Attachment and growth of human osteoblasts on different biomaterial surfaces.

Objectives: To prove the biocompatibility of biomaterials applied in biomedical devices, in vitro testing is crucial to render a material fit for medical application. The material of choice for dental implants is commercially pure titanium (cp-Ti), while other materials such as zirconia and polyetheretherketone (PEEK) are considered highly promising due to their functional and esthetic properties. The aim of this study was to determine whether PEEK with defined mean surface roughness and composition could achieve results equal to titanium or zirconia.

Effect of double conical abutment screw on implant preload.

Objective: This study compared the loosening torque of experimental double conical abutment screws to that of conventional conical abutment screws and flat-head screws in implants with internal connections before and after mechanical loading.

Material And Methods: Eighty implant-screw-abutment assemblies were divided into four groups: flat-head screw (Xive S), conical screw (Straumann), conical screw (Nobel Biocare), and double conical screw (RTB). Abutments were tightened to a torque of 30 Ncm.

Hybrid materials offer new perspectives.

Dental materials, especially in restorative dentistry, must not only be cost-effective, they must also meet many other requirements: biocompatibility, durability, excellent shade and light effects, abrasion resistance, hardness, mechanical strength under pressure, chemical resistance, surface density, ease of manufacture, and easy intraoral maintenance.

Influence of different conditioning methods on immediate and delayed dentin sealing.

Statement Of Problem: Data are needed to evaluate the effect of various conditioning methods on immediate and delayed dentin sealing.

Purpose: The purpose of this study was to test bond strength and surface configuration of immediate and delayed dentin sealing surfaces after applying different surface conditioning methods.

Material And Methods: A total of 96 premolars were allocated to the immediate and delayed groups.

All-ceramic restoration of zirconia two-piece implants--a randomized controlled clinical trial.

Objectives: Aim of this controlled prospective randomized study was to evaluate the outcome of two-piece zirconia implants compared to titanium implants over a period of up to 24 months.

Material And Methods: A total of 31 implants (16 zirconia/Ziterion vario Z(®) + 15 titanium/Ziterion vario T(®) ) were inserted primary stable (>30 Ncm) in the maxilla (7) and mandible (24) of 22 patients (13 male, nine female) requiring neither bone nor soft tissue augmentation. After a healing period of 6 months in the maxilla and 4 months in the mandible, ceramic abutments were luted adhesively to the zirconia implants and definitive all-ceramic restoration was performed with high-density ceramics.

Color stability of different composite resin materials.

Statement Of Problem: Data are needed to better predict the color stability of current composite resin materials.

Purpose: The purpose of this study was to evaluate the impact of different storage solutions on the color stability of different composite resin materials.

Material And Methods: Different restorative and adhesive composite resin specimens (dual-polymerizing self-adhesive resin cement, autopolymerizing resin-based composite resin, dual-polymerizing resin-based composite resin, nanohybrid composite resin, and microhybrid composite resin) were fabricated and stored in red wine, black tea, chlorhexidine, sodium fluoride, tea tree oil, or distilled water for 4 weeks at 37°C.

Reliability of nonretentive all-ceramic CAD/CAM overlays.

Intracoronal restorations have a variable risk of cusp fracture depending on the amount of tooth structure remaining. All-ceramic restorations with acusp-supporting design could be a long-lasting alternative. The aim of this study was to verify the clinical reliability of occlusal veneers.

Lava ultimate resin nano ceramic for CAD/ CAM: customization case study.

Lava Ultimate Resin Nano Ceramic (RNC) blocks are innovative new CAD/CAM materials that make it possible to achieve superior esthetic results in easy steps. The blocks are made of nano ceramic particles embedded in a highly cured resin matrix. Therefore, composite materials can be used to characterize and adjust resin nano ceramic restorations after milling.

Immediate provisional restoration of single-piece zirconia implants: a prospective case series - results after 24 months of clinical function.

Objective: Aim of this prospective case series was to evaluate the outcome of immediately provisionalized single-piece zirconia implants.

Material And Methods: A total of 20 zirconia implants were inserted in single-tooth gaps in the maxilla (11) and mandible (9) of 20 patients. Implants were restored with all-ceramic CAD/CAM provisionals without occlusal contacts immediately after placement.

Adhesive techniques and machineable high-performance polymer restorations for amelogenesis imperfecta in mixed dentition.

Amelogenesis imperfecta refers to a hereditary dysplasia of the enamel. As a result of various defects, qualitatively and/ or quantitatively abnormal enamel forms, while the dental structure remains normal. The following article describes the condition and presents the case of an 8-year-old boy who was dentally reconstructed both functionally and aesthetically using the adhesive technique and machinable high performance polymer restorations.

