Comparative study on the qualities of dentures fabricated by neutral zone concept and conventional method in atrophic mandibular ridges

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Aein Mon
Yi Yi Soe
Than Swe

Abstract

The unstable mandibular complete denture is usually associated with an atrophic ridge, where the prosthetic rehabilitation of a patient is the most challenging for a prosthodontist. One of the methods used to solve this problem is neutral zone concept. Artificial teeth and denture base should be in proper position within the neutral zone where the displacing forces of the lips, cheeks, and tongue are in balance. The aim of this study is to compare tooth positions, the qualities of dentures such as retention, stability and patient satisfaction between dentures fabricated by neutral zone concept (neutral zone denture) and conventional method (conventional denture). Fourteen completely edentulous patients with moderate to severely resorbed ridges were selected. Two dentures were constructed using different methods: one by neutral zone impression making and the other by conventional mean. Tooth positions of both dentures were determined by measuring the distance between radiographic images of two wires which were adapted along the crest of the ridges and lingual fossae of the anterior teeth and central fossae of the posterior teeth by using a digital slide caliper. The retention and stability of each denture were measured by using a Push-Pull Gauge at the time of denture delivery. Patient satisfaction with mandibular dentures was assessed by Modified Smith’s Questionnaire method after two weeks. The results showed that tooth positions of neutral zone dentures were not as far away from the crest of the ridge as that of conventional dentures in all regions (anterior, left and right premolars, and left and right molars) and there were significant in left premolar, right premolar and right molar regions (p<0.05). Neutral zone dentures were significantly more retentive, stable and higher scores of patient satisfaction than conventional dentures (p<0.05). Application of neutral zone concept and neutral zone impression making is crucial in mandibular complete denture construction for atrophic ridges.

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How to Cite
Mon, A., Soe, Y. Y., & Swe, T. (2021). Comparative study on the qualities of dentures fabricated by neutral zone concept and conventional method in atrophic mandibular ridges. Myanmar Dental Journal, 27(1), 45–53. Retrieved from http://mda-journals.com/index.php/mdj/article/view/11
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Original Research