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Methodology of three-dimensional determination of root surface roughness
Thomas Kocher1, Natascha Langenbeck, Michael Rosin
1Unit of Periodontics, School of Dentistry, Greifswald, Germany. kocher@mail.uni-greifswald.de
Journal of Periodontal Research
|May 15, 2002
Summary
Tooth root surface roughness measurements using laser profilometry depend heavily on measurement conditions. Two-dimensional measurements are sufficient for characterizing root surfaces, simplifying future research.
Area of Science:
- Dental instruments
- Surface metrology
- Biomaterials
Background:
- Root debridement instrument evaluation relies on assessing surface roughness.
- Standardized conditions for measuring tooth root roughness are needed for reliable comparisons.
Purpose of the Study:
- To define the requirements for three-dimensional (3D) roughness measurements of tooth roots using laser profilometry.
- To investigate the influence of measurement parameters on roughness quantification.
Main Methods:
- Laser profilometry was used to measure the roughness of 60 instrumented and 12 untreated root surfaces.
- A low-pass filter and Fourier transformation were applied to distinguish roughness from root form.
- The effects of pixel density and field size on average roughness (Ra) were analyzed.
Main Results:
- Average roughness (Ra) increased with pixel density up to 400 per mm, after which it plateaued.
- Ra values were highly dependent on the scanned field size.
- Correlation coefficients between 2D and 3D roughness parameters (Ra, Rz) ranged from 0.7 to 0.8.
Conclusions:
- Tooth root roughness measurements are significantly influenced by measurement conditions, limiting direct comparison between studies.
- Two-dimensional (2D) roughness measurements are adequate for characterizing root surfaces.