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https://www.readbyqxmd.com/read/29661579/effect-of-acid-etching-on-tridimensional-microstructure-of-etchable-cad-cam-materials
#1
Fabián Murillo-Gómez, Regina Guenka Palma-Dibb, Mario Fernando De Goes
OBJECTIVE: Evaluate if etching protocols affect superficial/internal microstructural integrity of CAD/CAM ceramic materials. METHODS: Sixty blocks (3×3×3mm) of IPS/Empress-LEU, IPS/e.max-LDC (Ivoclar-Vivadent) and Enamic-PIC (VITA) were used. Lateral surfaces from each block were isolated with Teflon strip and petroleum jelly to keep them untouched. Specimens were distributed into 6 groups (n=10): 1. no treatment (C); 2. hydrofluoric acid (HF) 5%, 20s (HF5%20s); 3...
April 13, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29658069/nine-prophylactic-polishing-pastes-impact-on-discoloration-gloss-and-surface-properties-of-a-cad-cam-resin-composite
#2
Anja Liebermann, Sebastian Spintzyk, Marcel Reymus, Ernst Schweizer, Bogna Stawarczyk
OBJECTIVES: To investigate discoloration reduction and changes of surface properties of a CAD/CAM resin composite after 14 days´ storage in red wine and polishing with nine different prophylactic polishing pastes (PPPs). MATERIALS AND METHODS: Rectangular discs (N = 172) were fabricated and polished (P4000) using GC Cerasmart (GC Europe) to investigate different polishing protocols with 1-4 related descending PPPs (22 in total): Cleanic/CLE-Kerr, CleanJoy/CLJ-Voco, Clean Polish/Super Polish/SPO-Kerr, Clinpro Prophy Paste/CPP-3M, Détartrine/DET-Septodont, Nupro/NUP-Dentsply Sirona, Prophy Paste CCS/CCS-Directa, Proxyt/PXT-Ivoclar Vivadent, and Zircate/ZIR Prophy Paste-Dentsply Sirona...
April 16, 2018: Clinical Oral Investigations
https://www.readbyqxmd.com/read/29657537/analysis-of-vertical-marginal-discrepancy-in-feldspathic-porcelain-crowns-manufactured-with-different-cad-cam-systems-closed-and-open
#3
Fabio Kricheldorf, Cleuber Rodrigo de Souza Bueno, Wilson da Silva Amaral, Joel Ferreira Santiago Junior, Hugo Nary Filho
Objective: The objective of this study is to compare the marginal adaptation of feldspathic porcelain crowns using two computer-aided design/computer-aided manufacturing systems, one of them is open and the other is closed. Materials and Methods: Twenty identical titanium abutments were divided into two groups: open system (OS), where ceramic crowns were created using varied equipment and software, and closed system (CS), where ceramic crowns were created using the CEREC system...
January 2018: European Journal of Dentistry
https://www.readbyqxmd.com/read/29657528/digital-versus-conventional-techniques-for-pattern-fabrication-of-implant-supported-frameworks
#4
Marzieh Alikhasi, Ahmad Rohanian, Safoura Ghodsi, Amin Mohammadpour Kolde
Objective: The aim of this experimental study was to compare retention of frameworks cast from wax patterns fabricated by three different methods. Materials and Methods: Thirty-six implant analogs connected to one-piece abutments were divided randomly into three groups according to the wax pattern fabrication method ( n = 12). Computer-aided design/computer-aided manufacturing (CAD/CAM) milling machine, three-dimensional printer, and conventional technique were used for fabrication of waxing patterns...
January 2018: European Journal of Dentistry
https://www.readbyqxmd.com/read/29655527/the-smiling-scan-technique-facially-driven-guided-surgery-and-prosthetics
#5
Alessandro Pozzi, Lorenzo Arcuri, Peter K Moy
PURPOSE: To introduce a proof of concept technique and new integrated workflow to optimize the functional and esthetic outcome of the implant-supported restorations by means of a 3-dimensional (3D) facially-driven, digital assisted treatment plan. METHODS: The Smiling Scan technique permits the creation of a virtual dental patient (VDP) showing a broad smile under static conditions. The patient is exposed to a cone beam computed tomography scan (CBCT), displaying a broad smile for the duration of the examination...
