Comparison of Two Types of Lingual Fixed Retainer Fabricated

Comparison of Two Types of Lingual Fixed Retainer (Metal and Fiber)Fabricated by Using (CAD\CAM)Technique

This study includes patients who have had previous orthodontic treatments (without tooth extraction) and who have good alignment of their lower incisors. Investigators will compare two types of lingual retainers made with CAD-CAM

This study includes patients who have had previous orthodontic treatments (without tooth extraction) and who have good alignment of their lower incisors. Investigator will compare two types of lingual retainers made with CAD-CAM by comparing them with the traditional lingual retainers according to the following groups:

1. Patients will be apply to them a lingual retainer made of fibers manufactured using CAD-CAM technology
2. Patients will be apply to them a lingual retainer made of metal made using CAD-CAM technology
3. Patients will be apply to them a conventional lingual retainer made of braided stainless steel wire (control group)

Inclusion Criteria:

• Patients with mixed dentition at age 14-24 years. They have a good alignment of the lower incisors.- Have good oral and periodontal health.-

Exclusion Criteria:

Patients who have a deep bite Patients who have previously used retainer Patients with poor oral care