Periotest method: implant-supported framework fit evaluation in vivo

Area of Science:

• Dental Implantology
• Prosthodontics
• Biomaterials Science

Background:

• Accurate framework fit is crucial in implant prosthodontics to prevent complications.
• Microgaps between implant frameworks and abutments can go undetected until complications arise.
• A reliable method for objectively evaluating implant prosthodontic interface fit is needed.

Purpose of the Study:

• To determine the correlation between laboratory laser measurements of abutment analog-framework fit and intraoral fit assessed by the Periotest method.
• To investigate the utility of laser videography and the Periotest method in quantifying framework fit.
• To explore potential objective evaluation tools for implant prosthodontic fit.

Main Methods:

• A clinical investigation involving 15 subjects with implant-supported fixed partial dentures.
• Framework fit was measured in the laboratory using laser videography (six measurements).
• Intraoral framework fit was quantified using the Periotest method; data analyzed via correlation and regression.

Main Results:

• The overall correlation coefficient between laser measurement and Periotest was weak (r = 0.51).
• Regression analysis indicated a significant intercept for laser videography measurements (p < 0.05).
• Periotest values were negative (mean -7.3 ± 1.2), with variance explained by vertical (delta Z, +0.471) and XY plane misfits (X-YVD, -0.244).

Conclusions:

• No single laser measurement variable strongly correlated with the Periotest method for identifying misfit.
• Weakly correlated laser misfit variables may be clinically observable with increased scrutiny.
• Objective evaluation of implant framework fit requires further refinement beyond current laser and Periotest methods.