Comparison of the effect of clear twin block and traditional twin block on speech: a randomized clinical trial.

Mohammad Rahim Shahbodaghi, Mahsa Zali, Ahmad Behroozian, Hooshang Dadgar
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Abstract

Objectives: To compare the effect of clear twin block (CTB) and traditional twin block (TTB) appliances on speech.

Materials and methods: In this randomized clinical trial, 18 skeletal Class II (Class II, division 1) growing patients were selected and randomly divided into CTB and TTB groups. Objective and semiobjective speech assessment tests were performed for vowel and consonant analyses at four time intervals: before (T0), immediately after (T1), 1 month after (T2), and 3 months after (T3) inserting the appliance. Data were analyzed using analysis of variance and independent t-test at the .05 significance level.

Results: Intergroup comparisons showed that the CTB group had less speech distortion immediately after insertion of the appliance (P < .05) than the TTB group; however, the differences were not significant at other time intervals. Intragroup comparisons showed that the number of distortions decreased significantly from T1 to T3 in both groups (P < .05). In contrast to CTB, the T0-T3 comparison was significant in the TTB group.

Conclusions: Although both appliances had some effects on speech, CTB had less speech distortion immediately after insertion, which is a very crucial moment in patient compliance. Additionally, articulation structures adapted to CTB faster than to TTB.

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比较透明双阻滞和传统双阻滞对言语的影响:随机临床试验。
目的比较透明双阻滞(CTB)和传统双阻滞(TTB)矫治器对言语的影响:在这项随机临床试验中,选取了 18 名骨骼生长 II 类(II 类,1 分部)患者,将其随机分为 CTB 组和 TTB 组。在四个时间间隔内进行客观和半客观语音评估测试,对元音和辅音进行分析:安装矫治器前(T0)、安装矫治器后(T1)、安装矫治器 1 个月后(T2)和安装矫治器 3 个月后(T3)。数据分析采用方差分析和独立 t 检验,显著性水平为 0.05:组间比较显示,CTB 组在佩戴矫治器后的言语失真程度(P < .05)低于 TTB 组,但在其他时间间隔内差异不显著。组内比较显示,从 T1 到 T3,两组的失真数量都明显减少(P < .05)。与 CTB 相比,TTB 组的 T0-T3 比较具有显著性:尽管两种矫治器都对言语有一定的影响,但 CTB 在插入后立即出现的言语失真较少,而这正是患者顺应性的关键时刻。此外,发音结构对 CTB 的适应快于 TTB。
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