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Nasution H, Köseoğlu M, Sukotjo C. Effect of various surface treatment methods on shear bond strength between acrylic denture teeth and thermoplastic nylon denture base. J Prosthodont 2024. [PMID: 38858801 DOI: 10.1111/jopr.13892] [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: 01/18/2024] [Accepted: 05/28/2024] [Indexed: 06/12/2024] Open
Abstract
PURPOSE To evaluate the effect of mechanical, chemical, and mechanical-chemical surface treatment methods on shear bond strength between acrylic denture teeth and thermoplastic nylon denture base. MATERIALS AND METHODS Maxillary central incisor teeth were treated with five different surface treatment methods: mechanical (sandblasting, T-shape diatoric holes), chemical (5% acetic acid solution, bonding agent), and mechanical-chemical (sandblasting + bonding agent) were embedded in thermoplastic nylon denture base (n = 10). A universal testing machine with a crosshead speed of 0.5 mm per minute was used to test the shear bond strength. Data obtained were statistically evaluated using one-way ANOVA and followed with Tukey post hoc test (α = 0.05) RESULTS: T-shaped diatoric holes exhibited significantly higher shear bond strength among the surface treatment groups, followed by sandblasting + bonding agent, sandblasting, bonding agent, and the acetic acid group (p < 0.001) CONCLUSION: T-shaped diatoric holes as a mechanical surface treatment showed higher shear bond strength than other methods.
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Affiliation(s)
- Hubban Nasution
- Department of Prosthodontics, Faculty of Dentistry, Universitas Sumatera Utara, Medan, Indonesia
| | - Merve Köseoğlu
- Department of Prosthodontics, Faculty of Dentistry, University of Sakarya, Sakarya, Turkey
- Department of Prosthodontics, Ataturk University Faculty of Dentistry, Erzurum, Turkey
| | - Cortino Sukotjo
- Department of Restorative Dentistry, College of Dentistry, University of Illinois Chicago, Chicago, Illinois, USA
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İşisağ Ö. The effect of hydrofluoric acid treatment on the repair strength of polyamide denture base materials: An in vitro study. J Prosthodont 2023. [PMID: 37975406 DOI: 10.1111/jopr.13804] [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: 04/01/2023] [Revised: 11/10/2023] [Accepted: 11/14/2023] [Indexed: 11/19/2023] Open
Abstract
PURPOSE Although polymethylmethacrylate (PMMA) dentures can be repaired using autopolymerizing acrylic resin, achieving it using polyamides is difficult. This study aimed to achieve acceptable bond strength using autopolymerizing acrylic resin by applying surface treatments to the polyamide denture base material. MATERIALS AND METHODS Thirty-six disc-shaped samples (27 polyamide, 9 PMMA) were prepared. Based on the surface treatment applied, the polyamide samples were divided into three groups: No surface treatment (n = 9), tribochemical silica coating + silane coupling agent (n = 9), and 9% hydrofluoric acid + tribochemical silica coating +silane coupling agent (n = 9). PMMA specimens received no surface treatment. Polyamide and PMMA surfaces had auto-polymerizing acrylic resin bonded on them, and then a shear bond strength test was performed between them after aging. The Kruskal-Wallis test was used, and statistical significance was set at p < 0.05. RESULTS PMMA had the highest shear bond strength, the untreated polyamide group had the lowest shear bond strength, and the difference was significant (p < 0.05). The group treated with 9% hydrofluoric acid, tribochemical silica coating, and silane coupling agent exhibited the highest shear bond strength of the polyamide groups, and the bond strength in this group was comparable to the PMMA specimens (p > 0.05). CONCLUSIONS The polyamide denture repair strength can be improved by 9% hydrofluoric acid, tribochemical silica coating, and silane coupling agent application to the polyamide surface.
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Affiliation(s)
- Özer İşisağ
- Department of Prosthodontics, Afyonkarahisar University of Health Sciences Faculty of Dentistry, Afyonkarahisar, Turkey
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Patil S, Licari FW, Bhandi S, Awan KH, Badnjević A, Belli V, Cervino G, Minervini G. The Cytotoxic Effect of Thermoplastic Denture Base Resins: A Systematic Review. J Funct Biomater 2023; 14:411. [PMID: 37623656 PMCID: PMC10455636 DOI: 10.3390/jfb14080411] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2023] [Revised: 07/06/2023] [Accepted: 07/14/2023] [Indexed: 08/26/2023] Open
Abstract
Partial or complete dentures are constructed from thermoplastic resins that are thermally processed and molded. This review examines the presently available evidence for the cytotoxicity of thermoplasticized denture base resins on human gingival epithelial cells, adipose cells, and fibroblasts; human amnion fibroblasts; and mouse fibroblasts. Electronic searches were performed on PubMed, Scopus, Web of Science, and Google Scholar databases to identify relevant articles to be included in the review until September 2022. Clinical, in vivo, and in vitro studies in English language were searched for. The quality of the studies was assessed using the Toxicological data Reliability Assessment tool (ToxRTool) developed by the European Commission's Joint Research Centre. GRADE assessment was used to evaluate the certainty of evidence. Seven in vitro studies were included in the review. The overall risk of bias was determined to be high, with the majority of studies assessed found to be reliable with restrictions or not reliable. Only two studies were considered reliable without restrictions based on ToxRTool assessment. The effect of thermoplastic denture base resins on viability and cell adherence of human gingival or amnion fibroblasts and mouse fibroblasts (L929s) is not significant. Conditioned media from unpolished specimens of resins were significantly more toxic to cultured cells than those from polished specimens. This may be of concern in cases of poor post-processing of dentures. Based on the limited evidence available, there is low-certainty evidence that thermoplastic denture base resins appear to be biocompatible and show insignificant cytotoxicity. Further well-designed trials adhering to standard reporting guidelines and using objective measures are necessary before outlining universal guidelines for best practice. Long-term in vivo and clinical assessment is necessary to corroborate laboratory findings with clinical outcomes. Denture base resins are in constant contact with oral tissues, and cytotoxic components released by the resins may irritate or inflame the tissues or provoke an allergic response.
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Affiliation(s)
- Shankargouda Patil
- College of Dental Medicine, Roseman University of Health Sciences, South Jordan, UT 84095, USA (S.B.)
| | - Frank W. Licari
- College of Dental Medicine, Roseman University of Health Sciences, South Jordan, UT 84095, USA (S.B.)
| | - Shilpa Bhandi
- College of Dental Medicine, Roseman University of Health Sciences, South Jordan, UT 84095, USA (S.B.)
| | - Kamran H. Awan
- College of Dental Medicine, Roseman University of Health Sciences, South Jordan, UT 84095, USA (S.B.)
| | - Almir Badnjević
- Verlab Research Institute for Biomedical Engineering, Medical Devices and Artificial Intelligence, 71000 Sarajevo, Bosnia and Herzegovina;
| | - Valentina Belli
- Department of Precision Medicine, Università degli Studi della Campania “Luigi Vanvitelli”, 80131 Naples, Italy
| | - Gabriele Cervino
- Department of Biomedical and Dental Sciences, Morphological and Functional Images, University of Messina, G. Martino Polyclinic, 98100 Messina, Italy
| | - Giuseppe Minervini
- Multidisciplinary Department of Medical-Surgical and Dental Specialties, University of Campania, Luigi Vanvitelli, 80138 Naples, Italy;
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Gokay GD, Durkan R, Oyar P. Evaluation of physical properties of polyamide and methacrylate based denture base resins polymerized by different techniques. Niger J Clin Pract 2021; 24:1835-1840. [PMID: 34889793 DOI: 10.4103/njcp.njcp_469_20] [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: 11/04/2022]
Abstract
Aim This study aims to comparatively evaluate the flexural strength, internal adaptation, elastic modulus, and maximum deflection of a newly introduced, strengthened injection-molded semi-flexed polyamide resin (Deflex) and a conventional heat-cured resin containing cross-linking polymethyl methacrylate denture base polymers (QC-20). Materials and Methods A vinyl polysiloxane film replicating the gap between the denture base and the metallic master model of an edentulous maxilla was weighed using an analytical balance with an accuracy of 0.0001 g for the measurement of internal adaptation. The measurements were performed immediately after surface finishing. Seven rectangular test samples measuring 65 × 10 × 3.3 mm3 were set up for flexural strength test. Flexural strength test (three-point bending test) was performed using a universal machine under axial load at a crosshead speed of 5 mm/min. One-way ANOVA (α = 0.05) following by t tests was utilized in statistical analysis. Results The difference between the flexural strength of the denture base resins of Deflex and QC-20 was found to be statistically significant. The injection-molded resin demonstrated better internal adaptation compared to the conventional heat-polymerized resin. Evaluation of the physical test results revealed that the polyamide samples were more flexible than polymethyl methacrylate and did not break during flexural strength tests. Conclusion Some properties of denture base resins, such as resin types, internal adaptation, and mechanical strength, may play a significant role in clinical performance of complete dentures and removable partial prostheses. Because of the superior flexural strength properties and internal adaptation characteristics, Deflex may prove to be a useful alternative to conventional denture base resin.
