In vitro evaluation of CAD/CAM composite materials.

Objectives: The purpose of this in vitro study was to evaluate the microstructural, elemental and mechanical properties of contemporary computer-aided-design/computer-aided manufacturing (CAD/CAM) resin based composite (RBC) materials.

Methods: Six CAD/CAM RBC materials [Brilliant CRIOS (Coltene Whaledent AG), Cerasmart (GC), Lava Ultimate (3M ESPE), Tetric CAD (Ivoclar Vivadent), Shofu Block HC (Shofu), Grandio Blocs (VOCO GmbH)] were tested. Ten rectangular blocks (14 Χ 12 Χ 18 mm) for each material, after metallographic grinding and polishing, were subjected to Instrumented Indentation Testing (ΙIT).

Effect of aging on color, gloss and surface roughness of CAD/CAM composite materials.

Objectives: To assess the effect of aging procedures on color, gloss and surface roughness of CAD/CAM composite materials.

Methods: 6 CAD/CAM composite materials (Brilliant CRIOS, Cerasmart, Lava Ultimate, Tetric CAD, Shofu Block HC, Grandio Blocs) were tested. 10 CAD/CAM fabricated specimens of each material polished according to manufacturers' recommendations, were subjected to one of the following aging procedures; immersion in coffee (30 days, 37C), water thermocycling (5000 cycles, 5-55 °C) and photoaging (150,000 kJ/m).

The current state of computer assisted orthognathic surgery: A narrative review.

Objectives: Since cone beam computed tomography (CBCT) became available, research in the field of computer assisted orthognathic surgery (CAOS) is constantly on the rising. It is the purpose of the present paper to describe the use of the available digital technology in the workflow of CAOS and to provide insight on the advantages and limitations arising from the use of both hardware and software.

Study Selection, Data And Sources: Systematic reviews, randomised controlled trials, prospective and retrospective clinical studies, case series and reports were consulted with search terms having been entered into PubMed, Google Scholar and the Cochrane database.

Effect of Staining Solutions on Color Stability, Gloss and Surface Roughness of Removable Partial Dental Prosthetic Polymers.

Purpose: To assess the effect of commonly used solutions on color stability, gloss, and surface roughness of removable partial dental prostheses polymers.

Materials And Methods: Discs (n = 112) were made of a poly(etheretherketone) (PEEK) polymer, a polyamide, an acetal resin and a heat-cured poly(methylmethacrylate) PMMA acrylic resin polished according to manufacturers' instructions. Seven specimens of each material were immersed in coffee, red wine, coca cola and distilled water for 30 days at 37 C.

The direct digital workflow in fixed implant prosthodontics: a narrative review.

Background: The purpose of this narrative review was to examine the applicability of IOS procedures regarding single and multiple fixed implant restorations. Clinical outcomes for monolithic zirconia and lithium disilicate restorations produced through a direct digital workflow were reported.

Methods: A MEDLINE (Pubmed) search of the relevant English-language literature spanning from January 1st 2015 until March 31st 2020 was conducted.

3D printed complete removable dental prostheses: a narrative review.

Background: The purpose of this paper is to review the available literature on three-dimensionally printed complete dentures in terms of novel biomaterials, fabrication techniques and workflow, clinical performance and patient satisfaction.

Methods: The methodology included applying a search strategy, defining inclusion and exclusion criteria, selecting studies and forming tables to summarize the results. Searches of PubMed, Scopus, and Embase databases were performed independently by two reviewers to gather literature published between 2010 and 2020.

Clinical and Patient-Reported Outcomes of Single Posterior Implant-Supported Restorations Completed by Predoctoral Students: A Retrospective Study with Up to 10 Years of Follow Up.

Purpose: To assess clinical outcomes of screw-retained implant-supported restorations as well as patient satisfaction and Oral Health-related Quality of Life (OHQoL), when treatment is performed in an academic setting by supervised predoctoral students.

Materials And Methods: Ninety patients (n = 129 restorations) consented to participate in the study. The mean follow-up period was 4.

The use of PEEK in digital prosthodontics: A narrative review.

Background: Advanced computer-aided design and computer-aided manufacturing (CAD-CAM) technology led to the introduction of an increasing number of machinable materials suitable for dental prostheses. One of these materials is polyetheretherketone (PEEK), a high performance polymer recently used in dentistry with favorable physical, mechanical and chemical properties. The purpose of this study was to review the current published literature on the use of PEEK for the fabrication of dental prostheses with CAD-CAM techniques.

Immediate loading of occluding definitive partial fixed prostheses vs non-occluding provisional restorations - 3-year post-loading results from a pragmatic multicentre randomised controlled trial.

Purpose: To compare the clinical outcome of dental implants restored with definitive occluding partial fixed prostheses within 1 week after implant placement with immediate non-occluding provisional restorations to be replaced by definitive prostheses after 4 months.

Materials And Methods: Forty partially edentulous patients treated with one to three dental implants, at least 8.5 mm long and 4.

Osseointegration of Dental Implants in a Patient with Hajdu-cheney Syndrome.

Background: Hajdu-Cheney Syndrome (HCS) is a rare hereditary bone metabolism disorder characterized by acro-osteolysis, short stature, craniofacial changes, periodontitis and premature tooth loss. Extensive search of the current literature revealed no reports of implant placement in patients with HCS.

