Effectiveness of combined design nance/transpalatal arch appliance in maintaining arch dimensions after premature extraction of primary molars (A randomized controlled clinical trial)

Abstract

INTRODUCTION: A combination of Nance and transpalatal arch space maintainers has previously been studied in treatment of Angle’s class II cases. However, this appliance hasn't been the subject of any trials as a space maintainer. AIM: To evaluate the effectiveness of the combined Nance/transpalatal arch (N-TPA) appliance compared to Nance space maintainer in maintaining arch dimensions after bilateral premature loss of maxillary primary molars. MATERIAL AND METHODS: Thirty children with bilateral premature loss of maxillary primary molars were randomly allocated into two groups (n=15). The test group received the N-TPA appliance, and the control group received the Nance appliance. Baseline measurements including arch circumference, intermolar width and arch depth were recorded. Participants were followed up to 9 months for re-evaluation. RESULTS: No statistical significance was found when comparing arch circumference, intermolar width and arch depth. Intra-group comparison of arch depth in the N-TPA group showed a statistical significance at 9 months. Comparison of difference in arch depth measurements from baseline to follow-up time points showed a statistical significance at 6 and 9 months. CONCLUSION: Both appliances provided acceptable space maintenance regarding arch circumference and arch width. Statistical significance was found when comparing arch depth measurements, however, further research is necessary to confirm clinical significance.