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Journal of Prosthodontic Research

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https://www.readbyqxmd.com/read/29759826/framework-design-and-pontics-of-fiber-reinforced-composite-fixed-dental-prostheses-an-overview
#1
REVIEW
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...
May 11, 2018: Journal of Prosthodontic Research
https://www.readbyqxmd.com/read/29731271/effect-of-preparation-design-for-all-ceramic-restoration-on-maxillary-premolar-a-3d-finite-element-study
#2
Ebrahim Maghami, Ehsan Homaei, Khalil Farhangdoost, Edmond Ho Nang Pow, Jukka Pekka Matinlinna, James Kit-Hon Tsoi
PURPOSE: The aim of this study was to investigate and quantify the effect of preparation design parameters on a premolar restored with two different CAD/CAM ceramic crowns by three-dimensional finite element analysis (FEA). METHODS: A restored human first premolar was digitized by a micro-CT scanner and a 3D model was created by a medical image processing software (Mimics). Following segmentation, dentine and ceramic were extracted by a surface meshing software (3-matic)...
May 3, 2018: Journal of Prosthodontic Research
https://www.readbyqxmd.com/read/29706464/factors-related-to-masticatory-performance-in-healthy-elderly-individuals
#3
Koji Morita, Hiroki Tsuka, Kan Kato, Takahiro Mori, Rumi Nishimura, Mitsuyoshi Yoshida, Kazuhiro Tsuga
PURPOSE: Maintenance of natural dentition and/or prosthodontic rehabilitation is necessary for good masticatory function. Although other factors such as physical and oral functions are also important for masticatory performance, only a few studies have evaluated their roles. The aim of the current study was to assess factors associated with masticatory performance among elderly individuals, while maintaining and/or reconstructing all occlusal support areas. METHODS: The present study was designed and implemented as a cross-sectional study, involving a total of 262 participants (mean age: 74...
April 26, 2018: Journal of Prosthodontic Research
https://www.readbyqxmd.com/read/29673741/cross-sectional-observational-study-exploring-clinical-risk-of-titanium-allergy-caused-by-dental-implants
#4
Maki Hosoki, Keisuke Nishigawa, Toyoko Tajima, Mayu Ueda, Yoshizo Matsuka
PURPOSE: Studies have reported cases of metal allergy caused by titanium-containing materials. We wished to clarify the relationship between titanium allergy and dental implants by describing patients who suffered allergic symptoms after they had received such implants. METHODS: A total of 270 patients who visited a Dental Metal Allergy Clinic at Tokushima University Hospital from April 2010 to March 2014 were the study cohort. Patch testing with 28 types of metal allergens (including four titanium allergens) was undertaken for patients...
April 16, 2018: Journal of Prosthodontic Research
https://www.readbyqxmd.com/read/29655527/the-smiling-scan-technique-facially-driven-guided-surgery-and-prosthetics
#5
Alessandro Pozzi, Lorenzo Arcuri, Peter K Moy
PURPOSE: To introduce a proof of concept technique and new integrated workflow to optimize the functional and esthetic outcome of the implant-supported restorations by means of a 3-dimensional (3D) facially-driven, digital assisted treatment plan. METHODS: The Smiling Scan technique permits the creation of a virtual dental patient (VDP) showing a broad smile under static conditions. The patient is exposed to a cone beam computed tomography scan (CBCT), displaying a broad smile for the duration of the examination...
April 11, 2018: Journal of Prosthodontic Research
https://www.readbyqxmd.com/read/29636243/surface-morphology-of-silicone-soft-relining-material-after-mechanical-and-chemical-cleaning
#6
Takayuki Ueda, Keitaro Kubo, Takeshi Saito, Tomokuni Obata, Takeshi Wada, Koichiro Yanagisawa, Kaoru Sakurai
PURPOSE: The objective was to investigate the influence of chemical and mechanical cleaning on the surface morphology of a silicone soft relining material. METHODS: Three plate-shaped specimens were prepared for each group (Control, Hard and Soft) by laminating a 1.5-mm-thick silicone soft relining material. The Control group specimens were stored in water, and the Hard and Soft group specimens were cleaned with hard and soft bristle denture brushes, respectively...
April 7, 2018: Journal of Prosthodontic Research
https://www.readbyqxmd.com/read/29636242/influence-of-additional-reinforcement-of-fixed-long-term-temporary-restorations-on-fracture-load
#7
Katharina Debye, Taskin Tuna, Shaza Bishti, Stefan Wolfart
PURPOSE: In implant dentistry, temporary restorations (TR) might often be required for up to one year. The aim of this in vitro study was to evaluate the long-time performance of four-unit TRs in the posterior region based on different materials and reinforcement methods. METHODS: One hundred and forty four TRs were manufactured on 16 models simulating an oral situation of two missing posterior teeth. With a computer-aided-design/computer-aided-manufacturing (CAD/CAM) workflow, a TR was fabricated (CAD; Telio CAD), which served as a template for other subgroups...
