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.
Made in the USA. Door Construction. Wood doors consist of door frames constructed. from kiln-dried. 3â4â solid hardwood with mortise and tenon. joints and floating. center panels constructed of veneered or solid. wood. White. Thermofoil door styles are covered with.