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Qian CHEN, Xu-Yi WEI, Mi YI, Yun-Yang BAI, Qing CAI, Xin-Zhi WANG
2015 年 34 巻 6 号 p.
740-745
発行日: 2015/11/27
公開日: 2015/12/01
ジャーナル
フリー
This paper evaluated the push-out bond strengths of glass fiber posts with poly-dopamine (poly-dopa) functionalized after etching with H
2O
2. Forty extracted human, single-rooted teeth were endodontically treated and a 9-mm post space was prepared in each tooth with post drills provided by the manufacturer. Specimens were randomly assigned into four groups (
n=10 per group), depending on post surface treatment used: group C (control); group D (poly-dopa); group H (H
2O
2); and group HD (H
2O
2+poly-dopa). The push-out test was performed using a universal testing machine. Results: Bond strengths (MPa) were as follows: 4.678±0.911 (group C); 7.909±1.987 (group D); 6.519±0.893 (group H); and 9.043±1.596 (group HD). The bond strength of the resin cement to posts functionalized with poly-dopa was not affected by H
2O
2 pre-treatment, while conditioning using H
2O
2+poly-dopa resulted in higher bond strengths than H
2O
2 treatment only. Compared to H
2O
2 treatment, the bond strength of poly-dopa conditioning was superior.
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Leila PEREA, Jukka P MATINLINNA, Mimmi TOLVANEN, Pekka K VALLITTU
2015 年 34 巻 6 号 p.
746-753
発行日: 2015/11/27
公開日: 2015/12/01
ジャーナル
フリー
To evaluate the load-bearing capacities and failure mechanisms of FRC FDPs using shell-shaped acrylic denture teeth as pontics with different composite resins as filling materials. Eighty-four inlay-retained FDPs with FRC frameworks were made using shell-shaped posterior artificial teeth as pontics. Different composite resins were used as filling materials to complete the shape of the pontics. Four groups (
n=21/group) were formed based on the filling material. Each group was subdivided into three subgroups and tested at 90º and 30°. Each FDP was statically loaded from the pontic until the final fracture. ANOVA revealed statistically significant differences in the load-bearing capacities according to filling material, angle and storage (
p<0.01). The fracture propagated from the fiber-rich part of the pontic towards the occlusal surface of the FDP. The filling material influenced the load-bearing capacities of FRC FDPs with shell-shaped denture teeth used as pontics.
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Christian MELLER, Christian KLEIN
2015 年 34 巻 6 号 p.
754-765
発行日: 2015/11/27
公開日: 2015/12/01
ジャーナル
フリー
The aim of this study was to determine singular fluorescence qualities of different, commercially available resin composites shades. A total of 234 brand name colors including enamel, dentin and special shades were examined using a monochromator-based spectrophotometer. From the examined composites, Filtek
TM Z250 (867±279) RFU and Supreme XT (dentin shades: (1,585±507) RFU; enamel shades: (4,473±330) RFU) are the only brands with a mean fluorescence maximum that resembles the fluorescence of natural samples. The shade types of the other brands showed a three to fifteen times higher mean maximum fluorescence (dentin shades: (10,331–47,774) RFU; enamel shades: (19,283–38,264) RFU; special shades: (35,934–60,001) RFU). The results of the present study supply for the first time individual fluorescence qualities of a vast sample of different composite shades, data needed not only for the development of new materials, but for diagnostic reasons in routine (re-)treatment, forensic and epidemiological endeavors.
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Cigdem ATALAYIN, Guliz ARMAGAN, Sibel KONYALIOGLU, Hande KEMALOGLU, Hu ...
2015 年 34 巻 6 号 p.
