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Journal of Prosthodontic Research

Hironobu Nishihara, Mireia Haro Adanez, Wael Att
PURPOSE: This systematic review aimed to provide an overview of zirconia implants as well as regarding the outcome of the implant-restorative complex in preclinical studies. STUDY SELECTION: An electronic search of the literature prior to July 2017 was performed to identify all articles related to preclinical research on zirconia implants. The search was conducted using MEDLINE (National Library of Medicine) and PubMed without restrictions concerning the date of publication...
September 8, 2018: Journal of Prosthodontic Research
Keiichiro Sagawa, Hiroyasu Furuya, Yuki Ohara, Mitsuyoshi Yoshida, Hirohiko Hirano, Katsuya Iijima, Takeshi Kikutani
PURPOSE: The aim of this study was to determine the influences of oral motor function such as tongue function and bite force on masticatory performance in the elderly. METHODS: We randomly selected 245 subjects who has 28 natural teeth among community-dwelling elderly. We evaluated masticatory performance using a gummy jelly, and also measured bite force, tongue muscle force, and the speed of tongue movement. RESULTS: We found that reduced masticatory performance to be associated with decreased the speed of tongue movement and/or tongue muscle force, indicating that reduced oral motor function also influences masticatory performance...
September 6, 2018: Journal of Prosthodontic Research
Tokinori Kato, Tamaki Nakano, Yuya Fujita, Tomoyuki Kobayashi, Hirofumi Yatani
PURPOSE: To prospectively evaluate morphological changes in the horizontal and vertical dimensions of peri-implant tissue at 1-year post-prosthesis implantation. METHODS: Thirty-four patients who had received implants with conical connections in the aesthetic region were included in the follow-up study. Patients had received either traditional delayed implant placement or tissue augmentation with or without immediate implant placement. The horizontal and vertical dimensions of the buccal alveolar bone of the implant and its surrounding soft tissues were then evaluated using cone beam computed tomography...
August 27, 2018: Journal of Prosthodontic Research
Shuhua Wang, Toru Ogawa, Sheng Zheng, Makiko Miyashita, Taichi Tenkumo, Zhiyuan Gu, Wenhai Lian, Keiichi Sasaki
PURPOSE: Low-magnitude, high-frequency (LMHF) loading plays an important role in bone healing. The present study aimed to evaluate the effect of LMHF loading applied directly to titanium dental implants on peri-implant bone healing and implant osseointegration. METHODS: The mandibular premolars and molars were extracted from six male Beagle dogs. Three months post-extraction, each of the six dogs had three titanium implants (Aadva Standard Implant Narrow, Φ3.3×8mm) inserted into the mandibular premolar and molar area (three implants per side)...
August 20, 2018: Journal of Prosthodontic Research
Panagiotis Lagouvardos, Nikolina Spyropoulou, Gregory Polyzois
PURPOSE: This study investigates the perceptibility and acceptability thresholds (PT, AT) of observers for L*, a* and b* facial skin differences, very important for the fabrication of a maxillofacial prosthesis. METHODS: One image (10×13.3cm/300dpi), simulating standard facial skin color, and 27 smaller images (4.9×6.0cm/300dpi), simulating shades with different RGB values from the standard were made, using Adobe-Photoshop CS3. The RGB values, were based on 9 stepped increases in L*, a* and b*...
August 15, 2018: Journal of Prosthodontic Research
Hanako Suenaga, Toru Tamahara, Mina Dodo, Toshimitsu Murakami, Satoshi Sasaki, Kengo Ito, Keiichi Jingu, Takeyoshi Koseki, Keiichi Sasaki
PATIENTS: Seventy-one and 73 years-old males visited a perioperative oral care support center to receive perioperative oral management during tongue cancer (T1 N0 M0 ) treatment. To improve their quality of life (QOL) during brachytherapy while preventing radiation-related complications including osteoradionecrosis due to 198 Au grain brachytherapy, spacers for their maxilla and mandible were designed with consideration of wearing condition at an isolation ward. The spacer was created with unilateral design and with consideration of the tongue mobility during day and night...
August 3, 2018: Journal of Prosthodontic Research
Mariela Machado, Christine Wallace, Bruce Austin, Suhas Deshpande, Agnes Lai, Terry Whittle, Iven Klineberg
PURPOSE: This study has evaluated the pre and post perceptions of patients with ectodermal dysplasia (ED) who have been referred to Westmead Centre for Oral Health for treatment with dental implants. METHODS: Six patients with ED and hypodontia were treated with new maxillary complete dental prostheses or fixed implant prostheses, and a mandibular fixed dental prosthesis with implants. Patient perceptions were recorded with a 10cm visual analogue scale (VAS). All patients were asked to draw a line on the VAS which best described their feelings regarding aesthetics, chewing, diet and speech...
July 24, 2018: Journal of Prosthodontic Research
Yuko Watarai, Fumi Mizuhashi, Toshihide Sato, Kaoru Koide
PURPOSE: A new method inducing the physiologic rest position of the mandible using the lip contact position with the closed mouth have compared with those obtained using conventional methods of placing the mandible in the physiologic rest position. METHODS: The lip contact position with the closed mouth as a method was investigated whether the technique was useful for determining the occlusal vertical dimension. The relationship between the space between the maxillary and mandibular front teeth in the lip contact position with the closed mouth and the areas of the prolabia was also investigated...
