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Journal of Prosthodontic Research

Yuka Tanaka, Hiroshi Shiga
PURPOSE: To clarify whether the occlusal state affects the masticatory performance of elderly adults. METHODS: Elderly women were asked to chew a gummy jelly, and the amount of glucose extraction was measured as the parameter for masticatory performance. Subjects were divided into five groups depending on occlusal support on the habitual chewing side (G1: no occlusal support of posterior teeth, G2: occlusal support of first premolar, G3: occlusal support of premolars, G4: occlusal support from first premolar to first molar, and G5: occlusal support from first premolar to second molar)...
March 9, 2018: Journal of Prosthodontic Research
Shigeto Koyama, Hiroyasu Kanetaka, Yoshinori Sagehashi, Keiichi Sasaki, Naoko Sato
PURPOSE: Patients treated with maxillofacial prosthetics often experience emotional problems because of the remaining facial skin concavity such as a surgical scar. In such cases, cosmetic treatment can potentially correct their skin tone imperfections and deformities. This study aimed to evaluate the clinical availability of novel cosmetics-based material for craniofacial small concavity by initiating a cosmetic treatment in a preliminary case. METHODS: Eighteen patients with aesthetic problems such as craniofacial deformities, small defects, and concavities on their faces underwent cosmetic treatment that was performed by makeup practitioners...
March 8, 2018: Journal of Prosthodontic Research
Makiko Takashima, Yoshiaki Arai, Atsushi Kawamura, Katsumi Uoshima
PURPOSE: This study analyzed risk factors for post-loading implant loss in cases of implant-supported prostheses applied to edentulous jaws of Japanese patients. METHODS: In total, 245 dental implant fixtures placed in 54 edentulous jaws of 46 patients performed at Niigata University Hospital were retrospectively analyzed. Kaplan-Meier curves were used to estimate the cumulative survival rate (SR) of implants, and multiple Cox regression analysis was used to identify predictive factors of implant loss...
March 8, 2018: Journal of Prosthodontic Research
Hironari Hayama, Kenji Fueki, Juro Wadachi, Noriyuki Wakabayashi
PURPOSE: It remains unclear whether digital impressions obtained using an intraoral scanner are sufficiently accurate for use in fabrication of removable partial dentures. We therefore compared the trueness and precision between conventional and digital impressions in the partially edentulous mandible. METHODS: Mandibular Kennedy Class I and III models with soft silicone simulated-mucosa placed on the residual edentulous ridge were used. The reference models were converted to standard triangulated language (STL) file format using an extraoral scanner...
March 1, 2018: Journal of Prosthodontic Research
Yasuhiro Tanimoto, Manamu Nagakura, Norihiro Nishiyama
PURPOSE: The purpose of this study was to investigate the combined effects of fiber loading and pigmentation on the color differences and flexural properties of glass fiber-reinforced thermoplastics (GFRTPs), for use in non-metal clasp dentures (NMCDs). METHODS: The GFRTPs consisted mainly of E-glass fibers, a polypropylene matrix, and a coloring pigment: the GFRTPs with various fiber loadings (0, 10, and 20mass%) and pigmentations (0, 1, 2, and 4mass%) were fabricated by using an injection molding...
February 20, 2018: Journal of Prosthodontic Research
Takuya Kobayashi, Masafumi Kubota, Toshiyuki Takahashi, Ayaka Nakasato, Taro Nomura, Junichi Furuya, Hisatomo Kondo
PURPOSE: One of the most prominent issues in a super-aging society is the rapid increase in dementia patients. Cross-sectional studies in dentistry have indicated that patients with dementia have worse oral health compared to healthy people. The purpose of this study was to clarify the influence of tooth loss on brain structure by comparing the volumes of gray matter (GM) and white matter (WM) between edentulous and dentulous subjects. METHODS: Subjects were recruited from the Denture Clinic at Iwate Medical University Hospital Dental Center...
February 20, 2018: Journal of Prosthodontic Research
Akiko Tsujisaka, Shingo Haraki, Shigeru Nonoue, Akira Mikami, Hiroyoshi Adachi, Takahiro Mizumori, Hirofumi Yatani, Atsushi Yoshida, Takafumi Kato
PURPOSE: Concomitant occurrence of respiratory events can be often overlooked in the clinical practice of SB. This study assessed physiological characteristics of rhythmic masticatory muscle activity (RMMA) and concomitant respiratory events in young SB subjects asymptomatic to obstructive sleep apnea (OSA). METHODS: Twenty-two subjects (age: 24.1±1.9years; F 8: M 14; BMI: 20.2±1.9kg/m2 ) were polysomnographically diagnosed as moderate-severe SB. Sleep architecture, oromotor (RMMA and non-specific masseter activity [NSMA]) and apnea/hypopnea events were scored...
