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Dental Materials Journal

Alghamdi Ali, Tomohiro Takagaki, Yuki Naruse, Ahmed Abdou, Toru Nikaido, Masaomi Ikeda, Junji Tagami
The aim of this study was to evaluate the time elapsed bond strength of the CAD/CAM resin block (CRB) to bovine dentin after alumina blasting. CRB (KATANA AVENCIA BLOCK) slices were ground with #600-SiC paper and divided into three groups according to alumina blasting pressure -0.1 MPa, 0.2 MPa or untreated- and then divided into two subgroups according to the time elapsed after alumina blasting -same-day or one-week "dry-storage" at controlled laboratory conditions before cementation. The CRB slices were then cemented to bovine dentin with Panavia V5 (Kuraray Noritake Dental), and divided into two subgroups -light curing or chemical curing...
February 1, 2019: Dental Materials Journal
Hiroyuki Arikawa, Yoshito Minesaki, Koichi Muraguchi, Hiroshi Kono, Masafumi Kikuchi
The aim of this study was to clarify the temperature dependence of color, i.e. the thermochromism of restorative composite resins at typical intraoral temperatures. Five brands of restorative composite resins were used. The CIE L*a*b* color values were measured using a spectrophotometer at specimen temperatures of 4, 23, 37, 60, and 80ºC. The temperature dependence of the refractive index of the materials at 4-80ºC were also determined using a refractometer. The values of L* for all materials decreased, and those of a* and b* for most of the materials increased, with increasing temperature...
February 1, 2019: Dental Materials Journal
Fehmi Gönüldaş, Caner Öztürk, Pelin Atalay, Derya Öztaş
The effect of surface finishing techniques on machinable ceramics to obtain optimum smoothness is unclear. The aim of the study was to evaluate the effects of surface finishing techniques on machinable feldspathic and leucite-reinforced ceramics. Forty specimens were divided into four subgroups according to surface finishing techniques and ceramic structure. A profilometer was used to evaluate surface roughness. A spectrophotometer was used to obtain the CIE L*, a* and b* coordinates. All specimens were subjected to a threepoint bending test to determine flexural strength...
February 1, 2019: Dental Materials Journal
Nattawit Niyomsujarit, Pisol Senawongse, Choltacha Harnirattisai
This study determined the micro-shear bond strength (µSBS) of two self-etching adhesives to dentin surface after smear layer removal with a novel ultrasonic brushing method. Ninety-five dentin discs were ground flat with diamond burs and divided into 5 groups; no treatment (control), brushing with a custom-made brush for 10 and 30 s without and with ultrasonic application. The smear layer thickness was evaluated using SEM. The 24 h µSBS of Clearfil SE Bond (CSE) and Clearfil Tri S Bond (CTS) to these dentin surfaces were evaluated...
February 1, 2019: Dental Materials Journal
Mihriban Dudu Gizem Gençer, Zuhal Kirzioğlu
This study aimed to evaluate color masking effect from treatments with resin infiltrant and two different remineralization agents applied with microabrasion to anterior teeth with developmental enamel defects. The incisors of patients aged 8-17 were evaluated. The study involved two groups including fluorosis (Group 1) and hypomineralization (Group 2) cases. These two groups were further divided based on the treatment received: Group A: Icon® , Group B: Opalustre® +Clinpro White Varnish® , and Group C: Opalustre® +Tooth Mousse® ...
February 1, 2019: Dental Materials Journal
Sumiyo Suzuki, Yu Kataoka, Masafumi Kanehira, Mikihiro Kobayashi, Takashi Miyazaki, Atsufumi Manabe
This study aimed to non-destructively analyze the progression of subsurface enamel caries using swept-source optical coherence tomography (SS-OCT), a recently developed imaging analysis modality. Artificial enamel caries at various stages of demineralization were created in bovine tooth enamel using a modified lactic acid gel system. Untreated enamel served as a control. OCT images from cross-sections of enamel were collected. Mineral density, distribution, and histological changes were analyzed using an electron probe microanalyzer, scanning electron microscopy, and contact microradiography...
February 1, 2019: Dental Materials Journal
Matej Par, Nika Spanovic, Ruza Bjelovucic, Danijela Marovic, Gottfried Schmalz, Ozren Gamulin, Zrinka Tarle
The aim of this study was to evaluate water sorption and solubility of two series of experimental composites containing amorphous calcium phosphate (ACP) or bioactive glass (BG). Water sorption and solubility were measured for up to 287 days. The surface precipitation of calcium phosphates was evaluated by scanning electron microscopy. The ACP-series showed higher water sorption (223-568 µg/mm3 ) than the BG-series (40-232 µg/mm3 ). In contrast, the ACP-series had generally lower solubility (37-106 µg/mm3 ) than the BG-series (1-506 µg/mm3 )...
