IADR Abstract Archives
Analysing Early Wear Lesions on Curved Surfaces Using Novel Methods
Objectives: Objective: This study aimed to use novel surface registration methods to detect wear ranging from 1-8 microns on a curved natural enamel surface
Methods: Method: Human buccal enamel samples (n=60) were embedded in acrylic resin and randomly assigned to being polished or natural curved surfaces (n=30). Baseline scans of both surfaces were captured with a non-contact laser profilometer and then they were exposed to 0.3% citric acid (pH 2.7), abrasion (30 linear strokes with 290-295g load) or a combination of erosion and abrasion. Sequential scans were superimposed followed by surface subtraction and residual data used to create step heights.
Results: Results: For the polished samples the mean step heights (SD) after 4 cycles of erosion was 3.08(0.4)μm, 0.26(0.29)μm for abrasion and 4.08(0.37) for the combination. On the natural
surface 1.52(0.22)μm, 0.14(0.04)μm and 3.62(0.39)μm respectively. There were significant differences between the groups for erosion at each time point (p<0.001) and after cycle 4 of erosion and abrasion (p=0.016).
Conclusions: Conclusion: Combining superimposition with subtraction analysis measured step height on natural curved surfaces in the order of a few microns.
Methods: Method: Human buccal enamel samples (n=60) were embedded in acrylic resin and randomly assigned to being polished or natural curved surfaces (n=30). Baseline scans of both surfaces were captured with a non-contact laser profilometer and then they were exposed to 0.3% citric acid (pH 2.7), abrasion (30 linear strokes with 290-295g load) or a combination of erosion and abrasion. Sequential scans were superimposed followed by surface subtraction and residual data used to create step heights.
Results: Results: For the polished samples the mean step heights (SD) after 4 cycles of erosion was 3.08(0.4)μm, 0.26(0.29)μm for abrasion and 4.08(0.37) for the combination. On the natural
surface 1.52(0.22)μm, 0.14(0.04)μm and 3.62(0.39)μm respectively. There were significant differences between the groups for erosion at each time point (p<0.001) and after cycle 4 of erosion and abrasion (p=0.016).
Conclusions: Conclusion: Combining superimposition with subtraction analysis measured step height on natural curved surfaces in the order of a few microns.