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

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https://www.readbyqxmd.com/read/29333707/impact-of-gastric-acid-induced-surface-changes-on-mechanical-behavior-and-optical-characteristics-of-dental-ceramics
#1
Aditi Kulkarni, James Rothrock, Jeffery Thompson
PURPOSE: To test the impact of exposure to artificial gastric acid combined with toothbrush abrasion on the properties of dental ceramics. Earlier research has indicated that immersion in artificial gastric acid has caused increased surface roughness of dental ceramics; however, the combined effects of acid immersion and toothbrush abrasion and the impact of increased surface roughness on mechanical strength and optical properties have not been studied. MATERIALS AND METHODS: Three commercially available ceramics were chosen for this study: feldspathic porcelain, lithium disilicate glass-ceramic, and monolithic zirconium oxide...
January 14, 2018: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/29323782/the-effect-of-surface-treatments-on-the-mechanical-and-optical-behaviors-of-cad-cam-restorative-materials
#2
Sevcan Kurtulmus-Yilmaz, Esra Cengiz, Salim Ongun, Izgen Karakaya
PURPOSE: To evaluate the effect of different surface treatments on mechanical and optical properties of lithium disilicate ceramic (IPS e.max CAD), 2 resin nanoceramics (Lava Ultimate, GC Cerasmart), and polymer-infiltrated ceramic network material (Vita Enamic). MATERIALS AND METHODS: CAD/CAM blocks were sectioned into 4 × 1 × 14 mm3 bars for three-point bending test and 1 × 8 × 8 mm3 square specimens were obtained for color and translucency measurements. Bar-shaped and square specimens were divided into five groups according to the surface treatment method as: control (no treatment), hydrofluoric acid etching, airborne-particle abrasion, 2 W and 3 W Er,Cr:YSGG laser irradiation (n = 10)...
January 11, 2018: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/29323779/effect-of-different-liners-on-fracture-resistance-of-premolars-restored-with-conventional-and-short-fiber-reinforced-composite-resins
#3
Fereshteh Shafiei, Maryam Doozandeh, Dordaneh Ghaffaripour
PURPOSE: To see whether applying four different liners under short fiber-reinforced composite (SFRC), everX Posterior, compared to conventional composite resin, Z250, affected their strengthening property in premolar MOD cavities. MATERIALS AND METHODS: Mesio-occluso-distal (MOD) cavities were prepared in 120 sound maxillary premolars divided into 10 groups (n = 12) in terms of two composite resin types and 4 liners or no liner. For each composite resin, in 5 groups no liner, resin-modified glass ionomer (RMGI), conventional flowable composite (COFL), self-adhesive flowable composite resin (SAFL), and self-adhesive resin cement (SARC) were applied prior to restoring incrementally...
January 11, 2018: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/29323776/remineralization-of-natural-human-carious-dentin-lesions-with-an-experimental-whisker-reinforced-atraumatic-restorative-treatment-composite
#4
Chao Zhang, Stephen D Campbell, Sabine H Dickens, Bin Yang
PURPOSE: To evaluate the remineralization of natural human dentin caries with an experimental whisker-reinforced Atraumatic Restorative Treatment (ART) composite. MATERIALS AND METHODS: Teeth with moderate active dentin caries were prepared with caries-disclosing dye and hand instruments, restored with ART or resin-modified glass ionomer cement (RM-GIC), and then wet sliced into 120-μm sections with 15 sections in each group. After taking transverse microradiographs and implementing digital image analysis to determine the "mineral-loss-before," each section was incubated in artificial saliva solution (pH = 7...
January 11, 2018: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/29323773/direct-fiber-reinforced-interim-fixed-partial-dentures-six-year-survival-study
#5
Luciana Maria Goguta, Adrian Candea, Diana Lungeanu, Mirela Frandes, Anca Jivanescu
PURPOSE: Mechanical and optical studies of glass fiber composites have revealed great resistance and satisfactory bonds between the glass fibers and composite resins. This study aimed to evaluate the long-term survival of anterior and posterior direct glass fiber-reinforced composite (FRC) fixed partial dentures (FPD). MATERIALS AND METHODS: Twenty-three patients (9 men, 14 women) aged 18 to 67 received 23 d-FRC-FPDs. The frameworks of the FPDs were unidirectional pre-impregnated glass fibers (ever Stick C&B)...
