Objectives: This study aims to assess the correlation between different implant diameters and different cantilever lengths to anterior-posterior spread on the stability of implants placed in maxillary edentulous ridges.
Materials and methods: In sixteen patients, a total of 96 implants were implanted, over which screw-retained implant-supported maxillary prostheses were constructed. The patients were divided into two groups using sealed envelopes for randomization: Group I received implants with a small diameter of 3.0 mm, while Group II received implants with a standard diameter of 3.7 mm. Patients in each group were further divided into two subgroups, Groups IA, IB, and Groups IIA, and IIB. The cantilevers lengths to anterior-posterior AP implant spread (CL: AP) in Groups IA and IIA was at a ratio of 1:3, whereas in Groups IB and IIB, the CL: AP was performed at a ratio of 1:2. Implant Stability Values were measured at 0, 4, 8, and 24 months after prostheses delivery.
Results: The correlation between Implant Stability ISQ values and different implant diameters was calculated by using Spearman`s correlation coefficient which revealed a positive (+), weak (r=0.21), insignificant (P=0.16) correlation, while the Correlation between Implant Stability ISQ values and different cantilever lengths were calculated by using Spearman`s correlation coefficient which revealed a negative (-), weak (r=-0.529), significant (P<0.0001*) correlation.
Conclusion: Within the limitations of this study, it can be concluded that changing the AP spread to cantilever lengths and varying implant diameter may have an impact on the stability of implants supporting maxillary screw-retained prostheses