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- Title
COMPARISON OF SPEECH ALTERATION ON WEARING OF HAWLEY'S AND VACUUM FORMED RETAINER: A RANDOMIZED CONTROLLED TRIAL.
- Authors
Naik, Harshit; Patel, Kalpesh; Desai, Hina; Iyengar, Shreya
- Abstract
Objectives: To investigate and compare the effect on speech alteration, in patients wearing Hawley's and vacuum formed retainers; by an objective acoustic analysis of vowels and consonants. Materials and methodology: 66 subjects were randomly divided by block randomization and 5 subjects were failed to follow up, therefore two groups were: [1] The Hawley's retainer (31 subjects) and [2] the vacuum formed retainer group (30 subjects). The subjects were instructed to pronounce vowels [a, e, i, o, u] and consonants [t, d, n, s, z, m, n, c, h, g] & recorded through microphone, at (i) Before wearing retainers [T0], (ii) Immediately after delivering retainers [T1], (iii) At 24 hours [T2], (iv) At 1 week [T3], (v) At 1 month [T4], and (vi) At 3 months [T5]. The recorded data were analysed later by using a frequency analysing software. Results: Statistically significant changes were observed with vowels (/i/, /u/) & consonants (/t/, /d/, /m/). In vacuum formed retainer group articulation of /i/, /u/, /t/, and /d/ were most affected (p<0.05); while in Hawley's retainer group /i/, /u/, /t/ and /m/ were significantly impaired (p<0.05). Conclusion: Sounds such as /i/, /u/, /t/, and /d/ for the Hawley's retainer group and /i/, /u/, /t/, /d/, and /m/ for vacuum formed retainer group showed significant alteration. A comparison of the HR group with the VFR group revealed that the changes in articulation were more significant in the Hawley's retainer group.
- Subjects
RANDOMIZED controlled trials; CONSONANTS; VOWELS
- Publication
Virtual Journal of Orthodontics, 2021, Vol 12, Issue 4, p3
- ISSN
1128-6547
- Publication type
Article