Blar i forfatter "Nakamura, Keisuke"

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    • Effect of cements on fracture resistance of monolithic zirconia crowns 

      Nakamura, Keisuke; Mouhat, Mathieu; Nergård, John Magnus; Lægreid, Solveig Jenssen; Kanno, Taro; Milleding, Percy; Ørtengren, Ulf Thore (Journal article; Tidsskriftartikkel; Peer reviewed, 2016-01-26)
      Objectives - The present study investigated the effect of cements on fracture resistance of monolithic zirconia crowns in relation to their compressive strength.<p> <p>Materials and methods - Four different cements were tested: zinc phosphate cement (ZPC), glass-ionomer cement (GIC), self-adhesive resin-based cement (SRC) and resin-based cement (RC). RC was used in both dual cure mode (RC-D) and ...

    • Fracture resistance of computer-aided design/computer-aided manufacturing-generated composite resin-based molar crowns 

      Harada, A; Nakamura, Keisuke; Kanno, Taro; Inagaki, R.; Ørtengren, Ulf Thore; Niwano, Y.; Sasaki, Keiichi; Egusa, Hiroshi (Journal article; Tidsskriftartikkel; Peer reviewed, 2015-02-16)
      The aim of this study was to investigate whether different fabrication processes, such as the computer-aided design/computer-aided manufacturing (CAD/CAM) system or the manual build-up technique, affect the fracture resistance of composite resin-based crowns. Lava Ultimate (LU), Estenia C&B (EC&B), and lithium disilicate glass-ceramic IPS e.max press (EMP) were used. Four types of molar crowns were ...

    • Fracture resistance of monolithic zirconia molar crowns with reduced thickness 

      Nakamura, Keisuke; Harada, A.; Inagaki, R.; Kanno, Taro; Niwano, Y.; Milleding, Percy; Ørtengren, Ulf Thore (Journal article; Tidsskriftartikkel; Peer reviewed, 2015-01-30)
      Objectives. The purpose of the present study was to analyze the relationship between fracture load of monolithic zirconia crowns and axial/occlusal thickness, and to evaluate the fracture resistance of monolithic zirconia crowns with reduced thickness in comparison with that of monolithic lithium disilicate crowns with regular thickness. Materials and methods. Monolithic zirconia crowns (Lava ...

    • Hydroxyl radicals generated by hydrogen peroxide photolysis recondition biofilm-contaminated titanium surfaces for subsequent osteoblastic cell proliferation 

      Nakamura, Keisuke; Shirato, Midori; Tenkumo, Taichi; Kanno, Taro; Westerlund, Anna; Örtengren, Ulf Tore; Sasaki, Keiichi; Niwano, Yoshimi (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-03-18)
      Titanium dental implants have been successfully used for decades; however, some implants are affected by peri-implantitis due to bacterial infection, resulting in loss of supporting bone. This study aimed to evaluate the effect of an antimicrobial chemotherapy employing H<sub>2</sub>O<sub>2</sub> photolysis—developed to treat peri-implantitis—on biofilm-contaminated titanium surfaces in association ...

    • Photo-irradiated caffeic acid exhibits antimicrobial activity against Streptococcus mutans biofilms via hydroxyl radical formation 

      Nakamura, Keisuke; Shirato, Midori; Kanno, Taro; Lingström, Peter; Ørtengren, Ulf Thore; Niwano, Yoshimi (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-07-25)
      An antimicrobial technique based on photo-oxidation of caffeic acid (CA) has recently been developed, but its effect on biofilm-forming bacteria is unknown. The present study aimed to evaluate the effect of photo-irradiated CA against Streptococcus mutans (cariogenic bacteria) biofilm as it relates to hydroxyl radical formation. S. mutans biofilms grown on hydroxyapatite disks were immersed in CA ...

    • Surface properties of dental zirconia ceramics affected by ultrasonic scaling and low-temperature degradation 

      Nakazawa, Kosuke; Nakamura, Keisuke; Harada, Akio; Shirato, Midori; Inagaki, Ryoichi; Örtengren, Ulf; Kanno, Taro; Niwano, Yoshimi; Egusa, Hiroshi (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-09-13)
      Zirconia (3Y-TZP) dental prostheses are widely used in clinical dentistry. However, the effect of ultrasonic scaling performed as a part of professional tooth cleaning on 3Y-TZP dental prostheses, especially in conjunction with low-temperature degradation (LTD), has not been fully investigated. The present study aimed to evaluate the influence of ultrasonic scaling and LTD on the surface properties ...