January 11, 2018: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/29322657/polyetheretherketone-overlay-prosthesis-over-high-noble-ball-attachments-to-overcome-base-metal-sensitivity-a-clinical-report
#6
Panagiotis Zoidis
A modified polyetheretherketone (PEEK) framework material in combination with heat-polymerized denture base acrylic resin was used for the fabrication of an overlay prosthesis for a patient sensitive to base metals. High noble metal was used for the fabrication of the post/coping/ball attachment assemblies to promote retention and stability. These protruding attachments into the acrylic resin could result in stress concentration; therefore, a framework is often used to strengthen the prosthesis. PEEK frameworks could be a treatment alternative to high noble or Ti frameworks since they combine good mechanical properties with biocompatibility, reduced cost, and common laboratory procedures...
January 11, 2018: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/29322644/rosemary-castor-oils-and-propolis-extract-activity-against-candida-albicans-and-alterations-on-properties-of-dental-acrylic-resins
#7
Daiane Heidrich, Carmen Beatriz Borges Fortes, Aline Taís Mallmann, Clarissa Machado Vargas, Paula Borges Arndt, Maria Lúcia Scroferneker
PURPOSE: To evaluate the in vitro activity of 8% rosemary, 2% castor oils, and 12% propolis glycolic extract against Candida albicans, as well as the physical changes of properties in colorless and pink acrylic resins after immersion in these liquids. MATERIALS AND METHODS: Colorimetric, roughness, and Knoop microhardness assays were evaluated in 25 specimens distributed into five groups (3 test groups and 2 control groups - distilled water and hypochlorite 1%), totaling five specimens per group for each acrylic resin (colorless and pink)...
January 11, 2018: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/29322600/using-enamel-matrix-derivative-to-improve-treatment-efficacy-in-periodontal-furcation-defects
#8
REVIEW
Reza Masaeli, Kavosh Zandsalimi, Zahra Lotfi, Lobat Tayebi
PURPOSE: Furcations are complicated periodontal defects. Untreated furcations lead to loss of the involved teeth and supporting tissues. It has been demonstrated that regenerative biomaterials are beneficial in reconstruction of the bone surrounding furcation-affected teeth. These biomaterials range from bone grafts and nonresorbable/resorbable barrier membranes to biologics that are able to trigger inactive regenerative processes in periodontal tissues. Selection of appropriate material(s) to treat furcations is challenging...
January 11, 2018: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/29322593/a-simplified-approach-to-fabricate-a-hollow-ocular-prosthesis
#9
Brijesh Maskey, Suraj R B Mathema, Kanchana Shrestha, Amar Bhochhibhoya
The prosthetic rehabilitation of a large anophthalmic socket is always a challenge. It demands an equally sized ocular prosthesis to replace lost tissue volume. A conventional solid acrylic ocular prosthesis may be deterrent to retention and esthetics because of its weight, which can be reduced by eliminating the mass of material within it. This article attempts to present a simplified and accurate technique to fabricate a hollow ocular prosthesis using silicone putty cavity form. It is removed prior to final processing and serves to ensure appropriate uniform thickness of acrylic resin and optimal weight reduction of the definitive prosthesis without compromising mobility, esthetics, and structural integrity...
January 11, 2018: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/29322589/the-direct-cytotoxic-effects-of-different-hemostatic-agents-on-human-gingival-fibroblasts
#10
Nawaf Labban, Hanan AlOtaibi, Abdullah Mokeem, Mohammad AlJameel, Talal AlRasheed, Dalia Ali
PURPOSE: To evaluate the cytotoxic effects of different hemostatic agents (including Expasyl) on human gingival fibroblasts (HGFs) in vitro. MATERIALS AND METHODS: HGFs were cultured and exposed to either no medicament treatment or 1:200 dilution of six different hemostatic agents (Hemox-A, Hemodent, Astringedent, Vicostat, Expasyl, 3M ESPE) for 2, 5, 10 minutes, 1 hour, and 24 hours. Toxicity to HGFs was determined by lactate dehydrogenase activity (LDH) and colorimetric (WST-1) assays...
