Chin point guidance group (CPG)
incisors
BITE
Two cotton rolls were placed over the occlusal surfaces of both mandibular first molars and the patient was instructed to bite down for ten minutes, thus preventing the teeth from occluding. CR was recorded using the three-fingered chin point guidance technique with an anterior jig. In brief, the dentist creates a tripod with the thumb, index and middle finger at the chin symphysis and the inferior borders of the mandible and guides the patient’s mandible into a thermoplastic impression material (GC Bite Compound) placed over the maxillary central incisors by applying gentle pressure to the chin area with the thumb. After hardening of the jig, reproducibility of the designated CR position was tested by repeating the closure movement around the hinge axis several times and assuring that the lower incisors met the indentations of the jig upon each guided closure. The CR position was then secured with a bite registration material (Regisil) as described above.