cervical, middle, and apical 3mm slices. The push-out test was performed and failure pattern was examined. Kruskal-Wallis and post-hoc Dunn-Bonferroni tests were used for statistical analysis (P<0.05). Results: In all three regions, the lowest and highest bond strength was found in the SARC and DAP groups, respectively. In the middle region, there was a statistically significant difference between the bond strength of the SARC group and that of the DCC (P=0.044), CRR (P=0.021), and DAP (P<0.001) groups. There was no significant difference in the apical region. The lowest bond strength was observed in the apical region, and the highest was related to the cervical region. Adhesive failure was the most common failure pattern in all groups. Conclusion: Based on our results DCC, CRR and DAP methods increased bond strength in the middle and cervical sections of over-flared root regions. Considering that DCC is the easiest and most practical method, we propose that CRR and DAP can be replaced with this method in clinical procedures.
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Affiliation(s)
- Mina Kahyaie Aghdam
- Department of Operative Dentistry, Dental Faculty, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Mahmoud Bahari
- Dental and Periodontal Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Narmin Mohammadi
- Department of Operative Dentistry, Dental Faculty, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Siavash Savadi Oskoee
- Department of Operative Dentistry, Dental Faculty, Tabriz University of Medical Sciences, Tabriz, Iran
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dos Santos Junior WL, Santi MR, Lins RBE, Martins LRM. Effects of a relined fiberglass post with conventional and self-adhesive resin cement. Restor Dent Endod 2024; 49:e18. [PMID: 38841382 PMCID: PMC11148402 DOI: 10.5395/rde.2024.49.e18] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2023] [Revised: 01/10/2024] [Accepted: 01/26/2024] [Indexed: 06/07/2024] Open
Abstract
Objectives This study was conducted to evaluate the mechanical properties of relined and non-relined fiberglass posts when cemented to root canal dentin using a conventional dual-cure resin cement or a self-adhesive resin cement. Materials and Methods Two types of resin cements were utilized: conventional and self-adhesive. Additionally, 2 cementation protocols were employed, involving relined and non-relined fiberglass posts. In total, 72 bovine incisors were cemented and subjected to push-out bond strength testing (n = 10) followed by failure mode analysis. The cross-sectional microhardness (n = 5) was assessed along the root canal, and interface analyses (n = 3) were conducted using scanning electron microscopy (SEM). Data from the push-out bond strength and cross-sectional microhardness tests were analyzed via 3-way analysis of variance and the Bonferroni post-hoc test (α = 0.05). Results For non-relined fiberglass posts, conventional resin cement exhibited higher push-out bond strength than self-adhesive cement. Relined fiberglass posts yielded comparable results between the resin cements. Type II failure was the most common failure mode for both resin cements, regardless of cementation protocol. The use of relined fiberglass posts improved the cross-sectional microhardness values for both cements. SEM images revealed voids and bubbles in the incisors with non-relined fiberglass posts. Conclusions Mechanical properties were impacted by the cementation protocol. Relined fiberglass posts presented the highest push-out bond strength and cross-sectional microhardness values, regardless of the resin cement used (conventional dual-cure or self-adhesive). Conversely, for non-relined fiberglass posts, the conventional dual-cure resin cement yielded superior results to the self-adhesive resin cement.
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Affiliation(s)
- Wilton Lima dos Santos Junior
- Operative Dentistry Division, Department of Restorative Dentistry, Piracicaba Dental School, University of Campinas, Piracicaba, Brazil
| | - Marina Rodrigues Santi
- Operative Dentistry Division, Department of Restorative Dentistry, Piracicaba Dental School, University of Campinas, Piracicaba, Brazil
| | - Rodrigo Barros Esteves Lins
- Operative Dentistry Division, Department of Restorative Dentistry, School of Dentistry, Federal University of Alagoas, Campus A. C. Simões, Maceió, Alagoas, Brazil
| | - Luís Roberto Marcondes Martins
- Operative Dentistry Division, Department of Restorative Dentistry, Piracicaba Dental School, University of Campinas, Piracicaba, Brazil
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Maia BDGO, Santos TDSA, Carvalho CAT, Verner FS, Junqueira RB. Fracture resistance of weakened roots restored with relined or milled CAD-CAM glass fiber posts. Dent Mater J 2023; 42:92-98. [PMID: 36351602 DOI: 10.4012/dmj.2022-114] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
This in vitro study compared the fracture resistance of weakened roots restored with milled or relined glass fiber post (GFP). Seventy bovine incisors were divided into seven groups, according to the weakening protocol (none: control; medium-weakened: MW; highly-weakened: HW) and post anatomization technique (non-relined, relined with Bulk Fill or Z350 resin; milled GFP: M). Roots were thermomechanical cycled and submitted to compression. Frequencies and groups were compared by the chi-square test and two-factor ANOVA, Tukey's, and t-test (α=5%). The HW-M obtained the lowest values, showing significant differences compared to all groups (p<0.001). The highest value was HW-Bulk fill, with significant difference compared to MW-M (p=0.037) and HW-M (p<0.001). The frequency of repairable fractures was 100% in the control, 87%, and 63% in the MW and HW, respectively. Relined or milled GFPs can be considered to rehabilitate weakened teeth since failure patterns were predominantly repairable in all groups.
