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Journal of Prosthodontic Research

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https://www.readbyqxmd.com/read/29249574/ultimate-force-and-stiffness-of-2-piece-zirconium-dioxide-implants-with-screw-retained-monolithic-lithium-disilicate-reconstructions
#1
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
https://www.readbyqxmd.com/read/29241945/micro-computed-tomography-for-evaluating-alveolar-bone-resorption-induced-by-hyperocclusion
#2
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
https://www.readbyqxmd.com/read/29241944/fracture-resistance-and-failure-modes-of-polymer-infiltrated-ceramic-endocrown-restorations-with-variations-in-margin-design-and-occlusal-thickness
#3
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
https://www.readbyqxmd.com/read/29223315/metal-free-full-arch-fixed-prosthesis-for-edentulous-mandible-rehabilitation-on-four-implants
#4
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
https://www.readbyqxmd.com/read/29217274/contact-wear-of-artificial-denture-teeth
#5
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
https://www.readbyqxmd.com/read/29191609/accuracy-of-various-impression-materials-and-methods-for-two-implant-systems-an-effect-size-study
#6
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
https://www.readbyqxmd.com/read/29191608/a-fully-digital-approach-to-replicate-functional-and-aesthetic-parameters-in-implant-supported-full-arch-rehabilitation
#7
Carlo Monaco, Nicola Ragazzini, Lorenzo Scheda, Edoardo Evangelisti
PURPOSE: The aim of this technical procedure was to use a fully digital technique (FDT) for full-arch implant support rehabilitation. The FDT was used to transfer the provisional restoration parameters to definitive restorations using intraoral scanners. METHODS: Three sets of digital impressions were obtained. Through the first set, standard tessellation language 1 (STL1), provisional restorations screwed to implants and the surrounding gingival tissue was captured...
November 27, 2017: Journal of Prosthodontic Research
https://www.readbyqxmd.com/read/29153552/cervical-margin-relocation-in-indirect-adhesive-restorations-a-literature-review
#8
REVIEW
Jelena Juloski, Serhat Köken, Marco Ferrari
PURPOSE: The aim of this review was to summarize the existing scientific literature investigating on cervical margin relocation technique (CMR) performed prior to the adhesive cementation of the indirect restorations. STUDY SELECTION: An electronic search with no date restriction was conducted in the MEDLINE database, accessed through PubMed. The following main keywords were used: "cervical margin relocation", "coronal margin relocation", "deep margin elevation" and "proximal box elevation"...
November 15, 2017: Journal of Prosthodontic Research
https://www.readbyqxmd.com/read/29128350/biomechanical-behavior-of-adhesive-cement-layer-and-periodontal-tissues-on-the-restored-teeth-with-zirconia-rbfdps-using-three-kinds-of-framework-design-3d-fea-study
#9
Ayana Uraba, Reina Nemoto, Kosuke Nozaki, Tasuku Inagaki, Satoshi Omori, Hiroyuki Miura
PURPOSE: To investigate stress and strain concentrations on resin-bonded fixed dental prostheses (RBFDPs) frameworks of different design using finite element analysis. METHODS: A human dry skull was scanned and models were produced using three-dimensional printer. After abutment preparation, three frameworks, including a three-unit RBFDP, and two-unit cantilevered RBFDPs using #21 and #23 for the abutment tooth, were fabricated. Scanned data were subtracted to define boundary of each structure...
November 8, 2017: Journal of Prosthodontic Research
https://www.readbyqxmd.com/read/29126811/properties-of-tonic-episodes-of-masseter-muscle-activity-during-waking-hours-and-sleep-in-subjects-with-and-without-history-of-orofacial-pain
#10
Acing Habibie Mude, Shigehisa Kawakami, Seiya Kato, Shogo Minagi
PURPOSE: To provide a scientific data related to the tonic activity of masseter muscle in subjects with and without history of orofacial pain during their normal daily life. METHODS: Thirty-three subjects were divided into two groups, a pain history group (PHG) and a non-pain history group (non-PHG), based on their responses to the Research Diagnostic Criteria for Temporomandibular Disorders questionnaire. After excluding four subjects with incomplete recordings, full-day masseter muscle surface EMGs of 29 subjects (10 men, 19 women; mean age 24...