February 20, 2018: Journal of Prosthodontic Research
Mana Torii, Toyoki Nakata, Kazuya Takahashi, Noboru Kawamura, Hidemasa Shimpo, Chikahiro Ohkubo
PURPOSE: With computer-aided design and computer-aided manufacturing (CAD/CAM), the study was conducted to create a removable partial denture (RPD) framework using repeated laser sintering rather than milling and casting techniques. This study experimentally evaluated the CAM clasp and compared it to a conventional cast clasp. METHODS: After the tooth die was scanned, an Akers clasp was designed using CAD with and without 50μm of digital relief on the occlusal surface of the tooth die...
February 7, 2018: Journal of Prosthodontic Research
Yuya Baba, Yusuke Sato, Gaku Owada, Shunsuke Minakuchi
PURPOSE: Effective denture plaque control is necessary in elderly individuals to prevent oral and systemic diseases. However, comparative studies of denture cleaning methods are limited, especially those investigating patient satisfaction. The present study aimed to evaluate effectiveness of a mechanical denture cleaning method versus a combination of mechanical and chemical methods in terms of denture cleanliness, patient satisfaction, and oral health-related quality of life (OHRQoL)...
February 7, 2018: Journal of Prosthodontic Research
Franz Sebastian Schwindling, Michael Raedel, Nicole Passia, Sandra Freitag-Wolf, Stefan Wolfart, Wael Att, Torsten Mundt, Daniel Reissmann, Fadi Ismail, Valerie von Königsmark, Matthias Kern
PURPOSE: A single implant can be placed to retain an overdenture in the edentulous mandible. This study aimed at the development of Oral Health-related Quality of Life comparing immediate and delayed implant loading, i.e., loading after 3 months of submerged healing. METHODS: In a randomized controlled trial, 158 participants received a single mandibular implant in the midline. Quality of life was measured using the summary score of the German 49-item Oral Health Impact Profile at baseline, one month after implant placement (direct loading group) as well as one and four months after loading...
February 2, 2018: Journal of Prosthodontic Research
Toshio Arakida, Manabu Kanazawa, Maiko Iwaki, Tetsuya Suzuki, Shunsuke Minakuchi
PURPOSE: This study evaluated the influence of illuminance and color temperature of ambient light on the trueness, precision, and scanning time of a digital impression. METHODS: Master data were acquired with a high-accuracy coordinate-measuring machine. The illuminance of ambient light was set at 0lux, 500lux, and 2500lux with a light-emitting diode (LED). Using a conversion filter, the color temperature was set at 3900 Kelvin (K) (yellow), 4100K (orange), 7500K (white), and 19,000K (blue)...
January 31, 2018: Journal of Prosthodontic Research
Keita Taguchi, Keiichi Hosaka, Masaomi Ikeda, Ryuzo Kishikawa, Richard Foxton, Masatoshi Nakajima, Junji Tagami
PURPOSE: The use of warm air-blowing to evaporate solvents of one-step self-etch adhesive systems (1-SEAs) has been reported to be a useful method. The purpose of this study was to evaluate the effect of warm air-blowing on root canal dentin. METHODS: Four 1-SEAs (Clearfil Bond SE ONE, Unifil Core EM self-etch bond, Estelink, BeautiDualbond EX) were used. Each 1-SEA was applied to root canal dentin according to the manufacturers' instructions. After the adhesives were applied, solvent was evaporated using either normal air (23±1°C) or warm air (80±1°C) for 20s, and resin composite was placed in the post spaces...
January 31, 2018: Journal of Prosthodontic Research
Ayaka Yanagi, Yuka Sumita, Mariko Hattori, Ayuko Kamiyanagi, Takafumi Otomaru, Ayako Kanazaki, Mihoko Haraguchi, Mai Murase, Noriko Hatano, Hisashi Taniguchi
PURPOSE: The purpose of this survey was to examine the overview of maxillofacial prosthetic treatment at our department, in order to ascertain the actual status of patients and discuss future needs. METHODS: Subjects were all patients who visited Clinic for Maxillofacial Prosthetics, Dental Hospital, Tokyo Medical and Dental University (TMDU) in the period from January 1, 1980 to December 31, 2014. Using medical records of the Clinic for Maxillofacial Prosthetics, Dental Hospital, TMDU, patients' data including sex, address, referring institution, and primary condition were analyzed throughout the period...
