2026 年 4 巻 1 号 p. 16-21
Purpose : Early remediation through oral myofunctional therapy (MFT) is crucial for children with oral myofunctional disorders (OMD), such as incompetent lip seals and tongue thrust. Using digital workflow to fabricate customised oral appliances is more convenient and efficient compared to traditional approaches ; however, using these appliances for improving oral function has not yet been explored. This study aimed to evaluate the clinical effectiveness of a novel 3D-printed custom-made splint-type orthodontic appliance for MFT to enhance oral muscle function and support children with OMD during growth and development.
Materials and methods : Patients diagnosed with OMD (9 boys, 13 girls ; age, 6-13 years ; mean age, 8.45 years) visiting the orthodontic department were included in the study. All patients underwent MFT ; 15 patients received appliance support (supported group) and 7 patients did not (control group). The appliances were made using a Class II national medical device-classified 3D printer. Treatment effectiveness was assessed via lip-closure strength (LCS), maximum tongue pressure (MTP), and lingual frenulum elongation rate, which were measured at baseline and 3 months after treatment.
Results : The MTP, LCS, and tongue frenulum elongation significantly increased in both the supported and control groups (p＜0.05) ; however, no significant differences were observed between the groups before and after treatment.
Conclusion : The 3D-printed custom-made splint-type orthodontic appliance has the potential to optimise tongue position and promote orofacial muscle harmony. The findings of this study provide an important foundation for the development of 3D-printed appliances to assist MFT and its clinical applications.
