Evaluation of the Effect of Crestal Placement Depths on Primary Implant Stability Using the Resonance Frequency Analysis Method: An Experimental Study on Fresh-Frozen Cadavers.

AIM: Dental implants are frequently utilized to restore function and aesthetics in cases where natural teeth have been lost due to periodontal disease, dental caries, or oral infections. Implants positioned below the crestal level (subcrestal) have been reported to demonstrate superior outcomes across multiple parameters compared with implants placed at the crestal level. However, the number of studies in the literature assessing the primary stability of subcrestally placed implants remains limited. The aim of this study is to evaluate the primary stability of implants placed at varying subcrestal depths and to provide a reference for future clinical research.

METHODS: This study was conducted at the Acibadem University Kozyataği Case Anatomy and Cadaver Laboratory. Ten fresh-frozen cadavers were utilized. Cadavers with bilateral edentulism in the premolar region were selected for the research. All implants are placed in the posterior mandible region. A total of 12 3.75 × 11.5 mm and 12 4.3 × 11.5 mm dental implants (Nuvo ConicalFIT, JJGC S.A., Curitiba, Brazil) were inserted. The implants were placed at the crestal level, 1 mm subcrestally, and 2 mm subcrestally. Platform creation with a profile drill was performed after 2 mm subcrestal placement. A total of 4 different stability measurements were collected. Primary stability was assessed at 3 points per implant, and the mean values were calculated.