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Journal of Prosthodontics: Official Journal of the American College of Prosthodontists

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https://www.readbyqxmd.com/read/30638286/color-stability-of-cad-cam-ceramics-prepared-with-different-surface-finishing-procedures
#1
Burcu Kanat-Ertürk
PURPOSE: To investigate the color stability of zirconia-reinforced lithium silicate glass-ceramic and lithium disilicate reinforced glass-ceramic, which were prepared with various surface finishing procedures, following 1-week, 2-weeks, 1-month, and 2-months storage in various beverages, and after the application of polishing paste. MATERIALS AND METHODS: Lithium disilicate glass-ceramic (IPS e.max CAD HT) and zirconia-reinforced lithium silicate ceramic (Vita Suprinity HT) CAD/CAM blocks were sectioned with a diamond saw (Metkon) under water cooling into 1...
January 14, 2019: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/30637856/effect-of-thermocycling-on-flexural-properties-of-microcrystalline-cellulose-reinforced-denture-base-acrylic-resins
#2
Amira Ali Abdel Rahaman Ali, Jacob John, Shani Ann Mani, Hesham R El-Seedi
PURPOSE: To assess the impact of thermocycling on flexural properties of denture base acrylic resin reinforced with microcrystalline cellulose (MCC) derived from oil palm empty fruit bunch (OPEFB). MATERIALS AND METHODS: The flexural strength and flexural modulus, following thermocycling (5000 cycles of 5 to 55°C) of 3 MCC-reinforced poly methyl methacrylate (PMMA) specimens were compared with the conventional and commercially available high-impact PMMA. The 3 test groups were represented by addition of various weight combinations of MCC and acrylic powders...
January 14, 2019: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/30637850/relationship-between-selective-serotonin-reuptake-inhibitors-and-risk-of-dental-implant-failure
#3
Alan B Carr, Ricardo L Vidal Gonzalez, Li Jia, Christine M Lohse
PURPOSE: To identify associations between implant failure and selective serotonin reuptake inhibitor (SSRI) medication use in a cohort of consecutive patients receiving dental implants during a 20-year period. MATERIALS AND METHODS: A retrospective review was conducted of all patients who received at least 1 dental implant from January 1, 1995, through December 31, 2014, assessing their history of SSRI use, active SSRI use, and SSRI use during follow-up with implant failure...
January 13, 2019: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/30636029/human-gingival-epithelial-growth-in-vitro-on-a-polymer-infiltrated-ceramic-network-restorative-material
#4
Martin J Smallidge, Jennifer V Sabol, Cynthia Aita-Holmes, Henry Chuang, Douglas P Dickinson
PURPOSE: To investigate the growth of primary human gingival epithelial (HGE) cells on polymer-infiltrated ceramic network (PICN) material (Vita Enamic) with different surface roughnesses. MATERIALS AND METHODS: PICN material specimens were polished with either silica carbide paper (grit-polished) or the manufacturer's polishing wheels (wheel-polished), and the surface roughness (Ra ) measured. HGE cells were seeded and grown for 1, 3, or 6 days. Growth on tissue culture plastic was used as a control...
January 12, 2019: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/30636017/impact-of-occlusal-intercuspal-angulation-on-the-quality-of-cad-cam-lithium-disilicate-crown
#5
Ramtin Sadid-Zadeh, Rui Li, Reena Patel, Steven Makowka, Lorin M Miller
PURPOSE: Modification of intercuspal angulation (ICA) influences the amount of tooth structure removal, which may impact the retention and resistance form of the preparation. This study evaluated the impact of ICA on the marginal gap of CAD/CAM crowns and the influence that tooth structure removal, caused by variation of ICA, has on the resistance and retention form of the preparation. MATERIALS AND METHODS: Sixty ivorine molars were manufactured with various ICAs (100°, 110°, 120°, 140°, 160°, and 180°; 10 per group)...