January 11, 2018: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/29315947/color-in-zirconia-based-restorations-and-related-factors-a-literature-review
#11
REVIEW
Farhad Tabatabaian
Zirconia ceramic is a popular trend in esthetic and restorative dentistry. Computer-aided design/computer-aided manufacturing (CAD/CAM) systems have been well developed to fabricate zirconia frameworks and restorations with acceptable mechanical properties. Zirconia ceramics have excellent optical characteristics; however, achieving optimal esthetic outcomes with zirconia-based restorations is still challenging due to multiple effective factors on the final color. These factors are different layers of a zirconia-based restoration and its underlying structures including: dental substrate, cement, zirconia coping, veneering ceramic, and glaze...
January 9, 2018: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/29315956/fatigue-behavior-of-crystalline-reinforced-glass-ceramics
#12
Carolina Barbosa Vicari, Bárbara de Oliveira Magalhães, Jason Alan Griggs, Márcia Borba
PURPOSE: To evaluate the fatigue behavior of two crystalline-reinforced ceramics: leucite-reinforced (VL) and lithium disilicate-based (VD) glass-ceramics. MATERIALS AND METHODS: Bar-shaped specimens (16 × 4 × 1.2 mm) were produced for each ceramic using prefabricated CAD/CAM blocks. For each group, 30 specimens were subjected to a three-point flexural strength test in a universal testing machine. For VL and VD, 36 and 41 specimens were subjected to a cyclic fatigue test, respectively...
January 3, 2018: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/29314449/resin-cement-correspondence-with-try-in-paste-and-influence-on-the-immediate-final-color-of-veneers
#13
Edenize Cristina Vaz, Maysa Magalhães Vaz, Érica Miranda de Torres, João Batista de Souza, Terezinha de Jesus Esteves Barata, Lawrence Gonzaga Lopes
PURPOSE: To assess the correspondence of shades between try-in pastes and resin cements and their influence on the final color of veneers. MATERIALS AND METHODS: Bovine teeth (n = 140) were prepared and divided into 2 groups (a or b) according to ceramic veneer thickness (0.35 or 0.70 mm). Seventy teeth (n = 70) were distributed in 7 groups (groups 1 to 7a and groups 1 to 7b; n = 10). Try-in pastes and their corresponding resin cements were used according to the value: groups 1a and 1b (value -3); groups 2a and 2b (-2); groups 3a and 3b (-1); groups 4a and 4b (0); groups 5a and 5b (+1); groups 6a and 6b (+2); groups 7a and 7b (+3)...
January 3, 2018: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/29314433/the-effect-of-sintering-time-on-the-marginal-fit-of-zirconia-copings
#14
Amir Ali Reza Khaledi, Mahroo Vojdani, Mitra Farzin, Sudabeh Pirouzi, Sepideh Orandi
PURPOSE: This study analyzed the effect of different sintering times on the marginal adaptation of zirconia ceramic copings. MATERIALS AND METHODS: Thirty copings of pre-sintered 3Y-TZP blanks were milled and subsequently sintered in a special furnace for three different durations (n = 10 per group). The sintering time was 1 hour, 15 minutes for IPS e.max ZirCAD, 4 hours 20 minutes for Speed ZrO2, and 7 hours 20 minutes for the conventional ZrO2 group. The marginal gaps of specimens were measured at 18 spots on the master die by employing a digital microscope...
January 3, 2018: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/29286181/accuracy-of-different-implant-impression-techniques-evaluation-of-new-tray-design-concept
#15
David Yu Liu, Fathima Nashmie Cader, Jaafar Abduo, Joseph Palamara
PURPOSE: To evaluate implant impression accuracy with a new tray design concept in comparison to nonsplinted and splinted impression techniques for a 2-implant situation. MATERIALS AND METHODS: A reference bar titanium framework was fabricated to fit on 2 parallel implants. The framework was used to generate a resin master model with 2 implants that fit precisely against the framework. Three impression techniques were evaluated: (1) nonsplinted, (2) splinted, and (3) nonsplinted with modified tray impressions...
