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Fatigue Resistance of Dissected Lower First Molars Restored with Direct Fiber-Reinforced Bridges—An In Vitro Pilot Study. Polymers (Basel) 2023; 15:polym15061343. [PMID: 36987124 PMCID: PMC10053716 DOI: 10.3390/polym15061343] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2023] [Revised: 03/02/2023] [Accepted: 03/03/2023] [Indexed: 03/10/2023] Open
Abstract
The aim of this research was to evaluate the mechanical impact of utilizing different fiber-reinforced composite (FRC) systems to reinforce inlay-retained bridges in dissected lower molars with different levels of periodontal support. A total of 24 lower first molars and 24 lower second premolars were included in this study. The distal canal of all molars received endodontic treatment. After root canal treatment, the teeth were dissected, and only the distal halves were kept. Standardized class II occluso-distal (OD) (premolars) and mesio-occlusal (MO) (dissected molars) cavities were prepared in all teeth, and premolar–molar units were created. The units were randomly distributed among four groups (n = six/group). With the aid of a transparent silicone index, direct inlay-retained composite bridges were fabricated. In Groups 1 and 2, both discontinuous (everX Flow) and continuous (everStick C&B) fibers were used for reinforcement, while in Groups 3 and 4, only discontinuous fibers (everX Flow) were used. The restored units were embedded in methacrylate resin, simulating either physiological periodontal conditions or furcation involvement. Subsequently, all units underwent fatigue survival testing in a cyclic loading machine until fracture, or a total of 40,000 cycles. Kaplan–Meyer survival analyses were conducted, followed by pairwise log-rank post hoc comparisons. Fracture patterns were evaluated visually and with scanning electron microscopy. In terms of survival, Group 2 performed significantly better than Groups 3 and 4 (p < 0.05), while there was no significant difference between the other groups. In the case of impaired periodontal support, a combination of both continuous and discontinuous short FRC systems increased the fatigue resistance of direct inlay-retained composite bridges compared to bridges that only contained short fibers. Such a difference was not found in the case of sound periodontal support between the two different bridges.
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Brunner KC, Özcan M. Load bearing capacity and Weibull characteristics of inlay-retained resin-bonded fixed dental prosthesis made of all-ceramic, fiber-reinforced composite and metal-ceramic after cyclic loading. J Mech Behav Biomed Mater 2020; 109:103855. [PMID: 32543415 DOI: 10.1016/j.jmbbm.2020.103855] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2020] [Revised: 05/06/2020] [Accepted: 05/10/2020] [Indexed: 10/24/2022]
Abstract
PURPOSE The objectives of this study were to evaluate the load bearing capacity of RBFDPs made of different materials after cyclic loading, and classify the failure types after loading. MATERIALS AND METHODS Sound human mandibular first premolars and first molar pairs (N = 60 per tooth type, n = 10 per group) were randomly divided into six experimental groups to receive one of the following inlay-retained RBFDP types: RC: Resin composite only, DFRC: Direct E-glass fiber-reinforced composite (FRC), IFRC: Indirect E-glass FRC, LS: Lithium disilicate glass-ceramic, ZR: Yttria-stabilized tetragonal zirconia, MC: Metal-ceramic. Box preparations were made in abutment teeth using diamond burs followed by standardized ultrasonic burs. The teeth were conditioned employing an etch-and-rinse adhesive system and the indirect RBFDPs were cemented adhesively. The specimens were subjected to cyclic loading for x1.200.000 in distilled water alternating between 5 and 55 °C (Zurich Chewing Simulator). They were then loaded to failure from the occlusal surface in the Universal Testing Machine (cross-head speed: 1 mm/min). Failure types were classified as repairable or irreparable depending on the location and size. Data were analyzed using Welch and Tamhane's T2 post-hoc tests (α = 0.05). Weibull modulus for each group was calculated based on parametric distribution analysis of censored data for maximum fracture load. RESULTS Mean load bearing capacity (N) of Groups LS (1274 ± 270), ZR (1567 ± 363) and MC (1544 ± 787) were significantly higher than those of other groups (p < 0.05). RC, DFRC, IFRC (601 ± 130 - 819 ± 270) and MC did not show significant difference (p > 0.05). Weibull modulus (m) was the highest in Group LS (m = 5.3) followed by Group RC (m = 5.1). Other groups presented Weibull moduli ranging between 1.4 and 3.3. Only in Group ZR, 2 early debonding occurred during cyclic loading. While in this group predominantly irreparable failures (debonding with without tooth fracture) were observed (8 out of 10), all other groups presented mainly single or a combination of repairable failures (chipping in the veneering material). DFRC, IDRC and MC did not show any debonding from the abutment teeth. CONCLUSION Considering load bearing capacity, repairable failure types and Weibull moduli, lithium disilicate seem to be more durable than those of other material options for posterior inlay-retained RBFDPs. Due to early debondings and catastrophic irreparable failure types, zirconia RBFDPs should be indicated with caution in the posterior region.
