Dental Materials Journal

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33 巻 (2014) 5 号 p. 705-710

Mechanical properties of composite resin blocks for CAD/CAM

Sasipin LAUVAHUTANON, Hidekazu TAKAHASHI, Maho SHIOZAWA, Naohiko IWASAKI, Yuya ASAKAWA, Meiko OKI, Werner J. FINGER, Mansuang ARKSORNNUKIT

This study compared commercial composite resin blocks with one ceramic block for use in computer-aided design/computer aided manufacturing (CAD/CAM). Four composite resins, one composite ceramic, and one feldspar-ceramic block were investigated. Flexural strength (FS), flexural modulus (FM), and Vickers hardness (VH) were determined under three conditions: dry storage; immersion in water at 37°C for 7 days; and immersion in water at 37°C for 7 days followed by 10,000 thermocycles. After dry storage, FS ranged from 127 to 242 MPa, FM from 9.6 to 51.5 GPa, and VH from 64 to 455. Two-way ANOVA was performed for FS, FM and VH followed by Tukey’s multiple comparison (α<0.05). Results demonstrated that the materials degraded after water immersion and thermocycling, but their properties were within the acceptable range for fabrication of single restorations according to the ISO standard for ceramics (ISO 6872:2008).

編集者のコメント

Field Weighted Citation Impact (FWCI) is one of indices to evaluate the scientific publishing by estimating the total citation ratio based on the average of the subject field from Scopus database. FWCI could therefore be used as the index over specific field. Here, we show the example of DMJ articles from 2014 to 2016 with relatively higher FWCI values beyond 1.0 which is considered the average of the subject field. The editors of the DMJ would like to introduce some of the articles here. FWCI score of this article is 4.29.

35 巻 (2016) 2 号 p. 216-224

Comparative study on the resorbability and dissolution behavior of octacalcium phosphate, β-tricalcium phosphate, and hydroxyapatite under physiological conditions

Susumu SAKAI, Takahisa ANADA, Kaori TSUCHIYA, Hajime YAMAZAKI, Henry C. MARGOLIS, Osamu SUZUKI

The dissolution behaviors of octacalcium phosphate (OCP), β-tricalcium phosphate (β-TCP), and hydroxyapatite (HA) were compared by implanting the materials in rat subcutaneous pouches for 8 weeks using a filter chamber or immersing them in simulated body fluid (SBF) or Tris-HCl buffer for 2 weeks at pH 7.4 and 37^oC. X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, and chemical analysis were conducted on these materials. Degree of supersaturation (DS) in the two solutions immersed with each calcium phosphate material was calculated from their chemical compositions. The results showed that OCP partially converted to apatitic crystals, while β-TCP and HA remained unchanged after the implantation. The DS of the SBF solution remained slightly supersaturated with respect to OCP and β-TCP, but slightly undersaturated in the Tris-HCl buffer. These findings suggest that previously reported OCP and β-TCP biodegradation could be induced through cell-mediated osteoclastic resorption rather than a simple dissolution process.

編集者のコメント

FWCI score of this article is 3.46.

35 巻 (2016) 4 号 p. 668-674

Effect of surface pretreatments on resin composite bonding to PEEK

Patcharawan SILTHAMPITAG, Pisaisit CHAIJAREENONT, Kittipong TATTAKORN, Chaiyasit BANJONGPRASERT, Hidekazu TAKAHASHI, Mansuang ARKSORNNUKIT

This study evaluated the effect of surface pretreatments on resin composite bonding to polyetheretherketone (PEEK). Four groups of surface pretreatment (no pretreatment, etched with 98% sulfuric acid, etched with piranha solution and sandblasting with 50 µm alumina) were performed on PEEK. Surface roughness, Scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR) analysis were examined. Shear bond strength (SBS) and interface characteristics were also evaluated after the specimens were bonded with resin materials. Two-way ANOVA analysis revealed significance on two main effects and interactions. Tukey’s multiple comparisons test showed that the SBS of resin composite on PEEK were the highest in the group etched with 98% sulfuric acid and bonded with Heliobond^® (p<0.05). All pretreatments produced similar spectra of FTIR patterns. SEM demonstrated porosities and pitting from chemical etching, which suggested a significant influence on the adhesion between PEEK and resin materials.

編集者のコメント

FWCI score of this article is 3.28.

