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J Dent Res Dent Clin Dent Prospects. 2025;19(1): 57-60.
doi: 10.34172/joddd.025.41445
  Abstract View: 11
  PDF Download: 10

Clinical Dentistry

Original Article

Comparison of dental effects of traditional and clear twin block: A randomized clinical trial

Ahmad Behroozian 1 ORCID logo, Anahita Pourahmad 2* ORCID logo, Mahsa Zali 3 ORCID logo, Amir Zandesh 2 ORCID logo

1 Department of Orthodontics, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran
2 Dental Student, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran
3 Department of Speech Therapy, School of Rehabilitation, Tehran University of Medical Sciences, Tehran, Iran
*Corresponding Author: Anahita Pourahmad, Email: pourahmad.anahita@gmail.com

Abstract

Background. Growth modification is a strategy for the treatment of skeletal Cl II patients. Clear twin block (CTB) is a modification of traditional twin block (TTB), which is made from thermoplastic sheets instead of acrylic resin and wire. This study compared the dental effects of the clear and TTBs.

Methods. In this randomized clinical trial, 60 growing skeletal Cl II patients with dental Cl II div 1 malocclusion were selected and randomly divided into two groups: TTB and CTB. Cephalometric radiography and stone models were taken before treatment (T1 ) and six months (T2 ) after appliance insertion. Data were analyzed using independent t-test and paired t-test at the 0.05 significance level.

Results. There was a significant difference between CTB and TTB in IMPA at T2 (P<0.05). Intragroup comparisons showed no significant change from T1 to T2 in the CTB group and for U1-SN and U1-Pal amounts in the TTB group. T1-T2 comparison showed a significant change in IMPA in the TTB group (P<0.05).

Conclusion. TTB showed more protrusion of lower incisors compared to CTB.


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Submitted: 22 Jun 2024
Revision: 05 Jul 2024
Accepted: 20 Oct 2024
ePublished: 31 Mar 2025
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