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Affiliation(s)
- G Deste Gokay
- Department of Prosthodontics, Faculty of Dentistry, Bursa Uludağ University, Bursa, Turkey
| | - R Durkan
- Department of Prosthodontics, Faculty of Dentistry, Istanbul Okan University, Istanbul, Turkey
| | - P Oyar
- Department of Dental Prostheses Technology, Health Services Vocational High School, Hacettepe University, Ankara, Turkey
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Dandekeri S, Mohandas S, Shetty SK, Ragher M, Rasheed M, Raj N. A Study to Assess the Bond Strength of Acrylic Teeth With Different Retentive Features. J Pharm Bioallied Sci 2020; 12:S510-S516. [PMID: 33149513 PMCID: PMC7595539 DOI: 10.4103/jpbs.jpbs_148_20] [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: 02/07/2020] [Revised: 03/02/2020] [Accepted: 03/09/2020] [Indexed: 11/08/2022] Open
Abstract
Background and Aim: Flexible denture base has been gaining attention as a denture base material because of its toxicological safety, comfort, and enhanced aesthetics. Debonding of acrylic teeth from the flexible denture base material has posed a great problem to the clinician and patient. This study aimed at comparing the bond strength between flexible denture base with acrylic teeth having different mechanical modifications. Materials and Methods: Forty mandibular molar teeth (Combination Acry Rock, Badia Polesine (Ro), Italy) were used in four groups for mechanical modifications on the ridge lap area. The groups were group 1 (no mechanical modifications), group 2 (round groove 2 mm in diameter and 2 mm deep on the ridge lap surface), group 3 (horizontal slot 2 mm deep, 2 mm wide, and 4 mm long prepared on the ridge lap surface of the teeth), and group 4 (T-shaped groove 2 mm deep, 2 mm wide, and length of 4 mm mesiodistally and 2 mm buccolingually prepared with a straight fissure bur). The acrylic teeth were attached to a wax block of dimension 1.2 cm × 1.2 cm × 2.5 cm. These were flasked and dewaxed, followed by injection molding with Valplast flexible denture base material. The bond strength was assessed by attaching the specimens to universal testing machine tested under a tensile load at a cross-head speed of 1 mm/min till it fractured. Data obtained were statistically evaluated by one-way analysis of variance and post hoc test. Results: There was significant increase in mean bond strength after various mechanical modifications. Group with T-shaped diatoric hole showed greatest bond strength value compared to other groups. Conclusion: Incorporating mechanical retentive features with increased surface area and undercut can improve the bonding of acrylic teeth to flexible denture base.
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Affiliation(s)
- Savita Dandekeri
- Department of Prosthodontics, Yenepoya Dental College, Mangalore, Karnataka, India
| | - Smrithi Mohandas
- Department of Oral Medicine & Radiology, Mahe Institute of Dental Sciences and Hospital, Mahe, Puducherry, India
| | - Sanath K Shetty
- Department of Prosthodontics, Yenepoya Dental College, Mangalore, Karnataka, India
| | - Mallikarjuna Ragher
- Department of Prosthodontics, Yenepoya Dental College, Mangalore, Karnataka, India
| | - Mohammed Rasheed
- Department of Prosthodontics, Yenepoya Dental College, Mangalore, Karnataka, India
| | - Nikhil Raj
- Department of Oral Medicine & Radiology, Mahe Institute of Dental Sciences and Hospital, Mahe, Puducherry, India
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Influence of Various Chemical Surface Treatments, Repair Materials, and Techniques on Transverse Strength of Thermoplastic Nylon Denture Base. Int J Dent 2020; 2020:8432143. [PMID: 32963534 PMCID: PMC7499321 DOI: 10.1155/2020/8432143] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2020] [Revised: 08/21/2020] [Accepted: 08/30/2020] [Indexed: 11/18/2022] Open
Abstract
The process of repairing the fractured nylon denture bases and addition of acrylic teeth to the previously worn nylon denture bases has not been widely studied. This study aims to assess the transverse strength of nylon denture bases repaired by various resin materials, different curing techniques, and types of surface treatments. Materials and Methods. One hundred fifty thermoplastic nylon denture base samples were fabricated using plastic patterns measuring 65 × 10 × 2.5 mm (length, width, and thickness, respectively). These samples were then divided into three equal groups. Fifty samples were repaired by microwave heat-polymerization, fifty samples were repaired using the Ivomate autopolymerization, and the other fifty were repaired using light-polymerized acrylic resin. Each of these three groups was further divided into five subgroups of ten samples based on the type of surface treatment. The samples in the control group did not undergo any surface treatment, and the other four groups were chemically surface treated with monomer, acetone, ethyl acetate, and isopropanol, respectively. A three-point bending test was used to calculate the transverse strength values of the samples. Fourier transform infrared (FTIR) analysis was conducted to determine the component of functional groups between the polyamide nylon base and poly(methyl-methacrylate) PMMA repair materials. A polarizing microscope was utilized to investigate the mode of failure at the fracture surfaces. Results. The collected data were analyzed with one-way ANOVA and Sidak's multiple comparison test to show the differences among different groups. For surface treatments, the highest transverse strength values were obtained by monomer-treated samples (18.29 N/mm2); however, the lowest values were obtained in non-surface treated samples (5.58 N/mm2). While for repair techniques, the highest transverse strength values were obtained by microwave processing, followed by Ivomate and then the light-cured polymerization. The means were found to be significant (p < 0.001). FTIR analysis shows the presence of hydrogen bonding which is due to the ester and amid groups which enhance the bond strength of the surface-treated samples. The interface of the polarizing microscope images revealed a cohesive fracture within repair materials rather than the adhesive nature. Conclusion. The microwave-polymerized resin was considered as the most effective repair technique along with monomer chemical etchant which creates a tight adhesion between PMMA and nylon denture base in comparison to other groups.
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Mendoza-Carrasco I, Hotta J, Sugio CYC, Procópio ALF, Urban VM, Mosquim V, Foratori-Junior GA, Soares S, Neppelenbroek KH. Nonmetal clasp dentures: What is the evidence about their use? J Indian Prosthodont Soc 2020; 20:278-284. [PMID: 33223697 PMCID: PMC7654199 DOI: 10.4103/jips.jips_459_19] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2019] [Revised: 04/27/2020] [Accepted: 06/04/2020] [Indexed: 11/21/2022] Open
Abstract
The aim was to discuss the indications, contraindications, advantages, and disadvantages of Nonmetal clasp dentures (NMCDs), as well as the most relevant properties of its constituent materials. A search was conducted using the keywords: “nonmetal clasp dentures,” “thermoplastic resin,” “flexible resin removable partial denture,” “polyamide,” and “nylon” in databases PubMed/Medline, Lilacs, SciELO, and textbooks between 1955 and 2020. Theses and texts without reliable sources of publication were excluded. Once the analysis instruments were determined, the data were analyzed and discussed. NMCDs present high flexibility, easy adaptation to the abutments, color compatibility and biocompatibility with the oral mucosa, and absence of visible metal clasps. However, they need laboratory relining, grinding, and polishing, do not have criteria for its planning, become rougher and stained over time, and are able to traumatize supporting tissues. The association with metal components seems to be an alternative to increase the success of NMCDs by combining esthetics and biomechanical principles of conventional removable partial dentures. The lack of long-term clinical studies makes the professionals to rely solely on previous experiences or on the manufacturers' recommendations. It suggested that NMCDs must be indicated with caution when not used temporarily.
