removable retainer
Dental Procedures
estimated about CNY 1200-3500
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Description
A removable orthodontic appliance used post-treatment to maintain tooth position; examples include the Hawley retainer, Essix retainer, and vacuum-formed retainers.
Main Uses
Primary purpose is post-orthodontic retention to prevent dental relapse after active treatment; used during the stabilization phase (typically 6–12 months full-time, then nighttime-only for years); applicable for patients requiring adjustable retention (e.g., minor settling, growth monitoring), those with periodontal concerns needing easy hygiene access, and cases where fixed retainers are contraindicated; also employed for limited orthodontic adjustments (e.g., rotational settling, minor expansion) via activation.
Normal Range
Activity of removable orthodontic appliances (e.g., Hawley retainers) is not a quantitative laboratory test and has no numerical 'normal range'. Clinical assessment focuses on functional parameters: retention stability (no movement >0.5 mm during gentle finger pressure), passive fit (full seating without tissue impingement or gaps >0.2 mm), occlusal contact (even, non-interfering contacts in centric occlusion), and patient-reported comfort (no persistent soreness beyond first 2–3 days). These are qualitative/observational criteria, not numeric values.
Low Values - Possible Causes
Poor retention due to inadequate acrylic coverage or wire adaptation; relapse-induced ill-fitting caused by post-treatment tooth movement; thermally warped or distorted appliance from improper storage or cleaning; inaccurate impressions or model fabrication errors; excessive wear or material fatigue compromising structural integrity.
High Values - Possible Causes
Overly tight fit causing tissue compression or gingival blanching (indicating excessive force); premature occlusal contacts leading to unstable seating and perceived 'hyper-retention'; excessive acrylic bulk or wire engagement inducing discomfort and noncompliance; iatrogenic overcorrection during fabrication (e.g., over-extended labial bow); patient-related factors such as bruxism increasing perceived appliance resistance.
estimated about CNY 1200-3500