January 12, 2019: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/30628147/effect-of-fabrication-technique-on-the-marginal-discrepancy-and-resistance-of-lithium-disilicate-crowns-an-in-vitro-study
#6
Ramtin Sadid-Zadeh, Rui Li, Lorin M Miller, Michael Simon
PURPOSE: To evaluate the impact of fabrication technique on the marginal fit and resistance of lithium disilicate crowns. MATERIALS AND METHODS: Twelve ivorine molars were prepared to receive lithium disilicate crowns. The preparations were digitally recorded using an intraoral scanner, and the crowns were designed following the anatomy of an unprepared tooth using a design software. The designed crowns were fabricated using 3 techniques: 1) milling from lithium disilicate blocks using a 3-axis milling machine (3XM), 2) milling from lithium disilicate blocks using a 5-axis milling machine (5XM), and 3) milling from resin-wax billet using a 5-axis milling machine, followed by heat-pressing the pattern into lithium disilicate (5XWP)...
January 9, 2019: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/30624832/zirconia-primers-improve-the-shear-bond-strength-of-dental-zirconia
#7
René Steiner, Irene Heiss-Kisielewsky, Vincent Schwarz, Dagmar Schnabl, Herbert Dumfahrt, Johannes Laimer, Otto Steinmassl, Patricia-Anca Steinmassl
PURPOSE: Various resin cements and priming agents are available for adhesive luting of zirconia restorations. The purpose of this study was to investigate how cement type and priming protocol affect the shear bond strength on zirconia ceramics. MATERIALS AND METHODS: Yttria-stabilized tetragonal zirconia polycrystalline ceramic cylinders were bonded to flat zirconia ceramic surfaces using 7 commercially available resin cements. Ten specimens of each cement group were pre-treated with a universal primer, and 10 specimens per group were bonded without pre-treatment...
January 9, 2019: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/30582263/influence-of-primers-and-additional-resin-layer-on-zirconia-repair-bond-strength
#8
Fereshteh Shafiei, Zahra Fattah, Nazanin Kiomarsi, Mohammad Hossein Dashti
PURPOSE: To evaluate the influence of alloy/zirconia primer and 10-methacryloyloxydecyl dihydrogen phosphate (MDP)-containing resin layer treatments on the shear bond strength (SBS) of composite resin to zirconia after aging. MATERIALS AND METHODS: Sixty zirconia (Y-TZP) blocks were air-abraded (35-μm Al2 O3 ) and divided into 6 experimental groups (n = 10) in terms of primer/resin layer as follows: 1) control, without any primer or resin; 2) AP, Alloy Primer; 3) ZPP, Z-Prime Plus; 4) PL/ZPP, Z-Prime Plus with light polymerization; 5) AP+SEB, Alloy Primer along with light-cured bonding resin of a self-etch adhesive system (SE Bond); and 6) ZPP+SEB, Z-Prime Plus with SE Bond...
December 24, 2018: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/30582259/a-30-year-follow-up-of-a-patient-with-mandibular-complete-arch-fixed-implant-supported-prosthesis-on-4-implants-a-clinical-report
#9
Thomas J Balshi, Glenn J Wolfinger, Stephen F Balshi, Avinash S Bidra
Mandibular complete-arch fixed implant-supported prostheses are recognized as one of the earliest and most popular prostheses in implant dentistry. This prosthesis was the main focus in the early era of osseointegration. Despite its widespread popularity, few clinical reports exist have described long-term follow-up greater than 10 years for this type of prosthesis. This report describes a 30-year follow-up of a patient who underwent treatment for a mandibular complete arch fixed implant-supported prosthesis with 4 machined surfaced implants, opposing a maxillary complete denture...
December 24, 2018: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/30582280/reporting-of-sample-size-parameters-in-randomized-controlled-trials-published-in-prosthodontic-journals
#10
Herman B Dumbrigue, Ethan C Dumbrigue, Derek C Dumbrigue, Marianne I Chingbingyong
PURPOSE: An important consideration in the proper planning of randomized controlled trials (RCTs) is the determination of sample size. A study may fail to answer its research question if the sample size is inadequate, while a large enough sample size may be impractical to implement. The purpose of this study is to describe the reporting of sample size methodology and parameters used in RCTs published in prosthodontic journals. MATERIALS AND METHODS: A MEDLINE search for publications categorized as RCTs was conducted for articles in The Journal of Prosthodontics and The Journal of Prosthetic Dentistry published from 2008-2017...
