CLINICAL TECHNIQUE
Conduct an intraoral visual examination of the partially edentulous mouth to identify the region of edentulous area and assess occlusal relation, orientation of occlusion plane, and incisal guidance ). Then, dry the opposing dentition and isolate the residual ridge of the edentulous area by evacuating saliva and displacing the cheek and the tongue. Next, extrude the fast setting vinyl polysiloxane (VPS) bite registration material (Regisil Rigid [DENTSPLY Caulk]) over the ridge between the buccal and lingual vestibules. Guide the mandible to relate against the opposing arch in the maximal intercuspal position and hold it until the material sets. Remove the processed VPS material out of the mouth, trim the excess, and return it to the mouth to verify its accuracy. Section the index either sagitally across the ridge at the site of interest, or longitudinally along the crest of ridge, using a surgical blade (No. 25 surgical blade [Miltex]). Finally, measure the thickness of the silicone index using either a ruler or periodontal probe and determine the sufficiency/insufficiency of the existing interarch distance to restore the missing dentition (). You may then show the index to the patient to enhance the understanding of the existing condition, extend further discussion on alternative treatment options, and to seek further consultation if needed
