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International Journal of Prosthodontics

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https://www.readbyqxmd.com/read/29145529/volumetric-bone-measurement-around-dental-implants-using-3d-image-superimposition-a-methodological-and-clinical-pilot-study
#1
Eduardo Aydos Villarinho, André Correia, Alvaro Vigo, Nuno Viriato Ramos, Mário Augusto Pires Vaz, Rosemary Sadami Arai Shinkai
PURPOSE: This study describes the development of a methodology for using three-dimensional (3D) image superimposition to measure volumetric changes in bone level around dental implants in comparison with linear measures. MATERIALS AND METHODS: The sample was comprised of 46 dental implants of 6-mm length and 4.1-mm diameter placed in the posterior maxilla and posterior mandible in 20 patients. All implants received screw-retained single crowns. Radiographic images were taken using cone beam computed tomography (CBCT) and digital periapical radiography after implantation and after 12 and 24 months of functional loading (after crown installation)...
November 16, 2017: International Journal of Prosthodontics
https://www.readbyqxmd.com/read/29145528/auricular-prostheses-produced-by-means-of-conventional-and-digital-workflows-a-clinical-report-on-esthetic-outcomes
#2
Alexey Unkovskiy, Joern Brom, Fabian Huettig, Constanze Keutel
The utilization of additive manufacturing (AM) technology for the production of auricular prostheses has been widely acknowledged. However, few studies and case history reports have evaluated the esthetic outcomes of AM prostheses compared to those of conventionally manufactured prostheses. In this case history report, three manufacturing approaches-conventional, indirect, and direct mold preparation-were assessed for their esthetic outcomes in the same patient.
November 16, 2017: International Journal of Prosthodontics
https://www.readbyqxmd.com/read/29145527/evaluation-of-operating-time-and-patient-perception-using-conventional-impression-taking-and-intraoral-scanning-for-crown-manufacture-a-split-mouth-randomized-clinical-study
#3
Yasser Haddadi, Golnosh Bahrami, Flemming Isidor
PURPOSE: To compare operating time and patient perception of conventional impression (CI) taking and intraoral scanning (IOS) for manufacture of a tooth-supported crown. MATERIALS AND METHODS: A total of 19 patients needing indirect full-coverage restorations fitting the requirements for a split-mouth design were recruited. Each patient received two lithium disilicate crowns, one manufactured from CI taking and one from IOS. Both teeth were prepared following the manufacturers' recommendations...
November 16, 2017: International Journal of Prosthodontics
https://www.readbyqxmd.com/read/29145526/factors-affecting-the-decision-to-use-cemented-or-screw-retained-fixed-implant-supported-prostheses-a-critical-review
#4
Miguel Gómez-Polo, Rocio Ortega, Cristina Gómez-Polo, Alicia Celemin, Jaime Del Rio Highsmith
PURPOSE: This review aimed to compile and enumerate all the factors described in the literature that may affect the decision to use either cemented or screw-retained restorations and to determine the relative weights of each factor by type of retention and prosthesis. MATERIALS AND METHODS: The literature was reviewed, and the factors were classified as either determining (present in a clinical situation in which one of the retention mechanisms was clearly more suitable than the other) or conditioning (present in clinical situations in which one type of restoration was not clearly more advantageous than the other)...
November 16, 2017: International Journal of Prosthodontics
https://www.readbyqxmd.com/read/29145525/association-between-missing-posterior-teeth-and-occurrence-of-temporomandibular-joint-condylar-erosion-a-cone-beam-computed-tomography-study
#5
Felix Bertram, Linus Hupp, Dagmar Schnabl, Ansgar Rudisch, Rüdiger Emshoff
PURPOSE: To determine a possible association between asymptomatic temporomandibular joint (TMJ) condylar erosion and the number of missing posterior teeth and their location, as well as the number of dental quadrants with missing posterior teeth. MATERIALS AND METHODS: This case-control study involved 210 patients (male to female ratio = 98:112) aged 16-74 years, with 105 asymptomatic patients with TMJ condylar erosion and a control group of 105 patients without TMJ condylar erosion...
