Semi-adjustable articulator with mounted casts. An articulator is a mechanical device used in dentistry to which casts of the maxillary (upper) and mandibular (lower) teeth are fixed, reproducing recorded positions of the mandible in relation to the maxilla.
The Greek scholar Heron of Alexandria created the earliest known automatic door in the 1st century AD during the era of Roman Egypt. The first foot-sensor-activated automatic door was made in China during the reign of Emperor Yang of Sui (r. 604â618), who had one installed for his royal library.
Chicago Door Experts. Your Chicago door is made locally and will put a welcoming touch on the exterior of your home. The front doors are well-sealed for draft protection, and their durable frames keep your family safe.You can personalize the doors inside your home too with WindowWorks.Our Chicago door expert will consider the look and feel youâd like and create a front door that fits that! An endless selection of Chicago doors is available at WindowWorks.ou can personalize the doors inside your home too with WindowWorks. Our Chicago door expert will consider the look and feel youâd like and create a front door that fits that! An endless selection of Chicago doors is available at WindowWorks.