April 7, 2018: Journal of Prosthodontic Research
https://www.readbyqxmd.com/read/29615324/comparing-the-accuracy-trueness-and-precision-of-models-of-fixed-dental-prostheses-fabricated-by-digital-and-conventional-workflows
#8
Ji-Young Sim, Yeon Jang, Woong-Chul Kim, Hae-Young Kim, Dong-Hwan Lee, Ji-Hwan Kim
PURPOSE: This study aimed to evaluate and compare the accuracy. METHODS: A reference model was prepared with three prepared teeth for three types of restorations: single crown, 3-unit bridge, and inlay. Stone models were fabricated from conventional impressions. Digital impressions of the reference model were created using an intraoral scanner (digital models). Physical models were fabricated using a three-dimensional (3D) printer. Reference, stone, and 3D printed models were subsequently scanned using an industrial optical scanner; files were exported in a stereolithography file format...
March 31, 2018: Journal of Prosthodontic Research
https://www.readbyqxmd.com/read/29605190/fracture-strength-testing-of-crowns-made-of-cad-cam-composite-resins
#9
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...
March 28, 2018: Journal of Prosthodontic Research
https://www.readbyqxmd.com/read/29555174/digital-impression-and-jaw-relation-record-for-the-fabrication-of-cad-cam-custom-tray
#10
Manabu Kanazawa, Maiko Iwaki, Toshio Arakida, Shunsuke Minakuchi
PURPOSE: This article describes the protocol of a digital impression technique to make an impression and recording of the jaw relationship of edentulous patients for the fabrication of CAD/CAM custom tray using computer-aided design and manufacturing (CAD/CAM) technology. METHODS: Scan the maxillary and mandibular edentulous jaws using an intraoral scanner. Scan the silicone jig with the maxillary and mandibular jaws while keeping the jig between the jaws. Import the standard tessellation language data of the maxillary and mandibular jaws and jig to make a jaw relation record and fabricate custom trays (CAD/CAM trays) using a rapid prototyping system...
March 16, 2018: Journal of Prosthodontic Research
https://www.readbyqxmd.com/read/29548978/masticatory-performance-and-oral-health-related-quality-of-life-before-and-after-complete-denture-treatment
#11
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...
March 13, 2018: Journal of Prosthodontic Research
https://www.readbyqxmd.com/read/29530411/masticatory-performance-of-the-elderly-as-seen-from-differences-in-occlusal-support-of-residual-teeth
#12
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
https://www.readbyqxmd.com/read/29526509/availability-of-cosmetic-treatment-using-novel-cosmetics-based-material-on-patients-with-craniofacial-concavity
#13
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
https://www.readbyqxmd.com/read/29526508/risk-factors-associated-with-post-loading-implant-loss-of-removable-and-fixed-implant-supported-prostheses-in-edentulous-jaws
#14
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
https://www.readbyqxmd.com/read/29502933/trueness-and-precision-of-digital-impressions-obtained-using-an-intraoral-scanner-with-different-head-size-in-the-partially-edentulous-mandible
#15
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
https://www.readbyqxmd.com/read/29475807/the-occurrence-of-respiratory-events-in-young-subjects-with-a-frequent-rhythmic-masticatory-muscle-activity-a-pilot-study
#16
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 21, 2018: Journal of Prosthodontic Research
https://www.readbyqxmd.com/read/29475809/glass-fiber-reinforced-thermoplastics-for-use-in-metal-free-removable-partial-dentures-combined-effects-of-fiber-loading-and-pigmentation-on-color-differences-and-flexural-properties
#17
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
https://www.readbyqxmd.com/read/29475808/effects-of-tooth-loss-on-brain-structure-a-voxel-based-morphometry-study
#18
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
https://www.readbyqxmd.com/read/28935192/effect-of-priming-agents-on-shear-bond-strengths-of-resin-based-luting-agents-to-a-translucent-zirconia-material
#19
Shogo Yagawa, Futoshi Komine, Ryosuke Fushiki, Kei Kubochi, Fumiaki Kimura, Hideo Matsumura
PURPOSE: The purpose of the present study was to evaluate the effect of priming agents and artificial aging with thermocycling on shear bond strengths of two resin-based luting agents to a translucent zirconia material. METHODS: A total of 308 pairs of translucent zirconia disk specimens were divided into seven treatment groups: Alloy Primer (ALP), Clearfil Ceramic Primer Plus (CCP), Meta Fast Bonding Liner (MFB), MR. bond (MRB), Super-Bond PZ Primer Liquid B (PZB), V-Primer (VPR), and an unprimed group (UP)...
April 2018: Journal of Prosthodontic Research
https://www.readbyqxmd.com/read/29428170/fitness-and-retentive-force-of-cobalt-chromium-alloy-clasps-fabricated-with-repeated-laser-sintering-and-milling
#20
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
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