December 23, 2018: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/30569510/the-friction-clasp
#11
Donald M Belles
This clinical report describes a modification of the conventional direct retainer design, which incorporates advantages of the dual path partial denture, but with a greater ease of design and fabrication. The main advantage of this technique is minimizing the clasp display on Class III and Class IV removable partial denture prostheses. A clinical example using this design is described. This article is protected by copyright. All rights reserved.
December 20, 2018: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/30548895/effect-of-thermomechanical-and-static-loading-on-the-load-to-fracture-of-metal-ceramic-monolithic-and-veneered-zirconia-posterior-fixed-partial-dentures
#12
Carlos Lopez-Suarez, Celia Tobar, Maria Fernanda Sola-Ruiz, Jesus Pelaez, Maria J Suarez
PURPOSE: To evaluate the influence of static (not pre-loaded) and thermomechanical loading on the load to fracture of metal-ceramic, monolithic and veneered zirconia computer-aided design/computer-aided manufacturing (CAD/CAM) posterior fixed partial dentures (FPDs). MATERIALS AND METHODS: One hundred standardized specimens with 2 abutments screwed onto a platform were prepared from stainless steel to receive a posterior 3-unit FPD with an intermediate pontic. Specimens were randomly divided into 5 groups (n = 20): Metal-ceramic (control group), Lava Zirconia system, Vita In-Ceram YZ, IPS e-max ZirCAD, and Lava Plus...
December 13, 2018: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/30536831/differential-mucosal-gene-expression-patterns-in-candida-associated-chronic-oral-denture-stomatitis
#13
Steven Offenbacher, Silvana P Barros, Sompop Bencharit, Ning Yu, John Preisser, Kevin Moss, Zvi G Loewy
PURPOSE: Denture stomatitis is a common condition manifested by inflammation of the oral mucous membrane beneath a denture. The objective of this study was to compare the transcriptome of human palatal mucosa with chronic oral stomatitis-associated Candida albicans infection to that of healthy oral mucosa. MATERIALS AND METHODS: Oral palatal biopsies were obtained from 17 healthy and 15 C. albicans-infected stomatitis subjects for whole transcriptome analyses. The presence of C...
December 10, 2018: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/30537128/cytogenetic-biomonitoring-of-dental-technicians-a-cross-sectional-study
#14
Antonija Tadin, Lidia Gavic, Ivana Jurkovic, Neven Vidovic, Daniel Jerkovic, Davor Zeljezic
PURPOSE: This is a cross-sectional study to assess the incidence of micronuclei and other nuclear morphological changes in buccal epithelial cells of dental technicians. MATERIALS AND METHODS: The study was conducted on 45 dental technicians vs. 2 control groups: 50 dentists and 50 dental assistants. DNA damage was analyzed in exfoliated buccal mucosa cells by micronucleus assay. The differences in the frequency of detected types of cytogenetic damage between experimental groups were analyzed by applying 2-way ANOVA with Tukey's HSD post-hoc test...
December 7, 2018: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/30537093/the-effect-of-ceramic-type-and-background-color-on-shade-reproducibility-of-all-ceramic-restorations
#15
Khaled Q Al Hamad, Ismaeel Obaidat, Nadim Z Baba
PURPOSE: To investigate the effects of background color on shade reproduction using CAD/CAM zirconia and lithium disilicate ceramics. MATERIALS AND METHODS: A plastic tooth was prepared for an all-ceramic crown, scanned, and tooth shaped light background dies were manufactured. Full contour crowns were milled from translucent zirconia (ZT) and low translucency lithium disilicates (E [LT]). Copings from opaque zirconia (Z) and medium opacity lithium disilicate (E[MO]) ceramics were milled and layered with veneering porcelain to full contour...
