Andrea Coldea

Ludwig-Maximilians-University of Munich | LMU · Department of Prosthodontics

This study evaluated whether airborne-particle abrasion could be an alternative to hydrofluoric acid etching as a pretreatment for the adhesive bonding of silicate ceramic restorations. Feldspar (FEL; n = 100), lithium silicate (LiSi; n = 100), and zirconia (ZrO2; (n = 80) substrates were CAD/CAM-fabricated and airborne-particle-abraded with Al2O3...

This study aimed to evaluate the effect of ceramic type, firing tray, and firing substrate on the density, shrinkage, biaxial flexural strength, Martens' hardness, and elastic indentation modulus of zirconia veneering ceramics. Disk-shaped specimens were fabricated from a high-fusing (HFZ) and a low-fusing (STR) zirconia veneering ceramic. These sp...

Enossale Implantate gelten heute als ein Mittel der Wahl, um Zähne zu ersetzen und Funktion, Ästhetik sowie Lebensqualität des Patienten wiederherzustellen. Hierbei können diese als Halteelemente für herausnehmbaren oder als Pfeiler für festsitzenden Zahnersatz dienen. Dieser Artikel beleuchtet die physikalischen Eigenschaften implantatgetragener E...

The present investigation tested the effect of cleaning methods and adhesives on the tensile bond strength (TBS) of a resin-based composite luted to a temporary 3D printed resin. Substrates (n= 360) were printed using a Rapidshape D20II and cleaned with a butyldiglycol-based solution, isopropanol, or by centrifugation. Specimens were air-abraded wi...

Statement of problem: To complement the digital workflow for manufacturing fixed dental prostheses, both high-strength frameworks and esthetic veneers should be designed and fabricated digitally. However, how the fracture load of digitally veneered restorations compares with conventionally fabricated restorations is unclear. Purpose: The purpose...

Objective: Recently a polymer infiltrated hybrid ceramic was developed, which is characterized by a low elastic modulus and therefore may be considered as potential material for implant supported single crowns. The purpose of the study was to evaluate the loading capacity of hybrid ceramic single crowns on one-piece zirconia implants with respect...

Objectives: This paper investigates the structure and some properties of resin infiltrated ceramic network structure materials suitable for CAD/CAM dental restorative applications. Methods: Initially the basis of interpenetrating network materials is defined along with placing them into a materials science perspective. This involves identifying...

To analyze the damage tolerance of indirect restorative materials after grinding with diamond burs to simulate adjustments by clinicians and technicians. Seven commercially available restorative materials (Mark II, ENAMIC, In-Ceram Alumina, VM 9, In-Ceram YZ, IPS e.max CAD) and an experimental one (PICN) were analyzed. Forty bending bars per materi...

Objective: To analyze the effect of damaged surfaces of dental glass ceramics on flexural strength depending on the point in time of crystallization or glazing. Method: The following two materials went under investigation: VITA SUPRINITY (VITA Zahnfabrik, Bad Säckingen, Germany) and IPS e.max CAD (Ivoclar Vivadent, Schaan, Liechtenstein). Standar...

Objectives To determine the contact response and damage tolerance or strength degradation of a range of dental CAD/CAM ceramic materials including novel PICN (Polymer-Infiltrated-Ceramic-Network) materials by means of spherical indentations at various loads and indenter radii. Methods The seven tested materials included (Mark II, PICN test materia...

Objective: To analyze the contact response and damage modes of dental CAD/CAM ceramic materials upon spherical indentations at varying loads and indenter radii. Method: Standardized ISO 6872 bending bars of In-Ceram Alumina, VITA Mark II, VITA ENAMIC and an experimental polymer-infiltrated-ceramic-network (PICN) material (all VITA Zahnfabrik, Bad...

To determine the flexural strength and subsequent strength degradation of a range of dental CAD/CAM ceramic materials and novel PICN (Polymer-Infiltrated-Ceramic-Network) materials by means of pre-damaging with Vickers indentations at various loads. The materials tested included (Mark II, PICN test material 1 and 2, In-Ceram Alumina, VM 9, In-Ceram...

Objective: Hybrid ceramic (HC) is a polymer infiltrated ceramic network material. Contrary to commonly used dental ceramics and composites, HC consists of two interpenetrating networks. The aim of this study was to determine the correlation between flexural strength and polymer content of HC. Method: Feldspar ceramic powder was compressed into bl...

Objective: The aim of this study was to develop an appropriate procedure for preparation and measurement of bonded specimens to determine the influence of adhesive luting system on ceramic restoration shade and to analyze the influence of adhesive luting systems and clinically relevant restoration layer thickness on ceramic restoration shade. Met...

Objectives: To determine and identify correlations between flexural strength, strain at failure, elastic modulus and hardness versus ceramic network densities of a range of novel polymer-infiltrated-ceramic-network (PICN) materials. Methods: Four ceramic network densities ranging from 59% to 72% of theoretical density, resin infiltrated PICN as...

Y-TZP (Yttrium-teilstabilisiertes Zirkoniumdioxid) gilt in der restaurativen dentalen Prothetik als etabliert. In den meisten Fällen werden die Restaurationen in einer vergrößerten Form aus einem porösen Rohling geschliffen und anschließend auf ihre Enddichte und -größe gesintert. Systembedingt lassen sich in vielen Fällen abschließende manuelle Na...