November 7, 2017: Journal of Prosthodontic Research
https://www.readbyqxmd.com/read/29126810/sensory-trick-splint-as-a-multimodal-therapy-for-oromandibular-dystonia
#11
Kazuya Yoshida
PURPOSE: Many patients with oromandibular dystonia, which is characterized by involuntary masticatory, lower facial, and/or tongue muscle contractions, experience relief of symptoms through sensory tricks such as eating chewing gum or candy. The aim of this study was to identify the factors influencing the effects of splints in patients with oromandibular dystonia. METHODS: Occlusal splints were inserted in 128 patients (89 women, 39 men) with oromandibular dystonia (102 with jaw closing dystonia, 20 with lingual dystonia, 5 with jaw deviation dystonia, 4 with jaw opening dystonia, 3 with lip dystonia, and 2 with jaw protrusion dystonia)...
November 7, 2017: Journal of Prosthodontic Research
https://www.readbyqxmd.com/read/29032176/three-dimensional-evaluation-of-marginal-and-internal-fit-of-3d-printed-interim-restorations-fabricated-on-different-finish-line-designs
#12
Nawal Alharbi, Saud Alharbi, Vincent M J I Cuijpers, Reham B Osman, Daniel Wismeijer
PurposeTo evaluate the influence of fabrication method and finish line design on marginal and internal fit of full-coverage interim restorations. MethodsFour typodont models of maxillary central-incisor were prepared for full-coverage restorations. Four groups were defined; knife-edge (KE), chamfer (C), rounded-shoulder (RS), rounded-shoulder with bevel (RSB). All preparations were digitally scanned. A total of 80 restorations were fabricated; 20 per group (SLA/3D-printed n=10, milled n=10). All restorations were positioned on the master die and scanned using micro-computed tomography...
October 11, 2017: Journal of Prosthodontic Research
https://www.readbyqxmd.com/read/29032956/evaluation-of-surface-treatments-of-monolithic-zirconia-in-different-sintering-stages
#13
Kamal Ebeid, Sebastian Wille, Tarek Salah, Marwa Wahsh, Maged Zohdy, Matthias Kern
PURPOSE: This study evaluated the effect of surface treatment of zirconia in pre-sintered and post-sintered stages on its surface roughness, phase transformation, and biaxial flexural strength (BFS). METHODS: Zirconia ceramic discs (n=40) having a final dimensions of 12mm diameter and 1.2mm thickness were milled then divided into three main groups according to the type of surface treatment performed (Group 1 (n=16); air-abrasion using Al2O3 particles, Group 2 (n=16); silica coating using Rocatec soft, and Group 3 (n=8); a control group receiving no surface treatment)...
October 9, 2017: 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
#14
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)...
September 18, 2017: Journal of Prosthodontic Research
https://www.readbyqxmd.com/read/28927995/measuring-system-for-an-attitude-angle-of-a-denture-using-an-inertial-measurement-unit
#15
Toshiaki Sekita, Syuhei Takeuchi, Syunsuke Minakuchi
PURPOSE: The aim of this study was to assemble and verify a measuring system for 3-D movements (attitude angle) of the denture during function. METHODS: For the calibration test, the sensor was fixed at the center of the rotary table. Operation and stopping of the rotary table were repeated 8 times, and the direction of rotation was reversed in the middle. The amount of rotation was 1.2 and 2.4°. As a pilot clinical trial, the attitude angles of three upper complete dentures during tapping were measured by this system...
September 15, 2017: Journal of Prosthodontic Research
https://www.readbyqxmd.com/read/28927994/current-bone-substitutes-for-implant-dentistry
#16
REVIEW
Masahiro Yamada, Hiroshi Egusa
PURPOSE: Alveolar ridge augmentation is essential for success in implant therapy and depends on the biological performance of bone graft materials. This literature review aims to comprehensively explain the clinically relevant capabilities and limitations of currently available bone substitutes for bone augmentation in light of biomaterial science. STUDY SELECTION: The biological performance of calcium phosphate-based bone substitutes was categorized according to space-making capability, biocompatibility, bioabsorption, and volume maintenance over time...
