Due to increased inter-ridge distance in patients with resorbed alveolar ridges, tooth positioning becomes increasingly important in aiding the stability of dentures, so that the muscle activity of the attached and surrounding muscles imparts forces to stabilize rather than displace the dentures. Failure to recognize the importance of tooth position, flange form, and contour results in dentures which are unstable, howsoever, skillfully, they are constructed. Oral functions involve synergistic actions of tongue, lips, cheeks, and floor of the mouth, which are highly specific to an individual. Long-term edentulism as well as prolonged use of ill-fitting dentures result in severe resorption of the alveolar ridges, further, worsening this situation., Prosthodontic management of such compromised alveolar ridges requires specialized techniques starting from the impression procedure itself. Mandibular dentures often present greater difficulty in achieving retention, stability, and support than do maxillary dentures, primarily, due to a complex anatomy because of bone architecture and muscle attachments, and consequently, increased number of anatomic limitations.
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