December 29, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/29285830/relevance-of-tongue-force-on-mandibular-denture-stabilization-during-mastication
#16
Jarosław Żmudzki, Grzegorz Chladek, Cezary Krawczyk
PURPOSE: Tongue activity, involving stereognosis of denture position, food bolus distribution, and direct denture pressing, can affect the stability of removable mandibular dentures. Knowledge of details of tongue activity in patients with removable dentures could contribute to the development of training methods to improve bilateral mastication. The hypothesis of this study was that tongue force improves mandibular complete denture stabilization on the atrophied foundation during mastication load transfer with a typical balanced occlusion...
December 29, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/29280304/evaluating-the-association-of-tooth-form-of-maxillary-central-incisors-with-face-shape-using-autocad-software-a-descriptive-study
#17
Aditi Mehndiratta, Mahantesh Bembalagi, Raghunath Patil
PURPOSE: To assess the different forms of maxillary central incisors (MCI) and determine their association with the shape of the face for men and women. MATERIALS AND METHODS: A total of 200 subjects (100 women, 100 men) aged between 18 and 30 years with healthy dentition were randomly selected from K.L.E. V.K Institute of Dental Sciences, Belagavi, India. Two standardized photographs (portrait and shape of the MCI) were taken for each subject and opened in AutoCAD 2009 software that was used to prepare technical drawings of face and tooth forms...
December 27, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/29271526/comparison-of-marginal-and-internal-adaptation-of-heat-pressed-and-cad-cam-porcelain-laminate-veneers-and-a-2-year-follow-up
#18
Mert Yuce, Mubin Ulusoy, Ayse Gozde Turk
PURPOSE: To compare marginal and internal adaptations of porcelain laminate veneers fabricated with heat-pressed and CAD/CAM techniques, and to evaluate the clinical performances 2 years after cementation. MATERIALS AND METHODS: Thirty heat-pressed and 31 CAD/CAM porcelain laminate veneers were fabricated for 12 patients. Silicone replicas of each veneer were obtained. Replicas were sectioned into 4 parts to measure adaptations of the veneers. A stereomicroscope was used to measure from 3 locations of replicas for marginal, and 9 locations for internal adaptations at 40x magnification...
December 22, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/29271041/comparison-of-the-cielab-and-ciede-2000-color-difference-formulas-on-gingival-color-space
#19
Cristina Gómez-Polo, Javier Montero, Miguel Gómez-Polo, Ana Martin Casado
PURPOSE: To evaluate the CIELAB and CIEDE2000 formulas to determine which better reflects the difference in color perception, and whether there are gender differences in color perception. MATERIALS AND METHODS: Fifty-six participants grouped 21 different-colored disks made of pink porcelain (color range: from 36.8 to 63.9 for L* , from 16.4 to 35.2 for a* , from 6.2 to 21.6 for b* ), in which the only requirement was that each group be comprised of disks with chromatically indistinguishable colors...
December 22, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/29271021/marginal-fit-of-metal-ceramic-copings-effect-of-luting-cements-and-tooth-preparation-design
#20
Juliana Gomes Dos Santos Paes de Almeida, Carlos Gramani Guedes, Filipe de Oliveira Abi-Rached, Flávia Zardo Trindade, Renata Garcia Fonseca
PURPOSE: To evaluate the effect of the triad finish line design, axial wall convergence angle, and luting cement on the marginal fit of metal copings used in metal-ceramic crowns. MATERIALS AND METHODS: Schematic dies and their respective copings were cast in NiCr alloy. The dies exhibited the following finish line/convergence angle combinations: sloping shoulder/6°, sloping shoulder/20°, shoulder/6°, shoulder/20°. Marginal fit was evaluated under a stereomicroscope, before and after cementation...
December 22, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
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