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Journal of Advanced Prosthodontics

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https://www.readbyqxmd.com/read/30370031/digital-evaluation-of-axial-displacement-by-implant-abutment-connection-type-an-in-vitro-study
#1
Sung-Jun Kim, KeunBaDa Son, Kyu-Bok Lee
PURPOSE: To measure axial displacement of different implant-abutment connection types and materials during screw tightening at the recommended torque by using a contact scanner for two-dimensional (2D) and three-dimensional (3D) analyses. MATERIALS AND METHODS: Twenty models of missing mandibular left second premolars were 3D-printed and implant fixtures were placed at the same position by using a surgical guide. External and internal fixtures were used. Three implant-abutment internal connection (INT) types and one implant-abutment external connection (EXT) type were prepared...
October 2018: Journal of Advanced Prosthodontics
https://www.readbyqxmd.com/read/30370030/influence-of-abutment-height-and-convergence-angle-on-the-retrievability-of-cement-retained-implant-prostheses-with-a-lingual-slot
#2
Kyu-Hyung Choi, KeunBaDa Son, Du-Hyeong Lee, Kyu-Bok Lee
PURPOSE: Cement-retained implant prostheses can lack proper retrievability during repair, and residual cement can cause peri-implantitis. The purpose of this in vitro study was to evaluate the influence of abutment height and convergence angle on the retrievability of cement-retained implant prostheses with lingual slots, known as retrievable cement-type slots (RCS). MATERIALS AND METHODS: We fabricated six types of titanium abutments (10 of each type) with two different heights (4 mm and 6 mm), three different convergence angles (8°, 10°, and 12°), a sloped shoulder margin (0...
October 2018: Journal of Advanced Prosthodontics
https://www.readbyqxmd.com/read/30370029/effect-of-liners-and-primers-on-tensile-bond-strength-between-zirconia-and-resin-based-luting-agent
#3
Eun-Hye Jo, Yoon-Hyuk Huh, Kyung-Ho Ko, Chan-Jin Park, Lee-Ra Cho
PURPOSE: The effect of silica-based glass-ceramic liners on the tensile bond strength between zirconia and resin-based luting agent was evaluated and compared with the effect of 10-methacryloyloxydecyl dihydrogen phosphate (MDP)-containing primers. MATERIALS AND METHODS: Titanium abutments and zirconia crowns (n = 60) were fabricated, and the adhesive surfaces of the specimens were treated by airborne-particle abrasion. The specimens were divided into 5 groups based on surface treatment: a control group, 2 primer groups (MP: Monobond Plus; ZP: Z Prime Plus), and 2 liner groups (PL: P-containing Liner; PFL: P-free Liner)...
October 2018: Journal of Advanced Prosthodontics
https://www.readbyqxmd.com/read/30370028/evaluation-of-the-marginal-and-internal-fit-of-a-single-crown-fabricated-based-on-a-three-dimensional-printed-model
#4
Yeon Jang, Ji-Young Sim, Jong-Kyoung Park, Woong-Chul Kim, Hae-Young Kim, Ji-Hwan Kim
PURPOSE: To evaluate the fit of a crown produced based on a 3D printed model and to investigate its clinical applicability. MATERIALS AND METHODS: A master die was fabricated with epoxy. Stone dies were fabricated from conventional impressions (Conventional stone die group: CS, n=10). Digital virtual dies were fabricated by making digital impressions (Digital Virtual die group: VD, n=10). 3D data obtained from the digital impression was used to fabricate 3D printed models (DLP die group: DD, n=10, PolyJet die group: PD, n=10)...
October 2018: Journal of Advanced Prosthodontics
https://www.readbyqxmd.com/read/30370027/effects-of-relining-materials-on-the-flexural-strength-of-relined-thermoplastic-denture-base-resins
#5
Yunhan Sun, So-Yeon Song, Ki-Sun Lee, Jin-Hong Park, Jae-Jun Ryu, Jeong-Yol Lee
PURPOSE: The aim of this study was to evaluate the effects of relining materials on the flexural strength of relined thermoplastic denture base resins (TDBRs). MATERIALS AND METHODS: For shear bond strength testing, 120 specimens were fabricated using four TDBRs (EstheShot-Bright, Acrytone, Valplast, Weldenz) that were bonded with three autopolymerizing denture relining resins (ADRRs: Vertex Self-Curing, Tokuyama Rebase, Ufi Gel Hard) with a bond area of 6.0 mm in diameter and were assigned to each group (n=10)...