766-773
発行日: 2015/11/27
公開日: 2015/12/01
[早期公開] 公開日: 2015/10/27
ジャーナル
フリー
This study was designed to evaluate the cytotoxicity of four dentin bonding agents and the effects of an antioxidant addition. Group A: G-aenial Bond, Group B: Optibond All in One, Group C: Gluma Self Etch and Group D: Clearfil S
3 Bond were added to the medium using extract method. The cells were cultured with or without resveratrol (RES) addition. MTT, reactive oxygen species (ROS), DCF, Comet and 8-OHdG measurements were performed. The agents had a dose-dependent (1:1>1:10>1:20) cytotoxic effect. Considering 1:10 concentration; Group D at 1 h (
p<0.01) and Group B and D at 24 h had the weakest cytotoxic effect (
p<0.05). After RES addition, the highest cell viability was determined in Groups B+RES and D+RES at 1 h and in Groups A+RES and B+RES at 24 h (
p<0.01). The dentin bonding agents induced ROS production and DNA damage regarding to their composition. However, RES addition decreased the indicated parameters.
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Wei ZHANG, Bin PENG
2015 年 34 巻 6 号 p.
774-780
発行日: 2015/11/27
公開日: 2015/12/01
ジャーナル
フリー
The purpose of this study was to evaluate the reactions of rat subcutaneous connective tissue and bone tissue to iRoot SP, ProRoot MTA, and AH Plus. Specimens were implanted in the dorsal subcutaneous connective tissue and tibias of 36 Wistar rats. Tissue specimens were collected after rats were sacrificed at 7, 30, and 60 days after implantation. Histologic evaluations comprising inflammation severity and new bone formation were blindly made on hematoxylin and eosin-stained sections. In subcutaneous implant test, AH Plus group showed more infiltration of inflammatory cells than the other three groups at 30 days (
p<0.05). In intraosseous implant test, number of inflammatory cells decreased in all groups at 7, 30, and 60 days after implantation with no statistically significant differences.
Given the similar inflammatory reactions to iRoot SP and MTA, it was concluded that iRoot SP and MTA were biocompatible with the subcutaneous and intraosseous tissues of rats.
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Yusuke AOYAGI, Taira MIYASAKA, Nobuo ANDO
2015 年 34 巻 6 号 p.
781-788
発行日: 2015/11/27
公開日: 2015/12/01
ジャーナル
フリー
To improve the mechanical strength of denture base resin, several types of noble metal cluster were introduced into PMMA, and the mechanical properties and color changes were evaluated. Complex salts of gold, silver, platinum, and palladium were used as the raw materials of noble metal clusters, and after adding each cluster to MMA, polymerization and thermal treatment were performed to produce PMMA-noble metal cluster complexes. Bending deflection, bending strength, and Vickers hardness were measured, and the formation conditions of metal clusters were investigated using EPMA, SEM, and TEM. Furthermore, color changes between before and after metal cluster creation were measured. The bending deflection increased with the addition of silver and platinum, and decreased with the addition of palladium. The bending strength was lowest with the addition of gold, highest with the addition of palladium. Vickers hardness increased with the addition of palladium. Color differences increased with increasing thermal treatment temperature.
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Atsushi YASUDA, Ken MIYAZAWA, Takuma SATO, Keisuke YAGIHASHI, Shigemi ...
2015 年 34 巻 6 号 p.
789-795
発行日: 2015/11/27
公開日: 2015/12/01
ジャーナル
フリー
Articular cartilage has a low self-repair ability and natural healing cannot be expected. Treatment using various bone substitutes has been performed, but these have various disadvantages. Compared to autologous bone substitutes, the osteochondral repair ability of allogeneic bone substitutes is low, but the effective and safe utilization of these as a bone substitute may be possible by improving their osteochondral repair ability. We prepared a full-thickness osteochondral defect in the patellar fossa of rabbits, added a bisphosphonate preparation to bovine tooth-derived Demineralized Dentin Matrix (DDM), which has its own osteochondral repair ability, and investigated osteochondral repair ability in the defects. As a result, we suggest that the addition of high-dose BPs inhibits the osteochondral repair ability of DDM.
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Candida R.C. STURZ, Franz-Josef FABER, Martin SCHEER, Daniel ROTHAMEL, ...
2015 年 34 巻 6 号 p.