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Affiliation(s)
- Inti Mendoza-Carrasco
- Department of Prosthodontics and Periodontics, Bauru School of Dentistry, University of São Paulo, Bauru, São Paulo, Brazil
| | - Juliana Hotta
- Department of Prosthodontics and Periodontics, Bauru School of Dentistry, University of São Paulo, Bauru, São Paulo, Brazil
| | - Carolina Yoshi Campos Sugio
- Department of Prosthodontics and Periodontics, Bauru School of Dentistry, University of São Paulo, Bauru, São Paulo, Brazil
| | - Andréa Lemos Falcao Procópio
- Department of Prosthodontics and Periodontics, Bauru School of Dentistry, University of São Paulo, Bauru, São Paulo, Brazil
| | | | - Victor Mosquim
- Department of Operative Dentistry, Endodontics and Dental Materials, Bauru School of Dentistry, University of São Paulo, Bauru, São Paulo, Brazil
| | - Gerson Aparecido Foratori-Junior
- Department of Pediatric Dentistry, Orthodontics and Public Health, Bauru School of Dentistry, University of São Paulo, Bauru, São Paulo, Brazil
| | - Simone Soares
- Department of Prosthodontics and Periodontics, Bauru School of Dentistry, University of São Paulo, Bauru, São Paulo, Brazil
| | - Karin Hermana Neppelenbroek
- Department of Prosthodontics and Periodontics, Bauru School of Dentistry, University of São Paulo, Bauru, São Paulo, Brazil
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Manzon L, Fratto G, Poli O, Infusino E. Patient and Clinical Evaluation of Traditional Metal and Polyamide Removable Partial Dentures in an Elderly Cohort. J Prosthodont 2019; 28:868-875. [DOI: 10.1111/jopr.13102] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/30/2019] [Indexed: 11/27/2022] Open
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Song SY, Kim KS, Lee JY, Shin SW. Physical properties and color stability of injection-molded thermoplastic denture base resins. J Adv Prosthodont 2019; 11:32-40. [PMID: 30847047 PMCID: PMC6400709 DOI: 10.4047/jap.2019.11.1.32] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2018] [Revised: 12/03/2018] [Accepted: 01/21/2019] [Indexed: 11/12/2022] Open
Abstract
PURPOSE The purpose of this study was to compare mechanical and physical properties of injection-molded thermoplastic denture base resins. MATERIALS AND METHODS In this study, six commercially available products (VA; Valplast, LC; Lucitone, ST; Smiltone, ES; Estheshot-Bright, AC; Acrytone, WE; Weldenz) were selected from four types of thermoplastic denture base materials (Polyamide, Polyester, Acrylic resin and Polypropylene). The flexural properties and shore D hardness have been investigated and water sorption and solubility, and color stability have evaluated. RESULTS For the flexural modulus value, ES showed the highest value and WE showed significantly lower value than all other groups (P<.05). Most of experimental groups showed weak color stability beyond the clinically acceptable range. CONCLUSION Within the limits of this study, thermoplastic denture base resin did not show sufficient modulus to function as a denture base. In addition, all resins showed discoloration with clinical significance, and especially polyamides showed the lowest color stability.
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Affiliation(s)
- So-Yeon Song
- Department of Biomedical Science, Graduate School of Korea University, Seoul, Republic of Korea.,Institute for Clinical Dental Research, Korea University Medical Center, Republic of Korea
| | - Kyoung-Soo Kim
- Department of Medicine, Graduate School of Korea University, Seoul, Republic of Korea
| | - Jeong-Yol Lee
- Department of Advanced Prosthodontics, Korea University Guro Hospital, Seoul, Republic of Korea
| | - Sang-Wan Shin
- Doctor of Medicine, Korea University, Seoul, Republic of Korea
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Yamazaki T, Murakami N, Suzuki S, Handa K, Yatabe M, Takahashi H, Wakabayashi N. Influence of block-out on retentive force of thermoplastic resin clasps: an in vitro experimental and finite element analysis. J Prosthodont Res 2019; 63:303-308. [PMID: 30704930 DOI: 10.1016/j.jpor.2019.01.002] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2018] [Revised: 01/01/2019] [Accepted: 01/08/2019] [Indexed: 10/27/2022]
Abstract
PURPOSE The purpose of this study was to determine the effect of block-out preparation, used to eliminate the undercut area, on the retentive force and stress distribution of resin clasps. METHODS A total of 72 polyester and polyamide resin clasps were fabricated on a premolar abutment crown following six block-out preparations. A combination of two types of vertical block-outs and three types of horizontal block-outs (on the missing side) was used on the abutment tooth. Each clasp was subjected to an in vitro removal test using a universal testing machine. The retentive force and traces of the clasp on the abutment tooth were recorded and analyzed with one-way analysis of variance and post hoc comparisons (α=0.05). Non-linear finite element analysis was performed to assess the stress distributions of the resin clasps. RESULTS Resin clasps with a vertical block-out of 0.75mm undercut showed significantly higher retentive force than those with the 0.5mm undercut. Resin clasps with horizontal block-out showed significantly lower retentive force than those without horizontal block-out. There was no significant difference between the two thermoplastic resins. The maximum first principal stress of the resin clasp was concentrated under the shoulder of the clasp and strongly influenced by the width of horizontal block-out in the finite element analysis. CONCLUSIONS This in vitro experiment suggested that a horizontal block-out is necessary even for a 0.5-mm undercut. The design of the resin clasp should be considered from two aspects: retentive force and deformation risk.
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Affiliation(s)
- Toshiki Yamazaki
- Removable Partial Prosthodontics, Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| | - Natsuko Murakami
- Removable Partial Prosthodontics, Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan.
| | - Shizuka Suzuki
- Removable Partial Prosthodontics, Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| | - Kazuyuki Handa
- Removable Partial Prosthodontics, Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| | - Masaru Yatabe
- Removable Partial Prosthodontics, Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| | - Hidekazu Takahashi
- Oral Biomaterials Development Engineering, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| | - Noriyuki Wakabayashi
- Removable Partial Prosthodontics, Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
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Sun Y, Song SY, Lee KS, Park JH, Ryu JJ, Lee JY. Effects of relining materials on the flexural strength of relined thermoplastic denture base resins. J Adv Prosthodont 2018; 10:361-366. [PMID: 30370027 PMCID: PMC6202434 DOI: 10.4047/jap.2018.10.5.361] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2017] [Revised: 07/05/2018] [Accepted: 08/22/2018] [Indexed: 01/17/2023] Open
Abstract
PURPOSE The aim of this study was to evaluate the effects of relining materials on the flexural strength of relined thermoplastic denture base resins (TDBRs). MATERIALS AND METHODS For shear bond strength testing, 120 specimens were fabricated using four TDBRs (EstheShot-Bright, Acrytone, Valplast, Weldenz) that were bonded with three autopolymerizing denture relining resins (ADRRs: Vertex Self-Curing, Tokuyama Rebase, Ufi Gel Hard) with a bond area of 6.0 mm in diameter and were assigned to each group (n=10). For flexural strength testing, 120 specimens measuring 64.0×10.0×3.3 mm (ISO-1567:1999) were fabricated using four TDBRs and three ADRRs and were assigned to each group (n=10). The thickness of the specimens measured 2.0 mm of TDBR and 1.3 mm of ADRR. Forty specimens using four TDBRs and 30 specimens using ADRRs served as the control. All specimens were tested on a universal testing machine. For statistical analysis, Analysis of variance (ANOVA) with Tukey's test as post hoc and Spearman's correlation coefficient analysis (P=.05) were performed. RESULTS Acry-Tone showed the highest shear bond strength, while Weldenz demonstrated the lowest bond strength between TDBR and ADRRs compared to other groups. EstheShot-Bright exhibited the highest flexural strength, while Weldenz showed the lowest flexural strength. Relined EstheShot-Bright demonstrated the highest flexural strength and relined Weldenz exhibited the lowest flexural strength (P<.05). Flexural strength of TDBRs (P=.001) and shear bond strength (P=.013) exhibited a positive correlation with the flexural strength of relined TDBRs. CONCLUSION The flexural strength of relined TDBRs was affected by the flexural strength of the original denture base resins and bond strength between denture base resins and relining materials.
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Affiliation(s)
- Yunhan Sun
- Department of Medicine, Graduate School, Korea University, Seoul, Republic of Korea
| | - So-Yeon Song
- Department of Biomedical Sciences, Graduate School, Korea University, Seoul, Republic of Korea
| | - Ki-Sun Lee
- Department of Prosthodontics, Korea University Guro Hospital, Seoul, Republic of Korea
| | - Jin-Hong Park
- Department of Prosthodontics, Korea University Guro Hospital, Seoul, Republic of Korea
| | - Jae-Jun Ryu
- Department of Prosthodontics, Korea University Guro Hospital, Seoul, Republic of Korea
| | - Jeong-Yol Lee
- Department of Prosthodontics, Korea University Guro Hospital, Seoul, Republic of Korea
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Polychronakis N, Sarafianou A, Zissis A, Papadopoulos T. The Influence of Thermocycling on the Flexural Strength of a Polyamide Denture Base Material. Acta Stomatol Croat 2017; 51:309-315. [PMID: 29872236 PMCID: PMC5975457 DOI: 10.15644/asc51/4/5] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
Abstract
Objective The aim of the present study was to evaluate the influence of thermocycling on the flexural strength of a polyamide base denture material. Materials and methods A polyamide denture base material (Valplast) was tested, whereas a PMMA material (Vertex) was used as a control. Thirty specimens of each material were fabricated for flexural strength testing according to ISO 1567. They were prepared and stored in water at 37°C for 48 hours. The specimens of each material were divided into three equal groups (n=10). Flexural strength testing was performed immediately after water storage and after thermocycling (5°C / 55°C, 2 c/min) for 3000 and 5000 cycles. A three point flexural test was performed on a universal testing machine at a crosshead speed of 5 mm/min. The final flexural strength was calculated using the formula: FS = 3 PL/2 bd2. A two-way ANOVA with post-hoc analysis using Tukey's procedure was applied at .05 level of statistical significance. Results A statistically significant reduction in flexural strength was recorded after thermocycling at 3000 cycles for PMMA and at 5000 cycles for both materials. The flexural strength of PMMA was significantly higher compared to polyamide for all the conditions tested (p<0.05). Conclusion Thermocycling had a significant adverse effect on the flexural strength of polyamide and PMMA denture base materials.
