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Dental Materials Journal

Kazuo Ohkuma, Takashi Kameda, Kazuto Terada
Directly milling zirconia computer-aided design (CAD)/computer-aided manufacturing (CAM) crowns from fully sintered zirconia blocks using a five-axis laser milling system, compared with three-axis milling and full sintering by heating milled semi-sintered crowns, was investigated. The mechanical characteristics of zirconia specimens were similar across groups. The order of the marginal gap was three-axis>conventional (lingual thickness of 1.5 mm>0.5 mm)>five-axis group (close to zero). The marginal shape was almost perfectly circular in all groups...
September 14, 2018: Dental Materials Journal
Paul Lutgen, Daniel Chan, Alireza Sadr
This study evaluated bonding of adhesives to dentin treated with silver diammine fluoride (SDF). Micro-shear bond strength (MSBS) to sound human dentin was investigated for 3 adhesive systems: Clearfil SE bond 2 (CSE), and Scotchbond Universal in self-etching (SBU) and phosphoric acid-etching (SBT) modes, following 4 different SDF application protocols (n=10); Control: treated with deionized water. P1: SDF applied for 10-s, no rinse. P2: SDF applied for 10-s, rinsed off after 1-min. P3: superficial dentin polished off after 24-h following P1...
September 14, 2018: Dental Materials Journal
Guanjun Zhou, Xiaoli Zhang, Hui Qie, Chenxi Li, Lin Lu, Lihua Shan
To investigate the cause of mandibular implant loss, we evaluated the stress distribution in the bone under bite force when the miniimplant was near the root using three-dimensional finite element analysis. Our analysis involved four finite element models with different distances between the implant and adjacent tooth root and three loading conditions. With loading of the tooth only or both the tooth and implant, the peak stress within the bone around the implant neck, displacement, and stress surrounding the bone near the root increased as the distance between the implant and root decreased...
September 14, 2018: Dental Materials Journal
Tiantian Wu, Chen Xu, Rong DU, Yang Wen, Jiang Chang, Zhiguang Huan, Yaqin Zhu
The objective of this study was to investigate the effects of a silicate-based composite material on proliferation and mineralization of human dental pulp cells (hDPCs), which was compared with those of calcium hydroxide (Ca(OH)2 , CH) and tricalcium silicate (Ca3 SiO5 , C3S). HDPCs were cultured with CH, C3S and tricalcium silicate/dicalcium silicate (Ca3 SiO5 /Ca2 SiO4 , C3S/C2S) composites extract. The CCK-8 assay showed that the composite material stimulated the proliferation of hDPCs. The odontogenic marker genes and DSPP protein expression were more significantly up-regulated by the C3S/C2S composite material compared with pure CH and C3S...
September 14, 2018: Dental Materials Journal
Manhal Ijbara, Kanae Wada, Junichiro Wada, Jayanetti Asiri Jayawardena, Michiyo Miyashin
Surface replication is a nondestructive evaluation technique applied in examining surfaces' cracks/wear. This is quite valuable when the surface of interest cannot be further manipulated by cutting or polishing to fit directly under a microscope. Replication by acetate sheets is one of the techniques applied in industrial, metallographic and anthropological wear/examination. Enamel is the outermost protective layer of human teeth and is subjected to mechanical stresses due to the masticatory function; thus, wear is inevitable in human teeth...
September 14, 2018: Dental Materials Journal
Junichi Shinagawa, Go Inoue, Toru Nikaido, Masaomi Ikeda, Michael F Burrow, Junji Tagami
The purpose of this study was to evaluate the early tensile bond strengths of three different resin cements; Super Bond C&B (conventional and quick type) and ResiCem to a CAD/CAM composite block. A CAD/CAM composite block (Shofu Block HC) was ground and silanized according to the manufacturers' instructions before cementation. A conventional tensile bond strength test (Ø: 4 mm) was performed 10 min, 1 h and 24 h after bonding. Super Bond C&B (quick type) showed the highest bond strength at 24 h. However, results of a three-point bend test showed the mechanical properties were weaker for the Super Bond C&B cements compared with composite cement, Resicem...
August 29, 2018: Dental Materials Journal
Takashi Nakamura, Shinya Okamura, Hisataka Nishida, Hirofumi Usami, Yoshiro Nakano, Kazumichi Wakabayashi, Tohru Sekino, Hirofumi Yatani
The fluorescence and physical properties of thulium-doped zirconia were investigated. A standard grade of zirconia (TZ-3Y-E) and two translucent dental zirconia materials (Zpex and Zpex Smile) were examined. The specimens were prepared by addition of 0-1.5 wt% Tm2 O3 and then sintering. When exposed to UV light, the Tm2 O3 -doped zirconia exhibited blue fluorescence with a peak wavelength of 460 nm. The fluorescence intensity of Zpex and Zpex Smile was higher than that of TZ-3Y-E, with Zpex being more intense than Zpex Smile...
