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

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https://www.readbyqxmd.com/read/28598591/effect-of-split-file-digital-workflow-on-crown-margin-adaptation
#1
Ryan R Sheridan, Ronald Verrett, Stephan Haney, John Schoolfield
PURPOSE: Computer-aided design/computer-aided manufacturing (CAD/CAM) is becoming increasingly integrated into dental practice workflow at a pace that exceeds scientific validation. The aim of this study is to evaluate a complete digital split-file protocol relative to segmental digital and analog techniques for restoring a single maxillary anterior edentulous space with custom abutment and crown. MATERIALS AND METHODS: Four treatment workflows were assessed: complete digital (CD), segmental digital (SD), milled wax (AM), and heat pressed and hand waxed (AH) and heat pressed...
June 9, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/28598590/impact-of-denture-cleansing-solution-immersion-on-some-properties-of-different-denture-base-materials-an-in-vitro-study
#2
Ahmad M Al-Thobity, Mohammed Gad, Aws ArRejaie, Talal Alnassar, Khalifa S Al-Khalifa
PURPOSE: To evaluate the effect of several denture cleansing solutions on the color stability, surface roughness, and flexural strength of three denture base materials. MATERIALS AND METHODS: Twenty-seven specimens were prepared using heat-polymerized (HP) denture base material, 27 using autopolymerized (AP) denture base material, and 27 using visible-light-polymerized (VLP) denture base, creating a total of 81 specimens. The specimens were randomly divided into three groups (n = 27): the distilled water group (DWG), Corega group (CG), and Renew group (RG)...
June 9, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/28598530/the-effect-of-temporary-cement-cleaning-methods-on-the-retention-of-crowns
#3
Mi-Young Song, Hongseok An, Eun-Jin Park
PURPOSE: To evaluate the effect of temporary cement cleaning methods on the retention of cemented crowns using zinc phosphate cement and resin-modified glass ionomer cement. MATERIALS AND METHODS: Forty titanium specimens were fabricated to simulate prepared molars with minimally retentive taper. The Ni-Cr cast crowns were fabricated, temporarily cemented, and separated. The specimens were divided into four groups according to the temporary cement cleaning method (n = 10) as follows: control group (no temporary cementation), orange solvent group, ultrasonic cleaning group, and air-abrasion group...
June 9, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/28598526/aspects-of-malpractice-in-prosthodontics
#4
REVIEW
Mohammad Zakaria Nassani
Crowns, fixed partial dentures, and removable dentures are the popular prosthetic dental restorations in current dental practice. Prosthodontic rehabilitation of the mouth, particularly in advanced and complex cases, requires careful planning, adequate clinical skills, and exacting technical standards. While a successful outcome is the ultimate goal for any prosthodontic treatment, complications, injuries, dissatisfaction, and/or failure may occur. When such events develop as a result of negligence or violation of standards of care, they are considered under the term of malpractice and may incur ethical and medico-legal implications...
June 9, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/28598524/nicotine-upregulates-coaggregation-of-candida-albicans-and-streptococcus-mutans
#5
Ali Ashkanane, Grace F Gomez, John Levon, L Jack Windsor, George J Eckert, Richard L Gregory
PURPOSE: Denture stomatitis is a condition of painless inflammation of denture-bearing mucosa. Reports indicate that nicotine, the major psychoactive ingredient in tobacco, increases growth of Streptococcus mutans and Candida albicans in denture biofilm. The purpose of this study was to determine the in vitro effects of nicotine on coaggregation of C. albicans with S. mutans. MATERIAL AND METHODS: C. albicans strain ATCC 10231, S. mutans strain UA159 (ATTC 700610), and nicotine dilutions (ranging from 0 to 32 mg/ml) were used for this study...
June 9, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/28561383/differences-in-lip-support-with-and-without-labial-flanges-in-a-maxillary-edentulous-population-part-4-patient-centered-analysis
#6
Avinash S Bidra, Foteini Touloumi, Rong Wu
PURPOSE: To study the subjective differences in facial esthetics evaluations and the ability to distinguish facial changes due to changes in lip support, when evaluated by patients themselves. An additional objective was to study the differences between patients' self-evaluation versus evaluation of other patients. MATERIALS AND METHODS: A total of 22 maxillary edentulous patients from the original sample of 31 patients described in Part 1 of the study, returned to participate in this part of the study...
May 31, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/28561382/differences-in-lip-support-with-and-without-labial-flanges-in-a-maxillary-edentulous-population-part-3-unblinded-and-discriminatory-subjective-analysis
#7
Avinash S Bidra, Viensuong Nguyen, Anna Manzotti, Chia-Ling Kuo
PURPOSE: To study the subjective differences in direct lip support assessments and to determine if dentists and laypeople are able to discern and correctly identify direct changes in lip support between flange and flangeless dentures. MATERIALS AND METHODS: A random sample of 20 maxillary edentulous patients described in part 2 of the study was used for analysis. A total of 60 judges comprising 15 general dentists, 15 prosthodontists, and 30 laypeople, the majority of who were distinct from part 2 of the study, were recruited...
