73. Different methods for arranging artificial teeth for complete dentures. Cross-bite, prognathic, progenic arrangement.
Covers how artificial teeth are arranged in complete dentures when the jaws do not relate as normal Class I, namely prognathic (Class II) and progenic (Class III) relations and cross-bite. A table sets out the four jaw relations, and the note then gives separate arrangement steps for prognathic, progenic and cross-bite cases. It closes with general rules common to all arrangements, such as keeping teeth over the ridge crests and in the neutral zone, and checking phonetics and appearance at the try-in.
Topic 73 of 75 in the MU Sofia syllabus for Preclinics of Dental Prosthetics (Dental Medicine, Year 2). The free AceMed note covers it in 6 sections, about 340 words (3 min of reading), with 14 flashcards.
In this note
Introduction
Jaw relations
Prognathic (Class II) arrangement
Progenic (Class III) arrangement
Cross-bite arrangement of back teeth
Rules for every arrangement
Introduction
Gysi's orthognathic arrangement assumes jaws that relate normally (Angle Class I). Many edentulous patients don't: the jaws may relate as Class II or Class III, or resorption may make the lower arch wider than the upper. Then the teeth are arranged differently, always aiming for stability: teeth over the ridges, in the neutral zone, with balanced contacts.
Prognathic (Class II) arrangement
Upper front teeth set to support the lip, with a larger overjet than normal; don't push the lower teeth forward off the ridge.
Reduce the vertical overlap and flatten the guidance, so the dentures don't tip in protrusion.
Back teeth set in normal buccolingual relation, sometimes with an extra premolar in the upper or one fewer in the lower to fit the arch lengths.
Progenic (Class III) arrangement
Front teeth edge to edge, or with a slight reverse overlap, rather than forcing a normal overjet over unsupported ridges.
Lower front teeth set more lingually, upper ones more labially, within the limits of lip support and stability.
Back teeth often in cross-bite.
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