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J Dent Res Dent Clin Dent Prospects. 2021;15(1): 59-65.
doi: 10.34172/joddd.2021.011
  Abstract View: 6
  PDF Download: 20

Prospective Highlight

Original Article

Skeletal and dental changes induced by the Flip-Lock Herbst appliance in the treatment of Angle’s class II division 1 malocclusion during active growth period: A preliminary study

Sushmitha R Iyer 1* ORCID logo, Premkumar Sridhar 2 ORCID logo, Mangaleswari Muruganandham 3 ORCID logo

1 Department of Orthodontics & Dentofacial Orthopaedics, Chettinad Dental College and Research Institute, Kancheepuram,
2 Department of Orthodontics & Dentofacial Orthopaedics, Tamil Nadu Government Dental College and Hospital, Chennai,
3 Directorate of Medical and Rural Health Services, Madhurandagam Government Hospital, Chengalpattu, Tamil Nadu, India

Abstract


Background. The Flip-Lock Herbst (TP Orthodontics Inc.) is a fixed functional appliance, a variant of the Herbst appliance, introduced by Miller. It is claimed to have better patient tolerance due to its increased freedom for the mandible’s lateral movements. There have been no studies on the flip lock Herbst till date. This study was undertaken to assess the efficiency of the Flip-Lock Herbst appliance in correcting Angle’s class II division 1 malocclusion.
Methods. Eight subjects in their active growth period with class II division 1 malocclusion due to a retrognathic mandible were included in the study. Standardized lateral cephalometric radiographs were used to evaluate skeletal and dental changes with the SO analysis. Paired samples t-test was used to assess statistical significance.
Results. Statistically significant increases in mandibular length (pg/OLp) and effective mandibular length (ar/OLp + pg/OLp) were observed. There was a significant maxillary restraining effect. Dental effects were significant and exhibited class II correction features except for the position of lower incisors within the mandible (ii/OLp - pg/OLp). Skeletal changes accounted for 61% and dental changes for 39% of the total treatment for molar correction. For overjet correction, skeletal changes contributed to 63% and dental changes to 37% of the total treatment.
Conclusion. The Flip-Lock Herbst appliance was efficient in correcting Angle’s class II division 1 malocclusion due to a retrognathic mandible. Both skeletal and dental changes were evident, with the former predominating (60:40).

Keywords: Class II, Functional treatment, Herbst appliance
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Submitted: 26 Jul 2020
Revision: 08 Oct 2020
Accepted: 09 Oct 2020
ePublished: 29 Jan 2021
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