February 1, 2019: Dental Materials Journal
Yusuke Yoshikawa, Katsunori Torii, Masahiro Tanaka
Telescopic crowns made from zirconia/alumina can be manufactured using computer-aided design/computer-aided manufacturing systems. For their successful clinical use, a suitable retentive force must be maintained over an extended period. However, it is unclear how retentive force and secondary crown settling change after repeated crown insertion and removal. The aim of the present study was to investigate the changes in retentive force and secondary crown settling of telescopic crowns made from zirconia/alumina...
December 19, 2018: Dental Materials Journal
Shota Hayashi, Shinya Homma, Takuya Takanashi, Tomoki Hirano, Masao Yoshinari, Yasutomo Yajima
To clarify the influence of translucent tetragonal zirconia polycrystals (TZP) on wear properties of esthetic dental materials, twobody wear test was performed using translucent TZP as abrader specimen, and bovine tooth enamel (BTE), two resin composites including hybrid filler (CRH) and nano filler (CRN), two glass ceramics including leucite reinforced feldspar porcelain (POR) and lithium disilicate (LDC), or translucent TZP as substrate specimen. After the wear test, wear volume were determined from substrate specimen and surface roughness were measured from abrader specimen...
December 11, 2018: Dental Materials Journal
Ying Li, Baoe Li, Yunjia Song, Aobo Ma, Changyi Li, Xu Zhang, Hongjie Li, Qian Zhang, Kai Zhang
To improve initial osteoblast adhesion and subsequent osseointegration, TiO2 nanotubes layer was constructed on the titanium (Ti) surface by anodic oxidation (AO), with an additional hydroxyapatite (HA) coating to form the AO/HA surface. Tests on in vitro cellular activity displayed that the AO surface, especially the AO/HA surface, promoted initial adhesion, proliferation and differentiation of osteoblast cells. The modified AO and AO/HA surfaces further presented an up-regulated gene expression of osteogenic and adhesion markers collagen type 1 (COL), osteopontin (OPN), osteocalcin (OCN) and vinculin...
December 11, 2018: Dental Materials Journal
Yener Okutan, Munir Tolga Yucel, Tugce Gezer, Mustafa Borga Donmez
This study examined the surface roughness (Ra ) and shear bond strength (SBS) of Yttria-stabilized tetragonal zirconia polycrystalline (Y-TZP) ceramic after airborne particle abrasion at different pressures and particle sizes, pre- and post-sintering. Ninety specimens, prepared from Y-TZP ceramic blocks (Vita In-Ceram YZ, Vita Zahnfabrik), were divided into nine subgroups: control, and 50 and 110 µm Al2 O3 airborne particle abrasion at 3 and 4 bar pressure, before and after sintering, respectively. According to the sintering order, before and after surface treatments, Ra values were measured using a profilometer...
December 11, 2018: Dental Materials Journal
Masahiro Iijima, Rina Ishikawa, Kyotaro Kawaguchi, Shuichi Ito, Takashi Saito, Itaru Mizoguchi
We investigated the effects of the weekly application of pastes containing a surface reaction-type pre-reacted glass-ionomer (S-PRG) filler on dentin remineralization. Human dentin blocks were demineralized and polished using pastes containing S-PRG filler (0, 5, and 30%), and then immersed in remineralizing solution for 1 month. Nanoindentation testing was carried out during the immersion period, and the dentin surfaces were examined using scanning electron microscopy. A nano-hydroxyapatite-containing paste was used for comparison...
December 11, 2018: Dental Materials Journal
Thiago Soares Porto, Renato Cassio Roperto, Anna Akkus, Ozan Akkus, Sorin Teich, Fady Faddoul, Sizenando Toledo Porto-Neto, Edson Alves Campos
Computer-aided design/computer-aided manufacturing (CAD/CAM) materials were submitted to thermocycling, to identify changes in mechanical behavior. Four CAD/CAM materials were divided in four subordinate groups (n=9): (1) dry out for 7 days, (2) distilled water at 37o C for 7 days, (3) 60,000 thermocycles, and (4) 120,000 thermocycles. Following thermocycling, samples were submitted to three-point bending test. Two-way ANOVA and post-hoc Tukey's test were performed (α=0.05). The IPS e.max CAD had a flexural strength of 396±75 MPa and flexural modulus of 84±11 GPa, followed by Vita Enamic with values of 153±17 MPa and 28±5 GPa respectively...