All-ceramic immediate restoration of one-piece zirconium dioxide implants.

The multipiece nature of different implant systems is problematic for a number of reasons. The greatest challenge is bacterial colonization of the implant and of the surrounding tissue, because of the implant/abutment and abutment/crown interfaces, as well as the micromovements of the individual components of the implant. A possibility of eliminating microgaps between the individual components of the implant on the one hand and avoiding micromovements on the other is described in this paper.

From the drilling template to the temporary restoration.

The temporary restoration of single-tooth gaps in the esthetically demanding anterior region represents a major challenge to the dentist and his/her team. The possibility of restoring single-tooth gaps after implantation is discussed in this paper, and we describe how a computer-milled drilling template made of composite can be converted with simple means into an esthetically attractive adhesive bridge.

Does gender and experience influence shade matching quality?

Objectives: To evaluate the influence of gender and level of experience on shade matching quality.

Methods: A study was simultaneously performed at 15 universities located in 9 countries. A total of 614 color normal participants completed all phases of the experiment.

Cone beam computerized tomography: basics for digital planning in oral surgery and implantology.

For the diagnosis of bone pathology, planning of complex implant-supported prosthetic restorations, and guaranteeing oral surgery that is as safe and free of complications as possible, a three-dimensional radiological display is frequently indicated. Cone beam computed tomography (CBCT), which can cover a large part of the indications of the dental and oral surgical spectrum, represents an alternative to computed tomography. Moreover, the method offers the advantage that it can also be used in the dental practice, taking the existing radiation protection regulations into account.

Biomechanical examination of inlay geometries--is there a basic biomechanical principle?

Purpose: In this in vitro study, all-ceramic inlays were subjected to a static strength test. The material used in this case was Vita Mark II ceramic (Vita-Zahnfabrik, Bad Säckingen, Germany). The goal of the study was to evaluate two different inlay preparations with differently designed ceramic inlays resulting from it, to determine which offered the greatest possible resistance in static fracture loading tests.

Oral status among seniors in nine nursing homes in Styria, Austria.

Objective: To investigate the oral state in participants cared for in residences for senior citizens in Styria, Austria.

Materials And Methods: Four hundred and nine participants in Styria from nine homes for senior citizens were examined employing parameters in accordance with those of Folstein's Mini Mental Status (MMS), DMFT, basic periodontal examination, the modified oral hygiene index, pain experienced during the preceding year, the subjective and objective need for treatment, and also requirements involving surgical and prosthetic treatment. Furthermore, the habitual methods of maintaining oral hygiene were examined establishing by whom this was carried out - whether by the patient, the nurse, or by patient and nurse together.

Comparison of the static loading capacity of all-ceramic bridge frameworks in posterior teeth using three hard core materials.

In this in vitro investigation, we studied the static strength of three-unit all-ceramic bridge frameworks with rigid positioning of the abutments. The materials used were Vita InCeram Alumina, Vita InCeram Zirkonia, and zirconium oxide (Vita InCeram (X YZ Cubes for Cerec). A finite element calculation was performed for numerical comparison of the load-bearing capacity of two main normal tensions.

Design of preparations for all-ceramic inlay materials.

Because of the developments in the field of all-ceramic materials, which have quite different material properties compared with traditional materials for prosthetic treatment, it was also important to adapt the preparation to the new circumstances. Practiced design guidelines for the restorative treatment of teeth for all-ceramic restoration are illustrated in this article. Based on traditional retentive preparation shapes, modifications of these geometries "designed for ceramics" were developed and postulated.

Milling precision and fitting accuracy of Cerec Scan milled restorations.

The milling accuracy of the Cerec Scan system was examined under standard practice conditions. For this purpose, one and the same 3D design similar to an inlay was milled 30 times from Vita Mark II ceramic blocks. Cylindrical diamond burs with 1.

PREPassistant: a system for evaluating tooth preparations.

Learning the widely differing forms of tooth preparation, especially in restorative dentistry, places high demands on both trainees and instructors with regard to precision, reproducibility, assessment, evaluation and three-dimensional conceptualization. In the past, evaluation of such preparations has been against subjective parameters and their interpretation by the assessor (usually the instructor). The use of CAD systems in teaching seminars and courses allows an objective assessment of tooth preparations and offers the trainee the possibility of measuring him/herself against a standard, of detecting errors, and of achieving perfection in the required tasks.

Minimizing movement of an orbital prosthesis retained by an obturator prosthesis.

This article describes a procedure in which an obturator with an integrated spring-loaded rewinding device retains an orbital prosthesis. This system minimizes movement of the orbital prosthesis during mastication and thus prevents adhesive failure.