October 2018: Journal of Advanced Prosthodontics
https://www.readbyqxmd.com/read/30370026/accuracy-of-provisional-crowns-made-using-stereolithography-apparatus-and-subtractive-technique
#6
Seen-Young Kang, Jung-Hyun Park, Ji-Hwan Kim, Woong-Chul Kim
PURPOSE: To compare and analyze trueness and precision of provisional crowns made using stereolithography apparatus and subtractive technology. MATERIALS AND METHODS: Digital impressions were made using a master model and an intraoral scanner and the crowns were designed with CAD software; in total, 22 crowns were produced. After superimposing CAD design data and scan data using a 3D program, quantitative and qualitative data were obtained for analysis of trueness and precision...
October 2018: Journal of Advanced Prosthodontics
https://www.readbyqxmd.com/read/30370025/evaluation-of-marginal-discrepancy-of-pressable-ceramic-veneer-fabricated-using-cad-cam-system-additive-and-subtractive-manufacturing
#7
Seen-Young Kang, Ha-Na Lee, Ji-Hwan Kim, Woong-Chul Kim
PURPOSE: The purpose of this study was to evaluate the marginal discrepancy of heat-pressed ceramic veneers manufactured using a CAD/CAM system. MATERIALS AND METHODS: The ceramic veneers for the abutment of a maxillary left central incisor were designed using a CAD/CAM software program. Ten veneers using a micro-stereolithography apparatus (AM group), ten veneers using a five-axis milling machine (SM group), and ten veneers using a traditional free-hand wax technique (TW group) were prepared according to the respective manufacturing method...
October 2018: Journal of Advanced Prosthodontics
https://www.readbyqxmd.com/read/30370024/shear-bond-strength-of-luting-cements-to-fixed-superstructure-metal-surfaces-under-various-seating-forces
#8
Fusun Ozer, Elif Pak-Tunc, Nesrin Esen Dagli, Deepika Ramachandran, Deniz Sen, Markus Bernhard Blatz
PURPOSE: In this study, the shear bond strengths (SBS) of luting cements to fixed superstructure metal surfaces under various seating forces were investigated. MATERIALS AND METHODS: Seven different cements [Polycarboxylate (PCC), Glass-Ionomer (GIC), Zinc phospahate (ZPC), Self-adhesive resin (RXU), Resin (C&B), and Temporary cements ((RXT) and (TCS))] were bonded to a total number of 224 square blocks (5×5×3 mm) made of one pure metal [Titanium (CP Ti) and two metal alloys [Gold-Platinum (Au-Pt) and Cobalt-Chrome (Co-Cr)] under 10 N and 50 N seating forces...
October 2018: Journal of Advanced Prosthodontics
https://www.readbyqxmd.com/read/30370023/trueness-and-precision-of-scanning-abutment-impressions-and-stone-models-according-to-dental-cad-cam-evaluation-standards
#9
Jin-Hun Jeon, Seong-Sig Hwang, Ji-Hwan Kim, Woong-Chul Kim
PURPOSE: The purpose of the present study was to compare scanning trueness and precision between an abutment impression and a stone model according to dental computer-aided design/computer-aided manufacturing (CAD/CAM) evaluation standards. MATERIALS AND METHODS: To evaluate trueness, the abutment impression and stone model were scanned to obtain the first 3-dimensional (3-D) stereolithography (STL) file. Next, the abutment impression or stone model was removed from the scanner and re-fixed on the table; scanning was then repeated so that 11 files were obtained for each scan type...
October 2018: Journal of Advanced Prosthodontics
https://www.readbyqxmd.com/read/30140401/evaluation-of-the-reproducibility-of-various-abutments-using-a-blue-light-model-scanner
#10
Dong-Yeon Kim, Kyung-Eun Lee, Jin-Hun Jeon, Ji-Hwan Kim, Woong-Chul Kim
PURPOSE: To evaluate the reproducibility of scan-based abutments using a blue light model scanner. MATERIALS AND METHODS: A wax cast abutment die was fabricated, and a silicone impression was prepared using a silicone material. Nine study dies were constructed using the prepared duplicable silicone, and the first was used as a reference. These dies were classified into three groups and scanned using a blue light model scanner. The first three-dimensional (3D) data set was obtained by scanning eight dies separately in the first group...