May 31, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/28561307/differences-in-lip-support-with-and-without-labial-flanges-in-a-maxillary-edentulous-population-part-2-blinded-subjective-analysis
#8
Avinash S Bidra, Anna Manzotti, Rong Wu
PURPOSE: To study the subjective differences in facial esthetics evaluations among lay people, general dentists, and prosthodontists, when evaluating images of patients wearing a maxillary denture with a labial flange in comparison to an experimental flangeless denture. MATERIALS AND METHODS: A random sample of 20 maxillary edentulous patients from the original sample of 31 patients described in part 1 of the study was selected for this study. A total of 60 judges comprising 15 general dentists, 15 prosthodontists, and 30 lay people were recruited for subjective analysis...
May 31, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/28561267/differences-in-lip-support-with-and-without-labial-flanges-in-a-maxillary-edentulous-population-part-1-objective-analysis
#9
Avinash S Bidra, Guillermo Zapata, John R Agar, Thomas D Taylor, James Grady
PURPOSE: To study the objective differences in lip support using common facial soft tissue markers, when evaluating patients wearing a maxillary denture with a labial flange in comparison to an experimental flangeless denture. MATERIALS AND METHODS: A total of 31 maxillary edentulous patients who were esthetically satisfied with their existing maxillary denture were recruited in this clinical study. The maxillary denture was then duplicated in clear acrylic resin...
May 31, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/28543925/comparative-effect-of-different-polymerization-techniques-on-the-flexural-and-surface-properties-of-acrylic-denture-bases
#10
Mohammed M Gad, Shaimaa M Fouda, Aws S ArRejaie, Ahmad M Al-Thobity
PURPOSE: Polymerization techniques have been modified to improve physical and mechanical properties of polymethylmethacrylate (PMMA) denture base, as have the laboratory procedures that facilitate denture construction techniques. The purpose of the present study was to investigate the effect of autoclave polymerization on flexural strength, elastic modulus, surface roughness, and the hardness of PMMA denture base resins. MATERIALS AND METHODS: Major Base and Vertex Implacryl heat-polymerized acrylic resins were used to fabricate 180 specimens...
May 22, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/28514047/a-simplified-approach-for-fabrication-of-a-lightweight-individualized-impression-tray-with-the-aid-of-existing-obturator-prosthesis-using-lost-salt-technique
#11
Amar Bhochhibhoya, Binod Acharya, Samskar Bickram Rana, Rinu Sharma, Brijesh Maskey
Maxillary defects resulting from ablative oncologic surgery can be extensive and usually have complex contours. Impression procedures for such defects can be time consuming and cumbersome, challenging the skills of even the most-experienced clinician. A well-oriented impression tray with proper extension and adequate contour is essential for successfully capturing the relevant details in impression. This article describes a method using the patient's existing obturator prosthesis to simplify and expedite the fabrication of a lightweight individualized impression tray directly on an irreversible hydrocolloid impression, thus avoiding the preliminary impression procedure for the patient...
May 17, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/28514042/effect-of-crystallization-firing-on-marginal-gap-of-cad-cam-fabricated-lithium-disilicate-crowns
#12
Steven A Gold, Jack L Ferracane, Juliana da Costa
PURPOSE: To evaluate the marginal gaps of CAD/CAM (CEREC 3) produced crowns made from leucite-reinforced glass-ceramic (IPS Empress CAD) blocks (LG), and lithium-disilicate (IPS e.max CAD) blocks before (LD-B), and after (LD-A) crystallization firing. MATERIALS AND METHODS: A human molar tooth (#19) was mounted with adjacent teeth on a typodont and prepared for a full-coverage ceramic crown. The typodont was assembled in the mannequin head to simulate clinical conditions...
May 17, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/28513977/use-of-high-performance-polymers-as-dental-implant-abutments-and-frameworks-a-case-series-report
#13
Mohammad Al-Rabab'ah, Wala'a Hamadneh, Ismail Alsalem, Ameen Khraisat, Ashraf Abu Karaky
Dental implant abutments can be made of different materials including titanium, gold, zirconia, alumina, and polymeric materials. Polyetheretherketone (PEEK) is a high performance thermoplastic polymer that can be used as a dental implant abutment material. It has an elastic modulus comparable to bone and can reduce stress shielding. PEEK is a radiolucent material that can allow better radiographic imaging of peri-implant tissues and can be veneered with composite materials or bonded to ceramics. PEEK is widely used in orthopedic and spinal surgeries, and it possesses mechanical and biological characteristics that encourage its use as dental implant abutments...