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Affiliation(s)
- Nick Polychronakis
- Removable Prosthodontics, Dental School, National and Kapodistrian University of Athens, Greece
| | - Aspasia Sarafianou
- Department of Prosthodontics, Dental School, National and Kapodistrian University of Athens, Greece
| | - Alcibiadis Zissis
- Removable Prosthodontics, Dental School, National and Kapodistrian University of Athens, Greece
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Çulhaoğlu AK, Özkır SE, Şahin V, Yılmaz B, Kılıçarslan MA. Effect of Various Treatment Modalities on Surface Characteristics and Shear Bond Strengths of Polyetheretherketone‐Based Core Materials. J Prosthodont 2017; 29:136-141. [DOI: 10.1111/jopr.12702] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/08/2017] [Indexed: 11/30/2022] Open
Affiliation(s)
| | - Serhat Emre Özkır
- Department of ProsthodonticsAfyon Kocatepe University School of Dentistry Afyonkarahisar Turkey
| | - Volkan Şahin
- Faculty of Dentistry, Department of ProsthodonticsKırıkkale University Kırıkkale Turkey
| | - Burak Yılmaz
- Department of Restorative Dentistry and ProsthodonticsThe Ohio State University College of Dentistry Columbus OH
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Hafezeqoran A, Koodaryan R. Double-Layer Surface Modification of Polyamide Denture Base Material by Functionalized Sol-Gel Based Silica for Adhesion Improvement. J Prosthodont 2017; 28:701-708. [PMID: 28940932 DOI: 10.1111/jopr.12633] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/18/2017] [Indexed: 11/29/2022] Open
Abstract
PURPOSE Limited surface treatments have been proposed to improve the bond strength between autopolymerizing resin and polyamide denture base materials. Still, the bond strength of autopolymerizing resins to nylon polymer is not strong enough to repair the fractured denture effectively. This study aimed to introduce a novel method to improve the adhesion of autopolymerizing resin to polyamide polymer by a double layer deposition of sol-gel silica and N-2-(aminoethyl)-3-aminopropyltrimethoxysilane (AE-APTMS). MATERIALS AND METHODS The silica sol was synthesized by acid-catalyzed hydrolysis of tetraethylorthosilicate (TEOS) as silica precursors. Polyamide specimens were dipped in TEOS-derived sol (TS group, n = 28), and exposed to ultraviolet (UV) light under O2 flow for 30 minutes. UV-treated specimens were immersed in AE-APTMS solution and left for 24 hours at room temperature. The other specimens were either immersed in AE-APTMS solution (AP group, n = 28) or left untreated (NT group, n = 28). Surface characterization was investigated by fourier transform infrared spectroscopy (FTIR) and atomic force microscopy (AFM). Two autopolymerizing resins (subgroups G and T, n = 14) were bonded to the specimens, thermocycled, and then tested for shear bond strength with a universal testing machine. Data were analyzed with one-way ANOVA followed by Tukey's HSD (α = 0.05). RESULTS FTIR spectra of treated surfaces confirmed the chemical modification and appearance of functional groups on the polymer. One-way ANOVA revealed significant differences in shear bond strength among the study groups. Tukey's HSD showed that TST and TSG groups had significantly higher shear bond strength than control groups (p = 0.001 and p < 0.001, respectively). Moreover, bond strength values of APT were statistically significant compared to controls (p = 0.017). CONCLUSION Amino functionalized TEOS-derived silica coating is a simple and cost-effective method for improving the bond strength between the autopolymerizing resin and polyamide denture base. CLINICAL IMPLICATIONS Amino-functionalized silica coating could represent a more applicable and convenient option for improving the repair strength of autopolymerizing resin to polyamide polymer.
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Affiliation(s)
- Ali Hafezeqoran
- Department of Prosthodontics, Faculty of Dentistry, University of Medical Sciences, Tabriz, Iran
| | - Roodabeh Koodaryan
- Department of Prosthodontics, Faculty of Dentistry, University of Medical Sciences, Tabriz, Iran
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15
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Nasution H, Kamonkhantikul K, Arksornnukit M, Takahashi H. Pressure transmission area and maximum pressure transmission of different thermoplastic resin denture base materials under impact load. J Prosthodont Res 2017; 62:44-49. [PMID: 28606420 DOI: 10.1016/j.jpor.2017.05.001] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2016] [Revised: 05/02/2017] [Accepted: 05/18/2017] [Indexed: 11/18/2022]
Abstract
PURPOSES The purposes of the present study were to examine the pressure transmission area and maximum pressure transmission of thermoplastic resin denture base materials under an impact load, and to evaluate the modulus of elasticity and nanohardness of thermoplastic resin denture base. METHODS Three injection-molded thermoplastic resin denture base materials [polycarbonate (Basis PC), ethylene propylene (Duraflex), and polyamide (Valplast)] and one conventional heat-polymerized acrylic resin (PMMA, SR Triplex Hot) denture base, all with a mandibular first molar acrylic resin denture tooth set in were evaluated (n=6). Pressure transmission area and maximum pressure transmission of the specimens under an impact load were observed by using pressure-sensitive sheets. The modulus of elasticity and nanohardness of each denture base (n=10) were measured on 15×15×15×3mm3 specimen by using an ultramicroindentation system. The pressure transmission area, modulus of elasticity, and nanohardness data were statistically analyzed with 1-way ANOVA, followed by Tamhane or Tukey HSD post hoc test (α=.05). The maximum pressure transmission data were statistically analyzed with Kruskal-Wallis H test, followed by Mann-Whitney U test (α=.05). RESULTS Polymethyl methacrylate showed significantly larger pressure transmission area and higher maximum pressure transmission than the other groups (P<.001). Significant differences were found in modulus of elasticity and nanohardness among the four types of denture bases (P<.001). CONCLUSIONS Pressure transmission area and maximum pressure transmission varied among the thermoplastic resin denture base materials. Differences in the modulus of elasticity and nanohardness of each type of denture base were demonstrated.
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Affiliation(s)
- Hubban Nasution
- Department of Prosthodontics, Faculty of Dentistry, Chulalongkorn University, Bangkok, Thailand
| | - Krid Kamonkhantikul
- Department of Prosthodontics, Faculty of Dentistry, Chulalongkorn University, Bangkok, Thailand
| | - Mansuang Arksornnukit
- Department of Prosthodontics, Faculty of Dentistry, Chulalongkorn University, Bangkok, Thailand.
| | - Hidekazu Takahashi
- Oral Biomaterials Engineering, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
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16
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Koodaryan R, Hafezeqoran A. Effect of surface treatment methods on the shear bond strength of auto-polymerized resin to thermoplastic denture base polymer. J Adv Prosthodont 2016; 8:504-510. [PMID: 28018569 PMCID: PMC5179490 DOI: 10.4047/jap.2016.8.6.504] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2016] [Revised: 08/16/2016] [Accepted: 09/28/2016] [Indexed: 12/01/2022] Open
Abstract
PURPOSE Polyamide polymers do not provide sufficient bond strength to auto-polymerized resins for repairing fractured denture or replacing dislodged denture teeth. Limited treatment methods have been developed to improve the bond strength between auto-polymerized reline resins and polyamide denture base materials. The objective of the present study was to evaluate the effect of surface modification by acetic acid on surface characteristics and bond strength of reline resin to polyamide denture base. MATERIALS AND METHODS 84 polyamide specimens were divided into three surface treatment groups (n=28): control (N), silica-coated (S), and acid-treated (A). Two different auto-polymerized reline resins GC and Triplex resins were bonded to the samples (subgroups T and G, respectively, n=14). The specimens were subjected to shear bond strength test after they were stored in distilled water for 1 week and thermo-cycled for 5000 cycles. Data were analyzed with independent t-test, two-way analysis of variance (ANOVA), and Tukey's post hoc multiple comparison test (α=.05). RESULTS The bond strength values of A and S were significantly higher than those of N (P<.001 for both). However, statistically significant difference was not observed between group A and group S. According to the independent Student's t-test, the shear bond strength values of AT were significantly higher than those of AG (P<.001). CONCLUSION The surface treatment of polyamide denture base materials with acetic acid may be an efficient and cost-effective method for increasing the shear bond strength to auto-polymerized reline resin.
