Differentiation of enamel lesion activity by vertical reflection intensity – a methodical description
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Lutz Jaruszewski
Abstract
This article describes two objective, instrumental approaches for the distinction of enamel lesion activity – the in vitro measurement of surface layer porosity and surface roughness – and on this basis, the in vivo measurement of vertical reflection intensity (VRI). They are based on the subjective visual and tactile criteria of a dull and rough or a shiny and smooth surface, accepted by the known diagnostic systems, Nyvad criteria, International Caries Detection and Assessment System II, and Universal Visual Scoring System. With a scanning white-light interference microscope, the active lesion surface had a high porosity (118 pores) and a high roughness (Ra 190 nm) constituting a field of view of 280×210 μm. The inactive lesion surface had almost no porosity (one pore) and a more than 10-fold lower roughness (Ra 10 nm) for the same area. These differences result in a different light reflection of the lesion surfaces, which can be measured as VRI with a chromatic confocal sensor with spacer (mean VRI: active lesions, 7%; inactive lesions, 25%; sound enamel, 35%). In addition to monitoring, this sensor allows an in vivo handheld evaluation in a single (visit) examination.
©2012 by Walter de Gruyter Berlin Boston
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Artikel in diesem Heft
- Original Articles
- Comparing measured and simulated wave directions in the left atrium – a workflow for model personalization and validation
- Computer aided approximation of flow rate through systemic-pulmonary arterial shunts (SPAS)
- Comparison of flow dynamics of Perimount Magna and Magna Ease aortic valve prostheses
- Percutaneous dilational tracheostomy (PDT) and prevention of blood aspiration with superimposed high-frequency jet ventilation (SHFJV) using the tracheotomy-endoscope (TED): results of numerical and experimental simulations
- Development of a test system to analyze different hip fracture osteosyntheses under simulated walking
- Influence of cementless hip stems on femoral cortical strain pattern depending on their extent of porous coating
- A portable magnetic induction measurement system (PIMS)
- Differentiation of enamel lesion activity by vertical reflection intensity – a methodical description
- Masthead
- Masthead
