# From Twin Blocks to Quad Blocks: A Two-Phase Approach to Class II Correction

## TL;DR

This paper presents a case study on using Twin Block and Quad Block appliances to correct a class II malocclusion in a growing patient.

## Contribution

A two-phase treatment approach using Twin Block followed by Quad Block is proposed for improved class II correction.

## Key findings

- Twin Block appliances effectively impact dentoalveolar structures in growing patients.
- Combining Twin Block with Quad Block improved occlusion refinement in a 12-year-old patient.
- Patient compliance is critical for successful treatment outcomes with these appliances.

## Abstract

Twin Block, a functional orthodontic appliance, has a major impact on the dentoalveolar structures with limited skeletal effects. In specific clinical scenarios, particularly in growing patients such as class II division 1 where the mandible is retropositioned, these appliances can effectively address the malocclusions. Patient compliance plays a crucial role in the success of these appliances, which also streamline subsequent phases of fixed appliance treatment. In the current case report, a Twin Block appliance followed by a Quad Block was given to a 12-year-old boy to refine the occlusion. The design and treatment outcomes of the appliance are discussed in this case study.