September 15, 2017: Journal of Prosthodontic Research
https://www.readbyqxmd.com/read/28916466/a-multi-centered-epidemiological-study-evaluating-the-validity-of-the-treatment-difficulty-indices-developed-by-the-japan-prosthodontic-society
#17
Takuo Kuboki, Tetsuo Ichikawa, Kazuyoshi Baba, Masanori Fujisawa, Hironobu Sato, Hideki Aita, Shigeto Koyama, Masayuki Hideshima, Yuji Sato, Hiroyuki Wake, Aya Kimura-Ono, Kan Nagao, Yorika Kodaira-Ueda, Katsushi Tamaki, Shinsuke Sadamori, Kazuhiro Tsuga, Yasuhiro Nishi, Takashi Sawase, Hisashi Koshino, Shin-Ichi Masumi, Kaoru Sakurai, Kanji Ishibashi, Takashi Ohyama, Yasumasa Akagawa, Toshihiro Hirai, Keiichi Sasaki, Kiyoshi Koyano, Hirofumi Yatani, Hideo Matsumura
PURPOSE: The Japan Prosthodontic Society developed a multi-axis assessment protocol to evaluate the complex variations in patients who need prosthodontic care, and to classify the level of treatment difficulty. A previous report found the protocol to be sufficiently reliable. The purpose of this multi-center cohort study was to evaluate the validity of this multi-axis assessment protocol. METHODS: The treatment difficulty was evaluated using the multi-axis assessment protocol before starting prosthodontic treatment...
September 12, 2017: Journal of Prosthodontic Research
https://www.readbyqxmd.com/read/28916465/corrosive-effects-of-fluoride-on-titanium-under-artificial-biofilm
#18
Azusa Fukushima, Gen Mayanagi, Keiichi Sasaki, Nobuhiro Takahashi
PURPOSE: This study aimed to investigate the effect of sodium fluoride (NaF) on titanium corrosion using a biofilm model, taking environmental pH into account. METHODS: Streptococcus mutans cells were used as the artificial biofilm, and pH at the bacteria-titanium interface was monitored after the addition of 1% glucose with NaF (0, 225 or 900ppmF) at 37°C for 90min. In an immersion test, the titanium samples were immersed in the NaF solution (0, 225 or 900ppm F; pH 4...
September 12, 2017: Journal of Prosthodontic Research
https://www.readbyqxmd.com/read/28916464/adhesion-procedure-for-cad-cam-resin-crown-bonding-reduction-of-bond-strengths-due-to-artificial-saliva-contamination
#19
Asuka Kawaguchi-Uemura, Atsushi Mine, Mariko Matsumoto, Yuko Tajiri, Mami Higashi, Tomoshige Kabetani, Ryosuke Hagino, Dai Imai, Takuya Minamino, Jiro Miura, Hirofumi Yatani
PURPOSE: The present study aimed to elucidate how saliva contamination affects microtensile bond strength of resin cement to CAD/CAM resin blocks and identify a decontamination method that can restore original bond strength. METHODS: The KATANA AVENCIA block (Kuraray Noritake Dental) was sandblasted on the adherend surface (P-Co group). Then, the block was contaminated with artificial saliva (Saliveht Aerosol, Teijin). Air dry (N-Co), sandblasting (Sb) and phosphate acid cleaning (AT) groups were prepared...
September 12, 2017: Journal of Prosthodontic Research
https://www.readbyqxmd.com/read/28888428/displacement-comparison-of-cad-cam-titanium-and-zirconia-abutments-to-implants-with-different-conical-connections
#20
Burak Yilmaz, Shervin Hashemzadeh, Jeremy D Seidt, Nancy L Clelland
PURPOSE: To compare the displacements of CAD-CAM zirconia and titanium abutments into different internal connection systems after torquing. METHODS: OsseoSpeed EV and OsseoSpeed TX implants (n=10) were placed in resin blocks. Zirconia and titanium abutments (n=5) were first hand tightened and then tightened to the recommended torque (20Ncm for TX and 25Ncm for EV). Displacements of abutments between screw tightening by hand and torque driver was measured using three-dimensional digital image correlation (3D DIC) technique...
September 6, 2017: Journal of Prosthodontic Research
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