November 16, 2017: International Journal of Prosthodontics
https://www.readbyqxmd.com/read/29095963/comparative-evaluation-of-a-four-implant-supported-polyetherketoneketone-framework-prosthesis-a-three-dimensional-finite-element-analysis-based-on-cone-beam-computed-tomography-and-computer-aided-design
#6
Ki-Sun Lee, Sang-Wan Shin, Sang-Pyo Lee, Jong-Eun Kim, Jee-Hwan Kim, Jeong-Yol Lee
PURPOSE: The purpose of this pilot study was to evaluate and compare polyetherketoneketone (PEKK) with different framework materials for implant-supported prostheses by means of a three-dimensional finite element analysis (3D-FEA) based on cone beam computed tomography (CBCT) and computer-aided design (CAD) data. MATERIALS AND METHODS: A geometric model that consisted of four maxillary implants supporting a prosthesis framework was constructed from CBCT and CAD data of a treated patient...
November 2017: International Journal of Prosthodontics
https://www.readbyqxmd.com/read/29095962/preload-coefficient-of-friction-and-thread-friction-in-an-implant-abutment-screw-complex
#7
Stefan Wentaschek, Sven Tomalla, Irene Schmidtmann, Karl Martin Lehmann
PURPOSE: To examine the screw preload, coefficient of friction (COF), and tightening torque needed to overcome the thread friction of an implant-abutment-screw complex. MATERIALS AND METHODS: In a customized load frame, 25 new implant-abutment-screw complexes including uncoated titanium alloy screws were torqued and untorqued 10 times each, applying 25 Ncm. RESULTS: Mean preload values decreased significantly from 209.8 N to 129.5 N according to the number of repetitions...
November 2017: International Journal of Prosthodontics
https://www.readbyqxmd.com/read/29084305/influence-of-attachment-height-and-shape-on-lateral-force-transmission-in-implant-overdenture-treatment
#8
Ziwei Ying, Tomoya Gonda, Yoshinobu Maeda
PURPOSE: The purpose of this preliminary study was to examine the influence of overdenture attachment height and shape on lateral force on implants and denture displacement. MATERIALS AND METHODS: A straight model was fabricated to simulate the edentulous ridge. Two strain gauges were attached to the mesial and distal surfaces of the implant in the canine area. Five types of ball attachments and three types of Locator attachments with three types of replacement male attachments were used...
November 2017: International Journal of Prosthodontics
https://www.readbyqxmd.com/read/29084304/surface-roughness-changes-in-denture-liners-in-denture-stomatitis-patients
#9
Fernanda Valentini, Murilo Souza Luz, Noéli Boscato, Tatiana Pereira-Cenci
PURPOSE: This randomized clinical trial assessed how surface roughness (Ra) in resilient liners was affected by soft tissue health conditions and time-related aspects in patients with complete dentures. METHODS: Specimens of acrylic resin (control) and denture liners (silicone-based or acrylic resin-based) were inserted into the dentures of patients with and without denture stomatitis (n = 30). Ra was evaluated before denture insertion and after 7, 14, and 21 days of prosthesis wearing...
November 2017: International Journal of Prosthodontics
https://www.readbyqxmd.com/read/29084303/a-numeric-analysis-of-bone-density-in-the-edentulous-interforaminal-region
#10
Patrick Tavitian, Michel Ruquet, Chloe Mensé, Emmanuel Nicolas, Olivier Hue
PURPOSE: The purpose of this study was to assess the density of interforaminal bone using quantitative computed tomography (QCT) in simulated case histories to be prescribed an All-on-Five fixed implant treatment protocol. MATERIALS AND METHODS: QCT scans from 30 edentulous patients (15 men and 15 women; mean age 63.33 ± 9.3 years) were analyzed using the Nobel Clinician software. Densities (in Hounsfield units [HU]) were recorded at the neck, middle part of the body, and apex of the lingual and buccal parts of proposed implant sites...
