Publications by authors named "John Aarts"
Article Synopsis
- The study aimed to assess the wear resistance of three 3D-printed dental crown materials under varying conditions such as dry or artificial saliva environments, different loads, and surface treatments.
- Testing involved 120 specimens across 24 groups using a wear simulator to mimic 48 months of use, analyzing factors like wear loss, friction, and surface roughness.
- Results showed NextDent material had the most uniform wear and low loss, suggesting all tested materials are suitable for provisional use, with recommendations for including specific wear metrics in evaluations.
Article Synopsis
- The systematic review aimed to explore how various interventions affect the bond strength of additively manufactured crown materials after they are cemented.
- Six relevant studies were included, focusing on photopolymerized resin and one on 3D-printed zirconia, with most showing low risk of bias.
- Although there was no definitive best cement type found, alumina airborne-particle abrasion was generally recommended; further research is needed to better understand the clinical effectiveness of these crowns.
Objectives: This study aimed to investigate the effect of post-washing duration and crown thickness on the bond strength between additively manufactured crown materials and dental cement in vitro.
Methods: Rectangular-shaped specimens of two thicknesses (1.5 and 2.
Article Synopsis
- A systematic review was conducted to evaluate how various post-processing methods impact the accuracy of 3D-printed photopolymer crowns, highlighting the need for further research in this area.
- The review involved screening publications from databases like MEDLINE, Scopus, and Web of Science, ultimately analyzing 7 relevant studies focusing on factors such as material type and print settings.
- The findings indicated that improper washing times may negatively affect material properties, while different post-curing conditions do not significantly impact dimensional accuracy; thus, more research on inert post-processing mediums is suggested.
Article Synopsis
- This systematic review aimed to assess the accuracy of dental implant impressions using digitally coded healing abutments (CHAs) against conventional impression techniques.
- The review analyzed seven articles published between January 2010 and November 2022, focusing on the comparison of CHA impressions with conventional methods and examining variations in angulation and height within the CHA group.
- Results indicated that elastomeric impressions of CHAs were less accurate compared to conventional techniques, while intraoral scans of CHAs showed improved accuracy; further research is necessary before endorsing CHAs for all types of multiple implant restorations.
Statement Of Problem: Veneer preparation designs impact veneer accuracy. However, whether a modified design could reduce absolute margin discrepancy and marginal overhangs is unclear.
Purpose: The purpose of this in vitro study was to investigate whether a modified veneer preparation design enhances the absolute margin discrepancy and marginal overhang.
Statement Of Problem: More conservative restorative approaches have been advocated for nonvital anterior teeth as an alternative to complete coverage crowns to maximize the preservation of tooth structure. Systematic reviews that investigated factors influencing the success rate of porcelain veneers on endodontically treated anterior teeth are lacking.
Purpose: The purpose of this systematic review was to investigate factors influencing the success rate of porcelain veneers on endodontically treated anterior teeth.
Objectives: To investigate the heat generation on yttria-stabilized tetragonal zirconia polycrystalline (Y-TZP) crowns during polishing with coarse and fine polishing systems at various speeds.
Materials And Methods: Two polishers (coarse and fine) at three polishing speeds were investigated. Two simulation models of the first mandibular molars were prepared for full coverage Y-TZP restorations with different reduction dimensions.
Objectives: This study aims to systematically review the literature and evaluate the effect of post-printing factors such as aging, heat, appliance fabrication and storage on the dimensional accuracy of full-arch dental models manufactured by additive manufacturing (AM) technology for the intended use of working model purposes.
Materials And Methods: Three online databases, Medline (Ovid), Scopus and Web of Science were screened and last searched in March 2023. In-vitro studies and publications involving any distortions and shrinkage to the additively manufactured (AMed) model after printing and post-processing were included.
Objective: To investigate the fatigue behavior of cast and laser-sintered cobalt-chromium (CoCr) and polyetheretherketone (PEEK) material for a removable partial denture (RPD) clasps.
Methods: Dumbbell-shaped specimens were digitally designed with the center part of the dumbbell being a half-round shape at the cross-sectional dimension of 1.25 mm to simulate a typical clasp design and dimensions.
Purpose: To perform a systematic review that provides an overview of the current literature on fatigue behavior of removable partial denture (RPD) clasp materials based on different retentive areas.
Materials And Methods: The review followed the Preferred Reporting Items for Systematic Review and Meta-Analyses (PRISMA) guidelines. Electronic searches were done via PubMed, Scopus, and OVID for studies reporting on RPD clasps and the fatigue failure of clasp materials.
Evaluation of wear behaviour of various occlusal splint materials and manufacturing processes.
J Mech Behav Biomed Mater
February 2022
Objectives: To investigate the volumetric and vertical loss of occlusal splints manufactured by conventional (heat-cure), subtractive (CAD/CAM) and additive (3D-printing) methods.
Methods: Six occlusal splint materials were investigated (n = 126), using three manufacturing methods: heat-cured, CAD/CAM and 3D-printed built-in three different printing angles (0°,45°and 90°). Block-on-ring wear testing was performed with extracted human molars as the antagonist.
Aim: To evaluate efficacy and safety of Botulinum toxinA for improving esthetics in the facial complex and correlating them to the dosage and side effects through a systematic review.
Methods: A literature search was performed using PubMed, Medline, Web of Sciences, and Scopus databases. Quality of studies was appraised through the GRADE system.
Article Synopsis
- The study aimed to review various materials and methods used for wear testing of occlusal devices and their antagonists, both in laboratory settings (in vitro) and clinical settings (in vivo).
