Tow Maxillary Hybrid Expanders Screw Supported Versus Lateral Angulated One; a Prospective Randomized Clinical Study

Comparison of Tow Maxillary Hybrid Expanders -Perpendicular Screw Supported Versus Lateral Angulated One; a Prospective Randomized Clinical Study

in this study i will use to different designs of t maxillary hybrid expanders that consists of HYREX supported with tow miniscrews to treat the collapsed maxilla in Yonge adolescents

the maxilla is expanded by tow diffrent designs of maxillary hybrid expanders

Inclusion Criteria:

1. Medically free male or female patients
2. Patients that necessitated maxillary expansion due to constricted maxillary arch shown by a unilateral or bilateral posterior crossbite.
3. The patient should have no missing teeth except third molars.
4. Age ranged from 12 to 18 years old.
5. The patient should have a good gingival condition.
6. The patient should have a good periodontal condition.

Exclusion Criteria:

1-hisory of previous orthodontic treatment. 2- Lack of cooperation. 3- Mental problems. 4- Skeletal open bite. 5- TMJ problem.

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