796-813
発行日: 2015/11/27
公開日: 2015/12/01
ジャーナル
フリー
Available chair-side surface treatment methods may adversely affect prosthetic materials and promote plaque accumulation. This study investigated the effects of treatment procedures on three resin restorative materials, zirconium-dioxide and polyetheretherketone in terms of surface roughness and hydrophobicity. Treatments were grinding with silicon carbide paper or white Arkansas stone, blasting with prophylaxis powder and polishing with diamond paste. Surface roughness was assessed using confocal laser scanning. Hydrophobicity as measured by water contact angle was determined by computerized image analysis using the sessile drop technique. All of the specific surface treatments performed led to significant changes in contact angle values and surface roughness (Ra) values. Median contact angle values ranged from 51.6° to 114°. Ra values ranged from 0.008 µm to 2.917 µm. Air-polishing as well as other polishing procedures increased surface roughness values in all materials except zirconium dioxide. Polyetheretherketone displayed greatest change in contact angle values after air-polishing treatment.
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Toshihiro IMAMURA, Zuisei KANNO, Haruki IMAI, Tomoko SUGIYAMA, Takahir ...
2015 年 34 巻 6 号 p.
814-821
発行日: 2015/11/27
公開日: 2015/12/01
ジャーナル
フリー
Although the accumulation and distribution of metals from metallic orthodontic appliances in the oral mucosa have been studied extensively, they remain unclear because their concentration is quite low. In this study, metal specimens (Ni, Ni-Ti, and Co-Cr) were sutured in the unilateral oral mucosa of rats, and the distribution of the eluted elements in the mucosal tissue was estimated using inductively coupled plasma mass spectrometry (ICP-MS) and synchrotron radiation X-ray fluorescence analysis (SR-XRF). While the infiltrations of Ni, Co, and Cr into the oral mucosal connective tissue were observed with SR-XRF, significant increases were only found in Ni from the pure Ni group and Cr from the Co-Cr group. Furthermore, Ni and Co were estimated as hydrated ions while Cr was estimated in oxide form through X-ray absorption fine structure (XAFS) analysis.
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Marcelo GIANNINI, Tomohiro TAKAGAKI, Renata BACELAR-SÁ, Paulo Moreira ...
2015 年 34 巻 6 号 p.
822-827
発行日: 2015/11/27
公開日: 2015/12/01
ジャーナル
フリー
This study evaluated the effect of resin coating (COA) on dentin bond strength (BS) of five resin cements (RC). Ten groups were tested, according to RC and COA combinations. RCs were applied onto prepolymerized resin discs, which were bonded to dentin surfaces. Teeth were stored in water for 24 h, subjected to 5,000 thermocycles and sectioned to obtain beams, which were tested in tension. The COA increased the BS for Panavia F2.0, RelyX Unicem, and RelyX Unicem 2, whereas no changes in BS were observed for two other RCs; Clearfil SA Cement, which showed the lowest BS among groups with COA and G-Cem, which showed the highest BS among RCs without COA. COA can increase the BS of RC depending on the type of RC.
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Irma DUMBRYTE, Tomas JONAVICIUS, Laura LINKEVICIENE, Tomas LINKEVICIUS ...
2015 年 34 巻 6 号 p.
828-834
発行日: 2015/11/27
公開日: 2015/12/01
ジャーナル
フリー
The objective of this
in vitro study was to evaluate the effect of the enamel cracks on the tooth damage during the debonding. Measurements of the cracks characteristics (visibility, direction, length, and location) were performed utilizing a scanning electron microscopy (SEM) technique and mathematically derived formulas (x=h/30, l=n*x) before and following the removal of mechanically retained metal and ceramic brackets. The likelihood of having greater extent enamel defects was higher for the teeth with pronounced cracks (odds vatios, OR=3.728), increased when the crack was located in more than one zone of the tooth (OR=1.998), and the inclination did not exceed 30–45° (OR=0.505). Using ceramic brackets the risk of greater amount tooth structure defects raised 1.45 times (OR=1.450). Enamel crack showing all these characteristics at the beginning of the orthodontic treatment and the use of ceramic brackets might predispose to higher risk of greater extent tooth surface damage after the debonding by 20.4%.