Case Report: A 22-year old woman with osteoporosis, generalized advanced chronic periodontitis and premature tooth loss was referred to the Postgraduate Clinic of Periodontology, University of Athens-Greece.

Immediate occluding definitive partial fixed prosthesis versus non-occluding provisional restorations - 4-month post-loading results from a pragmatic multicenter randomised controlled trial.

Purpose: To compare the clinical outcome of dental implants restored with definitive occluding partial fixed prostheses within 1 week, after implant placement with immediate non-occluding provisional restorations, which were to be replaced by definitive prostheses after 4 months.

Materials And Methods: Fifty partially edentulous patients treated with one to three dental implants, at least 8.5 mm long and 4.

Composition, phase analysis, biaxial flexural strength, and fatigue of unshaded versus shaded Procera zirconia ceramic.

Statement Of The Problem: Recent interest in shaded zirconia has raised questions about the relative stability of the tetragonal phase after colorant oxide additions.

Purpose: The purpose of this in vitro study was to evaluate the effects of fatigue cycling on the stability of a commercially available dental zirconia (Procera) in both unshaded and shaded compositions by measuring the change in biaxial flexural strength (BFS) after 500 000 cycles at 80-N loads and in phase composition as detected by x-ray diffraction (XRD).

Material And Methods: Partially stabilized zirconia disks (NobelProcera) were fabricated in unshaded and shaded forms (12 mm diameter × 0.

Hardness Changes of Tissue Conditioners in Various Storage Media: An in Vitro Study.

The aim of the present study was to evaluate the effects of storage media on the longitudinal hardness changes of tissue conditioning materials. Four tissue-conditioning materials were used for fabrication of 80 disc-shaped specimens and divided in four groups, stored in four storage media. The specimens underwent artificial ageing corresponding to 30 nights of extra-oral storage.

Cyclic Loading Effect on Color Stability of Unshaded versus Shaded Zirconia.

Statement Of Problem: Shaded versions of dental zirconia may improve initial color matching to teeth, but might change color with cyclic mechanical loading.

Purpose: The purpose of this study was to measure the color of unshaded and shaded zirconia dental ceramic before and after cyclic mechanical loading and calculate color differences (ΔE).

Material And Methods: Disk-shaped specimens (N = 30, Nobel Procera, 0.

Matching repeatability and interdevice agreement of 2 intraoral spectrophotometers.

Statement Of Problem: The visual determination of tooth color with standard shade guides is a subjective method of color communication, depending on variables such as the light source, the operator, and the tooth. The assessment of tooth color may be improved by the use of special devices such as colorimeters or spectrophotometers. However, the repeatability and the interdevice agreement of these devices have not been thoroughly investigated.

Presentation of two cases of immediate restoration of implants in the esthetic region, using facilitate software and guides with stereolithographic model surgery prior to patient surgery.

Improvements in both implant microsurfaces and placement techniques have reduced healing time and increased survival rates. CAD/CAM technology and improved ceramic materials allow for achievement of improved esthetics at the implant restoration level. Two clinical procedures have the capacity to decrease patient postoperative discomfort and improve esthetics.

Prosthodontic treatment of a class IV ACP PDI patient, with Langerhans cell histiocytosis (LCH).

Langerhans cell histiocytosis (LCH) is a disease of unknown etiology with a frustrating and unpredictable course. Surviving adult patients suffering from the multisystem type of the disease present with problems in most organs. This article presents the oral rehabilitation of a 28-year-old patient, with multisystem sequelae that included the oral cavity, classifying him as a Class IV American College of Prosthodontists Prosthodontic Diagnostic Index patient.

Fabrication of a fixed provisional implant restoration. A report of three cases.

A clinical problem for patients with posterior partial edentulism who are going to be treated with dental implants is provisionalization during the period of soft and hard tissues preparation, the period of osseointegration and construction of the final restoration. Up to now, the available solutions were either the construction of a removable prosthesis or immediate loading of implants. The purpose of this article is to present an alternative technique for fabricating a fixed provisional restoration in patients with posterior partial edentulism.

Intrasurgical implant position transfer and interim restoration placement.

In the esthetic zone, the placement of an interim prosthesis is an important stage in implant treatment for gingival contouring. This article presents a simple procedure for making an intraoperative implant position transfer to construct an interim prosthesis with optimal shape and emergence profile. This prosthesis, inserted at stage II surgery, guides soft tissue healing and aids in the fabrication of a definitive prosthesis with optimal gingival contours.

Three-dimensional computerized stress analysis of commercially pure titanium and yttrium-partially stabilized zirconia implants.

Purpose: The purpose of this study was to use three-dimensional finite element analysis to analyze stress distribution patterns in Re-Implant implants made of commercially pure titanium (cpTi) and yttrium-partially stabilized zirconia (YPSZ).

Materials And Methods: Two three-dimensional finite element analysis models of a maxillary incisor with Re-Implant implants were made, surrounded by cortical and cancellous bone. A porcelain-fused-to-metal crown for the cpTi implant and a ceramic crown for the YPSZ implant were modeled.