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ORIGINAL RESEARCH
Year : 2016  |  Volume : 8  |  Issue : 9  |  Page : 916-921

A Clinico-radiographic Evaluation of Relation between Neutral Zone and Crest of Residual Alveolar Ridge with Different Duration of Edentulousness


1 Assistant Professor, Department of Prosthodontics, Pandit Deendayal Upadhyay Dental College & Hospital, Solapur, Maharashtra, India
2 Professor and Head, Department of Prosthodontics, Pandit Deendayal Upadhyay Dental College & Hospital, Solapur, Maharashtra, India
3 Professor, Department of Prosthodontics, Pandit Deendayal Upadhyay Dental College & Hospital, Solapur, Maharashtra, India
4 Postgraduate Student, Department of Prosthodontics, Pandit Deendayal Upadhyay Dental College & Hospital, Solapur, Maharashtra, India

Correspondence Address:
Jitendra J Mete
Department of Prosthodontics, Pandit Deendayal Upadhyay Dental College & Hospital, Solapur, Maharashtra, India

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Source of Support: None, Conflict of Interest: None


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Background: The location of neutral zone in relation to crest of ridge varies from individual to individual depending on the duration of edentulousness. The aim of this study was to determine and to compare the position of neutral zone in relation to crest of mandibular residual alveolar ridge with different duration of edentulousness. Materials and Methods: A total of 60 completely edentulous subjects were selected as subject for the study and were divided into three groups (20 in each group), depending on their duration of edentulousness - Group I: Edentulous for 6 months to 2 years, Group II: Edentulous for 2-5 years, and Group III: Edentulous for more than 5 years. Neutral zone was functionally recorded using impression compound at the predetermined vertical dimension of occlusion. Two different gauge wires were adapted and stabilized on the crest of residual alveolar ridge of mandibular cast and the center of neutral zone record rim. Occlusal radiographs were taken of each cast with the neutral zone record rim. Radiographs were studied for the buccolingual relation of the neutral zone and the crest of residual alveolar ridge, depicted by different gauge wires, in anterior, premolar and molar region. The data obtained was subjected to statistical analysis using the Kruskal-Wallis H-test. Results: Mean lingual shift of neutral zone with respect to center of crest of the alveolar ridge in mandibular right molar region is −0.8, −2.05, and −3.60 mm for Groups I, II, and III, respectively. The mean lingual shift of neutral zone with respect to center of crest of the alveolar ridge in mandibular left molar region is −0.9, −1.90 mm, and −3.30 mm for Groups I, II, and III, respectively. Mean labial shift of neutral zone with respect to center of crest of the alveolar ridge in mandibular anterior region is 1.95, 2.95, and 4.65 mm for Groups I, II, and III, respectively. Conclusion: With increase in duration of edentulousness, there is a more lingual positioning of neutral zone in relation to crest of residual alveolar ridge in mandibular molar regions, more labial positioning of the neutral zone with respect to crest of the residual alveolar ridge in mandibular anterior region.


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