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So-Ri KIM, Wan-Sun LEE, Woong-Chul KIM, Hea-Young KIM, Ji-Hwan KIM
2015 年 34 巻 6 号 p.
835-840
発行日: 2015/11/27
公開日: 2015/12/01
ジャーナル
フリー
The purpose of this study was to evaluate the digitization of alginate impressions by analyzing differences between the scan data of two types of impressions (alginate and rubber) taken from the master die and the scan data for the master die. The master die and impressions were digitized using a dental laser scanner (7 series, Dental Wings, Montreal, Canada). The crown portion of the abutment teeth in the digital data of 20 impressions was divided into three regions: cervical surface, middle surface, and occlusal surface. An independent
t-test showed a significant difference (
p<0.05) in the mean difference for each experimental group (alginate and rubber). One-way ANOVA and Tukey’s honest significant difference test revealed a significant difference (
p<0.05) among the three regions in the rubber impression. The results of this study also carefully suggest the possibility of digitization of alginate impressions in the future.
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Satoki KAWASHIMA, Koichi SHINKAI, Masaya SUZUKI
2015 年 34 巻 6 号 p.
841-846
発行日: 2015/11/27
公開日: 2015/12/01
ジャーナル
フリー
We aimed to evaluate the microtensile bond strength (µTBS) of experimentally developed all-in-one adhesives containing surface reaction-type pre-reacted glass-ionomer (S-PRG) filler as a direct pulp-capping agent. Flattened dentin surfaces of extracted human molars were treated with four experimental adhesives of different S-PRG filler content (group 1: 0 wt%, group 2: 13 wt%, group 3: 27 wt% and group 4: 40 wt%) and Fluorobond Shakeone as the control. The beam samples were made and attached to the testing device, placed onto the tabletop-material-tester, and subjected to µTBS test. The data were statistically analyzed using one-way ANOVA. The results demonstrated that the µTBS value of group 2 was significantly lower than that of the control. No other significant differences among the µTBS values of groups and control were observed. It was concluded that the µTBS values of the experimental adhesives were not affected by the S-PRG filler contents except in group 2.
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Yuki RAITA, Koichiro KOMATSU, Tohru HAYAKAWA
2015 年 34 巻 6 号 p.
847-854
発行日: 2015/11/27
公開日: 2015/12/01
ジャーナル
フリー
The aim of the present study was to evaluate the gingival connective tissue response to screw-type titanium implants coated with Type I collagen nanofibers, which were prepared using the electrospray deposition method. Implants were immediately inserted into the socket of maxillary first molars after the extraction. Undecalcified sections after 4 weeks implantation were histologically observed. Better contact of the gingival connective tissue was generally observed around the collagen nanofiber-coated implants than titanium and non-fibrous collagen-immobilized implants. Gingival connective tissue to implant contact was significantly greater with the collagen nanofiber-coated implants than with the titanium and collagen-immobilized implants at the distal side, but not at the mesial side. Polarized light microscopy revealed that some birefringent collagen fiber bundles are oriented perpendicularly to the implant surfaces in the gingival connective tissue adjacent to the collagen nanofiber-coated implants. Collagen nanofiber-coating may have a possibility for improving gingival connective tissue response to titanium implants.
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Fumi YOSHIDA, Akimasa TSUJIMOTO, Ryo ISHII, Kie NOJIRI, Toshiki TAKAMI ...
2015 年 34 巻 6 号 p.
855-862
発行日: 2015/11/27
公開日: 2015/12/01
ジャーナル
フリー
This study investigates the influence of surface treatment of contaminated lithium disilicate and leucite glass ceramic restorations on the bonding efficacy of universal adhesives. Lithium disilicate and leucite glass ceramics were contaminated with saliva, and then cleaned using distilled water (SC), or 37% phosphoric acid (TE), or hydrofluoric acid (CE). Specimens without contamination served as controls. The surface free energy was determined by measuring the contact angles formed when the three test liquids were placed on the specimens. Bond strengths of the universal adhesives were also measured. Saliva contamination and surface treatment of ceramic surfaces significantly influenced the surface free energy. The bond strengths of universal adhesives were also affected by surface treatment and the choice of adhesive materials. Our data suggest that saliva contamination of lithum disilicate and leucite glass ceramics significantly impaired the bonding of the universal adhesives, and reduced the surface free energy of the ceramics.
