Evaluation of Marginal Bone Level Changes Around Microthreaded Platform Switched Implant in The Aesthetic Zone

Abstract

Aim: This study was designed to evaluate marginal bone level change around microthreaded platform switched implant in the aesthetic zone. Subjects and methods: Eighteen implant fixture were inserted in 16 patients with missing single tooth in upper anterior area and divided equally into two groups. The patients were selected from those attending outpatient clinic, Oral and Maxillofacial Surgery Department, at the Faculty of Dental Medicine, Boys, Cairo, Al-Azhar University. Clinical examination was made to all patients as: Inspection and palpation of muscles of mastication, tempromandibular joint , lymph nodes, occlusion, condition of the existing teeth and oral mucosa and available inter arch space. Preoperative periapical radiograph as well as, cone beam CT radiograghy for evaluation of the implant site. The patients were assessed clinically at the operative day and post-operatively for 6 months to evaluate implant stability with osstell, Probing depth (PD) and PES/WES score. Marginal bone loss was measured 6 months post-operatively using CBCT radiography. Results: The mean value of vertical bone loss after 6 months was 0.52± 0.15 in group I and 0.92± 0.26 in group II . This bone loss was increased in group II more than group I with statistical significant difference. The mean value of PES/WES total was 13.44± 1.81 in group II and 15.67±1.66 in Group I. This value was decreased in group II more than group I with statistical significant difference. Conclusion: The use of micro threads on the implant neck with platform switch was most effective design to maintain and preserve marginal bone level.