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Association Between Implant Positioning Parameters and Prosthetic Failure in Full-Arch Fixed Implant-Supported
Sumanjit Midha1, Sami Faisal Jamdar2, Sunaina Singla3
1Department of Prosthodontics and Crown and Bridge, Gian Sagar Dental College and Hospital, Rajpura, IND.
Cureus
|July 6, 2026
Summary
Implant positioning significantly impacts full-arch prosthesis success. Increased angulation and cantilever length raise failure risk, while wider implant spread enhances stability, reducing complications.
Area of Science:
- Dental Implantology
- Prosthodontics
- Biomaterials Science
Background:
- Prosthetic complications are a major challenge in full-arch fixed implant-supported prostheses.
- Implant positioning parameters like angulation and cantilever extension may influence stress distribution and failure.
- Understanding these associations is crucial for improving long-term prosthetic stability.
Purpose of the Study:
- To evaluate the association between implant positioning parameters and prosthetic failure in full-arch fixed implant-supported prostheses.
- To identify specific implant positioning factors that contribute to prosthetic complications.
Main Methods:
- Retrospective matched case-control study of 90 participants (30 with failure, 60 controls).
- Analysis of cone-beam computed tomography (CBCT) records to assess implant angulation, vertical position, anteroposterior spread, and cantilever dimensions.
- Statistical analysis to determine significant associations (p < 0.05).
Main Results:
- Repeated screw loosening (43.3%) and framework fracture (36.7%) were the most common complications.
- Significantly greater mesiodistal angulation, buccolingual angulation, vertical implant position, and distal cantilever length were observed in the failure group.
- Increased anteroposterior spread and inter-implant distance showed a protective effect against prosthetic failure.
Conclusions:
- Implant positioning parameters critically influence prosthetic outcomes in full-arch restorations.
- Higher implant angulation and cantilever extension correlate with increased prosthetic failure risk.
- Optimizing implant placement for greater spread and inter-implant distance can enhance biomechanical stability and reduce technical complications.
