To determine and compare the position of neutral zone in relation to crest of mandibular alveolar ridge with different duration of edentulousness: A clinico-radiographic study.

At the left molar region, 60% of the subjects showed lingual positioning of the neutral zone in Group I, and the percentage increased to 80% in Group II and 93.3% in Group III, which is highly significant ( P = 0.002) [ Table 4 ].

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On analyzing the results, the position of the neutral zone with different periods of edentulousness in the anterior region [ Table 8 ] showed a trend of normal physiological process where the mandibular anterior alveolar ridges are resorbed centrifugally.

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