April 11, 2018: Journal of Prosthodontic Research
https://www.readbyqxmd.com/read/29628736/comparative-evaluation-of-dimensional-stability-of-impression-materials-from-developing-countries-and-developed-countries-after-disinfection-with-different-immersion-disinfectant-systems-and-ultraviolet-chamber
#6
Rupandeep Kaur Samra, Shreenivas Vasant Bhide
Objectives: It was to analyse and compare the effect of different disinfectant systems on the dimensional stability of commonly used irreversible hydrocolloid and addition silicone impression materials from developing countries as compared to materials from developed countries. Material and methods: Disinfectant systems used were glutaraldehyde, sodium hypochlorite and ultraviolet chamber. The stability after disinfection of commonly used alginate and addition silicone of native origin (Algin-Gum & Ad-Sil) was compared with similar impression materials from developed countries (Vignette and Aquasil) and results compared...
April 2018: Saudi Dental Journal
https://www.readbyqxmd.com/read/29627610/three-dimensional-cad-cam-imaging-of-the-maxillary-sinus-in-ageing-process
#7
Kvetuse Lovasova, David Kachlik, Mirela Rozpravkova, Maria Matusevska, Jana Ferkova, Darina Kluchova
OBJECTIVES: During the physiological ageing process atrophy of the alveolar bone appears in vertical direction. This bone resorption causes pushing the limits of the maxillary sinus at the expense of a degraded bone. The sinus volume increases due to the facial development in children and adolescents or during the ageing process due to the loss of teeth and bone mass. The main aim of this study is to determine the sinus shape and sinus floor morphology related to age. MATERIALS AND METHODS: Human adult male and female cadaveric heads (aged 37 to 83 years) with different dental status were used...
April 5, 2018: Annals of Anatomy, Anatomischer Anzeiger: Official Organ of the Anatomische Gesellschaft
https://www.readbyqxmd.com/read/29627214/digital-technology-for-performing-a-nasopalatine-and-greater-palatine-nerve-block-with-a-modified-implant-surgical-guide-a-technique-article
#8
Ankur Dahiya, Antoanela Garbacea, Mathew T Kattadiyil, Abdulaziz AlHelal
This article describes a computer-aided design and computer-aided manufacturing (CAD-CAM) technique to perform a precise nerve block of the nasopalatine and greater palatine nerves by using an implant surgical guide. The technique uses additional guide anchor pins planned and positioned for specific anatomic landmarks during guided implant surgical guide planning. A relief modification virtually designed on the intaglio surface of the surgical guide allows for palatal soft tissue distension following administration of local anesthetic...
April 5, 2018: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/29627213/macro-and-microtopographical-examination-and-quantification-of-cad-cam-composite-resin-2-and-3-body-wear
#9
Carolin Stöckl, Rüdiger Hampe, Bogna Stawarczyk, Miriam Haerst, Malgorzata Roos
STATEMENT OF PROBLEM: The selection of an appropriate restorative material based on wear behavior is important for the long-term success of a dental restoration. For computer-aided design and computer-aided manufacturing (CAD-CAM) composite resins, information about their wear resistance and wear mechanism is scarce. PURPOSE: The purpose of this in vitro study was to compare the 2- and 3-body wear of CAD-CAM composite resins with that of lithium disilicate ceramic and to develop analysis software...
April 5, 2018: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/29627211/intraoral-scan-bodies-in-implant-dentistry-a-systematic-review
#10
REVIEW
Ryan M Mizumoto, Burak Yilmaz
STATEMENT OF PROBLEM: Intraoral scan body (ISB) design is highly variable and its role in the digital workflow and accuracy of digital impressions is not well understood. PURPOSE: The purpose of this systematic review was to determine the relevant reports pertaining to ISBs with regard to design and accuracy and to describe their evolution and role in the digital dentistry workflow. Special attention was placed on their key features in relation to intraoral scanning technology and the digitization process...