July 24, 2018: Journal of Prosthodontic Research
M M M Michelon, A T Posch, H R Sampaio-Filho, E J V Lourenco, D M Telles
PURPOSE: The purpose of this in vitro study was to compare the stability of removable implant-supported maxillary overdentures with fixed complete dentures and conventional dentures. METHODS: Four types of complete dentures were tested: conventional complete dentures; overdentures retained by a male resilient attachment system; overdentures retained by a combination of clip bar and attachment system; and fixed complete dentures. Each group was placed in the posterior and anterior region and the stability was recorded by measuring the vertical displacement of the prosthesis...
July 19, 2018: Journal of Prosthodontic Research
Anna Paula da Rosa Possebon, Raissa Micaella Marcello-Machado, Amália Machado Bielemann, Alessandra Julie Schuster, Luciana de Rezende Pinto, Fernanda Faot
PURPOSE: Evaluate how clinical factors related to conventional complete denture (CCD) wearers, can influence masticatory function (MF) of totally edentulous patients before and after one-year transitioning to implant-retained mandibular overdentures (IMO). METHODS: Forty patients using CCD were rehabilitated with IMO and their MF was evaluated by: (i) ST_X50: theoretical aperture through which 50% of the weight of the particles would pass; (ii) STB: distribution homogeneity of the crushed particles...
July 10, 2018: Journal of Prosthodontic Research
Mario Alovisi, Nicola Scotti, Allegra Comba, Elena Manzon, Elena Farina, Damiano Pasqualini, Riccardo Michelotto Tempesta, Lorenzo Breschi, Milena Cadenaro
PURPOSE: The aim of this in vitro study was to assess conversion degree (DC), micro-hardness (MH) and bond strength of two dual-curing resin cements employed under translucent monolithic zirconia irradiated with different time protocols. METHODS: 84 square shaped samples of 1mm thickness were prepared from high translucency zirconia blocks and divided into two groups (n=24) according to the cement employed: (1) Rely-X Ultimate; (2) Panavia SA. Each group was further divided into 3 subgroups (n=8) according to the irradiation time: (a) no light; (b) 20s; (c) 120s...
July 5, 2018: Journal of Prosthodontic Research
Mireia Haro Adánez, Hironobu Nishihara, Wael Att
PURPOSE: This systematic review evaluates the clinical outcome of zirconia implant-associated survival and success rates, marginal bone loss, and implant-restoration complex integrity. STUDY SELECTION: Using the preferred reporting items for systematic reviews and meta-analysis (PRISMA) guidelines, studies including ≥10 patients restored with zirconia implants supporting single crowns (SCs) or fixed dental prostheses (FDPs) prior to January 2017 were identified...
July 5, 2018: Journal of Prosthodontic Research
Leila Perea-Lowery, Pekka K Vallittu
PURPOSE: Fiber-reinforced composite (FRC) fixed dental prostheses (FDPs) have shown good performance in clinical applications due to their good mechanical properties and minimally invasive approach. However, typical failure patterns of FRC FDPs are often localized at the pontic site. That reflects the structural considerations at the framework and pontic location that need to be examined when creating these kinds of prostheses. STUDY SELECTION: Peer-reviewed articles and other scientific literature were reviewed for providing up-to-date information on how pontics of FRC FDPs can be made...
July 2018: Journal of Prosthodontic Research
Ryota Okada, Masaki Asakura, Akihiro Ando, Hirokazu Kumano, Seiji Ban, Tatsushi Kawai, Jun Takebe
PURPOSE: The purpose of this study was to ascertain whether computer aided design/computer aided manufacturing (CAD/CAM) composite resin crowns have sufficient strength to withstand the bite force of the molar teeth. The null hypothesis was that the fracture strength of CAD/CAM composite resin crowns is lower than the average maximum bite force of the molar tooth. METHODS: The crowns, which shape is the right maxillary first molar, were fabricated using four CAD/CAM blanks made of composite resins (Block HC: HC, KZR-CAD HR: HR, KZR-CAD HR2: HR2, Avencia Block: AVE) and one CAD/CAM blank made of lithium disilicate glass-ceramic (IPS e...
July 2018: Journal of Prosthodontic Research
Saori Yamamoto, Hiroshi Shiga
PURPOSE: To clarify the relationship between masticatory performance and oral health-related quality of life (OHRQoL) before and after complete denture treatment. METHODS: Thirty patients wearing complete dentures were asked to chew a gummy jelly on their habitual chewing side, and the amount of glucose extraction during chewing was measured as the parameter of masticatory performance. Subjects were asked to answer the Oral Health Impact Profile (OHIP-J49) questionnaire, which consists of 49 questions related to oral problems...
July 2018: 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)...
July 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...
July 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...
July 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...
July 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...
July 2018: Journal of Prosthodontic Research
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