Accuracy of Implant Placement for Patients With Mandibular Reconstruction Using Dynamic Navigation and Static Guides

Inclusion Criteria: * Male or female patients between the ages of 18 and 70 (inclusive) * Mandibular defects (including Class I defects, limited to the body of the mandible; Class II defects, muscular-mandibular region defects and Class III defects, chin protrusion-muscular-mandibular region defects), which have been reconstructed by mandibular vascularization of free iliac bone, and fibular composite muscular flap grafts for greater than 3 months * Normal mouth opening (≥ 40 mm) * Trialists voluntarily signed an informed consent form before performing any research-related experimental steps. Exclusion Criteria: * Presence of localized inflammation in adjacent teeth, including uncontrolled periodontitis (periodontal probing to a depth of \>4 mm) * Presence of untreated acute and chronic apical periodontitis in adjacent teeth * Oral mucosal lesions (e.g., lichen planus) * Adjacent teeth with space-occupying lesions (including cysts, tumors, etc.) * Systemic diseases affecting bone healing, wound healing and dental implant treatment (e.g., uncontrolled diabetes mellitus, fasting blood glucose ≥ 8.8 mmol/L despite medication) * Uncontrolled and unstabilized severe hypertension * Contraindications to routine implant surgery and oral surgery * Heart disease (Class II or above) * Patients with liver or kidney insufficiency or abnormality * Obese patients with body mass index (BMI) \> 28 kg/m2 * Patients with a history of full-dose radiotherapy, localized radiotherapy to the head or neck * Patients requiring long-term high-dose steroid therapy * Patients who are receiving or have received in the last 3 months medications (e.g., bisphosphonates) that may affect or promote bone metabolism * Consecutive antibiotic therapy or chronic anti-inflammatory therapy (≥3 times per week) within the first 4 weeks of starting the procedure * Alcohol or chronic substance abuse * Immunocompromised patients * Smoking/tobacco equivalents/chewing tobacco \>10 cigarettes per day * Physical or mental impairment that interferes with the performance of oral hygiene care * Female patients who are pregnant or breastfeeding * Patients who, in the opinion of the investigator, have poor compliance and cannot participate in the trial * Patients who have participated in a clinical trial of another drug or device within 30 days prior to the start of the procedure (Study Day 0)