Bone level changes at axial- and non-axial-positioned implants supporting fixed partial dentures. A 5-year...

Area of Science:

• Dental Implantology
• Periodontology
• Prosthodontics

Background:

• Marginal bone loss around dental implants is a key concern in implant dentistry.
• Understanding factors influencing bone stability is crucial for long-term implant success.
• Fixed partial dentures (FPDs) supported by implants require careful consideration of implant positioning.

Purpose of the Study:

• To investigate the relationship between implant inclination and marginal bone loss.
• To assess the 5-year outcome of freestanding implant-supported FPDs concerning bone levels.
• To determine if implant angulation influences peri-implant bone changes over time.

Main Methods:

• Retrospective analysis of 42 freestanding FPDs in 38 patients over 5 years.
• Measurement of mesio-distal and buccal-lingual implant inclination using standardized photographs.
• Categorization of implants into axial and non-axial groups based on inclination angles.
• Statistical comparison of bone level changes between axial and non-axial implants using Mann-Whitney U-test.
• Correlation analysis between inter-implant inclination and bone level change using Spearman's test.

Main Results:

• No statistically significant difference in 5-year marginal bone level change was observed between axial (0.4 mm) and non-axial (0.5 mm) positioned implants.
• Inter-implant inclination (mesial-distal and buccal-lingual) showed no significant correlation with 5-year bone level change.
• The study found no evidence that implant inclination impacts peri-implant bone loss.

Conclusions:

• Implant inclination does not appear to influence marginal bone loss in freestanding implant-supported FPDs.
• The hypothesis that implant angulation affects peri-implant bone loss was not supported by this study.
• Further research may explore other biomechanical or biological factors influencing bone stability around implants.