چاپ صفحه |  صفحه نخست سامانه |  نویسندگان |  اطلاعات تفضیلی |  دانلود مقاله | دانشگاه علوم پزشکی تبریز |
| نویسنده | نفر چندم مقاله |
|---|---|
| فرهنگ محبوب | اول |
| عنوان | متن |
|---|---|
| خلاصه مقاله | Ceramics are widely used as indirect restorative materials in dentistry because of their high biocompatibility and pleasing aesthetics. The use of all ceramic restorations has become popular and many of these restorations can be fabricated by both traditional laboratory methods and CAD-CAM. The traditional methods of ceramic fabrication have been described to be time-consuming, technique sensitive and unpredictable due to the many variables and CAD-CAM may be a good alternative for both the dentists and laboratories because of its benefits in terms of time consuming, materials savings, standardization of the fabrication process, and predictability of the restorations. CAD-CAM was introduced as an industrial approach to manufacture the cores of the restorations in 1980s. Nowadays various types of ceramic materials can be used in CAD-CAM technology such as glass ceramics including feldspathic, mica-based, leucite-reinforced, lithium disilicate-reinforced, glass infiltrated alumina and zirconia ceramics and polycrystalline alumina and zirconia. These materials differ in composition, properties, processing methods and clinical indications, all of which work together when determining a material’s best use. For this reason, it is imperative that dentists understand the different classes of ceramic CAD/CAM available materials. Polycrystalline alumina and zirconia, have no intervening etchable glassy matrix and all the crystals are densely packed into regular arrays and then sintered. The dense crystal lattice reduces crack propagation resulting in excellent mechanical properties. However, at the same time, the increase in strength means that well-fitting prosthesis could not be practically fabricated without CAD-CAM systems. Polycrystalline ceramic is relatively opaque by nature and is indicated for the fabrication of crown and bridge copings upon which a veneering ceramic is layered for the required aesthetic result. Full contour zirconia’s lower alumina content gives it improved translucency, and makes it more appropriate as a monolithic material. Monolithic restorations are fabricated in a single process and are quickly becoming popular for use in the posterior region. None of the CAD-CAM ceramics exhibit ideal clinical properties for universal applications and this field is strongly evolving with evidence from materials development and from longer-term clinical studies. |
| کلمات کلیدی | CAD-CAM, ceramics, digital dentistry |
| نام فایل | تاریخ درج فایل | اندازه فایل | دانلود |
|---|---|---|---|
| mah1 001.jpg | 1398/11/26 | 767726 | دانلود |
| 19-1.pdf | 1398/12/11 | 235712 | دانلود |
| 126.pdf | 1398/12/11 | 202576 | دانلود |
