IADR Abstract Archives
Understanding interproximal dental wear using 3D surface texture analysis
Objectives: The dentition is considered as a dynamic system since it is routinely exposed to masticatory forces, soft tissue pressure and internal processes. Therefore, any dental contact either between adjacent teeth or antagonist teeth should not be considered as static condition rather a dynamic process, especially the contact between adjacent teeth. Several attempts were made to clarify dental attrition and wear mechanisms, however, since interproximal attrition presents different characteristics than occlusal attrition interproximal dynamic force system should be considered as a separate entity. Using engineering interdisciplinary approach, we aim to reveal the biomechanical mechanism of this phenomenon.
Methods: The sample composed of 15 extracted lower first premolars, for each specimen three areas were sampled; center of the proximal wear facet, border of the facet and outside region. Analysis was done using an high-resolution confocal disc-scanning measuring system (100x long distance lens, μsurf explorer, NanoFocus AG, Germany). Standardized ISO parameters of roughness (ISO 25178, ISO12871) were applied on surface measurements using Mountains Map Premium software version 7.3.7. (DigitalSurf, France).
Results: The results indicated that three different regions were identified in the facet area. Especially presenting a distinct difference between the inner area of the facet to its border.
Most roughness parameters (26 parameters out of the 30 measured parameters) including height, functional (plane), spatial, hybrid, functional (volume) and feature indicated difference between the regions (p<0.05) .
Conclusions: Based on our observations, we defined three different regions in the contact area of the tooth which manifested unique micro-texture topography. Using nano-scale roughness measurements with combination of engineering perspective we rejected some of the possible wear models, and hereby we suggest a new approach to explain interproximal facets formation. We suggest that interproximal attrition is consisting mainly on fretting which explains the annulus structure of the Proximal attrition facet as well as the radial and tangential scratches in the circumference of the facet and that adhesion predicts small scale subsurface cracks which terminates in wear particle.
Methods: The sample composed of 15 extracted lower first premolars, for each specimen three areas were sampled; center of the proximal wear facet, border of the facet and outside region. Analysis was done using an high-resolution confocal disc-scanning measuring system (100x long distance lens, μsurf explorer, NanoFocus AG, Germany). Standardized ISO parameters of roughness (ISO 25178, ISO12871) were applied on surface measurements using Mountains Map Premium software version 7.3.7. (DigitalSurf, France).
Results: The results indicated that three different regions were identified in the facet area. Especially presenting a distinct difference between the inner area of the facet to its border.
Most roughness parameters (26 parameters out of the 30 measured parameters) including height, functional (plane), spatial, hybrid, functional (volume) and feature indicated difference between the regions (p<0.05) .
Conclusions: Based on our observations, we defined three different regions in the contact area of the tooth which manifested unique micro-texture topography. Using nano-scale roughness measurements with combination of engineering perspective we rejected some of the possible wear models, and hereby we suggest a new approach to explain interproximal facets formation. We suggest that interproximal attrition is consisting mainly on fretting which explains the annulus structure of the Proximal attrition facet as well as the radial and tangential scratches in the circumference of the facet and that adhesion predicts small scale subsurface cracks which terminates in wear particle.