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Affiliation(s)
- Roodabeh Koodaryan
- Department of Prosthodontics, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Ali Hafezeqoran
- Department of Prosthodontics, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran
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17
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Zakir M, Ashraf U, Tian T, Han A, Qiao W, Jin X, Zhang M, Tsoi JKH, Matinlinna JP. The Role of Silane Coupling Agents and Universal Primers in Durable Adhesion to Dental Restorative Materials - a Review. ACTA ACUST UNITED AC 2016. [DOI: 10.1007/s40496-016-0108-9] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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18
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Hamanaka I, Iwamoto M, Lassila LVJ, Vallittu PK, Takahashi Y. Wear resistance of injection-molded thermoplastic denture base resins. ACTA BIOMATERIALIA ODONTOLOGICA SCANDINAVICA 2016. [PMID: 28642909 PMCID: PMC5433203 DOI: 10.3109/23337931.2015.1135747] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Objective This study investigated the wear resistance of injection-molded thermoplastic denture base resins using nanoindentation instrument. Materials and methods Six injection-molded thermoplastic denture base resins (two polyamides, two polyesters, one polycarbonate, one polymethylmethacrylate [PMMA]) and a PMMA conventional heat-polymerized denture-based polymer control were tested. Elastic modulus, hardness, wear depth, and roughness were calculated using a nanoindentation instrument. Results Elastic modulus and hardness of the injection-molded thermoplastic denture base resins were significantly lower than those of the PMMA conventional heat-polymerized denture-based polymer. Wear depth of polycarbonate and PMMA conventional heat-polymerized denture-based polymer were significantly higher than that of other injection-molded thermoplastic denture base resins. The roughness of injection-molded thermoplastic denture base resins was significantly more than that of PMMA conventional heat-polymerized denture-based polymer after testing. Conclusions Wear resistance of injection-molded thermoplastic denture base was low compared to PMMA conventional heat-polymerized denture-based polymers.
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Affiliation(s)
- Ippei Hamanaka
- Division of Removable Prosthodontics, Fukuoka Dental CollegeFukuokaJapan
| | - Misa Iwamoto
- Division of Removable Prosthodontics, Fukuoka Dental CollegeFukuokaJapan
| | - Lippo V J Lassila
- Department of Biomaterials Science, Turku Clinical Biomaterials Centre - TCBC, Institute of Dentistry, University of TurkuTurkuFinland
| | - Pekka K Vallittu
- Department of Biomaterials Science, Turku Clinical Biomaterials Centre - TCBC, Institute of Dentistry, University of TurkuTurkuFinland.,Division for Welfare, City of TurkuTurkuFinland
| | - Yutaka Takahashi
- Division of Removable Prosthodontics, Fukuoka Dental CollegeFukuokaJapan
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19
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Iwata Y. Assessment of clasp design and flexural properties of acrylic denture base materials for use in non-metal clasp dentures. J Prosthodont Res 2016; 60:114-22. [PMID: 26769352 DOI: 10.1016/j.jpor.2015.11.003] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2015] [Revised: 10/25/2015] [Accepted: 11/03/2015] [Indexed: 11/17/2022]
Abstract
PURPOSE The purpose of this study was to investigate the possibilities of utilizing new acrylic denture base materials in resin clasps using three-point flexural tests and cantilever beam tests. METHODS Seven non-metal clasp denture (NMCD) materials and four acrylic denture base materials were used for three-point flexural tests and six NMCD materials and three acrylic denture base materials were used for cantilever beam tests. The flexural strength, elastic modulus, and 0.05% proof stress were measured by three-point flexural tests according to International Organization for Standardization (ISO) 20795-1. And load at 0.5mm deformation, elastic modulus were measured by Cantilever beam tests. RESULTS For the three-point flexural tests, only materials that met the conditions for both flexural strength and elastic modulus were the polycarbonate Reigning N (REN) and the acrylics Acron (AC), Pro Impact (PI), Procast DSP (PC) and IvoBase High Impact (HI) which are required in ISO 20795-1, Type 3 denture base materials. And for cantilever beam tests there was no significant difference between PI and either EstheShot (ES), EstheShot Bright (ESB), REN or Acry Tone (ACT) in load at 0.5mm deformation, and no significant difference between PI and either Lucitone FRS (LTF), ES, ESB, REN or ACT in elastic modulus. CONCLUSIONS The results thus suggested that some of the acrylic materials used as denture base materials may also be usable for NMCDs, and that the flexural properties of the acrylic material PI resemble those of ES, ESB and ACT, meaning that similar clasp designs may also be feasible.
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Affiliation(s)
- Yoshihiro Iwata
- Department of Oral Function and Rehabilitation, Nihon University School of Dentistry at Matsudo, Japan; Nihon University Graduate School of Dentistry at Matsudo, Japan.
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20
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Duymus ZY, Ozdogan A, Ulu H, Ozbayram O. Evaluation the Vickers Hardness of Denture Base Materials. ACTA ACUST UNITED AC 2016. [DOI: 10.4236/ojst.2016.64014] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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21
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Sasaki H, Hamanaka I, Takahashi Y, Kawaguchi T. Effect of Reinforcement on the Flexural Properties of Injection-Molded Thermoplastic Denture Base Resins. J Prosthodont 2015; 26:302-308. [DOI: 10.1111/jopr.12419] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/16/2015] [Indexed: 11/30/2022] Open
Affiliation(s)
- Hirono Sasaki
- Division of Removable Prosthodontics; Fukuoka Dental College; Fukuoka Japan
| | - Ippei Hamanaka
- Division of Removable Prosthodontics; Fukuoka Dental College; Fukuoka Japan
| | - Yutaka Takahashi
- Division of Removable Prosthodontics; Fukuoka Dental College; Fukuoka Japan
| | - Tomohiro Kawaguchi
- Division of Removable Prosthodontics; Fukuoka Dental College; Fukuoka Japan
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22
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Effects of thermal cycling on surface roughness, hardness and flexural strength of polymethylmethacrylate and polyamide denture base resins. J Appl Biomater Funct Mater 2015; 13:e280-6. [PMID: 26350350 DOI: 10.5301/jabfm.5000236] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/28/2015] [Indexed: 11/20/2022] Open
Abstract
BACKGROUND The purpose of this study was to evaluate the effects of thermal cycling on the surface roughness, hardness and flexural strength of denture resins. METHODS Polyamide (PA; Deflex and Valplast) and polymethylmethacrylate (PMMA; QC-20 and Acron MC) denture materials were selected. A total of 180 specimens were fabricated and then divided into 3 groups. The first group (group 1) acted as a control and was not thermocycled. The second group (group 2) was subjected to thermocycling for 10,000 cycles in artificial saliva and 5,000 cycles in distilled water. The last group (group 3) was thermocycled for 20,000 cycles in artificial saliva and 10,000 cycles in distilled water. The surface roughness were measured with a profilometer. The hardness of the resins were measured with a Vickers Hardness Tester using a 100-gf load. The flexural strength test was performed using the universal test machine with a crosshead speed of 5 mm/min. Data were analyzed using statistical software. The results of the measurements in the 3 different tests were analyzed by Kruskal-Wallis test with Bonferroni correction. Multiple comparisons were made by Conover and Wilcoxon tests. RESULTS AND CONCLUSIONS There was a significant difference between the PMMA and PA groups in terms of surface roughness, hardness and transverse strength before and after thermal cycling (p<0.001). Thermal cycling did not change the surface roughness, hardness and flexural strength values of either the PMMA or PA group (p>0.001).
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23
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Jang DE, Lee JY, Jang HS, Lee JJ, Son MK. Color stability, water sorption and cytotoxicity of thermoplastic acrylic resin for non metal clasp denture. J Adv Prosthodont 2015; 7:278-87. [PMID: 26330974 PMCID: PMC4551783 DOI: 10.4047/jap.2015.7.4.278] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2014] [Revised: 02/23/2015] [Accepted: 03/20/2015] [Indexed: 12/03/2022] Open
Abstract
PURPOSE The aim of this study was to compare the color stability, water sorption and cytotoxicity of thermoplastic acrylic resin for the non-metal clasp dentures to those of thermoplastic polyamide and conventional heat-polymerized denture base resins. MATERIALS AND METHODS Three types of denture base resin, which are conventional heat-polymerized acrylic resin (Paladent 20), thermoplastic polyamide resin (Bio Tone), thermoplastic acrylic resin (Acrytone) were used as materials for this study. One hundred five specimens were fabricated. For the color stability test, specimens were immersed in the coffee and green tee for 1 and 8 weeks. Color change was measured by spectrometer. Water sorption was tested after 1 and 8 weeks immersion in the water. For the test of cytotoxicity, cell viability assay was measured and cell attachment was analyzed by FE-SEM. RESULTS All types of denture base resin showed color changes after 1 and 8 weeks immersion. However, there was no significant difference between denture base resins. All specimens showed significant color changes in the coffee than green tee. In water sorption test, thermoplastic acrylic resin showed lower values than conventional heat-polymerized acrylic resin and thermoplastic polyamide resin. Three types of denture base showed low cytotoxicity in cell viability assay. Thermoplastic acrylic resin showed the similar cell attachment but more stable attachment than conventional heat-polymerized acrylic resin. CONCLUSION Thermoplastic acrylic resin for the non-metal clasp denture showed acceptable color stability, water sorption and cytotoxicity. To verify the long stability in the mouth, additional in vitro studies are needed.