April 5, 2018: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/29627208/influence-of-repeated-firings-on-marginal-axial-axio-occlusal-and-occlusal-fit-of-metal-ceramic-restorations-fabricated-with-different-techniques
#11
Özay Önöral, Mutahhar Ulusoy, Emre Seker, İlker Etikan
STATEMENT OF PROBLEM: Ill-fitting restorations can jeopardize dental, periodontal, and systemic health. Repeated ceramic firing may influence the fitting accuracy of restorations, but scientific information regarding this issue is lacking. PURPOSE: The purpose of this in vitro study was to assess and compare the influence of repeated firings on the marginal, axial, axio-occlusal, and occlusal fit of metal-ceramic 3-unit fixed partial dentures (FPDs) manufactured with different framework methods, including casting, fully sintered hard alloy milling (FHAM), presintered soft alloy milling (PSAM), and selective laser sintering (SLS)...
April 5, 2018: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/29622289/continuity-defects-of-the-mandible-comparison-of-three-techniques-for-osseous-reconstruction-and-their-impact-on-implant-loading
#12
Yunus Okcu, Jan Rustemeyer
Computer-aided design/manufacturing (CAD/CAM) is now widely used, but whether it can help to overcome complications in mandibular reconstruction and accelerate dental implantation is still a matter for debate. Therefore, we aimed to evaluate the benefits of this technique using vascularized iliac crest or fibula flaps in mandibular reconstruction, with respect to the time between reconstruction and implantation, and the ratio of planned to inserted implants. We reviewed retrospectively the records of 54 patients who underwent mandibular reconstructions between 2012 and 2016, and included in our study the last 10 cases representing each of the following groups: iliac crest flap with CAD/CAM (Group 1); fibula flap with CAD/CAM (Group 2); and fibula flap without CAD/CAM (Group 3)...
March 9, 2018: Journal of Cranio-maxillo-facial Surgery
https://www.readbyqxmd.com/read/29610779/evaluation-of-flexural-strength-and-surface-properties-of-prepolymerized-cad-cam-pmma-based-polymers-used-for-digital-3d-complete-dentures
#13
Mustafa Arslan, Sema Murat, Gulce Alp, Ali Zaimoglu
PURPOSE: The objectives of this in vitro study were to evaluate the flexural strength (FS), surface roughness (Ra), and hydrophobicity of polymethylmethacrylate (PMMA)-based computer-aided design/computer-aided manufacturing (CAD/CAM) polymers and to compare the properties of different CAD/CAM PMMA-based polymers with conventional heat-polymerized PMMA following thermal cycling. MATERIALS AND METHODS: Twenty rectangular-shaped specimens (64 × 10 × 3.3 mm) were fabricated from three CAD/CAM PMMA-based polymers (M-PM Disc [M], AvaDent Puck Disc [A], and Pink CAD/CAM Disc Polident [P], and one conventional heat-polymerized PMMA (Promolux [C]), according to ISO 20795-1:2013 standards...
2018: International Journal of Computerized Dentistry
https://www.readbyqxmd.com/read/29610778/testing-occlusal-performance-by-using-chewing-simulation-with-virtually-designed-substrate
#14
Andra Maria Pascale, Sebastian Ruge, Steffen Hauth, Bernd Kordaß, Lars Linsen
Physically accurate deformable models based on the finite element method (FEM) are being used for a wide range of applications, from entertainment to medicine. This article describes how we applied this method in the CAD/CAM area that is concerned with reconstructing 3D models of teeth. We simulated the process of mastication by employing a deformable model that represented the substrate, and a rigid model that represented the teeth. We extended a recent approach for substrate deformation by also modelling the fracture of the substrate by the mastication process...
2018: International Journal of Computerized Dentistry
https://www.readbyqxmd.com/read/29609139/mechanical-properties-and-superficial-characterization-of-a-milled-cad-cam-glass-fiber-post
#15
George Hebert Ruschel, Érica Alves Gomes, Yara Terezinha Silva-Sousa, Rafaela Giedra Pirondi Pinelli, Manoel Damião Sousa-Neto, Gabriel Kalil Rocha Pereira, Aloísio Oro Spazzin
Computer-aided design and computer-aided manufacturing (CAD-CAM) technology may be used to produce custom intraradicular posts, but studies are lacking. The purpose of this in vitro study was to evaluate the flexural properties (strength and modulus), failure mode, superficial morphology, and roughness of two CAD-CAM glass fiber posts (milled at different angulations) compared with a commercially available prefabricated glass fiber post. Three groups were tested (n = 10): PF (control group)- prefabricated glass fiber post; C-Cd-diagonally milled post; and C-Cv-vertically milled post...
