Page 13 - Directions for the manipulation of the Gysi adaptable articulator

has been unsuccessful because the wax ridges took the pressure un- evenly and the thin ridge of tissue in the front of the mouth is unduly compressed during bite taking. 111. No. 6. It is important that the trial plates be so formed as to take the pressure evenly at all parts. The lower trial plate here shown is improperly formed on one side and will not take pressure evenly. This uneven pressure may so derange the compression of the tissues that the dentures will be unsuccess- ful in service. It will not stay compressed under the dentures and It estab- lished relations of one denture with the other which the dentist never Intended and which defeat the object of their use. The occlusal surface of the lower wax rim is now softened by heat, the trial plate quickly replaced in the mouth, and the upper closed down upon It. The pressure of the upper on the lower should be continued until the jaws come close enough together so that the lips touch lightly without effort, as in Illustration No. 7. The lower may then be trimmed free of excess wax. The trial plates are then of the right combined heights. It should be noted, upon removing the trial plates, whether the pressure is alike on both sides of the lower. Occasionally a lower trial plate will be tilted up on one side, which leads to disaster with the finished dentures.