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Affiliation(s)
- Dae-Eun Jang
- Department of Prosthodontics, School of Dentistry, Chosun University, Gwangju, Republic of Korea
| | - Ji-Young Lee
- Department of Prosthodontics, School of Dentistry, Chosun University, Gwangju, Republic of Korea
| | - Hyun-Seon Jang
- Department of Oral Pathology, School of Dentistry, Chosun University, Gwangju, Republic of Korea
| | - Jang-Jae Lee
- Department of Computer Science and Statistics, College of Natural Sciences, Chosun University, Gwangju, Republic of Korea
| | - Mee-Kyoung Son
- Department of Prosthodontics, School of Dentistry, Chosun University, Gwangju, Republic of Korea
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24
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Polychronakis NC, Polyzois GL, Lagouvardos PE, Papadopoulos TD. Effects of cleansing methods on 3-D surface roughness, gloss and color of a polyamide denture base material. Acta Odontol Scand 2015; 73:353-63. [PMID: 25367196 DOI: 10.3109/00016357.2014.967720] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
OBJECTIVE The purpose of this study was to determine the effects of two denture cleansing methods on 3-D surface roughness, gloss and color of denture base materials. MATERIALS AND METHODS Thirty disks from nylon (Valplast) and 30 from heat-polymerized acrylic denture base material (Paladon 65) were made and 10 of each material were immersed in water (control), Val-Clean (peroxide cleanser) and Corega Extradent (peroxide cleanser) plus microwaving for a period simulating 30 days of daily cleansing. 3-D surface roughness, gloss and color parameters were measured before and after cleansing using an interferometric profilometer, a gloss meter and a colorimeter. The results were statistically analysed by regression, paired-t, Mann-Whitney and Kruskal-Wallis tests at α = 0.05 level of significance. RESULTS The results showed significant differences at baseline in L* and b* parameters between materials (p < 0.01), with a significantly lower gloss (p < 0.05) and higher roughness (p < 0.05) for Valplast. After cleansing, Δϵ* was significantly greater in Valplast than Paladon 65 (p < 0.05). Gloss of both materials decreased significantly within the Corega Extradent plus microwave solution (p < 0.05), while roughness increased significantly only for Paladon 65 (p < 0.05). CONCLUSIONS Valplast was found to have a significantly lower gloss and a higher roughness than Paladon 65 before cleansing. After cleansing, ΔE* increased more in Valplast than in Paladon 65, gloss of both materials decreased and roughness only of Paladon 65 increased within the Corega extradent plus microwaving method.
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Hamanaka I, Iwamoto M, Lassila LV, Vallittu PK, Shimizu H, Takahashi Y. The effect of cycling deflection on the injection-molded thermoplastic denture base resins. Acta Odontol Scand 2015; 74:67-72. [PMID: 25953322 DOI: 10.3109/00016357.2015.1042039] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
OBJECTIVE The aim of this study was to evaluate the effect of cycling deflection on the flexural behavior of injection-molded thermoplastic resins. MATERIALS AND METHODS Six injection-molded thermoplastic resins (two polyamides, two polyesters, one polycarbonate, one polymethyl methacrylate) and, as a control, a conventional heat-polymerized denture based polymer of polymethyl methacrylate (PMMA) were used in this study. The cyclic constant magnitude (1.0 mm) of 5000 cycles was applied using a universal testing machine to demonstrate plasticization of the polymer. Loading was carried out in water at 23ºC with eight specimens per group (n = 8). Cycling load (N) and deformation (mm) were measured. RESULTS Force required to deflect the specimens during the first loading cycle and final loading cycle was statistically significantly different (p < 0.05) with one polyamide based polymer (Valplast) and PMMA based polymers (Acrytone and Acron). The other polyamide based polymer (LucitoneFRS), polyester based polymers (EstheShot and EstheShotBright) and polycarbonate based polymer (ReigningN) did not show significant differences (p > 0.05). None of the materials fractured during the loading test. One polyamide based polymer (Valplast) displayed the highest deformation and PMMA based polymers (Acrytone and Acron) exhibited the second highest deformation among the denture base materials. CONCLUSION It can be concluded that there were considerable differences in the flexural behavior of denture base polymers. This may contribute to the fatigue resistance of the materials.
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Affiliation(s)
- Ippei Hamanaka
- a 1 Division of Removable Prosthodontics, Fukuoka Dental College , Fukuoka, Japan
- b 2 Department of Biomaterials Science and Turku Clinical Biomaterials Centre-TCBC, Institute of Dentistry, University of Turku , Turku, Finland
| | - Misa Iwamoto
- a 1 Division of Removable Prosthodontics, Fukuoka Dental College , Fukuoka, Japan
- b 2 Department of Biomaterials Science and Turku Clinical Biomaterials Centre-TCBC, Institute of Dentistry, University of Turku , Turku, Finland
| | - Lippo Vj Lassila
- b 2 Department of Biomaterials Science and Turku Clinical Biomaterials Centre-TCBC, Institute of Dentistry, University of Turku , Turku, Finland
| | - Pekka K Vallittu
- b 2 Department of Biomaterials Science and Turku Clinical Biomaterials Centre-TCBC, Institute of Dentistry, University of Turku , Turku, Finland
- c 3 City of Turku, Division for Welfare , Turku, Finland
| | - Hiroshi Shimizu
- d 4 Division of Biomaterials, Kyushu Dental University , Fukuoka, Japan
| | - Yutaka Takahashi
- a 1 Division of Removable Prosthodontics, Fukuoka Dental College , Fukuoka, Japan
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26
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GUNDOGDU M, YANIKOGLU N, BAYINDIR F, CIFTCI H. Effect of repair resin type and surface treatment on the repair strength of polyamide denture base resin. Dent Mater J 2015; 34:485-9. [DOI: 10.4012/dmj.2014-362] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Affiliation(s)
- Mustafa GUNDOGDU
- Department of Prosthodontics, Faculty of Dentistry, Atatürk University
| | - Nuran YANIKOGLU
- Department of Prosthodontics, Faculty of Dentistry, Atatürk University
| | - Funda BAYINDIR
- Department of Prosthodontics, Faculty of Dentistry, Atatürk University
| | - Hilal CIFTCI
- Department of Prosthodontics, Faculty of Dentistry, Atatürk University
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27
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Hamanaka I, Iwamoto M, Lassila L, Vallittu P, Shimizu H, Takahashi Y. Influence of water sorption on mechanical properties of injection-molded thermoplastic denture base resins. Acta Odontol Scand 2014; 72:859-65. [PMID: 24850507 DOI: 10.3109/00016357.2014.919662] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
OBJECTIVE This study investigated the influence of water sorption on certain mechanical properties of injection-molded thermoplastic denture base resins. MATERIALS AND METHODS Six thermoplastic resins (two polyamides, two polyesters, one polycarbonate, one polymethylmethacrylate) and a polymethylmethacrylate (PMMA) conventional heat-polymerized denture-based polymer, selected as a control, were tested. Specimens of each denture base material were fabricated according to ISO 1567 specifications and were either dry or water-immersed for 30 days (n = 10). The ultimate flexural strength, the flexural strength at the proportional limit and the elastic modulus of the denture base materials were calculated. RESULTS Water sorption significantly decreased the ultimate flexural strength, the flexural strength at the proportional limit and the elastic modulus of one of the polyamides and the PMMAs. It also significantly increased the ultimate flexural strength of the polycarbonate. CONCLUSION The mechanical properties of some injection-molded thermoplastic denture base resins changed after water sorption.
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Affiliation(s)
- Ippei Hamanaka
- Division of Removable Prosthodontics, Fukuoka Dental College , Fukuoka , Japan
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Asakawa Y, Takahashi H, Iwasaki N, Kobayashi M. Effect of ultraviolet light irradiation and sandblasting treatment on bond strengths between polyamide and chemical-cured resin. Dent Mater J 2014; 33:557-64. [PMID: 25087663 DOI: 10.4012/dmj.2014-016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The aim of this study was to evaluate the effects of ultraviolet light (UV) irradiation and sandblasting treatment on the shear bond strength between polyamide and chemical-cured resin. Three types of commercial polyamides were treated using UV irradiation, sandblasting treatment, and a combining sandblasting and UV irradiation. The shear bond strength was measured and analyzed using the Kruskal-Wallis test (α=0.05). Comparing shear bond strengths without surface treatment, from 4.1 to 5.7 MPa, the UV irradiation significantly increased the shear bond strengths except for Valplast, whose shear bond strengths ranged from 5.2 to 9.3 MPa. The sandblasting treatment also significantly increased the shear bond strengths (8.0 to 11.4 MPa). The combining sandblasting and UV irradiation significantly increased the shear bond strengths (15.2 to 18.3 MPa) comparing without surface treatment. This combined treatment was considered the most effective at improving the shear bond strength between polyamide and chemical-cured resin.
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Affiliation(s)
- Yuya Asakawa
- Advanced Biomaterials, Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University
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Osada H, Shimpo H, Hayakawa T, Ohkubo C. Influence of thickness and undercut of thermoplastic resin clasps on retentive force. Dent Mater J 2014; 32:381-9. [PMID: 23718997 DOI: 10.4012/dmj.2012-284] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Thermoplastic resin clasps have been used for esthetic denture rehabilitation. However, details of the design of the clasps have never been thoroughly clarified. This study investigated the retentive forces of thermoplastic resin clasps for non-metal clasp dentures. The retentive forces of all thermoplastic resin clasps depended on the elastic modulus of each resin, undercuts, thickness, and widths of the tested. A clasp with more than 0.5 mm undercut and 1.0 mm thickness is needed for Valplast. Similarly, more than 0.25 mm undercut and 1.0 mm thickness and 0.5 mm undercut and 0.5 mm thickness are required for Estheshot and Reigning, respectively; thus, the recommended clasp arm thickness is 1.0 mm to 1.5 mm for Valplast and Estheshot and 0.5 mm to 1.0 mm for Reigning when the width of the retentive arm is 5.0 mm.