November 2017: International Journal of Prosthodontics
https://www.readbyqxmd.com/read/29084302/comparison-of-masticatory-and-swallowing-functional-outcomes-in-surgically-and-prosthetically-rehabilitated-maxillectomy-patients
#11
R Sreeraj, Vinod Krishnan, Manju V, Krishnakumar Thankappan
PURPOSE: This study compared masticatory and swallowing functional outcomes in maxillectomy patients who underwent surgical and prosthetic rehabilitation or prosthetic rehabilitation only following surgical resection. MATERIALS AND METHODS: This comparative cross-sectional study involved 20 maxillectomy patients and compared their masticatory and swallowing functions following combined surgical and prosthodontic management vs an exclusively prosthodontic approach...
November 2017: International Journal of Prosthodontics
https://www.readbyqxmd.com/read/29084301/masticatory-performance-and-maximum-bite-and-lip-force-depend-on-the-type-of-prosthesis
#12
Martin Schimmel, Kujtim Memedi, Tatiana Parga, Joannis Katsoulis, Frauke Müller
PURPOSE: The aim of this cross-sectional study was to assess maximum restraining lip force (MLF), maximum voluntary bite force (MBF), and patient-related parameters to evaluate their influence on masticatory function in four groups of participants with different dental states. METHODS: Participants were recruited and assigned to one of four different groups depending on dental status: complete removable dental prostheses (CRDP group); edentulous with two-implant overdentures (IOD group); Kennedy Class I partial removable dental prostheses (PRDP group); or fully dentate (control group)...
November 2017: International Journal of Prosthodontics
https://www.readbyqxmd.com/read/29084300/retention-strength-of-conical-welding-caps-for-fixed-implant-supported-prostheses
#13
Diego Nardi, Marco Degidi, Gianluca Sighinolfi, Florian Tebbel, Claudio Marchetti
PURPOSE: This study evaluated the retention strength of welding caps for Ankylos standard abutments using a pull-out test. MATERIALS AND METHODS: Each sample consisted of an implant abutment and its welding cap. The tests were performed with a Zwick Roell testing machine with a 1-kN load cell. RESULTS: The retention strength of the welding caps increased with higher abutment diameters and higher head heights and was comparable or superior to the values reported in the literature for the temporary cements used in implant dentistry...
November 2017: International Journal of Prosthodontics
https://www.readbyqxmd.com/read/29084299/effects-of-cement-abutment-surface-pretreatment-and-artificial-aging-on-the-force-required-to-detach-cantilever-fixed-dental-prostheses-from-dental-implants
#14
Stefanie Kappel, Taras Chepura, Marc Schmitter, Peter Rammelsberg, Stefan Rues
PURPOSE: To examine the in vitro effects of different cements, abutment surface preconditioning, and artificial aging on the maximum tensile force needed to detach cantilever fixed dental prostheses (FDPs) from dental implants with titanium abutments. MATERIALS AND METHODS: A total of 32 tissue-level implants were combined with standardized titanium abutments. For each test group, eight cantilever FDPs were fabricated using selective laser melting (cobalt-chromium [CoCr] alloy)...
November 2017: International Journal of Prosthodontics
https://www.readbyqxmd.com/read/29084298/a-polymethyl-methacrylate-based-acrylic-dental-resin-surface-bound-with-a-photoreactive-polymer-inhibits-accumulation-of-bacterial-plaque
#15
Miya Fukunishi, Yuuki Inoue, Hirobumi Morisaki, Hirotaka Kuwata, Kazuhiko Ishihara, Kazuyoshi Baba
PURPOSE: The aim of this study was to examine the ability of a poly(2-methacryloyloxyethyl phosphorylcholine-co-n-butylmethacrylate-co-2-methacryloyloxyethyloxy-p-azidobenzoate) (PMBPAz) coating on polymethyl methacrylate (PMMA)-based dental resin to inhibit bacterial plaque formation, as well as the polymer's durability against water soaking and chemical exposure. MATERIALS AND METHODS: Successful application of PMBPAz on PMMA surfaces was confirmed by x-ray photoelectron spectroscopy (XPS) and measuring the static air contact angle in water...