35 巻 (2016) 3 号 p. 418-424

Mechanical properties, volumetric shrinkage and depth of cure of short fiber-reinforced resin composite

Akimasa TSUJIMOTO, Wayne W. BARKMEIER, Toshiki TAKAMIZAWA, Mark A. LATTA, Masashi MIYAZAKI

The mechanical properties, volumetric shrinkage and depth of cure of a short fiber-reinforced resin composite (SFRC) were investigated in this study and compared to both a bulk fill resin composite (BFRC) and conventional glass/ceramic-filled resin composite (CGRC). Fracture toughness, flexural properties, volumetric shrinkage and depth of cure of the SFRC, BFRC and CGRC were measured. SFRC had significantly higher fracture toughness than BFRCs and CGRCs. The flexural properties of SFRC were comparable with BFRCs and CGRCs. SFRC showed significantly lower volumetric shrinkage than the other tested resin composites. The depth of cure of the SFRC was similar to BFRCs and higher than CGRCs. The data from this laboratory investigation suggests that SFRC exhibits improvements in fracture toughness, volumetric shrinkage and depth of cure when compared with CGRC, but depth of cure of SFRC was similar to BFRC.

編集者のコメント

FWCI score of this article is 2.76.

34 巻 (2015) 1 号 p. 7-12

Three-unit reinforced polyetheretherketone composite FDPs: Influence of fabrication method on load-bearing capacity and failure types

Bogna STAWARCZYK, Marlis EICHBERGER, Julia UHRENBACHER, Timea WIMMER, Daniel EDELHOFF, Patrick R. SCHMIDLIN

To investigate the influence of different fabrication methods of three-unit reinforced polyetheretherketone composite (PEEK/C) fixed dental prostheses (FDPs) on fracture load. Forty-five three-unit anatomically supported PEEK/C FDPs were fabricated as follows: i. milled using a CAD/CAM system from an industrially fabricated PEEK/C blank, ii. pressed from industrially fabricated PEEK/C pellets, and iii. pressed from granular PEEK/C. Fracture load was measured and data were statistically analysed (p<0.05). CAD/CAM fabricated FDPs (2,354 N) presented a higher mean fracture load than those pressed from granular PEEK/C material (1,738 N) (p<0.001). CAD/CAM milled FDPs and those pressed from PEEK/C-pellets showed spontaneous and brittle fractures near the pontic without deformation of the FDP. In contrast, granulate pressed FDPs showed some plastic deformation without fracture. CAD/CAM fabricated FDPs, and FDPs pressed from PEEK/C pellets showed higher Weibull moduli compared to FDPs pressed in granular form. Industrial pre-pressing of blanks (CAD/CAM/pellet) increased the stability and reliability of PEEK restorations.

編集者のコメント

FWCI score of this article is 2.69.

すべてのおすすめ記事を見る

2020 年 39 巻 4 号

Effects of bioactive glass coating by electrophoretic deposition on esthetical, bending, and frictional performance of orthodontic stainless steel wire Kyotaro KAWAGUCHI, Masahiro IIJIMA, Takeshi MUGURUMA, Kazuhiko ENDO, Itaru MIZOGUCHI
Development of image analysis using Python: Relationship between matrix ratio of composite resin and curing temperature Miki HORI, Kotaro FUJIMOTO, Tadasuke HORI, Hironao SEKINE, Atsuko UENO, Akiko KATO, Tatsushi KAWAI
Monomer conversion, dimensional stability, biaxial flexural strength, and fluoride release of resin-based restorative material containing alkaline fillers Piyaphong PANPISUT, Arnit TONELUCK
Development of silicon nitride ceramic for CAD/CAM restoration Nantawan KRAJANGTA, Lertrit SARINNAPHAKORN, Pavinee Padipatvuthikul DIDRON, Thanakorn WASANAPIARNPONG

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Mechanical properties, volumetric shrinkage and depth of cure of short fiber-reinforced resin composite

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Current status of direct pulp-capping materials for permanent teeth

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The effect of powder to liquid ratio on physical properties and fluoride release of glass ionomer cements containing pre-reacted spherical glass fillers

公開日: 2020/08/02 | 39 巻 4 号 p. 563-570

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Bio-active restorative materials with antibacterial effects: new dimension of innovation in restorative dentistry

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