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Mayo TAKADA, Koichi SHINKAI, Chikage KATO, Masaya SUZUKI
2015 年 34 巻 6 号 p.
863-871
発行日: 2015/11/27
公開日: 2015/12/01
ジャーナル
フリー
We aimed to examine the effect of various adhesive systems on the bond strength of composite resin to enamel or dentin prepared with erbium, chromium: yttrium scandium gallium garnet (Er,Cr:YSGG) laser. Each laser-cut enamel or dentin surface was treated with a bonding agent (SBB, Group 1); self-etching primer (SBP) and SBB (Group 2 and control); phosphoric-acid (KET), SBP and SBB (Group 3); KET, sodium-hypochlorite (ADG), SBP and SBB (Group 4); all-in-one adhesive (TSB, Group 5); or KET, ADG and TSB (Group 6). The control group was only polished with wet silicon carbide papers. The enamel shear bond strength of Group 5 was significantly lower than that of other groups (
p<0.01). The control group showed higher bond strength compared to Groups 1–6 (
p<0.05). Preconditioning using phosphoric acid or phosphoric acid followed by sodium hypochlorite increased the bond strength of composite resin to enamel and dentin prepared using an Er,Cr:YSGG laser.
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Tomoki HIRANO, Hodaka SASAKI, Shinya HONMA, Yoshitaka FURUYA, Tadashi ...
2015 年 34 巻 6 号 p.
872-880
発行日: 2015/11/27
公開日: 2015/12/01
ジャーナル
フリー
The purpose of this study was to elucidate behavior of human mesenchymal stem cells (hMSCs) on yttria stabilized tetragonal zirconia polycrystals (TZP) and commercial pure titanium (CpTi) with different surface topography. Mirror-polished (MS), sandblasted with 150-μm alumina (SB150) and SB150 acid-etched (SB150E) were prepared on TZP and CpTi. Proliferation, osteogenic differentiation of hMSCs was evaluated. The scanning electron microscopy showed that micro- and nano-topographies were created on both TZP and CpTi SB150E surfaces. The proliferation ability, ALP activity, expression of
Runx2 on the both SB150E specimens was significantly higher than those on the other specimens. These results suggested that creation of micro- and nano-topographies on TZP and CpTi by blast and acid-etching may offer a promising method for enhancing the proliferation and differentiation of hMSCs in clinical application.
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Hiroyasu KOIZUMI, Osamu SAIKI, Hiroshi NOGAWA, Haruto HIRABA, Tomoyo O ...
2015 年 34 巻 6 号 p.
881-887
発行日: 2015/11/27
公開日: 2015/12/01
ジャーナル
フリー
The purpose of this study was to evaluate the gloss and surface roughness behaviors of newly developed CAD/CAM composite blocks with different filler contents and characteristics. The gloss and surface roughness were quantified before and after a toothbrush dentifrice abrasion test; the results were compared to the gloss and surface roughness of a ceramic CAD/CAM block. Knoop hardness was determined before abrasion test. The results were analyzed by ANOVA, Tukey HSD, and Dunnett
t test (
p<0.05). The rank order of Knoop hardness was as follows: Vita Mark II>Vita Enamic>Gradia block>Shofu Block HC, Lava Ultimate≥Katana Avencia block≥Cerasmart. After toothbrush abrasion, a significant difference in the gloss unit was detected between the Shofu Block HC material and the ceramic block. The Ra and Rz of the Cerasmart and Shofu Block HC materials were significantly larger than those of the ceramic block after toothbrush abrasion.
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Shun AKAIKE, Tohru HAYAKAWA, Daishiro KOBAYASHI, Yuko AONO, Atsushi HI ...
2015 年 34 巻 6 号 p.