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Affiliation(s)
| | - Thais da Silva Alves Santos
- Department of Restorative Dentistry, Endodontic Division, São Paulo State University (Unesp), Institute of Science and Technology
| | - Cláudio Antonio Talge Carvalho
- Department of Restorative Dentistry, Endodontic Division, São Paulo State University (Unesp), Institute of Science and Technology
| | | | - Rafael Binato Junqueira
- Health Applied Science Program and Department of Dentistry, Federal University of Juiz de Fora
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Santi MR, Lins RBE, Sahadi BO, Martins LRM, Soto‐Montero JR. Evaluation of pretreatments on intra‐radicular dentin bond strength of self‐adhesive resin cements. J ESTHET RESTOR DENT 2022; 34:1051-1059. [DOI: 10.1111/jerd.12922] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2022] [Revised: 04/21/2022] [Accepted: 04/22/2022] [Indexed: 11/30/2022]
Affiliation(s)
- Marina Rodrigues Santi
- Piracicaba Dental School, Department of Restorative Dentistry State University of Campinas Piracicaba Sao Paulo Brazil
| | - Rodrigo Barros Esteves Lins
- Piracicaba Dental School, Department of Restorative Dentistry State University of Campinas Piracicaba Sao Paulo Brazil
| | - Beatriz Ometto Sahadi
- Piracicaba Dental School, Department of Restorative Dentistry State University of Campinas Piracicaba Sao Paulo Brazil
| | | | - Jorge Rodrigo Soto‐Montero
- School of Dentistry, Department of Restorative Dentistry University of Costa Rica Montes de Oca San José Costa Rica
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Santi MR, Lins R, Sahadi BO, Soto-Montero JR, Martins L. Comparison of the Mechanical Properties and Push-out Bond Strength of Self-adhesive and Conventional Resin Cements on Fiber Post Cementation. Oper Dent 2022; 47:346-356. [PMID: 35776956 DOI: 10.2341/21-015-l] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/03/2021] [Indexed: 01/26/2023]
Abstract
OBJECTIVES The purpose of this study was to compare the mechanical properties and push-out bond strength of self-adhesive resin cements (SACs) and a conventional resin cement (CRC). METHODS AND MATERIALS Eighty bovine incisors were divided into four groups for cementation of a fiberglass post (Whitepost - FGM Dental Group, Coral Springs, FL) with different resin cements: three SACs (Maxcem Elite, MAX - Kerr; Calibra Universal, CAL - Dentsply; and RelyX Unicem 2, RUN - 3M Oral Care) and one CRC (RelyX Ultimate, RXU - 3M Oral Care). The groups were subdivided into two groups each (n=10) for evaluation of the push-out bond strength test (POBS) after 24 hours of water storage or after thermal aging (5000 cycles), following 24 hours of storage. The failure modes were evaluated using a stereomicroscope. Flexural strength (FS) and modulus of elasticity (EM) were determined using a three-point bending. Also, pH of the cements was measured over 48 hours and filler morphology was observed by scanning electron microscopy. Appropriate statistical analyses were performed by SPSS 21.0 (SPSS Inc., Chicago, IL, USA), with a significance level set at 5%. Results: RXU presented the highest POBS at both evaluation times. Among the SACs, RUN and CAL presented significantly lower POBS than MAX in cervical and middle-thirds at the 24-hour evaluation, and in all root regions after thermocycling. Adhesive failure between the cement and dentin were the most prevalent fractures at both times evaluated. MAX presented the lowest FS and RUN showed the highest EM. The pH reached the minimal point at the 30-minute evaluation for RXU and MAX. For RUN and CAL, the minimal pH was observed at the 60-minute evaluation. RXU and RUN presented spherical and regular filler particles, while MAX and CAL presented irregularly shaped and sized filler particles. CONCLUSIONS The mechanical behavior of SACs is not superior to CRC; however, among all the SACs evaluated, MAX presented the highest POBS and stability after thermocycling evaluation. MAX also reached the closest neutral pH after 48 hours. Therefore, SACs with low initial pH and strong neutralization reactions are recommended, because these characteristics may lead to better mechanical properties and stability.