August 2018: Journal of Advanced Prosthodontics
https://www.readbyqxmd.com/read/30140400/a-study-on-the-machining-accuracy-of-dental-digital-method-focusing-on-dental-inlay
#11
Eun-Jeong Bae, Il-Do Jeong, Woong-Chul Kim, Ji-Hwan Kim
PURPOSE: The purpose of this study was to compare the cutting method and the lamination method to investigate whether the CAD data of the proposed inlay shape are machined correctly. MATERIALS AND METHODS: The Mesial-Occlusal shape of the inlay was modeled by changing the stereolithography (STL). Each group used SLS (metal powder) or SLA (photocurable resin) in the additive method, and wax or zirconia in the subtractive method (n=10 per group, total n=40). Three-dimensional (3D) analysis program (Geomagic Control X inspection software; 3D systems) was used for the alignment and analysis...
August 2018: Journal of Advanced Prosthodontics
https://www.readbyqxmd.com/read/30140399/polish-of-interface-areas-between-zirconia-silicate-ceramic-and-composite-with-diamond-containing-systems
#12
Philipp-Cornelius Pott, Johannes Philipp Hoffmann, Meike Stiesch, Michael Eisenburger
PURPOSE: Fractures, occlusal adjustments, or marginal corrections after removing excess composite cements result in rough surfaces of all-ceramic FPDs. These have to be polished to prevent damage of the surrounding tissues. The aim of this study was to evaluate the roughness of zirconia, silicate-ceramic, and composite after polish with different systems for intraoral use. MATERIALS AND METHODS: Each set of 50 plates was made of zirconia, silicate-ceramic, and composite...
August 2018: Journal of Advanced Prosthodontics
https://www.readbyqxmd.com/read/30140398/influence-of-nonthermal-argon-plasma-on-the-shear-bond-strength-between-zirconia-and-different-adhesives-and-luting-composites-after-artificial-aging
#13
Philipp-Cornelius Pott, Timo-Sebastian Syväri, Meike Stiesch, Michael Eisenburger
PURPOSE: Plasma activation of hydrophobic zirconia surfaces might be suitable to improve the bond strength of luting materials. The aim of this study was to analyze the influence of nonthermal argon-plasma on the shear bond strength (SBS) between zirconia and different combinations of 10-MDP adhesive systems and luting composites after artificial aging. MATERIALS AND METHODS: Two hundred forty Y-TZP specimens were ground automatically with 165 µm grit and water cooling...
August 2018: Journal of Advanced Prosthodontics
https://www.readbyqxmd.com/read/30140397/-in-vitro-performance-and-fracture-resistance-of-novel-cad-cam-ceramic-molar-crowns-loaded-on-implants-and-human-teeth
#14
Verena Preis, Sebastian Hahnel, Michael Behr, Martin Rosentritt
PURPOSE: To investigate the fatigue and fracture resistance of computer-aided design and computer-aided manufacturing (CAD/CAM) ceramic molar crowns on dental implants and human teeth. MATERIALS AND METHODS: Molar crowns (n=48; n=8/group) were fabricated of a lithium-disilicate-strengthened lithium aluminosilicate glass ceramic (N). Surfaces were polished (P) or glazed (G). Crowns were tested on human teeth (T) and implant-abutment analogues (I) simulating a chairside (C, crown bonded to abutment) or labside (L, screw channel) procedure for implant groups...
August 2018: Journal of Advanced Prosthodontics
https://www.readbyqxmd.com/read/30140396/the-effect-of-light-sources-and-cad-cam-monolithic-blocks-on-degree-of-conversion-of-cement
#15
Aydan Boztuna Çetindemir, Bülent Şermet, Değer Öngül
PURPOSE: To assess the degree of conversion (DC) and light irradiance delivered to light-cured and dual-cured cements by application of different light sources through various types of monolithic computer-aided design and computer-aided manufacturing (CAD/CAM) materials. MATERIALS AND METHODS: RelyX Ultimate Clicker light-cured and dual-cured resin cement specimens with 1.5-mm thicknesses (n=300, 10/group), were placed under four types of crystalline core structure (Vita Enamic, Vita Suprinity, GC Ceresmart, Degudent Prettau Anterior)...