August 29, 2018: Dental Materials Journal
Takumi Sato, Yoshinaka Shimizu, Kenji Odashima, Yuya Sano, Akiko Yamamoto, Toshiji Mukai, Naoko Ikeo, Tetsu Takahashi, Hiroyuki Kumamoto
The present study was designed to investigate the biodegradation behavior of Mg alloy plates in the maxillofacial region. For in vitro analysis, the plates were immersed in saline solution and simulated body fluid. For in vivo, the plates were implanted into the tibia, head, back, abdominal cavity, and femur and assessed at 1, 2, and 4 weeks after implantation. After implantation, the plate volumes and the formed insoluble salt were measured via micro-computed tomography. SEM/EDX analysis of the insoluble salt and histological analysis of the surrounding tissues were performed...
August 29, 2018: Dental Materials Journal
Pavethynath Velusamy, Yasushi Shimada, Zuisei Kanno, Takashi Ono, Junji Tagami
The aim of this study was to evaluate in vitro detection of enamel white spot lesions around orthodontic brackets using swept-source optical coherence tomography (SS-OCT). Twenty-four clear orthodontic brackets were bonded onto the enamel surface of bovine incisor specimens using three types of orthodontic resin adhesives: non-fluoridated, fluoridated, and fluoridated light cured. The specimens were subjected to artificial demineralization. SS-OCT images were captured before demineralization and at 24 h and 1 week after demineralization...
August 29, 2018: Dental Materials Journal
Niko-Pekka Johannes Hoikkala, Xiaoju Wang, Leena Hupa, Jan-Henrik Smått, Jouko Peltonen, Pekka K Vallittu
Aim of the study was to evaluate apatite forming ability and ion dissolution of bioactive glass-ceramic (BGC) particles from novel polydimethylsiloxane (PDMS) based endodontic sealer Guttaflow Bioseal. Firstly, water sorption and solubility were determined for Guttaflow 2 and Guttaflow Bioseal (GB), the latter containing BGC filler particles. Mineral precipitations in simulated body fluid (SBF) were observed with SEM/EDX. Ion-release from the sealer was determined with inductively coupled plasma optical emission spectrometry (ICP-OES) in Tris-buffer solution...
August 29, 2018: Dental Materials Journal
Yasuhiro Tanimoto, Manamu Nagakura
Removable partial dentures (RPDs) with resin-clasp retentive parts, which are known as non-metal-clasp dentures (NMCDs), have been used as alternatives for conventional RPDs with metal clasp, in case of aesthetic prosthodontic treatments. In this study, a profilometer and dynamic micro-indentation tests were used to investigate the effects of polishing on the surface properties such as surface roughness (Ra), dynamic hardness, and elastic modulus of high-rigidity glass-fiber-reinforced thermoplastics (GFRTPs) composed of E-glass fibers and polypropylene for NMCDs...
August 23, 2018: Dental Materials Journal
Pipop Saikaew, Pisol Senawongse, Afm Almas Chowdhury, Hidehiko Sano, Choltacha Harnirattisai
The purpose of this study was to evaluate the effect of surface roughness and smear layer on the micro-shear bond strength (µSBS) of two self-etching adhesives, Clearfil SE Bond (SE) and Clearfil Tri-S Bond (S3). Flat dentin surfaces were prepared with SiC papers (600-, 180- and 120-grit) and diamond burs (extra fine, medium and coarse). They were further divided into smear-covered and smear-free surfaces and bonded with respective adhesives. µSBS test was performed after water storage at 37ºC for 24 h. Smear layer thickness measurement was evaluated by scanning electron microscope (SEM)...
August 23, 2018: Dental Materials Journal
Hina Khalid, Mariam Raza Syed, Muhammad Imran Rahbar, Haffsah Iqbal, Sarfraz Ahmad, Muhammad Kaleem, Jukka Pekka Matinlinna, Abdul Samad Khan
The aim of this laboratory study was to evaluate the monomer leaching and degree of conversion (DC) from experimental bioactive resin composites (RBCs) and to do comparison with commercial bulkfill and packable resin composites. Experimental dimethacrylatebased resin composites were reinforced with silanated nano-hydroxyapatite (30 and 45 wt%). The ion leaching and DC of these resin composites were compared and contrasted with SDR™ and Filtek P60™ by using the high performance liquid chromatography (HPLC) and Fourier transform infrared spectroscopy (FTIR), respectively...
