Application and Mechanism of CGF Composite Bone Scaffold Material in Extraction Site Preservation Surgery

INTERVENTION: Control group:Fill the extraction socket with deproteinized bovine bone mineral.;Trial group:Fill the extraction socket with deproteinized bovine bone mineral and CGF.; CONDITION: Periodontal Disease; Alveolar Bone Resorption; Tooth Extraction PRIMARY OUTCOME: Alveolar bone height;Alveolar bone width; INCLUSION CRITERIA: 1. Aged 18 to 65 years old; 2. Those who are unable to retain their teeth due to severe caries, periodontal disease, apical inflammation, trauma or tumors and are willing to undergo a delayed implant procedure; 3. Preoperative CBCT imaging showed the presence of 2 or more bone walls at the extraction site; 4. Patient compliance was good and there were no contraindications to extraction.