May 17, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/28513973/width-length-ratio-in-maxillary-anterior-teeth-comparative-study-of-esthetic-preferences-among-professionals-and-laypersons
#14
Lorena Álvarez-Álvarez, Ana Orozco-Varo, Gema Arroyo-Cruz, Emilio Jiménez-Castellanos
PURPOSE: Many studies have examined the esthetic preferences of professionals in the maxillary anterior region; however, only a few have taken into account the ratios that are more frequent within the population or other ratios suggested in the literature as ideal. Previous studies also failed to compare them with the esthetic preferences of the lay population with regards to the smile. The purpose of this study is to highlight the differences when perceiving the esthetics of smiles between general dentists and laypersons, and linking them with the width/length of the maxillary anterior teeth...
May 17, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/28513897/quality-and-survival-of-direct-light-activated-composite-resin-restorations-in-posterior-teeth-a-5-to-20-year-retrospective-longitudinal-study
#15
REVIEW
Ernesto Borgia, Rosario Baron, Jose Luis Borgia
PURPOSE: To analyze the clinical success of direct light-activated composite resin restorations in posterior teeth. The quality of the margins and occlusal surfaces were evaluated, as well as their survival, according to their extensions and locations. The clinical performance of posterior composite resin restorations with different compositions were compared. All restorations were performed by the first author in his private practice, in a 5- to 20-year period. MATERIALS AND METHODS: Several types of composite resins, provided by different manufacturers, were placed in posterior teeth, after isolation with rubber dams...
May 17, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/28513894/the-dentoalveolar-prosthesis-a-novel-approach-in-the-reconstruction-of-hard-and-soft-tissue-deficiencies
#16
James K Doll, Peter Barndt, Gerald Grant
A clinical problem commonly encountered by the advanced restorative dentist is a requirement to replace missing teeth and the supporting alveolus in areas adjacent to healthy or manageable dentition. A potential solution could utilize a dentoalveolar prosthesis fabricated on two or more implants in the edentulous area. The implant substructure, or framework, may be cast, milled, or selectively laser melted from a variety of metals. A superstructure, or ceramic overlay incorporating a ceramic or composite resin gingival tissue component, is constructed to fit over the implant substructure and luted to the substructure with resin cement...
May 17, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/28452411/effect-of-thickness-of-zirconia-ceramic-on-its-masking-ability-an-in-vitro-study
#17
Farhad Tabatabaian, Sara Dalirani, Mahshid Namdari
PURPOSE: Color-masking ability of zirconia ceramics as coping materials has not been clearly understood in zirconia-based restorations. This in vitro study aimed to evaluate the effect of zirconia ceramic thickness on its masking ability, and to define a thickness cutoff for the tested ceramic. MATERIALS AND METHODS: Ninety zirconia disc specimens, in nine thickness groups including 0.4, 0.6, 0.8, 1, 1.2, 1.4, 1.6, 1.8, and 2 mm were fabricated. A white substrate and a black substrate were prepared...
April 28, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/28422367/microtensile-bond-strength-of-a-resin-cement-to-silica-based-and-y-tzp-ceramics-using-different-surface-treatments
#18
Alireza Keshvad, Seyed Mohammad Reza Hakimaneh
PURPOSE: To evaluate the effects of different surface treatments on the microtensile bond strength (μTBS) of bonding between resin cement and lithia or zirconia-based ceramics using an in vitro study. MATERIALS AND METHODS: Three zirconia ceramic blocks (IPS e.max ZirCAD) and three lithium disilicate ceramic blocks (IPS e.max CAD) were sintered and duplicated in resin composite. The zirconia specimens underwent various treatments (n = 1): (i) Sandblast + primer (ZiSa); (ii) sandblast + laser irradiation + primer (ZiSaLa); or (iii) laser irradiation + primer (ZiLa)...
April 19, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/28422359/clinical-evaluation-of-indirect-particle-filled-composite-resin-cad-cam-partial-crowns-after-24-months
#19
Moritz Zimmermann, Christina Koller, Marcel Reymus, Albert Mehl, Reinhard Hickel
PURPOSE: Resin-based CAD/CAM compound materials might be promising for single-tooth restorations. Insufficient clinical data are available for this new material class. The purpose of this study was to describe initial clinical in vivo results for indirect particle-filled composite resin CAD/CAM restorations after 24 months. MATERIALS AND METHODS: Indirect particle-filled composite resin restorations were fabricated with a CAD/CAM method (CEREC Bluecam intraoral scanner, CEREC MCXL milling unit) by calibrated dental students...
April 19, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/28422353/comprehensive-review-and-comparison-of-the-disinfection-techniques-currently-available-in-the-literature
#20
REVIEW
Ahila S Chidambaranathan, Muthukumar Balasubramanium
The goal of disinfection in the dental office is to prevent the spread of infection from one patient to another and maintain the safety of the dental care providers. Prevention of cross infection has significant effect on infection control. The standard procedure of rinsing impressions under tap water immediately after removal from the mouth eliminates microorganisms along with saliva and blood. A broad search on published literature was done using the keywords impression materials, disinfection method, and sterilization of dental impression from 1980 to 2016 in Medline, Google Scholar, the internet, and textbooks...
April 19, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
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