August 23, 2018: Dental Materials Journal
Adil O Abdullah, Sarah Pollington, Yi Liu
The mechanical properties of temporary crowns are considered to be crucial in order to achieve successful definite restorations. This study compared marginal fit, internal fit, fracture strength and mode of fracture of CAD/CAM temporary crowns to direct chairside counterparts. An upper left first premolar Frasaco tooth was prepared for all-ceramic crown. The materials used for comparison were VITA CAD-Temp® , ArtBloc® Temp, PMMA DISK and Acrytemp (control group). The crowns were divided into four groups (n=10)...
August 23, 2018: Dental Materials Journal
Anna Sipe, Robert S Jones
Cross-polarization optical coherence tomography (CP-OCT) is a promising imaging modality to detect demineralization under the margins of composite restorations. The aim of this study was to assess how base materials applied under composite resin may affect CP-OCT image assessment. Base materials are commonly used for managing deep dentinal decay but once applied residual amounts of the base materials can be inadvertently left on the inner enamel walls. This study determined that base materials have significantly different scattering properties...
August 23, 2018: Dental Materials Journal
Akifumi Takahashi, Tomohiro Takagaki, Takahiro Wada, Motohiro Uo, Toru Nikaido, Junji Tagami
The effects of contamination and cleaning methods on bonding of self-adhesive resin cement to zirconia ceramics were examined. Airborne particle-abraded zirconia (Zpex Smile) specimens were divided into the following four groups: control (con), contaminated with saliva and cleaned with tap water (HS), cleaned with Ivoclean (IC), and cleaned with Multi Etchant (ME). The pretreated specimens were bonded using three self-adhesive resin cements, and tensile bond strengths were measured using a universal testing machine at a crosshead speed of 2 mm/min...
July 26, 2018: Dental Materials Journal
Isadora Martini Garcia, Vicente Castelo Branco Leitune, Carolina Jung Ferreira, Fabricio Mezzomo Collares
The purpose of this study was to formulate and evaluate an adhesive resin with tantalum oxide. Ta2 O5 was evaluated by scanning electron microscopy and laser diffraction. The adhesive was formulated with methacrylate monomers and photoinitiators. Ta2 O5 was added into the adhesive at 1, 2, 5 and 10 wt%. One group remained without filler (control group). Ta2 O5 distribution, radiopacity (n=5), degree of conversion (DC) (n=3), softening in solvent (n=5) and ultimate tensile strength (UTS) (n=10) were evaluated...
July 26, 2018: Dental Materials Journal
Giacomo Derchi, Michele Vano, Luca Ceseracciu, Alberto Diaspro, Marco Salerno
We investigated three bulk fill composites (Mat1, Mat2, Mat3) cured by two polywave (Poly1, Poly2) and one monowave (Mono) lamps. We used infrared spectroscopy, nanoindentation and atomic force microscopy to assess degree of conversion (DC), stiffness, and roughness after polishing, respectively. Mat2 exhibited the highest DC with Poly1 and second highest with Mono, however was the less stiff. Both Mat1 and Mat3 showed highest DC with Poly2, while Poly1 scored better than Mono. Mat3 scored better than Mat1 and was the third highest when cured with Poly2...
July 26, 2018: Dental Materials Journal
Yuki Naruse, Tomohiro Takagaki, Naoko Matsui, Takaaki Sato, Masaomi Ikeda, Toru Nikaido, Junji Tagami
The aim of this study was to evaluate how alumina-blasting pressure affects the bond strength of CAD/CAM resin blocks (CRBs) to bovine dentin using two different types of resin cements. CRB slices were divided into three groups by alumina-blasting pressure, namely, untreated and 0.1 MPa and 0.2 MPa, and further divided into three subgroups by combination of CRBs surface treatment and types of cement: Scotchbond Universal and RelyX ultimate (RXB), Scotchbond Universal and RelyX unicem2 (U2B), ceramic primer and RelyX unicem2 (U2C)...
July 26, 2018: Dental Materials Journal
Bo Wang, Ning Zhang, Xiaomeng Wang, Soo Ro Park, Michael D Weir, Thomas W Oates, Hockin H K Xu, Yuxing Bai
Enamel demineralization is the most undesired side-effect of fixed orthodontic treatments. This study were to develop a novel adhesive that is self-etching instead of using the traditional etching method, and to form a sealant on the enamel to prevent demineralization. 2-methacryloyloxyethyl phosphorylcholine (MPC) and quaternary ammonium dimethylaminohexadecyl methacrylate (DMAHDM) were mixed into a self-etch adhesive (Adper Easy One, 3M, St. Paul, MN, USA; referred to as AEO). Enamel shear bond strength (SBS) was measured...
July 12, 2018: Dental Materials Journal
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