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Affiliation(s)
- Kim-Chi Brunner
- University of Zürich, Center for Dental and Oral Medicine, Division of Dental Biomaterials, Clinic for Reconstructive Dentistry, Zurich, Switzerland
| | - Mutlu Özcan
- University of Zürich, Center for Dental and Oral Medicine, Division of Dental Biomaterials, Clinic for Reconstructive Dentistry, Zurich, Switzerland.
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Mousavi A, Aliha MRM, Imani DM. Effects of biocompatible Nanofillers on mixed-mode I and II fracture toughness of PMMA base dentures. J Mech Behav Biomed Mater 2020; 103:103566. [PMID: 32090956 DOI: 10.1016/j.jmbbm.2019.103566] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2019] [Revised: 11/27/2019] [Accepted: 11/28/2019] [Indexed: 10/25/2022]
Abstract
A modified single edge cracked bend beam specimen called "inclined edge crack asymmetric bend" (IE-CAB) specimen was designed and proposed for investigating mixed mode I/II fracture toughness behavior of brittle materials. Using a large number of finite element analyses performed for different geometry and loading conditions, it was demonstrated that unlike the conventional single edge notch beam specimen, the IE-CAB configuration can provide full combinations of mode mixities from pure mode I to pure mode II. Then the IE-CAB specimen was employed for mixed mode I/II fracture toughness testing of two PMMA based denture materials (i.e. neat PMMA and toughened PMMA with Nano-hydroxyapatite (HAP)and Nano-alumina (Al2O3) particles). The obtained experimental results showed that adding bio-compatible (HAP and Al2O3) Nano-particles can increase both modes I and II fracture resistance (KIc and KIIc) values of base PMMA denture. However, the influence of such particles was more pronounced on enhancing mode I fracture toughness (KIc) value. Pure mode II fracture toughness value was obtained less than the pure mode I fracture toughness in the tested specimen showing the higher crack growth risk of such PMMA base dentures against dominantly shear loads. The well-known maximum tangential stress theory was also used for estimating the obtained experimental data both for mixed mode fracture toughness and fracture initiation direction in the tested PMMA base denture materials.
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Affiliation(s)
- A Mousavi
- Welding and Joining Research Center, School of Industrial Engineering, Iran University of Science and Technology (IUST), Narmak, 16486-13114, Tehran, Iran
| | - M R M Aliha
- Welding and Joining Research Center, School of Industrial Engineering, Iran University of Science and Technology (IUST), Narmak, 16486-13114, Tehran, Iran.