January 29, 2018: Journal of Prosthodontic Research
Asako Suzuki, Masayasu Ito, Yasuhiko Kawai
PURPOSE: Tongue movement with unstable swallowing cause artifacts on magnetic resonance imaging (MRI). This may be associated with loss of occlusal support. This study aimed to clarify whether motion artifacts can be mitigated by denture wearing during MRI examination in patients without occlusal support, and whether denture wearing affect tongue stability, form, and position were also evaluated. METHODS: Ten subjects without occlusal support (6 male, 4 female; mean age 73...
January 17, 2018: Journal of Prosthodontic Research
Tim Joda, Benjamin Voumard, Philippe K Zysset, Urs Brägger, Marco Ferrari
PURPOSE: The aims were to analyze stiffness, ultimate force, and failure modes of a 2-piece zirconium dioxide (ZrO2) implant system. METHODS: Eleven 2-piece ZrO2 implants, each mounted with ZrO2 abutments plus bonded monolithic lithium disilicate (LS2) restorations, were grouped for 3.3mm (A) and 4.1mm (B) diameter samples. Quasi-static load was monotonically applied under a standardized test set-up (loading configuration according to DIN ISO 14801). The ultimate force was defined as the maximum force that implants are able to carry out until fracture; stiffness was measured as the maximum slope during loading...
December 14, 2017: Journal of Prosthodontic Research
Takashi Tsutsumi, Hiroshi Kajiya, Takashi Tsuzuki, Kazuko T Goto, Koji Okabe, Yutaka Takahashi
PURPOSE: Occlusal trauma, resulting in the destruction of alveolar bone, is a form of periodontal disease caused by excessive mechanical stress (MS) during hyperocclusion. Previously, we showed that CC chemokine ligand (CCL) 2/CCR2 receptor axis plays a crucial role in MS-dependent osteoclastogenesis. However, in the previous work, we were unable to precisely measure changes in alveolar bone profiles. In the present study, we sought to establish a precise method for evaluating alveolar bone resorption induced by hyperocclusion using micro-computed tomography...
December 11, 2017: Journal of Prosthodontic Research
Doaa Taha, Sebastian Spintzyk, Christine Schille, Ahmed Sabet, Marwa Wahsh, Tarek Salah, Jürgen Geis-Gerstorfer
PURPOSE: The purpose of this in vitro study was to assess the effect of varying the margin designs and the occlusal thicknesses on the fracture resistance and mode of failures of endodontically treated teeth restored with polymer infiltrated ceramic endocrown restorations. METHODS: Root canal treated mandibular molars were divided into four groups (n=8) and were prepared to receive Computer-Aided Design/Computer-Aided Manufacturing (CAD/CAM) fabricated polymer infiltrated ceramic endocrowns (ENAMIC blocks)...
December 11, 2017: Journal of Prosthodontic Research
Alfredo Passaretti, Giulia Petroni, Giovanna Miracolo, Valeria Savoia, Angelo Perpetuini, Andrea Cicconetti
PURPOSE: The goal of this work is to describe an implant-prosthetic protocol for rehabilitation of edentulous mandible, by using a fixed prosthesis made of fiber-reinforced composite material (FRC). The protocol contemplates a minimal invasive surgery and ensures predictable and safe results, with good aesthetic and performance combined to cost savings. METHODS: FRC material is used to build the substructure of a prosthetic framework supported by four short implants (5mm long and 4mm wide)...
December 6, 2017: Journal of Prosthodontic Research
Verena Preis, Sebastian Hahnel, Michael Behr, Martin Rosentritt
PURPOSE: High wear resistance of denture teeth preserves good occlusal relationship and sufficient parafunctional stability. This in-vitro investigation aimed to determine and compare the wear performance of different artificial denture teeth. METHODS: Denture teeth of fifteen commercial products (n=8/group) were loaded in a pin-on-block design using steatite antagonists (d=3mm). Cyclic loading (50 N) was applied for 120,000 loadings (f=1.2Hz) with simultaneous thermal cycling (distilled water, 5°C/55°C, 2min/cycle)...
December 4, 2017: Journal of Prosthodontic Research
Alexander Schmidt, Teresa Häussling, Peter Rehmann, Heidrun Schaaf, Bernd Wöstmann
PURPOSE: An accurate impression is required for implant treatment. The aim of this in-vitro study was to determine the effect size of the impression material/method, implant system and implant angulation on impression transfer precision. METHODS: An upper jaw model with three BEGO and three Straumann implants (angulations 0°, 15°, 20°) in the left and right maxilla was used as a reference model. One polyether (Impregum Penta) and two polyvinyl siloxanes (Flexitime Monophase/Aquasil Ultra Monophase) were examined with two impression techniques (open and closed tray)...
November 27, 2017: Journal of Prosthodontic Research
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