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Journal of Prosthodontic Research

Atais Bacchi, Samara Boccardi, Rodrigo Alessandretti, Gabriel Kalil Rocha Pereira
PURPOSE: To evaluate the substrate masking ability of different ceramic systems used for complete crowns and assess the influence of their association with an opaque resin-based luting agent (OLA). METHODS: Eleven ceramic groups were tested (n=10). Bilayer groups were: ZrPc - zirconia+porcelain; CAD-onHT - zirconia+high translucent lithium disilitace; CAD-onLT - zirconia+low translucent lithium disilicate; LDPc - high opaque lithium disilicate+porcelain. Monolithic groups were: TZ - high translucent zirconia; TLS - translucent, zirconia-reinforced lithium silicate; HTLS - high translucent, zirconia-reinforced lithium silicate; LTLD - low translucent lithium disilicate; HTLD - high translucent lithium disilitace; LGC - leucite-reinforced glass ceramic; FC - feldsphatic ceramic...
February 9, 2019: Journal of Prosthodontic Research
Suguru Kimoto, Nobuhiko Furuse, Takahiro Ogawa, Yoshio Nakashima, So Furokawa, Masakazu Okubo, Hidenori Yamaguchi, Yasuhiko Kawai
PURPOSE: This study aimed to investigate whether the mandible is more receptive to external stimuli than the maxilla in patients with complete dentures by comparing regional current perception thresholds (CPTs) and pain threshold (PTs). METHODS: A single operator obtained measurements from maxillae at the incisor foramen and the left side of the greater palatine foramen region and the mandible at the left side of the mental foramen region, using the Neurometer CPT/C device, CPT and PT values from the oral mucosa of 20 edentulous individuals wearing complete dentures were analyzed...
February 9, 2019: Journal of Prosthodontic Research
Masae Kitagawa, Satoshi Murakami, Yoshihiko Akashi, Hiroko Oka, Tomoaki Shintani, Ikuko Ogawa, Takashi Inoue, Hidemi Kurihara
PURPOSE: To assess the current status of patients with dental metal allergies in Japan. METHODS: This study analyzed dental metal allergy in 1225 patients (1:3 male to female ratio; average age 53.0 ±16.5 years), including 300 who were scheduled to undergo dental implant surgery, between 2006 and 2016. For diagnosis of metal allergy, patch tests using metal allergens were performed. Additionally, when necessary, metal element analysis of dental alloys was performed in the mouths of some patients using an X-ray fluorescence analyzer for those who exhibited positive reactions...
February 6, 2019: Journal of Prosthodontic Research
Kamolporn Wattanasirmkit, Taksid Charasseangpaisarn
PURPOSE: This study was observed the effect of cleansing agents and adhesive resins on shear bond strength (SBS), surface morphology and phase transformation of saliva and silicone disclosing medium contaminated zirconia. METHODS: The 110 zirconia specimens size 5×5×1mm were fabricated and randomly divided into 5 surface treated groups: Non-contaminated (PC) Saliva and silicone disclosing medium contaminated without cleansing (NC) Surface contaminated and cleansing with Phosphoric acid (PO) Ivoclean (IC) or Hydrofluoric acid (HF)...
January 28, 2019: Journal of Prosthodontic Research
Toshiki Yamazaki, Natsuko Murakami, Shizuka Suzuki, Kazuyuki Handa, Masaru Yatabe, Hidekazu Takahashi, Noriyuki Wakabayashi
PURPOSE: The purpose of this study was to determine the effect of block-out preparation, used to eliminate the undercut area, on the retentive force and stress distribution of resin clasps. METHODS: A total of 72 polyester and polyamide resin clasps were fabricated on a premolar abutment crown following six block-out preparations. A combination of two types of vertical block-outs and three types of horizontal block-outs (on the missing side) was used on the abutment tooth...
January 28, 2019: Journal of Prosthodontic Research
Mai Ikuta, Takashi Iida, Mohit Kothari, Akiko Shimada, Osamu Komiyama, Peter Svensson
PURPOSE: To investigate if sleep bruxism (SB) influences training-induced cortical plasticity and performance in terms of accuracy and precision of a tooth-clenching task (TCT). METHODS: Thirty-eight participants were allocated into SB group (N=19) and control group (N=19) according to presence of SB based on a 2-week screening. The participants were instructed to perform a standardized TCT for 58min at three different force levels (10%, 20% and 40% of maximum voluntary contraction; MVC) in three series (first and third without visual-feedback and second with visual-feedback)...