December 11, 2018: Dental Materials Journal
Amr Saad, Go Inoue, Toru Nikaido, Ahmed M A Abdou, Mahmoud Sayed, Michael F Burrow, Junji Tagami
This study evaluated the effect of two hemostatic agents on bond strength of resin-modified glass ionomer cement (RMGIC) to root dentin after using different pretreatment solutions compared to resin composite with a 2-step self-etch adhesive. Dentin specimens were either uncontaminated or contaminated with a ferric sulphate or aluminum chloride astringent, RMGIC was applied after conditioning with; Cavity Conditioner, Self Conditioner or Clearfil SE Primer, while a resin composite was bonded using Clearfil SE Bond...
December 1, 2018: Dental Materials Journal
Peng Zhang, Lin Ding, Shohei Kasugai
Bio-Oss (BO), one of the bone substitutes, is extensively used for augmentation in dental field because it is highly biocompatible and osteoconductive, which however does not stimulate bone formation. Doxycycline (DOX), a widely-used antibiotic, shows inhibitory effects on inflammation and osteoclastogenesis, and it has been reported to stimulate bone formation. The objective of this study is to investigate the vertical bone formation with DOX doped BO in guided bone regeneration on rat calvaria. Forty rats underwent calvarial vertical augmentation surgeries...
December 1, 2018: Dental Materials Journal
Nazmiye Dönmez, Ayça Sarıalioğlu Güngör, Barış Karabulut, Şeyda Hergüner Siso
The micro-tensile bond strengths (micro-TBSs) of four universal adhesive systems, applied in two different bonding techniques, to carries-affected dentin after Er:YAG laser irradiation were investigated. Twenty-four extracted human molars were divided into four groups, according to the adhesive systems used. Each group was subdivided into two subgroups, depending on the bonding method used: the etch-and-rinse procedure or self-etch procedure. The carious lesions were irradiated using an Er:YAG laser. Resin composites were used to restore the adhesive-treated dentin surfaces...
December 1, 2018: Dental Materials Journal
Xianju Xie, Lin Wang, Dan Xing, Manlin Qi, Xiaodong Li, Jirun Sun, Mary Anne S Melo, Michael D Weir, Thomas W Oates, Yuxing Bai, Hockin H K Xu
The objectives were to develop a novel rechargeable cement containing amorphous calcium-phosphate nanoparticles (nanoACP) to suppress tooth decay. Five cements were made with: (1) 60% glass particles (experimental control); (2) 40% glass+20% nanoACP; (3) 30% glass+30% nanoACP; (4) 20% glass+40% nanoACP; (5) 10% glass+50% nanoACP. Groups 1-4 had enamel bond strengths similar to Transbond XT (3M) and Vitremer (3M) (p>0.1). The nanoACP cement had calcium and phosphate ion release which increased with increasing nanoACP fillers...
December 1, 2018: Dental Materials Journal
Jean-Sean Tay, Billy Bing Liang Choong, Ing Hong Ooi, Bee Siew Tan
The purpose of this study was to investigate the effect of substituting triethyleneglycol dimethacrylate (TEGDMA) with 2,2,2-trifluoroethyl methacrylate (TFEMA) on water sorption, water solubility, degree of conversion, polymerization shrinkage, fluoride release and flexural strength of bisphenol-A-glycerolate dimethacrylate (Bis-GMA)/TEGDMA/urethane dimethacrylate (UDMA) dental composites. Flexural strength, water sorption and water solubility were measured according to ISO 4049 standard. Degree of conversion was determined by FTIR technique...
December 1, 2018: Dental Materials Journal
Ruizhi Yin, Min-Ho Lee, Tae-Sung Bae, Kwang-Yeob Song
This study was to evaluate the load bearing capacity of monolithic dental zirconia crowns, and the effect of surface finishing on fracture strength. (1) The zirconia plates were divided into 5 groups and polished by various types of polishing bur, every specimen was analyzed by surface roughness testing, and X-ray diffraction (XRD). (2) The zirconia crowns were classified into 4 groups corresponding to different surface treatments and thickness. All the crowns were cemented and subjected to a load of 7 kg for 5 min...
December 1, 2018: Dental Materials Journal
Takuya Murata, Toshio Maseki, Yoichiro Nara
The effects of immediate dentin sealing (IDS) applications on the bonding of computer-aided design/computer-aided manufacturing (CAD/CAM) ceramic onlay restorations after cyclic loading were examined. Standardized mesial-distal-occlusal-palatal cavities in 32 extracted human molars were prepared. The cavities were divided into four groups: those receiving thin-layered (T), slope-shaped (S), and base-shaped (B) sealing, and the non-sealing group (N) as a control. The intra-cavity dentin walls of the T, S, and B groups were sealed with an all-in-one adhesive and a flowable composite...
November 30, 2018: Dental Materials Journal
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