Читать книгу Fundamentals of Fixed Prosthodontics - James C. Kessler - Страница 79

The articulator is prepared to accept the casts by setting the inclination of the enclosed condylar track mechanisms at 30 degrees on each side (Fig 5-64). The Bennett angle ring for the progressive mandibular lateral translation should be set at 30 degrees (Fig 5-65).

Petrolatum is used to lubricate the surfaces of the upper and lower members of the articulator around the threaded mounting studs. Then a clean mounting plate is firmly secured to the mounting stud on the upper member of the articulator. A mounting guide or platform is attached to the lower member of the articulator. The thumbscrew on the front of the facebow is loosened, and the bite fork assembly is removed. The vertical transfer rod of the assembly is placed into the hole at the front of the mounting guide and secured by tightening the screw. The cast support is adjusted to touch the underside of the wax on the bite fork (Fig 5-66).

The maxillary cast is soaked in a plaster bowl, but the teeth should not be covered with water. The maxillary cast is carefully seated into the imprints in the baseplate wax on the bite fork. The upper member of the articulator is raised, and a golf ball–sized mound of thick, creamy mounting stone is placed on the base of the cast. The upper member of the articulator is swung down until the incisal pin is resting on the mounting guide or the anterior table, depending on the type of guide used. Stone must be engaging the cutouts in the top of the mounting plate. More stone is added if necessary, and the top is smoothed off with a spatula. When the stone has set completely, the bite fork assembly and mounting guide are removed from the articulator. All registration material is removed from the bite fork, which is then placed in a sealed sterilization bag and submitted for steam sterilization. A clean mounting plate is attached to the lower member of the articulator.