PubMed · 354406
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W B Magness. 1978. The straight-wire concept.. https://doi.org/10.1016/0002-9416(78)90243-9
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A technique is described for the construction of a complete maxillary denture for a patient with extreme hard tissue undercuts. By means of a three-part impression procedure and buccolabial flanges that were hinged bilaterally with a central latch, a successful prosthesis was attained.
As shown in composite reconstructions made from optically-projected measurements of 10mu frontal maxillofacial sections of 20 histologically normal fetuses and embryos in the 70-255 mm CRL range, individual differences in relative tooth size and interdental spacing are evident by 10.5-11 weeks of gestation, and age-corrected crown-size correlations (r=0.40) approximate those in postnatal life. Despite an eight-fold increase in crown dimensions, interdental spacing remains approximately constant after 150 mm CRL, suggesting that the tooth organs or the periodontal membranes are able to maintain spacing, into the third trimester.
In orthodontics, occlusion should be considered from both the static and the dynamic viewpoints. The factors which determine adequate occlusion and articulation are described. It is furthermore shown how the orthodontist can incorporate those factors which he can control into the orthodontic treatment.