Reproducibility of maxillary cast mounting by 2 types of face bow transfers

An orientation relations were recorded to 20 dentulous subjects using 2 types of arbitrary face bows, one represented the ear bow, and the other represented the facia face bow, the maxillary cast was mounted on the articulator with every face bow transfer for the same patient. Results indicated that there were no reproducibility of the cast mounting positions. Statistical analysis cleared that the variations were significant

Effect of span length on the stresses induced in denture supporting structures [Finite element analysis]

When forces are applied on the midpoint of bounded saddle RPD case, whether the case in short or long span case, these force induces stress in the abutment teeth, its periodontal ligament, and the supporting bone. The induced stress showed maximum equivalent stress in certain area in the above mentioned structures. These areas seen very logic to get these greatest values. These areas are the cervical margin of the abutment tooth towards the residual ridge, the bone and mucosa close to the cervical margins, the periodontal ligament at apex of the root towards the residual ridge, also area at the midpoint of the pontic [RPD], and the metal just below this area, where the forces is applied. Maximum equivalent stress are higher in the abutment teeth of long span than of short span case, while they are lower in both the periodontal ligament and the supporting bone of the long span than of the short span cases