March 27, 2018: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/29607869/fracture-resistance-force-of-primary-molar-crowns-milled-from-polymeric-computer-aided-design-computer-assisted-manufactured-resin-blocks
#16
A Mete, Y Yilmaz, S S Derelioglu
Purpose: To compare fracture resistance force (FRF) and failure types of crowns milled from resin nanoceramic (Lava Ultimate)-, and modified polymethylmethacrylate (PMMA) (Vita computer-aided design (CAD)-Temp)-, and PMMA (Telio CAD)-based CAD/computer-assisted manufactured (CAM) blocks. Materials and Methods: Three experimental groups of 10 milled crowns were arranged: Group-1 (Lava Ultimate), Group-2 (Vita CAD-Temp), and Group-3 (Telio CAD). Crowns were machined in sizes similar to a primary second molar stainless steel crown (SSC) and stored in water at 37°C for 30 days...
April 2018: Nigerian Journal of Clinical Practice
https://www.readbyqxmd.com/read/29607866/shear-bond-strength-of-a-novel-porcelain-repair-system-for-different-computer-aided-design-computer-assisted-manufacturing-ceramic-materials
#17
M Karcı, N Demir, M G Subaşı, M Gökkaya
Objectives: The purpose of this study was to compare the shear bond strength of a novel repair system, Nova Compo SF with Ceramic Repair, Ivoclar, to computer-aided design/computer-assisted manufacturing (CAD/CAM) restorative materials (IPS e.max CAD and Empress CAD). Materials and Methods: The specimens of each CAD/CAM restorative material were randomly divided into two subgroups of nine specimens, using one of two repair systems. All specimens were etched with hydrofluoric acid and rinsed under a water spray for 10 s, then air-dried for 10 s...
April 2018: Nigerian Journal of Clinical Practice
https://www.readbyqxmd.com/read/29607851/evaluation-of-the-fracture-resistance-of-computer-aided-design-computer-aided-manufacturing-monolithic-crowns-prepared-in-different-cement-thicknesses
#18
N Polat Sagsoz, N Yanıkoglu
Introduction: The purpose of this study was to evaluate the fracture resistance of monolithic computer-aided design/computer-aided manufacturing (CAD/CAM) crowns that are prepared with different cement thickness. Materials and Methods: For this investigation, a human maxillary premolar tooth was selected. Master model preparation was performed with a demand bur under water spray. Master die was taken to fabricate 105 epoxy resin replicas. The crowns were milled using a CEREC 4 CAD/CAM system (Software Version, 4...
April 2018: Nigerian Journal of Clinical Practice
https://www.readbyqxmd.com/read/29607321/influence-of-manufacturing-methods-of-implant-supported-crowns-on-external-and-internal-marginal-fit-a-micro-ct-analysis
#19
Izabela C M Moris, Silas Borges Monteiro, Raíssa Martins, Ricardo Faria Ribeiro, Erica A Gomes
Aim: To evaluate the influence of different manufacturing methods of single implant-supported metallic crowns on the internal and external marginal fit through computed microtomography. Methods: Forty external hexagon implants were divided into 4 groups ( n = 8), according to the manufacturing method: GC, conventional casting; GI, induction casting; GP, plasma casting; and GCAD, CAD/CAM machining. The crowns were attached to the implants with insertion torque of 30 N·cm...
2018: BioMed Research International
https://www.readbyqxmd.com/read/29605190/fracture-strength-testing-of-crowns-made-of-cad-cam-composite-resins
#20
Ryota Okada, Masaki Asakura, Akihiro Ando, Hirokazu Kumano, Seiji Ban, Tatsushi Kawai, Jun Takebe
PURPOSE: The purpose of this study was to ascertain whether computer aided design/computer aided manufacturing (CAD/CAM) composite resin crowns have sufficient strength to withstand the bite force of the molar teeth. The null hypothesis was that the fracture strength of CAD/CAM composite resin crowns is lower than the average maximum bite force of the molar tooth. METHODS: The crowns, which shape is the right maxillary first molar, were fabricated using four CAD/CAM blanks made of composite resins (Block HC: HC, KZR-CAD HR: HR, KZR-CAD HR2: HR2, Avencia Block: AVE) and one CAD/CAM blank made of lithium disilicate glass-ceramic (IPS e...
March 28, 2018: Journal of Prosthodontic Research
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