January 28, 2019: Journal of Prosthodontic Research
Atsuko Kuramochi, Hiroshi Shiga
PURPOSE: To clarify the effect of denture treatment on masticatory movement in patients with complete dentures. METHODS: Forty eight patients who required new complete dentures and 20 patients who were satisfied with their original complete dentures (control: C group) participated in this study. Subjects were asked to chew a gummy jelly on their habitual chewing side. The movement of mandibular incisal point was recorded using a mandibular kinesiograph. First, average path and overlap of the movement path were displayed for the ten cycles between the fifth cycle and the fourteenth cycle...
January 25, 2019: Journal of Prosthodontic Research
Yuka Yasui, Junko Tanaka, Masaki Kakudo, Masahiro Tanaka
PURPOSE: The relation between preference and the gaze for the test foods under unconsciousness using the eye-tracking system was investigated. METHODS: Participants consisted of 37 healthy volunteers. Test foods were steamed rice 150g, grilled salmon approximately 45g and slice cooked squash 60g, all of which were served on a tray. Foods forms were regular food, chopped food, and blended food. After attached to the eye tracker, participants watched the each dish arranged in front of them freely for 10s...
January 25, 2019: Journal of Prosthodontic Research
Akimasa Kurozumi, Tetsuya Hara, Shunichi Sakamoto, Daisuke Araki, Sachiyo Iida-Tamada, Chisa Kuroda-Ishimine, Shogo Minagi
PURPOSE: Animal experiments have shown that the loss of occlusal support causes impairments in spatial cognition. Many reports have focused on the memory encoding process, and only few studies have investigated the effect on memory retrieval. This study aimed to examine the effects of both the loss and reconstruction of occlusal support on the memory retrieval process and on the number of hippocampal pyramidal cells. METHODS: The experimental animals were divided into a molarless group, in which molars were extracted, a denture-wearing molarless group with experimental dentures inserted after molar extraction, and a control group...
January 25, 2019: Journal of Prosthodontic Research
Junji Iwata, Masaki Asakura, Tatsuhide Hayashi, Shozo Tsuruta, Miki Hori, Yoshinori Nagase, Akimichi Mieki, Seiji Ban, Tatsushi Kawai
PURPOSE: Immersion tests in purified water were conducted to evaluate the leaching behaviors of filler elements contained in computer-aided design/computer-aided manufacturing (CAD/CAM) composite resin. METHODS: Four commercial CAD/CAM resin composite blanks were tested: Shofu block HC 2 layer, Cerasmart, Katana Avencia block, and KZR-CAD HR Block 2. The specimens in the size of 10.0×12.0×2.0mm were immersed in a 50-mL conical tube containing 40mL of purified water, and then placed in a constant-temperature oven set at a temperature of 37, 60, 70, or 80°C and stored statically for 30 days...
January 21, 2019: Journal of Prosthodontic Research
Hiroyuki Suzuki, Manabu Kanazawa, Yuriko Komagamine, Maiko Iwaki, Noriko Amagai, Shunsuke Minakuchi
PURPOSE: Providing appropriate dental prostheses and dietary interventions may improve food and nutrient intake in elderly edentulous patients, but evidence to support their use is scarce. In this trial, we aimed to clarify the combined effect, on the nutritional statuses of edentulous elderly patients, of dentists providing complete dentures with dietary advice. METHODS: A randomized-controlled trial was performed on a healthy elderly population who required new complete dentures...
January 15, 2019: Journal of Prosthodontic Research
Yumi Tsuchida, Hidekazu Takahashi, Hiroshi Watanabe, Meiko Oki, Maho Shiozawa, Tohru Kurabayashi, Tetsuya Suzuki
PURPOSE: Computed tomography (CT) imaging for three-dimensional (3D) printed models may improve the quality of surgical preoperative plans. Although metal objects can cause artifacts in CT images, integration of CT and digital dental arch imaging may solve this problem. The present study aimed to evaluate effects of the number of metal restorations and mandibular position during CT imaging on accuracy of reproduced models. METHODS: Stereolithography datasets from three sets of dental models having different numbers of metal restorations were obtained using a laboratory digitizing device (control) and CT equipment (nonintegrated data)...
January 15, 2019: Journal of Prosthodontic Research
Daisuke Teshigawara, Teruo Ino, Hidetoshi Otsuka, Tomonori Isogai, Masanori Fujisawa
PURPOSE: Clinical failures of teeth restored with post-and-core are critical issues for the survival of teeth and maintenance of oral functions. A tooth with post-and-core restoration is a complex structure. Cement adhesion is believed to be the weakest component, and breakage in this component leads to changes in stress distribution in the complex structure. The tested hypothesis was that cement breaking processes of prosthetic treated teeth were affected by elastic properties of post-and-cores...
