A Modification of the Quad Helix: The "Bi Helix".

Area of Science:

• Orthodontics
• Pediatric Dentistry

Background:

• The quad helix appliance is recognized for treating posterior crossbites in children with maxillary deficiency.
• Modifications to the quad helix have been explored for treating unilateral crossbites resulting from unilateral maxillary deficiency.

Observation:

• An 8-year-old female patient presented with a unilateral posterior crossbite and maxillary arch asymmetry.
• A novel modified quad helix, named the "bi helix," was employed for treatment.
• Maxillary asymmetry was quantified using a unique measurement technique on the dental cast.

Findings:

• The modified quad helix appliance successfully corrected the unilateral posterior crossbite within 30 days.
• A Nance palatal arch was utilized for space maintenance and retention post-correction.

Implications:

• This study introduces the "bi helix," a modification of the quad helix, for treating unilateral posterior crossbite.
• A new method for measuring maxillary asymmetry in pediatric patients is presented.
• The findings suggest a potentially faster and effective treatment for specific pediatric orthodontic conditions.