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Affiliation(s)
- M R Santi
- *Marina Rodrigues Santi, DDS, MS, PhD student, Department of Restorative Dentistry, Piracicaba Dental School, State University of Campinas, Piracicaba, SP, Brazil
| | - Rbe Lins
- Rodrigo Barros Esteves Lins, DDS, MS, PhD, Piracicaba Dental School, State University of Campinas, Piracicaba, SP, Brazil
| | - B O Sahadi
- Beatriz Ometto Sahadi, DDS, MS, PhD student, Piracicaba Dental School, State University of Campinas, Piracicaba, SP, Brazil
| | - J R Soto-Montero
- Jorge Rodrigo Soto-Montero, DDS, MS, PhD, invited professor, University of Costa Rica, School of Dentistry, Department of Restorative Dentistry, Montes de Oca, SJ, Costa Rica
| | - Lrm Martins
- Luís Roberto Marcondes Martins, DDS, MS, PhD, professor, Piracicaba Dental School, University of Campinas, Piracicaba, SP, Brazil
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Cayo-Rojas C, Santander-Rengifo F, Castillo-Andamayo D, Tay L, López-Gurreonero C, Cornejo-Pinto A, Cervantes-Ganoza L. Bond strength and failure mode of glass fiber posts with different surface treatments prior to silanization: An in vitro comparative study. J Int Soc Prev Community Dent 2022; 13:42-53. [PMID: 37153932 PMCID: PMC10155880 DOI: 10.4103/jispcd.jispcd_292_21] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2021] [Revised: 02/03/2022] [Accepted: 03/15/2022] [Indexed: 11/11/2022] Open
Abstract
Aim The use of chemical agents in the surface treatment of glass fiber posts can improve their bond strength to the root canal. The aim of this study was to assess the bond strength and failure mode of glass fiber posts that received different surface treatments prior to silanization. Materials and Methods In this cross-sectional and in vitro experimental study, 50 human lower premolar roots were randomly divided into five groups and subsequently prepared to receive the cementation of a fiberglass post prior to silanization. They were distributed as group 1 (with 24% hydrogen peroxide), group 2 (with 37% phosphoric acid), group 3 (with 1.23% acidulated phosphate fluoride for 2 minutes), group 4 (with 1.23% acidulated phosphate fluoride for 6 minutes), and group 5 (without pretreatment). After cementation, the roots were sectioned into two discs for each cervical, middle, and apical region. Bond strength was assessed using the push out technique. Adhesive, mixed, and cohesive failure modes were also assessed. For data analysis, ANOVA and Tukey's post hoc tests were used, as well as Pearson's chi-square test. A significance of P < 0.05 was considered in all statistical analyses. Results When comparing the bond strength of root regions, significant differences were obtained in groups pretreated with phosphoric acid (P = 0.018) and acidulated phosphate fluoride for 2 and 6 minutes (P = 0.001 and P = 0.000, respectively). Furthermore, significant differences were obtained between posts treated only with silane and those that received phosphoric acid pretreatment (P = 0.006) and acidulated phosphate fluoride for 6 minutes (P = 0.001). Significant association of mixed failure mode was observed with hydrogen peroxide (P = 0.014) and phosphoric acid (P = 0.006) pretreatments. Cohesive failure was significantly associated with acidulated phosphate fluoride pretreatment for 2 minutes (P = 0.032) and with posts that did not receive treatment prior to silanization (P = 0.000). Conclusion Posts treated only with silane and pretreated with hydrogen peroxide and acidulated phosphate fluoride for 2 minutes presented significantly higher bond strength with respect to those pretreated with phosphoric acid and acidulated phosphate fluoride for 6 minutes. However, acidulated phosphate fluoride for 2 minutes and silane were associated with a better bonding type.
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Pereira R, Lins RBE, Rodrigues VC, Lima DANL, Martins LRM, Aguiar FHB. Glass fiber posts. BRAZILIAN JOURNAL OF ORAL SCIENCES 2020. [DOI: 10.20396/bjos.v19i0.8657508] [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: Glass fiber posts are indicated in the rehabilitation of extensively damaged teeth; their cementation represents a critical step in restorative dentistry. The aim of this study was to quantify and compare the push-out bond strength of glass fiber posts cemented by conventional technique, two-step technique with luting agent and two-step technique associating bulk-fill composite and luting agent. Methods: Eighty maxillary bovine incisors were endodontically treated and divided into eight groups (n = 10) according to the luting agent (Rely X ARC and Duo-link) and cementation technique (conventional technique; two-step technique with luting agent; and two-step technique associating bulk-fill composite – Filtek Bulk-fill flow or Surefil SDR flow – and luting agent). Samples were submitted to pushout bond strength test, and the fracture pattern was evaluated through scanning electron microscope. Data were submitted to two-way ANOVA and Tukey’s test (α = 0.05). Results: When Rely X ARC was used, the conventional cementation technique obtained higher bond strength values than the twostep technique associated with Filtek Bulk-fill flow. When Duolink was used, the two-step technique associated with Filtek Bulk-fill flow presented higher bond strength values than the conventional technique. The most prevalent fracture patterns were adhesive between luting agent and dentin, and adhesive between bulk-fill composite and dentin. Conclusion: Two-step cementation technique associated with bulk-fill composite may be promising depending on the luting agent used.
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