Implant Bed Preparation Techniques: A Comparative Study of Crestal Bone and Peri-Implant Soft Tissue Changes

Introduction: Crestal bone preservation and peri-implant soft tissue health are critical determinants of long-term dental implant success. The relaxed implant bed technique, involving delayed implant placement after osteotomy, has been proposed to enhance osseointegration and minimize surgical trauma. This randomized controlled clinical trial compared conventional implant placement with the relaxed implant bed technique regarding crestal bone levels and peri-implant soft tissue outcomes. Methodology: Thirty systemically healthy patients requiring mandibular posterior implants were randomly allocated into two groups (n=15 each): conventional implant placement and relaxed implant bed technique (implant placement 2 weeks after osteotomy). Titanium platform-switched implants were placed with insertion torque of 30–50 Ncm. Radiographic assessment of crestal bone levels was performed using cone-beam computed tomography (CBCT) and intraoral periapical radiographs (IOPAR). Clinical evaluation included probing depth, bleeding on probing, and modified plaque index. Patients were followed for 6 months after functional loading. Statistical analysis was performed using the Mann–Whitney U test with a significance level of 5%. Results: CBCT demonstrated no significant difference in crestal bone levels between the conventional and relaxed implant bed groups immediately after implant placement (p=0.077) or at 6 months (p=0.171). Similarly, IOPAR measurements showed no significant intergroup differences at any evaluation interval (p>0.05). Both groups exhibited progressive reductions in probing depth and bleeding index, while plaque scores remained comparable throughout follow-up. All implants survived, resulting in a 100% survival rate after 6 months. Conclusion: Both conventional and relaxed implant bed techniques produced comparable radiographic and clinical outcomes over a 6-month follow-up period. Although the conventional technique showed marginally less crestal bone loss, the difference was not statistically significant, indicating that both approaches are clinically effective for implant rehabilitation.