| | - D M Imani
- Welding and Joining Research Center, School of Industrial Engineering, Iran University of Science and Technology (IUST), Narmak, 16486-13114, Tehran, Iran
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Almeida LND, Mendes GAM, Favarão IN, Kasuya AVB, Borges MG, Menezes MDS, Fonseca RB. Influence of preheating and post-curing on a novel fiber-reinforced composite post material. Braz Oral Res 2018; 32:e97. [PMID: 30379234 DOI: 10.1590/1807-3107bor-2018.vol32.0097] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2018] [Accepted: 06/27/2018] [Indexed: 11/22/2022] Open
Abstract
The aim of this study was to investigate the influence of preheating and post-curing methods on diametral tensile strength (DTS), flexural strength (FS), knoop microhardness (KHN), and degree of conversion (DC) of an experimental fiber-reinforced composite (FRC). Specimens (30 wt% of 3-mm-short E-glass fiber, 22.5 wt% of methacrylated-based resin and 47.5 wt% of filler particles) were subjected to: P - photocuring at 1500 mW/cm2 for 40 s (control); P/M - photocuring and microwave post-curing (540W/5 minutes); P/A - photocuring and autoclave post-curing (120°C/15 minutes); PH-P - preheating (60°C) and photocuring; PH-P/M - preheating, photocuring and microwave post-curing; and PH-P/A - preheating, photocuring and autoclave post-curing. Specimens for DTS (Ø 3 x 6 mm) and FS (25 x 2 x 2 mm) were tested at Instron 5965. KHN employed a 50g load for 30s. DC was measured using FTIR spectroscopy. Statistical analysis employed: factorial analysis, normality test, one-way ANOVA and Tukey's HSD test, independent T-test and the Dunnett test. Interaction between factors was not significant (P>0.05). Preheating promoted significantly higher values of FS and KHN (p = 0.0001). Post-curing promoted significantly higher values for KHN (p = 0.0001). For DTS (p = 0.066) and DC (p= 0.724) no statistical difference was found between groups. SEM images showed that preheating promoted better interaction between glass fibers and resin matrix. Preheating increased FS, KHN and DTS, and post-curing increased KHN. DC was not affected by both methods. Preheating and post-curing methods can be used to improve some mechanical properties of FRCs' but degree of conversion remains unaffected.
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Affiliation(s)
- Letícia Nunes de Almeida
- Universidade Federal de Goiás - UFG, Dentistry School, Department of Restorative and Operative Dentistry, Goiânia, GO, Brazil
| | - Gustavo Adolfo Martins Mendes
- Universidade Federal de Goiás - UFG, Dentistry School, Department of Restorative and Operative Dentistry, Goiânia, GO, Brazil
| | - Isabella Negro Favarão
- Universidade Federal de Goiás - UFG, Dentistry School, Department of Restorative and Operative Dentistry, Goiânia, GO, Brazil
| | - Amanda Vessoni Barbosa Kasuya
- Universidade do Oeste Paulista - Unoeste, Department of Restorative and Operative Dentistry School, Presidente Prudente, SP, Brazil
| | - Marcela Gonçalves Borges
- Universidade Federal de Uberlândia - UFU, Dentistry School, Department of Restorative and Operative Dentistry, Uberlândia, MG, Brazil
| | - Murilo de Sousa Menezes
- Universidade Federal de Uberlândia - UFU, Dentistry School, Department of Restorative and Operative Dentistry, Uberlândia, MG, Brazil
| | - Rodrigo Borges Fonseca
- Universidade Federal de Goiás - UFG, Dentistry School, Department of Restorative and Operative Dentistry, Goiânia, GO, Brazil
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Goguta LM, Candea A, Lungeanu D, Frandes M, Jivanescu A. Direct Fiber-Reinforced Interim Fixed Partial Dentures: Six-Year Survival Study. J Prosthodont 2018; 28:e604-e608. [PMID: 29323773 DOI: 10.1111/jopr.12751] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/19/2017] [Indexed: 11/27/2022] Open
Abstract
PURPOSE Mechanical and optical studies of glass fiber composites have revealed great resistance and satisfactory bonds between the glass fibers and composite resins. This study aimed to evaluate the long-term survival of anterior and posterior direct glass fiber-reinforced composite (FRC) fixed partial dentures (FPD). MATERIALS AND METHODS Twenty-three patients (9 men, 14 women) aged 18 to 67 received 23 d-FRC-FPDs. The frameworks of the FPDs were unidirectional pre-impregnated glass fibers (ever Stick C&B). The retainers were inlay composite resin retainers (n1 = 19) and composite resin wings (n2 = 4). The FPD that used inlay retainers and composite resin wing retainers was called the hybrid design. The mean follow-up period was 4.91 years with 12-month check-ups performed by two independent operators. The survival rates of the glass fiber FPDs were determined. RESULTS Six-year survival rates for the two types of FPDs were 94.7% for the inlay retainer type versus 25% for the hybrid type, with a statistically significant difference (log-rank test χ2 (1) = 11.422, p = 0.001). The inlay retainers were functional, with only one patient with a fracture line in the connector held by the glass fibers. Kaplan-Meier survival curves were drawn to show the difference between the two types of retainers. CONCLUSION According to the results of this study, these long-term interim FRC-FPD were resistant enough to allow mastication, minimally invasive and also esthetic, with inlay composite retainers as the better solution.
