Comparison of speech alteration on wearing of Hawley’s and vacuum formed retainer: A randomized controlled trial
Dr. Harshit Naik, Dr. Kalpesh Patel, Dr. Hina Desai, Dr. Shreya Iyengar
Academic degrees, and institutional affiliations and positions:
- MDS Orthodontics, Manubhai Patel Dental College & Hospital, Post graduate student
- MDSOrthodontics,ManubhaiPatelDentalCollege& Hospital, Professor
- MDSOrthodontics,ManubhaiPatelDentalCollege& Hospital, Head of the Department
- MDSOrthodontics,ManubhaiPatelDentalCollege& Hospital, Senior lecturer
The corresponding author’s address: Dr. Harshit Naik
B-66, Vrundavan Township, Near Swaminarayan Temple, Go- tri-Vasana Road, Gotri, Vadodara, Gujarat, India-390007
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:  The Hawley’s retainer (31 subjects) and  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.
Keywords: Speech alteration, Hawley’s retainer, vacuum formed retainer, Vowels, Consonants
POSTURA E OCCLUSIONE: CONSIDERAZIONI CLINICHE E TERAPEUTICHE parte seconda
LA RESPIRAZIONE NASALE
Body posture and occlusion: clinical and therapeutical considerations: second part, nasal breathing
MAZZOCCHI SUSANNA* MAZZOCCHI ALBERTO**
*Odontoiatra, libero professionista, Bergamo
**Specialista in chirurgia maxillo facciale, Bergamo
Address for correspondence:
Dr. Alberto Mazzocchi
PAROLE CHIAVE: respirazione orale, postura generale, apparecchi ortodontici funzionali
KEYWORDS: mouth breathing, body posture, functional orthodontic appliances
L’azione della respirazione orale sullo sviluppo delle ossa mascellari e delle arcate dentarie è un tema ancora dibattuto, anche se molti studi confermano che l’ostruzione delle vie nasali provoca una riduzione dello sviluppo del palato e una predisposizione al morso aperto e all’aumento dell’overjet. Gli Autori, in base alle loro evidenze cliniche, suggeriscono che la rieducazione alla respirazione orale, effettuata con l’uso notturno dell’equilibratore, avrebbe un effetto favorevole anche sul miglioramento della postura generale dei pazienti in crescita. Mediante l’uso costante di questo dispositivo ortodontico è possibile aiutare i pazienti a riprendere un corretto flusso di aria nasale, creando una espansione naturale delle arcate ma sviluppando anche una crescita armonica del torace e della colonna vertebrale. Questi dati confermano osservazioni riportate in letteratura sull’importanza del trattamento ortodontico funzionale precoce sulla corretta crescita dei piccoli pazienti.
The action of oral breathing on the development of the maxillary bones and dental arches is still a debated topic, although many studies confirm that the obstruction of the nasal airways causes a reduction in the development of the palate and a predisposition to open bite and increase of overjet.
Based on their clinical evidence, the Authors suggest that nasal breathing reeducation, performed by the nighttime use of the equilibrator, would also have a favorable effect on the improvement of the general posture of growing patients. Through the constant use of this orthodontic device it is possible to improve the correct flow of nasal air, creating a natural expansion of the dental arches and also developing a harmonious growth of the chest and spine. These data confirm observations reported in the literature on the importance of early functional orthodontic treatment for the correct growth of small patients.