Temporary anchorage device (TAD) placement
Dental Procedures
estimated about CNY 2000-4500
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Description
A minimally invasive dental procedure involving insertion of a small titanium screw into alveolar bone to serve as an immovable anchor for orthodontic tooth movement.
Main Uses
Primary clinical use is to provide absolute skeletal anchorage for precise tooth movement in orthodontics—enabling en masse retraction, intrusion, extrusion, or rotation without relying on patient compliance or reciprocal anchorage. Common scenarios include: adult orthodontics with compromised periodontal support, bimaxillary protrusion requiring maximum anchorage, open-bite correction via maxillary molar intrusion, asymmetrical anchorage needs, and adjunctive use in orthognathic surgery preparation.
Normal Range
Not applicable — orthodontic mini-implants (micro-implants) are surgical devices, not laboratory tests; therefore, there are no quantitative 'normal ranges' or numerical biomarker values. Success is assessed clinically via stability (primary stability ≥ 20 Ncm insertion torque, secondary stability confirmed radiographically and functionally over 4–8 weeks), absence of mobility, peri-implant bone level maintenance, and lack of inflammation or infection.
Low Values - Possible Causes
1. Insufficient bone density or volume (e.g., thin alveolar ridge, low posterior mandible); 2. Inadequate insertion torque (<15–20 Ncm) leading to poor primary stability; 3. Excessive micromotion during early healing due to premature loading or patient noncompliance; 4. Localized infection or acute inflammation compromising osseointegration; 5. Improper placement angle or depth causing cortical perforation or soft-tissue impingement.
High Values - Possible Causes
1. Excessively high insertion torque (>35–40 Ncm) causing microfractures in cortical bone and subsequent necrosis; 2. Overloading due to aggressive orthodontic force application before adequate osseointegration (typically <6–8 weeks); 3. Placement in dense cortical bone without appropriate pilot drilling, increasing mechanical stress; 4. Systemic conditions promoting excessive bone formation (e.g., florid osseous dysplasia — rare but may impair remodeling); 5. Chronic low-grade peri-implant inflammation triggering reactive bone sclerosis (visible radiographically as increased peri-implant radiopacity).
estimated about CNY 2000-4500