Evaluation of Modified Hyrax Versus Quad Helix in Treatment of Posterior Cross Bite

A Comparative Evaluation of Modified Hyrax Versus Quad Helix in Treatment of Children With Posterior Cross Bite: Randomized Controlled Trial

This study will be performed to evaluate the treatment of posterior cross-bite with modified hyrax & Quad helix appliances and to compare which one will provide better results in relation to chewing difficulty in children with posterior cross- bite in mixed dentition

This study will be performed to evaluate the treatment of posterior cross-bite with modified hyrax & Quad helix appliances and to compare which one will provide better results in relation to chewing difficulty as a primary outcome of this study and also evaluate the increase in the inter maxillary width , sleep apnea and signs & symptoms of tempro-mandibular joints disorder in children with posterior cross- bite in mixed dentition Cases will be examined within a regular interval up to one year

Inclusion Criteria:

• Children with posterior cross-bite in mixed dentition stage.
• Children with normal and mild growth pattern.
• Children with completely erupted upper first molars.

Exclusion Criteria:

• Children with advanced periodontal diseases.
• Children having general diseases, syndromes.
• Children with previous orthodontic.
• Children with severe horizontal growth patterns.