Research of Optical Properties and Biocompatibility in Different Zones of Multilayered Translucent Zirconia on Hydrothermal Aging.

Objective: We assessed the changes in optical properties and biocompatibility of transition zones in multilayered translucent monolithic zirconia exposed to prolonged hydrothermal aging and compared the results to those with different yttrium oxide contents.

Materials And Methods: Four types of zirconia blocks from IPS e.max ZirCAD were used: 3Y-TZP e.

Effects of ultraviolet weathering aging on the color stability and biocompatibility of various computer-aided design and computer-aided manufacturing glass-ceramic materials.

Objectives: This study assessed the changes in color stability and biocompatibility of computer-aided design and computer-aided manufacturing (CAD-CAM) glass-ceramics after ultraviolet weathering (UW) aging.

Methods: A total of 300 plate-shaped specimens (12.0 × 14.

The Effects of Thermocycling on the Physical Properties and Biocompatibilities of Various CAD/CAM Restorative Materials.

The purpose of this study is to evaluate the changes in physical properties and biocompatibilities caused by thermocycling of CAD/CAM restorative materials (lithium disilicate, zirconia reinforced lithium silicate, polymer-infiltrated ceramic network, resin nanoceramic, highly translucent zirconia). A total of 225 specimens were prepared (12.0 × 10.

Bonding of conventional provisional resin to 3D printed resin: the role of surface treatments and type of repair resins.

Purpose: This study evaluated the shear bond strength between 3D printed provisional resin and conventional provisional resin depending on type of conventional provisional resin and different surface treatments of 3D printed resin.

Materials And Methods: Ninety-six disc-shaped specimens (Ø14 mm × 20 mm thickness) were printed with resin for 3D printing (Nextdent C&B, Vertex-Dental B. V.

Effect of cyclic bend loading on a cobalt-chromium clasp fabricated by direct metal laser sintering.

Statement Of Problem: Limited information is available regarding the mechanical properties of a partial removable dental prosthesis clasp fabricated by direct metal laser sintering (DMLS).

Purpose: The purpose of this in vitro study was to measure the mechanical properties of cast clasps, DMLS clasps, and annealed DMLS clasps and to determine the correlation between cyclic bend loading, annealing, and mechanical properties.

Material And Methods: Sixty half round clasp specimens were fabricated, with a length of 20 mm and a diameter of 1.

Comparative study of new bone formation capability of zirconia bone graft material in rabbit calvarial.

Purpose: The purpose of this study was to compare the new bone formation capability of zirconia with those of other synthetic bone grafts.

Materials And Methods: Twelve rabbits were used and four 6-mm diameter transcortical defects were formed on each calvaria. Each defect was filled with Osteon II (Os), Tigran PTG (Ti), and zirconia (Zi) bone grafts.

Three-dimensional comparative study on the accuracy and reproducibility of dental casts fabricated by 3D printers.

Statement Of Problem: Studies investigating the precision of 3-dimensional (3D) printed casts for fixed prosthodontics are scarce.

Purpose: The purpose of this in vitro study was to compare the accuracy and reproducibility of dental casts made by the conventional method and by 3D printing.

Material And Methods: A master model was designed and fabricated with polyetherketoneketone.

The influence of the number and the type of magnetic attachment on the retention of mandibular mini implant overdenture.

Purpose: The aim of this study was to compare the retention of mini implant overdenture by the number, the type of magnetic attachment, and the directions of applied dislodging force.

Materials And Methods: The experimental groups were designed by the number and type of magnetic attachment. Twenty samples were tested with Magden implants.

Analysis of maxillofacial prosthetics at university dental hospitals in the capital region of Korea.

Purpose: The purpose of this study was to investigate the demographic patterns of maxillofacial prosthetic treatment to identify the characteristics and geographic distribution of patients with maxillofacial prosthetics in the capital region of Korea.

Materials And Methods: This retrospective analytical multicenter study was performed by chart reviews. This study included patients who visited the department of prosthodontics at four university dental hospitals for maxillofacial prosthetic rehabilitation.

Correlation between the size of the incisive papilla and the distance from the incisive papilla to the maxillary anterior teeth.

Background/purpose: The incisive papilla remains relatively constant in position and is frequently used as an anatomic landmark for anterior teeth. Several attempts have been made to use the incisive papilla as guides to arrange maxillary anterior teeth for edentulous patients. The aim of the present study was to determine the relationship between maxillary anterior teeth and the incisive papilla, while comparing the findings with the classical estimate value.

Changes in Elementary Student Perceptions of Science, Scientists and Science Careers after Participating in a Curricular Module on Health and Veterinary Science.

This study examined to what extent a curriculum module that uses animal and human health scientists and science concepts to portray science and scientists in a relevant and authentic manner could enhance elementary students' aspiration for science careers, attitudes to science, positive perceptions of scientists, and perceived relevance of science. The curriculum was developed by a research-based university program and has been put into practice in two early elementary classrooms in an urban school in the Midwest. An attitudinal rating survey and the Draw-A-Scientist Test (DAST) were used to assess pre to post changes in student attitudes toward science, perceptions of scientists, perceived relevance of science, and aspiration for science careers.

A comparative study on the bond strength of porcelain to the millingable Pd-Ag alloy.

Purpose: The porcelain fused to gold has been widely used as a restoration both with the natural esthetics of the porcelain and durability and marginal fit of metal casting. However, recently, due to the continuous rise in the price of gold, an interest towards materials to replace gold alloy is getting higher. This study compared the bond strength of porcelain to millingable palladium-silver (Pd-Ag) alloy, with that of 3 conventionally used metal-ceramic alloys.

Fat dogs and coughing horses: K-12 programming for veterinary workforce development.

Workforce development strategies to educate, inform, and diversify the veterinary profession of the future must begin with children in elementary school. This article provides a description of the Fat Dogs and Coughing Horses program, which takes a multifaceted approach toward informing young students, beginning in first grade, about the interesting work and career opportunities available in the field of veterinary medicine. The program, a collaboration among Purdue University and Indiana public schools, is supported by a Science Education Partnership Award from the Office of Research Infrastructure Programs, a component of the National Institutes of Health.

A comparison of retentive strength of implant cement depending on various methods of removing provisional cement from implant abutment.

Purpose: This study evaluated the effectiveness of various methods for removing provisional cement from implant abutments, and what effect these methods have on the retention of prosthesis during the definitive cementation.

Materials And Methods: Forty implant fixture analogues and abutments were embedded in resin blocks. Forty cast crowns were fabricated and divided into 4 groups each containing 10 implants.

Influence of the implant abutment types and the dynamic loading on initial screw loosening.

Purpose: This study examined the effects of the abutment types and dynamic loading on the stability of implant prostheses with three types of implant abutments prepared using different fabrication methods by measuring removal torque both before and after dynamic loading.

Materials And Methods: Three groups of abutments were produced using different types of fabrication methods; stock abutment, gold cast abutment, and CAD/CAM custom abutment. A customized jig was fabricated to apply the load at 30° to the long axis.

Influence of a microgrooved collar design on soft and hard tissue healing of immediate implantation in fresh extraction sites in dogs.

Objective: This study compared the alveolar bone reduction after immediate implantation using microgrooved and smooth collar implants in fresh extracted sockets.

Material And Methods: Four mongrel dogs were used in this study. The full buccal and lingual mucoperiosteal flaps were elevated and the third and fourth premolars of the mandible were removed.