The Influence of Implant Placement Angulation on Biomechanical Stability In Vitro Study

The angulation of dental implants significantly impacts their biomechanical stability, which plays a crucial role in the long-term success of implant therapy. This study aims to evaluate the influence of different implant angulations on primary stability through an in vitro analysis, providing insights into the optimal placement strategies for enhanced stability.

In this in vitro study, 30 implants were placed into standardized synthetic bone blocks to simulate Type 2 bone density. Implants were divided into three groups (n = 10) based on placement angulation: Group A (0° angulation), Group B (15° angulation), and Group C (30° angulation). Each implant was subjected to insertion torque (IT) measurement, and primary stability was evaluated using the implant stability quotient (ISQ) values obtained from a resonance frequency analyzer. The samples were subjected to cyclic loading at 100 N for 500,000 cycles to simulate masticatory forces.

The mean insertion torque values were 45 Ncm, 35 Ncm, and 25 Ncm for Groups A, B, and C, respectively. ISQ values at the time of placement were highest in Group A (75 ± 2), followed by Group B (68 ± 3) and Group C (60 ± 5). After cyclic loading, ISQ values decreased across all groups but remained significantly higher in Group A (73 ± 2) compared to Group B (65 ± 4) and Group C (57 ± 6). The statistical analysis revealed a significant difference (P < 0.05) in primary stability between the groups, indicating that increased angulation negatively affects biomechanical stability.

The findings of this in vitro study demonstrate that implant angulation has a significant influence on biomechanical stability. Implants placed at 0° angulation exhibited the highest primary stability, while angulations of 15° and 30° were associated with reduced stability. Clinicians should carefully consider implant angulation to optimize outcomes, particularly in cases with limited bone availability.