888-895
発行日: 2015/11/27
公開日: 2015/12/01
ジャーナル
フリー
In orthodontics, a reduction in static friction between the brackets and wire is important to enable easy tooth movement. The aim of this study was to examine the effects of a homogeneous diamond-like carbon (DLC) coating on the whole surfaces of slots in stainless steel orthodontic brackets on reducing the static friction between the brackets and the wire. The DLC coating was characterized using Raman spectroscopy, surface roughness and contact angle measurements, and SEM observations. Rectangular stainless steel and titanium-molybdenum alloy wires with two different sizes were employed, and the static friction between the brackets and wire was measured under dry and wet conditions. The DLC coating had a thickness of approximately 1.0 μm and an amorphous structure was identified. The results indicated that the DLC coating always led to a reduction in static friction.
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Yasuhiro KATSUTA, Fumihiko WATANABE
2015 年 34 巻 6 号 p.
896-902
発行日: 2015/11/27
公開日: 2015/12/01
ジャーナル
フリー
Cyclic torsional loading tests were carried out in the laboratory using various implant systems, in order to clarify differences between the systems in loosening of abutment screws. Six samples from six commercially available abutment systems were used, giving a total of 36 samples. Four of the systems used internal connections, and two used external connections. The abutment screw for each system was tightened to a torque value specified by the manufacturer, and after 5 min, the loosening torque was measured using a digital torque meter. Measurements were taken twice, and a second measurement was taken as a reference value. A cyclic torsional loading test with 100,000 cycles was performed on the sample, and the loosening torque was again measured after the test. In conclusion, loosening of the abutment screw occurred as a result of cyclic torsional loading, and the degree of loosening varied with each implant system.
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Xin ZHOU, Shan JIANG, Xiao WANG, Shuai WANG, Xiaofei ZHU, Chengfei ZHA ...
2015 年 34 巻 6 号 p.
903-909
発行日: 2015/11/27
公開日: 2015/12/01
ジャーナル
フリー
This study compared dentinal and apical crack formation after instrumentation with different nickel-titanium systems at two different working lengths (WL) in large and small canals. Two hundred and eighty human teeth were randomly distributed into two control and 12 experimental groups (
n=20 each). Large and small canals were instrumented by the WaveOne, Protaper Universal System (PTU), Twisted File (TF), or Twisted File Adaptive (TFA) at 1 mm shorter than canal length (CL−1 mm) or 1 mm beyond apical foreman (CL+1 mm). Horizontal sections were microscopically observed to evaluate the dentinal cracks (only large canals). Scanning electron microscopy images were taken before and after instrumentation to assess apical cracks. All file types caused more apical cracks in small canals than in large canals regardless of the WL. During over-instrumentation (WL=CL+1 mm), the WaveOne and PTU groups developed significantly more dentinal cracks at the 6 and 9 mm sections than the TF and TFA groups.
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Fumiyori MATSUZAKI, Hideshi SEKINE, Shinya HONMA, Takuya TAKANASHI, Ka ...
2015 年 34 巻 6 号 p.
910-917
発行日: 2015/11/27
公開日: 2015/12/01
ジャーナル
フリー
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.
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Rino HARADA, Shinji TAKEMOTO, Masayuki HATTORI, Masao YOSHINARI, Yutak ...
2015 年 34 巻 6 号 p.
918-924
発行日: 2015/11/27
公開日: 2015/12/01
ジャーナル
フリー
This study investigated the effects of different colored tetragonal zirconia polycrystal (TZP) core on the optical properties of TZP framework restorations. Three various colors of TZP discs (Katana Zirconia) 14 mm in diameter and 0.5 mm thickness were layered with 2 shades of veneering ceramics (shade A1 and A4: Cerabian ZR). These specimens were polished to approximately 1.5 mm. CIE
L*a*b* coordinates, translucency (TP), and opalescence (OP) on the TZP restorations were evaluated. Consequently, TZP core color affected CIE
L*a*b* values of TZP restorations however TP and OP did not significantly differ among the 3 core colors. Translucency and opalescence for colored TZP framework restorations were not influenced by the underlying TZP core color when veneering ceramics were layered to thicknesses of 1.0±0.1 mm.
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