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Affiliation(s)
- Hidekazu Osada
- Department of Removable Prosthodontics, Tsurumi University School of Dental Medicine, 2-1-3 Tsurumi, Tsurumi-ku, Yokohama, Kanagawa 230- 8501, Japan.
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Fueki K, Ohkubo C, Yatabe M, Arakawa I, Arita M, Ino S, Kanamori T, Kawai Y, Kawara M, Komiyama O, Suzuki T, Nagata K, Hosoki M, Masumi SI, Yamauchi M, Aita H, Ono T, Kondo H, Tamaki K, Matsuka Y, Tsukasaki H, Fujisawa M, Baba K, Koyano K, Yatani H. Clinical application of removable partial dentures using thermoplastic resin. Part II: Material properties and clinical features of non-metal clasp dentures. J Prosthodont Res 2014; 58:71-84. [PMID: 24746524 DOI: 10.1016/j.jpor.2014.03.002] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2013] [Accepted: 03/18/2014] [Indexed: 11/28/2022]
Abstract
This position paper reviews physical and mechanical properties of thermoplastic resin used for non-metal clasp dentures, and describes feature of each thermoplastic resin in clinical application of non-metal clasp dentures and complications based on clinical experience of expert panels. Since products of thermoplastic resin have great variability in physical and mechanical properties, clinicians should utilize them with careful consideration of the specific properties of each product. In general, thermoplastic resin has lower color-stability and higher risk for fracture than polymethyl methacrylate. Additionally, the surface of thermoplastic resin becomes roughened more easily than polymethyl methacrylate. Studies related to material properties of thermoplastic resin, treatment efficacy and follow-up are insufficient to provide definitive conclusions at this time. Therefore, this position paper should be revised based on future studies and a clinical guideline should be provided.
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Affiliation(s)
- Kenji Fueki
- Japan Prosthodontic Society, Clinical Guideline Committee (2011-2012), Japan; Section of Removable Partial Prosthodontics, Tokyo Medical and Dental University, Japan.
| | - Chikahiro Ohkubo
- Japan Prosthodontic Society, Non-Metal Clasp Denture Expert Panel (2011-2012), Japan; Japan Prosthodontic Society, Removable Prosthodontics Expert Panel (2011-2012), Japan; Department of Removable Prosthodontics, Tsurumi University School of Dental Medicine, Japan
| | - Masaru Yatabe
- Japan Prosthodontic Society, Non-Metal Clasp Denture Expert Panel (2011-2012), Japan; Section of Removable Partial Prosthodontics, Tokyo Medical and Dental University, Japan; Tokyo Branch, Japan
| | - Ichiro Arakawa
- Japan Prosthodontic Society, Non-Metal Clasp Denture Expert Panel (2011-2012), Japan; Japan Prosthodontic Society, Removable Prosthodontics Expert Panel (2011-2012), Japan; Department of Partial and Complete Denture, School of Life Dentistry at Tokyo, The Nippon Dental University, Japan
| | - Masahiro Arita
- Japan Prosthodontic Society, Non-Metal Clasp Denture Expert Panel (2011-2012), Japan; Japan Prosthodontic Society, Removable Prosthodontics Expert Panel (2011-2012), Japan; Division of Occlusion & Maxillofacial Reconstruction, Department of Oral Function, School of Dentistry, Kyushu Dental University, Japan
| | - Satoshi Ino
- Japan Prosthodontic Society, Non-Metal Clasp Denture Expert Panel (2011-2012), Japan; Kanagawa Dental University Yokohama Clinic, Japan
| | - Toshikazu Kanamori
- Japan Prosthodontic Society, Non-Metal Clasp Denture Expert Panel (2011-2012), Japan; Tohoku & Hokkaido Branch, Japan
| | - Yasuhiko Kawai
- Japan Prosthodontic Society, Non-Metal Clasp Denture Expert Panel (2011-2012), Japan; Japan Prosthodontic Society, Removable Prosthodontics Expert Panel (2011-2012), Japan; Department of Removable Prosthodontics, Nihon University School of Dentistry at Matsudo, Japan
| | - Misao Kawara
- Japan Prosthodontic Society, Non-Metal Clasp Denture Expert Panel (2011-2012), Japan; Department of Oral Function and Rehabilitation, Nihon University School of Dentistry at Matsudo, Japan
| | - Osamu Komiyama
- Japan Prosthodontic Society, Non-Metal Clasp Denture Expert Panel (2011-2012), Japan; Department of Oral Function and Rehabilitation, Nihon University School of Dentistry at Matsudo, Japan
| | - Tetsuya Suzuki
- Japan Prosthodontic Society, Non-Metal Clasp Denture Expert Panel (2011-2012), Japan; Japan Prosthodontic Society, Removable Prosthodontics Expert Panel (2011-2012), Japan; Section of Oral Prosthetic Engineering, Tokyo Medical and Dental University, Japan
| | - Kazuhiro Nagata
- Japan Prosthodontic Society, Non-Metal Clasp Denture Expert Panel (2011-2012), Japan; Comprehensive Dental Care, The Nippon Dental University Niigata Hospital, Japan
| | - Maki Hosoki
- Japan Prosthodontic Society, Non-Metal Clasp Denture Expert Panel (2011-2012), Japan; Department of Fixed Prosthodontics, Institute of Health Biosciences, The University of Tokushima Graduate School, Japan
| | - Shin-ichi Masumi
- Japan Prosthodontic Society, Non-Metal Clasp Denture Expert Panel (2011-2012), Japan; Division of Occlusion & Maxillofacial Reconstruction, Department of Oral Function, School of Dentistry, Kyushu Dental University, Japan
| | - Mutsuo Yamauchi
- Japan Prosthodontic Society, Non-Metal Clasp Denture Expert Panel (2011-2012), Japan; Department of Prosthodontics, Division of Oral Functional Science and Rehabilitation, School of Dentistry, Asahi University, Japan
| | - Hideki Aita
- Japan Prosthodontic Society, Clinical Guideline Committee (2011-2012), Japan; Division of Occlusion and Removable Prosthodontics, Health Sciences University of Hokkaido, Japan
| | - Takahiro Ono
- Japan Prosthodontic Society, Clinical Guideline Committee (2011-2012), Japan; Department of Prosthodontics, Gerodontology and Oral Rehabilitation, Osaka University Graduate School of Dentistry, Japan
| | - Hisatomo Kondo
- Japan Prosthodontic Society, Clinical Guideline Committee (2011-2012), Japan; Department of Prosthodontics and Oral Implantology, Iwate Medical University, Japan
| | - Katsushi Tamaki
- Japan Prosthodontic Society, Clinical Guideline Committee (2011-2012), Japan; Department of Oral & Maxillofacial Rehabilitation, Removable Prosthetics, Kanagawa Dental College, Japan
| | - Yoshizo Matsuka
- Japan Prosthodontic Society, Clinical Guideline Committee (2011-2012), Japan; Department of Fixed Prosthodontics, Institute of Health Biosciences, The University of Tokushima Graduate School, Japan
| | - Hiroaki Tsukasaki
- Japan Prosthodontic Society, Clinical Guideline Committee (2011-2012), Japan; Department of Prosthodontics, Showa University, Japan
| | - Masanori Fujisawa
- Japan Prosthodontic Society, Clinical Guideline Committee (2011-2012), Japan; Division of Fixed Prosthodontics, School of Dentistry, Meikai University, Japan
| | - Kazuyoshi Baba
- Japan Prosthodontic Society, Clinical Guideline Committee (2011-2012), Japan; Department of Prosthodontics, Showa University, Japan
| | - Kiyoshi Koyano
- Japan Prosthodontic Society, Clinical Guideline Committee (2011-2012), Japan; Section of Implant and Rehabilitative Dentistry, Division of Oral Rehabilitation Faculty of Dental Science, Kyushu University, Japan
| | - Hirofumi Yatani
- Department of Fixed Prosthodontics, Osaka University Graduate School of Dentistry, Japan
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Hamanaka I, Takahashi Y, Shimizu H. Properties of injection-molded thermoplastic polyester denture base resins. Acta Odontol Scand 2014; 72:139-44. [PMID: 24255964 DOI: 10.3109/00016357.2013.814803] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
OBJECTIVE This study investigated the properties of injection-molded thermoplastic polyester denture base resins. MATERIALS AND METHODS Two injection-molded thermoplastic polyester denture base resins (polyethylene terephthalate copolymer and polycycloalkylene terephthalate copolymer) were tested. Specimens of each denture base material were fabricated for flexural properties testing, Charpy impact testing and shear bond testing (n = 10). The flexural strength at the proportional limit, elastic modulus, Charpy impact strength and the shear bond strength of the two denture base materials were estimated. RESULTS The polycycloalkylene terephthalate copolymer denture base resin had significantly lower flexural strength at the proportional limit, lower elastic modulus, higher impact strength and lower shear bond strength compared to the polyethylene terephthalate copolymer denture base resin. CONCLUSION The properties of the injection-molded thermoplastic denture base resins composed of polyethylene terephthalate copolymer and polycycloalkylene terephthalate copolymer were different from each other. The polycycloalkylene terephthalate copolymer denture base resin had significantly lower flexural strength at the proportional limit, lower elastic modulus, higher impact strength and lower shear bond strength compared to the polyethylene terephthalate copolymer denture base resin.
