Direct assessment of profilometric roughness variability from typical implant surface types

Area of Science:

• Biomaterials Science
• Surface Engineering
• Dental Implantology

Background:

• Surface roughness is critical for dental implant osseointegration.
• Current methods for quantifying implant surface roughness lack standardization.
• Variability in measurement protocols can lead to inconsistent data.

Purpose of the Study:

• To evaluate the accuracy and precision of common roughness characterization instruments used in the dental implant industry.
• To compare the performance of interferometers and stylus profilometers for measuring average roughness (Ra).
• To assess the influence of different surface treatments on roughness measurements.

Main Methods:

• Four types of dental implant surfaces (machined, acid-etched, hydroxyapatite-coated, titanium plasma-sprayed) were analyzed.
• Average roughness (Ra) was measured using an interferometer and a stylus profilometer.
• Scanning electron microscopy (SEM) was used for cross-sectional topographic analysis.
• Analysis of variance (ANOVA) was employed to determine the significance of instrument type, surface treatment, and measurement parameters.

Main Results:

• Both surface treatment and instrument type significantly influenced Ra measurements (P < .0001).
• The interferometer demonstrated higher accuracy in predicting SEM-based roughness compared to the stylus profilometer.
• The stylus profilometer exhibited superior aggregate precision (lower coefficient of variation) over all measurements.

Conclusions:

• Accuracy and precision of surface roughness quantification depend heavily on the chosen characterization technique.
• Instrument variability in roughness measurement may complicate the establishment of correlations between implant surface topography and osseointegration.
• Standardized protocols for roughness measurement are needed to ensure reliable data in dental implant research.