Morphological and functional evaluation in patients with mandibular retrognathism treated with the Neville Bass device

Abstract

Background: In Cuba there are insufficient studies on mandibular retrognathism treatment with devices which maintain the mandible in anterior position by means of the extension of lingual elements to a superior acrylic plaque.

Objective: To evaluate the morphologic and functional changes in patients with mandibular retrognathism treated with the Neville Bass device.

Methodology: An open experimental design with historical control was used in the Orthodontic Service of the Sancti Spíritus Provincial Stomatological Clinic, between January 2018 and February 2019. 20 patients who fulfilled the inclusion criteria were selected in the study group, and 20 were taken from a historical control group. In both groups, sex, age, morphological-clinical, morphological-cephalometric and functional variables were evaluated. Empirical level and statistical-mathematical methods were used.

Results: After one year of treatment, the mean values of overrun and underrun showed a progressive reduction in both groups and an increase in the maxillary transverse width. An increase in the values of jaw position, mandibular length, soft facial angle and soft facial angle was noted and Ricketts area 1 that improved the maxillary-mandibular relationship. In both groups, lateral mandibular movements increased, protrusive movements decreased and 90% of the patients adapted to the device.

Conclusions: At the end of the treatment period with the Neville Bass device, favorable changes were obtained in most of the morphological and functional variables evaluated, in a similar manner to those treated with the California bionator.