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Title: Transverse dimensional changes following rapid maxillary expansion
Author: Cross, David Logan
Awarding Body: University of Edinburgh
Current Institution: University of Edinburgh
Date of Award: 1998
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The purpose of this study was to determine the effects of RME on skeletal, dental and nasal structures in a transverse plane and to relate these changes to nasal cavity function as determined by nasal airway resistance measurements. Twenty-five subjects exhibiting transverse maxillary dental deficiency were compared with 25 age and sex match controls. A number of skeletal, dental and nasal transverse widths and area measurements were selected and subjected to method error analysis. A nasal template was developed that allowed measurement of linear transverse widths and areas within the nasal cavity at different levels. As a result, six skeletal, five dental and seven nasal transverse widths and two nasal cavity area variables were measured and compared between the control group and the anomaly group before and after expansion with RME. Results indicate that there was little difference between the anomaly and control groups before treatment with the exception of maxillary skeletal and dental narrowness. Expansion using RME resulted in increased upper molar width, maxillary width, nasal cavity width and separation of the anterior nasal spine; however all patients did not respond uniformly. Whereas some patients demonstrated large increases in maxillary width, others experienced only moderate or little change. These differences may be related to the degree of ossification of the median palatine suture and to other aspects of maxillofacial maturity. Intranasal changes as a result of RME were restricted generally to the lower half of the nasal cavity and were highly variable, as were changes in nasal airway resistance. Twelve patients experienced improvements in either anterior NAR, posterior NAR or both. Five patients had little or no change in either resistance and only two patients experienced increases in both anterior and posterior NAR. Maxillary dental transverse deficiency was successfully treated in all cases at the end of the retention period.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (D.D.S.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available