3급 부정교합자는 반대 교합, 하악 돌출의 구조적인 결함으 로 인해 조음 문제를 나타낼 수 있다(Lee & Kim, 1993; Yang, 1996). 이 중 유치열기 아동의 경우, 상하악의 발육 정도, 영구 치 맹출 시기, 하악의 폐구 양상, 하악의 전방 가능성이 성숙과 함께 변화하면서 저작, 연하 및 조음에 관여되는 구강운동의 기능이 전형성에서 벗어나게 되는 경우가 많아 말소리의 오조 음이 발생되기도 한다(Jung et al., 2015).
Purpose: The goal of this study is to examine the effect of articulation treatment using Oral Motor Training (OMT) on articulation accuracy and distortion errors of children who have speech sound disorders with class III malocclusion. Methods: Three children with class III malocclusion in the stage of deciduous dentition aged from 6;0-6;3 (year;month) participated in this study. These 3 children commonly exhibited unilateral mastication, mandible laterality on jaw movement and especially distortion errors of lateralizing for alveolar and palatal consonants mainly in vowel /i/ environment. Articulation therapy using OMT for both of improved non-speech and speech movement involved in target sound production was provided. The ABA design of single case experimental design was used. The articulation accuracy and the frequency of lateralization distortion errors at both of the word and sentence level were measured within baseline (A1), intervention (B), and maintenance (A2) phases. Results: It was found that all participants showed the higher articulation accuracy and the lower frequency of distorted lateralization errors for alveolar and palatal consonants at the both of word and sentence levels in intervention phases than in baseline ones and also these effects maintained after intervention. Conclusion: It was concluded that the OMT targeting appropriate non-speech and speech movement might be beneficial for young children who have class III malocclusion.
INTRODUCTION MATERIALS AND METHODS RESULTS DISCUSSIONS REFERENCES