November 2017: International Journal of Prosthodontics
https://www.readbyqxmd.com/read/29084297/chairside-computer-aided-design-computer-aided-manufacture-all-ceramic-crown-and-endocrown-restorations-a-7-year-survival-rate-study
#16
Michel Fages, Jacques Raynal, Paul Tramini, Frédéric Jg Cuisinier, Jean-Cédric Durand
PURPOSE: The objective of the present study was to analyze the clinical outcomes of 447 monoblock ceramic chairside computer-aided design/computer-aided manufacture (CAD/CAM) reconstructions over a 7-year functional period. Of these reconstructions, 212 were peripheral crowns and 235 were endocrowns. MATERIALS AND METHODS: The restorations were placed between 2003 and 2008 in a total of 323 patients. They were created using a chairside CAD/CAM method and the same materials in all cases...
November 2017: International Journal of Prosthodontics
https://www.readbyqxmd.com/read/29084296/a-protocol-for-screw-retrievable-cement-retained-implant-supported-fixed-partial-dentures
#17
Abdulaziz AlHelal, Mathew T Kattadiyil, Bader AlBader, Jefferson L Clark
Longevity of implant-supported fixed partial dentures (ISFPDs) may be associated with multiple clinical complications, irrespective of whether retention is achieved via screws or cement. While use of screws ensures ease of prosthesis retrievability and elimination of the inherently risky cementation process, more mechanical strains are induced in this design. A combined screw-retrievable and cement-retained ISFPD is designed to achieve the best passive fit and strain reduction while allowing complete excess cement removal and maintaining ease of retrievability...
November 2017: International Journal of Prosthodontics
https://www.readbyqxmd.com/read/29084295/two-implant-supported-mandibular-overdentures-do-clinical-denture-quality-and-inter-implant-distance-affect-patient-satisfaction
#18
Sara A Alfadda, Mohammad D Al Amri, Amal Al-Ohali, Arwa Al-Hakami, Noura Al-Madhi
PURPOSE: To investigate the following three null hypotheses in patients rehabilitated with a mandibular overdenture supported by two unsplinted implants: (1) patient satisfaction is not related to the clinical quality of the dentures; (2) inter-implant distance (IID) has no effect on the clinical quality of the dentures; and (3) IID does not influence patient satisfaction. MATERIALS AND METHODS: Forty edentulous patients who were rehabilitated with a two-implant-supported mandibular overdenture participated in the study...
November 2017: International Journal of Prosthodontics
https://www.readbyqxmd.com/read/29084294/computer-aided-design-computer-assisted-manufacture-monolithic-restorations-for-severely-worn-dentition-a-case-history-report
#19
Samir Abou-Ayash, Johannes Boldt, Alexander Vuck
Full-arch rehabilitation of patients with severe tooth wear due to parafunctional behavior is a challenge for dentists and dental technicians, especially when a highly esthetic outcome is desired. A variety of different treatment options and prosthetic materials are available for such a clinical undertaking. The ongoing progress of computer-aided design/computer-assisted manufacture technologies in combination with all-ceramic materials provides a predictable workflow for these complex cases. This case history report describes a comprehensive, step-by-step treatment protocol leading to an optimally predictable treatment outcome for an esthetically compromised patient...
November 2017: International Journal of Prosthodontics
https://www.readbyqxmd.com/read/28859182/evaluation-of-a-new-ultrasonic-insert-for-prosthodontic-preparation
#20
Domenico Baldi, Maria Menini, Jacopo Colombo, Enrico Lertora, Paolo Pera
PURPOSE: This paper describes a new ultrasonic instrument (tipholder DB1 with crown prep tip inserts) designed to optimize prosthodontic margin repositioning and finishing. MATERIALS AND METHODS: The insert movement was assessed, and it was demonstrated that tipholder DB1 provides its inserts with an elliptical-like movement, making the entire insert surface able to cut. Then, 20 extracted teeth were prepared using tipholder DB1, sonic instruments, and traditional drills...
September 2017: International Journal of Prosthodontics
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