December 7, 2018: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/30515911/finite-element-stress-analysis-of-applied-forces-to-implants-and-supporting-tissues-using-the-all-on-four-concept-with-different-occlusal-schemes
#16
Nurullah Türker, Ulviye S Büyükkaplan, Steven J Sadowsky, Mehmet M Özarslan
PURPOSE: The aim of this study was to evaluate stress distributions on implants and alveolar bone due to occlusal load produced during chewing by prostheses prepared according to the All-on-Four concept with different occlusal schemes using a finite element analysis method. MATERIALS AND METHODS: On standard jaw models, teeth were set in accordance with the basic standards of canine-guided occlusion, group function occlusion, bilateral balanced occlusion (BBO), lingualized occlusion, and monoplane occlusion schemes...
December 4, 2018: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/30484925/association-between-early-implant-failure-and-prosthodontic-characteristics
#17
Alan B Carr, Nikita Sinha, Christine M Lohse, Olivia M Muller, Thomas J Salinas
PURPOSE: To identify associations between early implant failure and prosthodontic characteristics that could be used to guide subsequent continuous quality improvement efforts of patient care. MATERIALS AND METHODS: An implant-level analysis was performed in which data were abstracted from a prospective clinical database of all adult patients treated with implants and followed up from January 2000 through December 2014 at the Department of Dental Specialties at Mayo Clinic in Rochester, Minnesota...
November 28, 2018: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/30478870/load-bearing-capacity-of-monolithic-zirconia-fixed-dental-prostheses-fabricated-with-different-connector-designs-and-embrasure-shaping-methods
#18
Fahad Bakitian, Przemek Seweryniak, Evaggelia Papia, Christel Larsson, Per Vult von Steyern
PURPOSE: To investigate the load-bearing capacity and failure mode of monolithic zirconia fixed dental prostheses (FDPs) fabricated with different connector designs and embrasure shaping methods. MATERIAL AND METHODS: Seventy 4-unit zirconia FDPs (with 2 premolar pontics) were fabricated and divided into 7 groups (n = 10) according to the different connector designs gained by using different embrasure shaping methods. The groups were as follows: monolithic FDPs fabricated with sharp embrasures, monolithic FDPs fabricated with blunt embrasures, monolithic FDPs fabricated with blunt embrasures and no occlusal embrasures, 2 groups of monolithic FDPs fabricated with blunt embrasures and interproximal separations made with diamond discs at the soft stage and at the fully sintered stage, and monolithic FDPs fabricated with blunt embrasures and interproximal separation accentuated by localized porcelain build-up...
November 26, 2018: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/30461125/direct-3d-printing-of-flexible-nasal-prosthesis-optimized-digital-workflow-from-scan-to-fit
#19
Amjad Nuseir, Muhanad Moh'd Hatamleh, Ahmad Alnazzawi, Mohammad Al-Rabab'ah, Belal Kamel, Esraa Jaradat
A maxillofacial prosthesis is a successful treatment modality to restore missing facial parts. Digital technologies and 3D printing are employed in constructing facial prostheses such as ears; however, their application is still partial, and final prostheses are usually manufactured conventionally using stone molds. This report aims to introduce a complete digital workflow to construct a nasal prosthesis and compare it to the conventional workflow of a patient requiring a nasal prosthesis. A computer tomography scan showing the defect was exported to specialized software to create 3D reconstructions of the patient's face and underlying bone...
November 20, 2018: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/30430690/technique-to-confirm-occlusal-contact-using-an-articulating-paper-holder-equipped-with-tongue-depressor
#20
Naomi Tanoue, Terumi Ayuse, Taku Fujiwara, Takao Ayuse
This technical report describes a simple procedure for verifying occlusal contact with the use of a new device that combines the functions of a tongue depressor and an articulating paper holder. Verifying occlusal contact and/or the maxillomandibular relationship record can be expected to be simpler and easier with this device compared to the conventional holder, especially for patients with tongue hypertrophy or obesity and those treated under general anesthesia, among others.
November 14, 2018: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
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