transverse malocclusion is very common in adult ,using conventional hyrax expander has many limitations and side effects, therefore ,recently A minis crews assisted rapid expansion is recently introduced to overcome hence complications

transverse malocclusion is very common in adult ,using conventional hyrax expander has many limitations and side effects such as buccal tipping, marginal bone loss, dento aloveolar expansion.

in such cases , surgically assisted rapid palatal expansion used to be the option of choice ,due to the invasiveness of the procedure and co-morbidity associated with it ,minis crews assisted rapid expansion is recently introduced to overcome the complications of both convectional and surgically assisted rapid palatal expansion

Inclusion Criteria:

• adults male or female aged from 18-30 years with skeletal Maxillary constriction
• unilateral or bilateral Dental posterior cross-bite
• mid-palatal suture maturation (Grade C, D) according to F Angileri classification
• good oral hygiene

Exclusion Criteria:

• no functional crossbite due to premature contacts
• no previous orthodontic treatment
• no buccal crossbite
• no craniofacial anomalies or syndromes.