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Affiliation(s)
- Ippei Hamanaka
- Division of Removable Prosthodontics, Fukuoka Dental College , Fukuoka , Japan
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KIM JH, CHOE HC, SON MK. Evaluation of adhesion of reline resins to the thermoplastic denture base resin for non-metal clasp denture. Dent Mater J 2014; 33:32-8. [DOI: 10.4012/dmj.2013-121] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Hamanaka I, Shimizu H, Takahashi Y. Shear bond strength of an autopolymerizing repair resin to injection-molded thermoplastic denture base resins. Acta Odontol Scand 2013; 71:1250-4. [PMID: 23339746 DOI: 10.3109/00016357.2012.757645] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
OBJECTIVE This study investigated the shear bond strength of an autopolymerizing repair resin to injection-molded thermoplastic denture base resins. MATERIALS AND METHODS Four injection-molded thermoplastic resins (two polyamides, a polyethylene terephthalate copolymer and a polycarbonate) were used in this study. The specimens were divided into eight groups according to the type of surface treatment given: (1) no treatment, (2) air abrasion with alumina, (3) dichloromethane, (4) ethyl acetate, (5) 4-META/MMA-TBB resin, (6) alumina and 4-META/MMA-TBB resin, (7) tribochemical silica coating or (8) tribochemical silica coating and 4-META/MMA-TBB resin. Half of the specimens in groups 1, 5, 6 and 8 were thermocycled for 10,000 cycles in water between 5-55°C with a dwell time of 1 min at each temperature. The shear bond strengths were determined. RESULTS The shear bond strengths to the two polyamides treated with alumina, dichloromethane and ethyl acetate and no treatment were very low. The greatest post-thermocycling bond strengths to polyamides were recorded for the specimens treated with tribochemical silica coating and 4-META/MMA-TBB resin (PA12: 16.4 MPa, PACM12: 17.5 MPa). The greatest post-thermocycling bond strengths to polyethylene terephthalate copolymer and polycarbonate were recorded for the treatment with alumina and 4-META/MMA-TBB resin (22.7 MPa, 20.8 MPa). CONCLUSION Polyamide was exceedingly difficult to bond to an autopolymerizing repair resin; the shear bond strength improved using tribochemical silica coating followed by the application of 4-META/MMA-TBB resin. Both polyethylene terephthalate copolymer and polycarbonate were originally easy to bond to an autopolymerizing repair resin. However, with 4-META/MMA-TBB resin, the bond was more secure.
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Affiliation(s)
- Ippei Hamanaka
- Division of Removable Prosthodontics, Fukuoka Dental College, Fukuoka, Japan.
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Atsu S, KeskIn Y. Effect of silica coating and silane surface treatment on the bond strength of soft denture liner to denture base material. J Appl Oral Sci 2013; 21:300-6. [DOI: 10.1590/1678-775720130066] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2013] [Accepted: 05/15/2013] [Indexed: 11/22/2022] Open
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Dittmer MP, Nensa M, Stiesch M, Kohorst P. Load-bearing capacity of screw-retained CAD/CAM-produced titanium implant frameworks (I-Bridge®2) before and after cyclic mechanical loading. J Appl Oral Sci 2013; 21:307-13. [DOI: 10.1590/1678-775720130077] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2013] [Accepted: 05/10/2013] [Indexed: 11/22/2022] Open
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Alla RK, Sajjan S, Alluri VR, Ginjupalli K, Upadhya N. Influence of Fiber Reinforcement on the Properties of Denture Base Resins. ACTA ACUST UNITED AC 2013. [DOI: 10.4236/jbnb.2013.41012] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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The combination of a nylon and traditional partial removable dental prosthesis for improved esthetics: A clinical report. J Prosthet Dent 2013; 109:5-8. [DOI: 10.1016/s0022-3913(13)60002-5] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Kürkçüoğlu I, Köroğlu A, Özkır SE, Özdemir T. A Comparative Study of Polyamide and PMMA Denture Base Biomaterials: I. Thermal, Mechanical, and Dynamic Mechanical Properties. INT J POLYM MATER PO 2012. [DOI: 10.1080/00914037.2011.610047] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Takahashi Y, Hamanaka I, Shimizu H. Effect of thermal shock on mechanical properties of injection-molded thermoplastic denture base resins. Acta Odontol Scand 2012; 70:297-302. [PMID: 21793643 DOI: 10.3109/00016357.2011.600719] [Citation(s) in RCA: 34] [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 This study investigated the effect of thermal shock on the mechanical properties of injection-molded thermoplastic denture base resins. MATERIALS AND METHODS Four thermoplastic resins (two polyamides, one polyethylene terephthalate, one polycarbonate) and, as a control, a conventional heat-polymerized polymethyl methacrylate (PMMA), were tested. Specimens of each denture base material were fabricated according to ISO 1567 and were either thermocycled or not thermocycled (n = 10). The flexural strength at the proportional limit (FS-PL), the elastic modulus and the Charpy impact strength of the denture base materials were estimated. RESULTS Thermocycling significantly decreased the FS-PL of one of the polyamides and the PMMA and it significantly increased the FS-PL of one of the polyamides. In addition, thermocycling significantly decreased the elastic modulus of one of the polyamides and significantly increased the elastic moduli of one of the polyamides, the polyethylene terephthalate, polycarbonate and PMMA. Thermocycling significantly decreased the impact strength of one of the polyamides and the polycarbonate. CONCLUSIONS The mechanical properties of injection-molded thermoplastic denture base resins changed after themocycling.
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Affiliation(s)
- Yutaka Takahashi
- Division of Removable Prosthodontics, Fukuoka Dental College, Fukuoka, Japan.
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Tensile bond strength of silicone-based soft denture liner to two chemically different denture base resins after various surface treatments. Lasers Med Sci 2012; 28:119-23. [DOI: 10.1007/s10103-012-1082-7] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2011] [Accepted: 03/13/2012] [Indexed: 11/26/2022]
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YAMAGUCHI H, INO S, HAMANO N, OKADA S, TERANAKA T. Examination of bond strength and mechanical properties of Y-TZP zirconia ceramics with different surface modifications. Dent Mater J 2012; 31:472-80. [DOI: 10.4012/dmj.2011-237] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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42
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Hamanaka I, Takahashi Y, Shimizu H. Mechanical properties of injection-molded thermoplastic denture base resins. Acta Odontol Scand 2011; 69:75-9. [PMID: 20873995 DOI: 10.3109/00016357.2010.517557] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
OBJECTIVE To investigate the mechanical properties of injection-molded thermoplastic denture base resins. MATERIAL AND METHODS Four injection-molded thermoplastic resins (two polyamides, one polyethylene terephthalate, one polycarbonate) and, as a control, a conventional heat-polymerized polymethyl methacrylate (PMMA), were used in this study. The flexural strength at the proportional limit (FS-PL), the elastic modulus, and the Charpy impact strength of the denture base resins were measured according to International Organization for Standardization (ISO) 1567 and ISO 1567:1999/Amd 1:2003. RESULTS The descending order of the FS-PL was: conventional PMMA > polyethylene terephthalate, polycarbonate > two polyamides. The descending order of the elastic moduli was: conventional PMMA > polycarbonate > polyethylene terephthalate > two polyamides. The descending order of the Charpy impact strength was: polyamide (Nylon PACM12) > polycarbonate > polyamide (Nylon 12), polyethylene terephthalate > conventional PMMA. CONCLUSIONS All of the injection-molded thermoplastic resins had significantly lower FS-PL, lower elastic moduli, and higher or similar impact strength compared to the conventional PMMA. The polyamide denture base resins had low FS-PL and low elastic moduli; one of them possessed very high impact strength, and the other had low impact strength. The polyethylene terephthalate denture base resin showed a moderately high FS-PL, moderate elastic modulus, and low impact strength. The polycarbonate denture base resin had a moderately high FS-PL, moderately high elastic modulus, and moderate impact strength.
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Affiliation(s)
- Ippei Hamanaka
- Division of Removable Prosthodontics, Fukuoka Dental College, Fukuoka, Japan
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KANIE T, KADOKAWA A, ARIKAWA H, FUJII K, BAN S. Flexural properties of ethyl or methyl methacrylate-UDMA blend polymers. Dent Mater J 2010; 29:575-81. [DOI: 10.4012/dmj.2010-045] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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