August 2018: Journal of Advanced Prosthodontics
https://www.readbyqxmd.com/read/30140395/influence-of-the-amount-of-tooth-surface-preparation-on-the-shear-bond-strength-of-zirconia-cantilever-single-retainer-resin-bonded-fixed-partial-denture
#16
Charles-Ellie Sillam, Sibel Cetik, Thai Hoang Ha, Ramin Atash
PURPOSE: Conventional resin-bonded fixed partial dentures (RBFPDs) are usually made with a two-retainer design. Unlike conventional RBFPDs, cantilever resin-bonded fixed partial dentures (Cantilever RBFPDs) are, for their part, made with a single-retainer design. The aim of this study was to compare the effect of tooth surface preparation on the bond strength of zirconia cantilever single-retainer RBFPDs. The objective is to evaluate the shear bond strength of these single-retainer RBFPDs bonded on 3 different amount of tooth surface preparation...
August 2018: Journal of Advanced Prosthodontics
https://www.readbyqxmd.com/read/30140394/the-accuracy-of-a-3d-printing-surgical-guide-determined-by-cbct-and-model-analysis
#17
Boyoung Ma, Taeseok Park, Inkon Chun, Kwidug Yun
PURPOSE: The aim of this clinical study was to assess the accuracy of the implants placed using a universal digital surgical guide. MATERIALS AND METHODS: Among 17 patients, 28 posterior implants were included in this study. The digital image of the soft tissue acquired from cast scan and hard tissue from CBCT have been superimposed and planned the location, length, diameter of the implant fixture. Then digital surgical guides were created using 3D printer. Each of angle deviations, coronal, apical, depth deviations of planned and actually placed implants were calculated using CBCT scans and casts...
August 2018: Journal of Advanced Prosthodontics
https://www.readbyqxmd.com/read/30140393/surface-deterioration-of-monolithic-cad-cam-restorative-materials-after-artificial-abrasive-toothbrushing
#18
Nazmiye Şen, Betül Tuncelli, Gültekin Göller
PURPOSE: The purpose of this in vitro study was to evaluate the effect of abrasive toothbrushing on the surface properties of monolithic computer-assisted design and computer-assisted manufacturing (CAD/CAM) materials stored in food-simulating liquids (FSLs). MATERIALS AND METHODS: Fourty-eight disk-shaped test specimens of each material (Paradigm MZ100/PMZ, Lava Ultimate/LU, Vita Enamic/VE, and Vita Mark II/VMII) with a diameter of 10.0 mm and a thickness of 3...
August 2018: Journal of Advanced Prosthodontics
https://www.readbyqxmd.com/read/30140392/accuracy-of-new-implant-impression-technique-using-dual-arch-tray-and-bite-impression-coping
#19
Shin-Eon Lee, Sung-Eun Yang, Cheol-Won Lee, Won-Sup Lee, Su Young Lee
PURPOSE: The purpose of this in vitro study was to evaluate the accuracy of a new implant impression technique using bite impression coping and a dual arch tray. MATERIALS AND METHODS: Two implant fixtures were placed on maxillary left second premolar and first molar area in dentoform model. The model with two fixtures was used as the reference. The impression was divided into 2 groups, n=10 each. In group 1, heavy/light body silicone impression was made with pick up impression copings and open tray...
August 2018: Journal of Advanced Prosthodontics
https://www.readbyqxmd.com/read/30140391/the-effect-of-zirconia-surface-architecturing-technique-on-the-zirconia-veneer-interfacial-bond-strength
#20
Soo-Bok Her, Kyoung Hun Kim, Sang Eun Park, Eun-Jin Park
PURPOSE: The purpose of this study was to evaluate the effect of the zirconia surface architecturing technique (ZSAT) on the bond strength between veneering porcelain and zirconia ceramic. MATERIALS AND METHODS: 20 sintered zirconia ceramic specimens were used to determine the optimal surface treatment time, and were randomly divided into 4 groups based on treatment times of 0, 1, 2, and 3 hours. After etching with a special solution, the surface was observed under scanning electron microscope, and then the porcelain was veneered for scratch testing...
August 2018: Journal of Advanced Prosthodontics
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