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Affiliation(s)
- Luciana Maria Goguta
- Department of Prosthodontics, University of Medicine and Pharmacy, Timisoara, Romania
| | - Adrian Candea
- Department of Prosthodontics, University of Medicine and Pharmacy, Timisoara, Romania
| | - Diana Lungeanu
- Department of Functional Sciences/Medical Informatics and Biostatistics, University of Medicine and Pharmacy, Timisoara, Romania
| | - Mirela Frandes
- Department of Functional Sciences/Medical Informatics and Biostatistics, University of Medicine and Pharmacy, Timisoara, Romania
| | - Anca Jivanescu
- Department of Prosthodontics, University of Medicine and Pharmacy, Timisoara, Romania
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All-ceramic inlay-retained fixed dental prostheses for replacing posterior missing teeth: A systematic review. J Prosthodont Res 2018; 62:10-23. [DOI: 10.1016/j.jpor.2017.06.007] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2016] [Revised: 04/14/2017] [Accepted: 06/28/2017] [Indexed: 11/22/2022]
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Cekic-Nagas I, Egilmez F, Ergun G, Vallittu PK, Lassila LVJ. Load-bearing capacity of novel resin-based fixed dental prosthesis materials. Dent Mater J 2017; 37:49-58. [PMID: 29081445 DOI: 10.4012/dmj.2016-367] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
To evaluate the influence of different materials on the load-bearing-capacity of inlay-retained fixed-dental-prosthesis (FDP). Ten types of FDPs were evaluated (n=7/group): Group PEEK: CAD-CAM polyetheretherketone (PEEK-TechnoMed), Group RC, made of discontinuous-fiber-composite (EverX Posterior); Group FRC1, made of discontinuous-fiber-composite (EverX Posterior) with two-bundles of continuous-unidirectional fiber-reinforced-composite (FRC) (Everstick C&B); Group FRC2, made of discontinuous-fiber-composite (EverX Posterior) with two-bundles of continuous-unidirectional-FRC (Everstick C&B) covered by two-pieces of short-unidirectional-FRC (Everstick C&B) placed perpendicular to the main-framework; Group FB, CAD-CAM fiber-block (Fibra-Composite Bio-C); Group PMMA, CAD-CAM polymethyl methacrylate block (Temp basic); Group RP, resin-paste; Group FRP1, made of resin-paste (G-Fix) with two-bundles of continuous-unidirectional-FRC (Everstick C&B); Group FRP2, made of resin-paste (G-Fix) two-bundles of continuous-unidirectional-FRC covered by two-pieces of short unidirectional-FRC placed perpendicular to the main-framework and Group exp-FRC, experimental CAD-CAM FRC. The bridges were statically-loaded until fracture. Fracture modes were visually examined. ANOVA revealed that significant differences were observed between FDP-materials (p<0.05). In addition, fiber addition to the framework significantly affected load-bearing-capacity (p<0.05).
