Wyniki wyszukiwania - BazTech

Ograniczanie wyników

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: CAD/CAM technologies

Sortuj według:

Ogranicz wyniki do:

Surface roughness analysis of prepolymerized CAD/CAM dental acrylic resins following combined surface treatments

Alfouzan Afnan, Alnouwaisar Alhanouf, Alazzam Njood, Al-Otaibi Hanan, Labban Nawaf, Alswaidan Mashaal, Al-Taweel Sara, Alshehri Huda

Materials Science Poland

2021

Vol. 39, No. 2

209--218

Oral dentures are subjected to mechanical and chemical cleansing processes. However, these processes alter the physical and mechanical properties of denture acrylic resins. This study analyzes the surface roughness of conventional heat-cured (HC) polymethacrylate, light-cured (LC) urethane dimethacrylate, and prepolymerized computer-aided design/computer-aided manufacturing (CAD/CAM) dental acrylic resins. The materials were subjected to combined surface treatment of mechanical brushing, thermal cycling, and immersion in chemical disinfectants (corega, chlorhexidine gluconate [CHG], and sodium hypochlorite) to simulate 1 year of clinical use. The surface roughness of the resin specimens before and after surface treatment was evaluated using a noncontact profilometer. Statistical tests based on analysis of variance revealed significant interactions between resin type and disinfectants, indicating that the effects of these two factors were interdependent. The highest and lowest surface roughness was observed in HC resins immersed in CHG and CAD/CAM resins immersed in sodium hypochlorite. Among the materials, HC resins demonstrated the overall highest mean roughness, followed by LC and CAD/CAM resins. Regarding the disinfectant use, the highest mean roughness was observed in disks immersed in CHG, followed by those immersed in corega and sodium hypochlorite. The prepolymerized CAD/CAM acrylic resin demonstrated superior surface quality following combined surface treatments. The HC and LC resins exceeded the roughness threshold and the reported roughness values for acrylic resins following surface treatments. Among the disinfectants tested, sodium hypochlorite produced overall low roughness values.

Wielowarstwowe strukturalne „skóry”. Beton-shotcrete jako komponent

Januszkiewicz K.

Archivolta

2014

nr 4

52--57

Beton jest materiałem kompozytowym złożonym głównie z wody, wypełniacza i cementu. Ludzkość stosowała beton od tysięcy lat. Przykładowo, do dziś przetrwały relikty struktur sprzed ośmiu tysięcy lat, świadczące o stosowaniu betonu w kulturze nabatejskiej. Jednakże rzymski Panteon jest wciąż największą kopułą z niezbrojonego betonu. Beton jest przyjazny dla środowiska we wszystkich stadiach swojego życia, dlatego chętnie jest stosowany w strukturach mających na uwadze zrównoważony rozwój.

The creative potential of digital media, together with manufacturing advances already attained in automotive and shipbuilding industries, are opening up new dimensions in architectural design. CAD CAM technologies create new opportunities by allowing the production and construction of complex which, until recently, were difficult to design and build using traditional construction technologies.