Dental Materials Journal

Featured article

Volume 35 (2016) Issue 2 Pages 250-256

Dimensional accuracy of dental casting patterns created by 3D printers

Yoshiki ISHIDA, Taira MIYASAKA

Contrary to widespread incise CAD/CAM, little is known about the dental application of 3D printing, especially the possibility of using 3D printing with organic material. The resin patterns of a full crown model were created by four types of 3D printers, a thermofusion device (CX), a digital light processing stereo-lithograph device (B9), a laser stereo-lithograph device (DW) and a multi-jet modeling device (PJ). The dimensional accuracy of the outer and inner diameters and depths of the created model crowns, and the surface roughness of sidewall were investigated. The outer diameters were smaller than the designed value in most conditions. The inner diameters were smaller than the designed value in any enlargement ratio except B9. The depth of CX or B9 tended to become shallower, though that of PJ or DW tended to increase. The surface roughness along the tooth axis direction was greater than that perpendicular to the tooth axis.

Editor's pick

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 2.59.

Volume 33 (2014) Issue 1 Pages 64-69

Genotoxicity and cytotoxicity of mineral trioxide aggregate and calcium enriched mixture cements on L929 mouse fibroblast cells

Neda NAGHAVI, Jamileh GHODDUSI, Hamid R. SADEGHNIA, Elham ASADPOUR, Saeed ASGARY

Mineral trioxide aggregate (MTA) has shown good biocompatibility in several studies. In the present study, the genotoxic and cytotoxic effects of calcium enriched mixture (CEM) were evaluated compared with MTA using MTT and single-cell gel (comet) assays with serial ascending concentrations (0 to 1,000 µg/mL) of tested materials. Cytotoxicity data indicated that there is no significant difference between CEM and MTA at all concentrations except for the full concentration (1,000 µg/mL); CEM had lower cytotoxicity. Genotoxic effects were more evident with CEM at concentrations of 15.6 and 250 µg/mL; however, was less than that of MTA at concentrations of 500 and 1,000 µg/mL. The cytotoxicity and genotoxicity effects of the two experimental groups generally increased with consistency. Under the conditions of this study, CEM is biocompatible in terms of cyto- and genotoxicity. It appears to be an alternative to MTA as an endodontic biomaterial offering several advantages.

Editor's pick

FWCI score of this article is 2.57.

Volume 35 (2016) Issue 1 Pages 29-36

Bonding effectiveness of self-adhesive and conventional-type adhesive resin cements to CAD/CAM resin blocks. Part 2: Effect of ultrasonic and acid cleaning

Asuka KAWAGUCHI, Mariko MATSUMOTO, Mami HIGASHI, Jiro MIURA, Takuya MINAMINO, Tomoshige KABETANI, Fumio TAKESHIGE, Atsushi MINE, Hirofumi YATANI

The present study assessed the effect of ultrasonic and acid cleaning on resin cement bonding to CAD/CAM resin blocks. One of two resin cements, PANAVIA V5 (PV5) or PANAVIA SA CEMENT HANDMIX (PSA), were bonded to one of 24 CAD/CAM blocks (KATANA AVENCIA BLOCK). Each cement group was divided into four subgroups: no cleaning (Ctl), ultrasonic cleaning (Uc), acid cleaning (Ac) and Uc+Ac. Micro-tensile bond strengths (µTBSs) were measured immediately and 1, 3, and 6 months after water storage. Block surfaces after each treatment were analyzed by scanning electron microscopy. Analysis of variance revealed a statistically significant effect for the parameters ‘surface treatment’ (p<0.001, F=40), ‘resin cement’ (p<0.001, F=696) and ‘water aging’ (p<0.001, F=71). The PV5 group exhibited higher µTBS values than the PSA group. Although cleaning after sandblasting was effective in removing residual alumina particles, it did not affect the long-term bonding durability with non-contaminated CAD/CAM resin blocks.

Editor's pick

FWCI score of this article is 2.42.

Volume 33 (2014) Issue 1 Pages 79-85

Dental zirconia can be etched by hydrofluoric acid

Tool SRIAMPORN, Niyom THAMRONGANANSKUL, Chumphol BUSABOK, Sushit POOLTHONG, Motohiro UO, Junji TAGAMI

The surface morphology and crystal structure change of dental zirconia after hydrofluoric acid (HF) etching were evaluated. Four groups of sintered zirconia specimens were 1) control group, 2) immersion in 9.5%HF at 25^oC for 1, 2, 3, or 24 h, 3) immersion in 9.5%HF at 80^oC for 1, 3, 5, or 30 min and 4) immersion in 48%HF at 25^oC for 30 or 60 min. The specimens were evaluated under SEM and XRD. The SEM analysis revealed changes in surface topography for all the HF-etched zirconia specimens. The irregularities surface increased with increasingly longer immersion times and higher etching solution temperatures. The XRD analysis of the HFetched zirconia specimens revealed the presence of a crystalline monoclinic phase along with a tetragonal form. It was concluded HF can etch dental zirconia ceramic, creating micro-morphological changes. Tetragonal-to-monoclinic phase transformation was induced on the etched zirconia surface.

Editor's pick

FWCI score of this article is 2.43.

Volume 34 (2015) Issue 6 Pages 910-917

Translucency and flexural strength of monolithic translucent zirconia and porcelain-layered zirconia

Fumiyori MATSUZAKI, Hideshi SEKINE, Shinya HONMA, Takuya TAKANASHI, Katsunori FURUYA, Yasutomo YAJIMA, Masao YOSHINARI

This study aims to investigate the effectiveness of monolithic translucent TZP with different colors and porcelain-layered TZP by evaluating their colors and strengths. Different mixing ratios of Zpex to Zpex-Yellow as translucent TZP, conventional opaque TZP (TZ-3YB-E) (Tosoh, Tokyo) as a control, and veneering porcelain (CERABIEN ZR, body porcelain, Noritake, Tokyo) with shade A3 as a typical shade. Disk-shaped specimens of 13 mm diameter and 1.5 mm thickness were prepared. These specimens were observed under reflected and transmitted light, and the translucency parameter (TP) values were measured. Strength was also evaluated with flexural strength in a biaxial bending test. The TP values of the monolithic TZP, Zpex100>Zpex70>Zpex50>TZ3YB, were larger in this order. The flexural strength of all the monolithic TZP showed approximately 1,000 MPa. It is suggested that colored translucent TZP is clinically useful when used as monolithic restorations.

Editor's pick

FWCI score of this article is 2.55.

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2023 Volume 42 Issue 3

Fracture resistance of simulated immature maxillary anterior teeth restored with various canal filling materials, with micro-posts or with a fiber post Alexandre CROZET, Davy AUBEUX, Fabienne PÉREZ, Alexis GAUDIN
Influence of the thickening agent contained in a phosphoric acid etchant on bonding between feldspar porcelain and resin cement with a silane coupling agent Yuya KOMAGATA, Hiroshi IKEDA, Haruka TAKASUE YANO, Yuki NAGAMATSU, Chihiro MASAKI, Ryuji HOSOKAWA, Hiroshi SHIMIZU
Effect of luting system with acidic primers on the durability of bonds with Ti-15Mo-5Zr-3Al titanium alloy and its component metals Takeshi WADA, Hiroyasu KOIZUMI, Haruto HIRABA, Takao HANAWA, Hideo MATSUMURA, Takayuki YONEYAMA
Comparison of the shear rebond strength of zirconia brackets treated with different Er:YAG laser energies Nan ZANG, Huihui TAO, Zhuoran LIANG, Hongyan LIU, Jiazhen HE, Bo WANG

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