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PubMed1979

[The mandibular position and the masticatory surface complex in rehabilitations with total prostheses].

The construction principles for a complete denture were discussed in terms of the jaw relation and the masticatory surface complex with special reference to the conservation and preservation of the prosthetic support material. The habitual, neuromuscularly determined, position is recommended as a starting position of the mandible for the construction of this alignment; intraoral, central rod analysis of the support is helpful for the determination. When the lateral teeth are aligned, masticatory stability should be considered. The occluding surfaces therefore should be reduced, and the occlusal cusps determined according to the transversal interval of the crests for the maxilla and the mandible. In terms of the occlusion (articulation) concept, the biomechanical demands shold be determined on the basis of unobstructed sliding movements; a completely balanced occlusion seems to be the most advantageous in spite of certain disadvantages. The desired goal may be achieved with a unilaterally balanced occlusion. Based on previous experience, canine guidance as articulation concept has proved to be less suitable since symmetrical stress is unobtainable with at least one crest.

Biomechanical Phenomena↗
PubMed1985

Machinability of some dentin simulating materials.

Machinability in low speed drilling was investigated for pure aluminium, Frasaco teeth, ivory, plexiglass and human dentin. The investigation was performed in order to find a suitable test material for drilling experiments using paralleling instruments. A material simulating human dentin in terms of cuttability at low drilling speeds was sought. Tests were performed using a specially designed apparatus. Holes to a depth of 2 mm were drilled with a twist drill using a constant feeding force. The time required was registered. The machinability of the materials tested was determined by direct comparison of the drilling times. As regards cuttability, first aluminium and then ivory were found to resemble human dentin most closely. By comparing drilling time variances the homogeneity of the materials tested was estimated. Aluminium, Frasaco teeth and plexiglass demonstrated better homogeneity than ivory and human dentin.

Aluminum↗