- A thorough electronic search identified 115 studies, from which 11 were selected for review, revealing that PEEK materials showed the least wear, while vacuum-formed devices experienced the most.
- The authors concluded that there's a need for standardized wear testing protocols due to inconsistencies in current methodologies, and emphasized the necessity of more clinical studies, particularly for 3D printed materials.
Comparison of hardness and polishability of various occlusal splint materials.
J Mech Behav Biomed Mater
March 2021
Objectives: To measure polishability of occlusal splint materials manufactured by various methods.
Methods: Seven occlusal splint materials manufactured by four different methods - Heat cured (Vertex Rapid simplified Clear), CAD-milled (Ceramill a-splint), Vacuum-formed (Proform splint) and 3D-printed (Freeprint Ortho, KeySplint Soft, DentaClear and FreePrint Splint 2.0) were tested for gloss, roughness, and surface hardness and elastic modulus.
Objective: This in-vitro study aims to study the stress distribution within the ceramic veneer-tooth system with two incisal preparation designs-butt joint (BJ) and feathered edge (FE), and to correlate these findings to the results of our previous published load-to-failure study.
Methods: Six photoelastic models were fabricated with an epoxy resin material (West System 105 Epoxy Resin/205 Fast Hardener, West System) to represent BJ and FE preparation configurations at 0° and 20° loading angulations. Lithium disilicate ceramic veneers (IPS e.
Statement Of Problem: Direct-metal laser-sintering (DMLS) technologies are being used to manufacture removable partial denture frameworks; however, the build parameters are not well documented.
Purpose: The purpose of this in vitro study was to investigate the impact of 3 different build angulations on a dental cobalt-chromium (Sint-Tech ST2724G) alloy by comparing the tensile properties and nanoindentation hardness. The null hypothesis was that no change would be found in the tensile properties of the different build angulation groups.
Objective: To determine patient satisfaction with esthetics, phonetics, and function following implant-supported fixed restorative treatment in the esthetic zone by measuring the Oral Health Related Quality of Life (OHRQoL).
Materials And Methods: This systematic review follows the "Preferred reporting items for systematic review and meta-analysis protocols" (PRISMA-P) 2015 statement. Studies were searched in the databases Ovid, PubMed, Web of Science, Scopus, and the Cochrane Library.
Objectives: This clinical study measured the change in opening and height of the displaced gingiva using paste and cord retraction materials for definitive impression making of natural teeth and assessed if they were comparable and clinically acceptable.
Methods: Impressions of 4 maxilla premolars from 10 participants were taken using a split-mouth protocol. All participants were free of periodontal disease, had a thick biotype, a minimal of 3 mm height of keratinized gingival tissue and gingival sulci depths of 2 mm.
Effect of incisal preparation design on load-to-failure of ceramic veneers.
J Esthet Restor Dent
June 2020
Objective: This in vitro study aims to evaluate load-to-failure of ceramic veneers with butt joint (BJ) and feathered edge (FE) incisal preparation designs, and to correlate these results to the failure mode of the restorations.
Materials And Methods: One hundred and forty-eight typodont teeth (customized Nissin A25A-UL19B) were divided into two different preparation configurations BJ and FE and two different loading angulations, 0° and 20°. Lithium disilicate ceramic veneers (IPS e.
Objective: To compare the bond strength of porcelain to enamel and dentin preparations finished with either ultrasonic instruments or diamond burs, with or without acid etching.
Materials And Methods: A total of 140 extracted bovine incisor teeth were divided into two groups, enamel and dentin. A split tooth model was employed: each tooth having a randomly allocated combination of diamond burs, ultrasonic instrument, etching, and no etching treatments on their labial surface.
Article Synopsis
- * Two types of preparations (sharp and round) were tested at angles of 33° and 22°, with results indicating that a 22° preparation significantly enhances strength under lateral loading, and that sharp angles weaken the ceramic.
- * Overall, the findings suggest that a 22° preparation is optimal for strength during lateral force application, while the shape of the preparation (sharp vs. rounded) greatly influences fracture strength when loads are applied to the cusp peak.
Background: The authors reviewed and identified the evidence for the various incisal preparation designs for ceramic veneers.
Types Of Studies Reviewed: The authors searched MEDLINE with PubMed and Ovid to identify any articles in the English language related to the topic up through March 2017 using a combination of key words: "porcelain veneer or ceramic veneer or dental veneer or labial veneer" AND "preparation," NOT "composite veneer," NOT "crown," NOT "implant," NOT "fixed partial denture or bridge or denture," NOT "porcelain-fused-to-metal," NOT "marginal gap or fit."
Results: In vitro studies showed that the palatal chamfer preparation design increases the risk of developing ceramic fractures.
Statement Of Problem: Although numerous gingival displacement materials are available, information is limited regarding the pressures that can atraumatically produce sufficient gingival displacement for a successful impression.
Purpose: The purpose of this in vitro study was to measure pressure and the resulting movement of artificial gingiva during simulated gingival displacement.
Material And Methods: An idealized tooth model was made from acrylic resin and polyvinyl siloxane to simulate the free gingiva, sulcus, and attachment.
Statement Of Problem: When implants are incorporated into an existing partial removable dental prosthesis, the acrylic resin base can fracture. It is therefore essential to study the mechanical behavior of partial removable dental prostheses by using stress and deformation analysis.
Purpose: The purpose of this study was to analyze the effect of the occlusal rest position on the implant-assisted partial removable dental prosthesis by finite element analysis.