January 13, 2019: Journal of Prosthodontic Research
Youssef S Al Jabbari, Xanthippi Barmpagadaki, Ilias Psarris, Spiros Zinelis
PURPOSE: To perform a comparative analysis of the microstructure, porosity, mechanical properties, corrosion, and tarnish resistance of Co-Cr alloys prepared by casting and three different computer aided designed/computer aided manufacturing (CAD/CAM) techniques. METHODS: Four groups of metallic specimens were prepared, one each by conventional casting (CST), milling (MIL), selective laser melting (SLM), and milling soft metal (MSM). Ten samples were tested by X-rays, after which their microstructure and elemental composition were tested by scanning electron microscopy/energy dispersive X-ray spectroscopy (SEM/EDX) analysis...
January 11, 2019: Journal of Prosthodontic Research
Akiko Komine, Ryo Ishida, Shuichiro Yamashita
PURPOSE: The purpose of this study was to examine the hypothesis that in the process from food ingestion to swallowing, intentional decrease in the muscle activity during mastication would affect the number of chewing strokes, and thus the occurrence of Stage II transport (St2Tr) or the number of swallowing. METHODS: Twenty adults with healthy dentition were instructed to make (1) normal mastication and (2) mastication with 50% muscle activity (50% mastication), controlled by visual feedback with electromyogram...
January 11, 2019: Journal of Prosthodontic Research
Tomoaki Mameno, Masahiro Wada, Yoshinobu Onodera, Daiju Fujita, Hironobu Sato, Kazunori Ikebe
PURPOSE: The purpose of this study was to evaluate the incidence of peri-implantitis and to identify potential associated risk indicators. METHODS: This longitudinal study included 477 patients treated with 1420 implants. Medical and dental histories were evaluated in all patients. The location, size, connection type, surgical protocol, use of prosthesis splinting and fixation type were evaluated for each implant. In peri-implant evaluation, minimum keratinized tissue width around implants, peri-implant probing depths, peri-implant bleeding and peri-implant suppuration were assessed...
December 29, 2018: Journal of Prosthodontic Research
Rafael Rocha Pacheco, Adriana Oliveira Carvalho, Carolina Bosso André, Ana Paula Almeida Ayres, Renata Bacelar Catanhede de Sá, Tiago Monteiro Dias, Frederick Allen Rueggeberg, Marcelo Giannini
PURPOSE: The aim of this study was to evaluate the influence of indirect restorative material type and thickness on the transmission of different wavelengths from a broad-banded dental curing light. METHODS: Four dental indirect restorative materials for computer-aided design and computer-aided manufacturing (CAD/CAM) were evaluated: [RC] resin/ceramic hybrid material (Lava Ultimate), [FC] feldspathic ceramic (VitaBlocs), and two zirconia-based ceramics ([ZK] Katana; and [ZL] Lava)...
December 28, 2018: Journal of Prosthodontic Research
Akinori Tasaka, Satoru Matsunaga, Kento Odaka, Ken Ishizaki, Takayuki Ueda, Shinich Abe, Masao Yoshinari, Shuichiro Yamashita, Kaoru Sakurai
PURPOSE: The aim of the present study was to compare the accuracy and retentive force of an experimental denture base fabricated using additive manufacturing and heat curing. METHODS: A maxillary edentulous jaw model made of silicon was used. The shape data for the working cast and wax pattern of the experimental denture base were obtained using a dental laboratory scanner. Fabrication of the experimental denture bases was performed using heat curing and additive manufacturing...
December 21, 2018: Journal of Prosthodontic Research
Shoko Miura, Shin Kasahara, Shinobu Yamauchi, Yusuke Katsuda, Akio Harada, Jun Aida, Hiroshi Egusa
PURPOSE: To evaluate the early performance of computer-aided design/computer-aided manufacturing (CAD/CAM)-produced composite resin crown (CAD/CAM composite crown) treatment on premolars, specifically, placement on a removable partial denture (RPD) abutment tooth, and the distalmost tooth in the dental arch, as possible clinical risk factors. METHODS: A retrospective cohort study (April 2014 to July 2017) was performed utilizing the clinical records of patients who received a premolar CAD/CAM composite crown treatment...
December 21, 2018: Journal of Prosthodontic Research
Shinobu Yamauchi, Shoko Miura, Shin Kasahara, Jirun Sun, Hiroshi Egusa
PURPOSE: To investigate the influence of firing condition and thickness of a yttria-stabilized tetragonal zirconia polycrystal (Y-TZP) frame on the fracture toughness of veneering ceramics. METHODS: Layering and pressable ceramics without frames or on 0.8- and 1.2-mm-thick Y-TZP frames were fired with 5 schedules (normal and 4 customized conditions). The fracture toughness of the ceramics was measured at 0.5-2.5mm from the frame by the indentation fracture method...
December 19, 2018: Journal of Prosthodontic Research
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