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Affiliation(s)
- Isil Cekic-Nagas
- Department of Prosthodontics, Faculty of Dentistry, Gazi University
| | - Ferhan Egilmez
- Department of Prosthodontics, Faculty of Dentistry, Gazi University
| | - Gulfem Ergun
- Department of Prosthodontics, Faculty of Dentistry, Gazi University
| | - Pekka Kalevi Vallittu
- Department of Biomaterials Science and Turku Clinical Biomaterials Center -TCBC, Institute of Dentistry, University of Turku.,City of Turku, Welfare Division
| | - Lippo Veli Juhana Lassila
- Department of Biomaterials Science and Turku Clinical Biomaterials Center -TCBC, Institute of Dentistry, University of Turku
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He R, Niu F, Chang Q. The mechanical and tribological behaviors of PI composite filled with plasma treated UHMWPE fiber. SURF INTERFACE ANAL 2017. [DOI: 10.1002/sia.6272] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Runqin He
- School of Mechanical and Electrical Engineering; Ningbo Dahongying University; Ningbo ZheJiang Province China
| | - Fenglian Niu
- School of Mechanical and Electrical Engineering; Ningbo Dahongying University; Ningbo ZheJiang Province China
| | - Qiuxiang Chang
- School of Mechanical and Electrical Engineering; Ningbo Dahongying University; Ningbo ZheJiang Province China
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Five-year clinical outcome of posterior zirconia ceramic inlay-retained FDPs with a modified design. J Dent 2015; 43:1411-5. [DOI: 10.1016/j.jdent.2015.11.001] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2015] [Revised: 09/29/2015] [Accepted: 11/05/2015] [Indexed: 11/22/2022] Open
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Hesselbach J, Barth N, Lippe K, Schilde C, Kwade A. Process chain and characterisation of nanoparticle enhanced composite coatings. ADV POWDER TECHNOL 2015. [DOI: 10.1016/j.apt.2015.09.006] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Kumbuloglu O, Özcan M. Clinical survival of indirect, anterior 3-unit surface-retained fibre-reinforced composite fixed dental prosthesis: Up to 7.5-years follow-up. J Dent 2015; 43:656-63. [DOI: 10.1016/j.jdent.2015.04.006] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2013] [Revised: 04/09/2015] [Accepted: 04/10/2015] [Indexed: 10/23/2022] Open
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Inlay-retained fixed dental prosthesis: a clinical option using monolithic zirconia. Case Rep Dent 2014; 2014:629786. [PMID: 24963420 PMCID: PMC4055644 DOI: 10.1155/2014/629786] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2014] [Accepted: 05/05/2014] [Indexed: 11/18/2022] Open
Abstract
DIFFERENT INDIRECT RESTORATIONS TO REPLACE A SINGLE MISSING TOOTH IN THE POSTERIOR REGION ARE AVAILABLE IN DENTISTRY: traditional full-coverage fixed dental prostheses (FDPs), implant-supported crowns (ISC), and inlay-retained FDPs (IRFDP). Resin bonded FDPs represent a minimally invasive procedure; preexisting fillings can minimize tooth structure removal and give retention to the IRFDP, transforming it into an ultraconservative option. New high strength zirconia ceramics, with their stiffness and high mechanical properties, could be considered a right choice for an IRFDP rehabilitation. The case report presented describes an IRFDP treatment using a CAD/CAM monolithic zirconia IRFDP; clinical and laboratory steps are illustrated, according to the most recent scientific protocols. Adhesive procedures are focused on the Y-TZP and tooth substrate conditioning methods. Nice esthetic and functional integration of indirect restoration at two-year follow-up confirmed the success of this conservative approach.
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Barth N, Hesselbach J, Schilde C, Kwade A. Optimierung von Easy-to-Clean-Kompositbeschichtungen mithilfe hydrophober Nanopartikel. CHEM-ING-TECH 2014. [DOI: 10.1002/cite.201300110] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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