Mathematical shape matching as a tool in tooth wear assessment – development and conduct

Mitchell, Harvey; Chadwick, R. G.

doi:10.1046/j.1365-2842.1998.00324.x

Cited by 35 publications

(36 citation statements)

References 7 publications

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“…The resultant maps may be compared using a surface matching and difference detection algorithm. This technique provides readings with good accuracy and reproducibility [60][61][62] [ [43][44][45]. Erosions of 50 tJm magnitude occurring over a 9 month period were recorded to a precision of about ±15 tJm [59] [42].…”

Section: Surface Profilometrymentioning

confidence: 99%

Methods for Assessment of Dental Erosion

Attin¹

2006

Monographs in Oral Science

121

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Various assessment techniques have been applied to evaluate the loss of dental hard tissue and the surface-softened zone in enamel induced by erosive challenges. In this chapter, the most frequently adopted techniques for analyzing the erosively altered dental hard tissues are reviewed, such as profilometry, measuring microscope techniques, microradiography, scanning electron microscopy, atom force microscopy, nano-and microhardness tests and iodide permeability test. Moreover, methods for chemical analysis of minerals dissolved from dental hard tissue are discussed. It becomes evident that the complex nature of erosive mineral loss and dissolution might not be comprehended by a single technique, but needs application of different approaches for full understanding. Chapter 10Lussi A (ed): Dental Erosion. Monogr Oral Sci. Basel, Karger, 2006, vol 20, pp 152-172 Methods for Assessment of Dental Erosion Thomas Attin, Florian Just WegehauptCenter for Dental Medicine, Clinic for Preventive Dentistry, Periodontology and Cariology, University of Zurich, Zürich, Switzerland AbstractVarious assessment techniques have been applied to evaluate the loss of dental hard tissue and the surface-softened zone in enamel induced by erosive challenges. In this chapter, the most frequently adopted techniques for analyzing the erosively altered dental hard tissues are reviewed, such as profilometry, microradiography, scanning electron microscopy, atom force microscopy, nano-and microhardness tests and iodide permeability test. Moreover, methods for chemical analysis of minerals dissolved from dental hard tissue are discussed. It becomes evident that the complex nature of erosive mineral loss and dissolution might not be comprehended by a single technique, but needs application of different approaches for full understanding. Copyright © 2006 S. Karger AG, Basel Acid attack leads to an irreversible loss of the outermost enamel and dentin layers and to partial demineralization (softening) of the tooth surface. In enamel, the thickness of the softened layer is estimated to be 2-5 tJm [1,2] [1, 2]. The softened eroded tooth surface is highly susceptible to abrasive wear, and mechanical impacts such as toothbrushing can easily remove the superficially demineralized dental hard tissue [3][4][5] [3][4][5]. For simulating intra-oral erosion as closely as possible, it is desirable to assess the erosive effects on native tooth surfaces. Most of the methods described below need polished surfaces for precise assessment of the erosively induced defects or for creating reference surfaces, which means that the natural, often fluoridated surface of the tooth has to be removed. However, it should be considered that in the case of intra-oral erosion the outermost surface layers are also continuously removed by the acid attack, so that a 'polished' surface is Attin 2 cre-ated. When monitoring of erosive surface alterations within a period of time is performed, it could become necessary to fix a specimen in the measuring device i...

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Section: Surface Profilometrymentioning

confidence: 99%

Methods for Assessment of Dental Erosion

Attin¹

2006

Monographs in Oral Science

121

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“…The technique of least squares surface matching has been widely applied for registration of photogrammetrically-derived DEMs in the context of a number of applications (e.g. Mitchell and Chadwick, 1998;Mills et al, 2005). This is an automated technique which minimises differences between overlapping DEMs by establishing pointto-point or point-to-surface correspondences.…”

Section: Introductionmentioning

confidence: 99%

Application of Surface Matching for Improved Measurements of Historic Glacier Volume Change in the Antarctic Peninsula

Kunz

Mills

Miller

et al. 2012

Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.

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ABSTRACT:Climate records show that the Antarctic Peninsula is rapidly warming. Dramatic changes in ice shelf and glacier extent have been recorded over the last few decades. Mapping recent changes in the Antarctic Peninsula is relatively straightforward, as increased amounts of earth observation data become readily available for scientific purposes. However, long term measurements of volumetric changes within the region are rare and less is known of changes which have occurred over the second half of the 20th Century. Nonetheless, historical observations are available in the form of archival aerial stereo-photography. However, extracting information from historical data, i.e. to compare it to recent data, is not trivial, and to-date, this data source remains largely untapped, despite its rich potential. Often such imagery is stored in non-digital format and may have degraded over time. Other problems relate to insufficient metadata or ground control. Typically these difficulties result in poor registration of multi-temporal DEMs, which degrade subsequent measurements of surface change. This is one of the fundamental limitations of accessing archival datasets. In this research a least squares surface matching technique is introduced to overcome these challenges and achieve reliable registration of multi-temporal DEMs. Historical imagery acquired in the 1960s for two Antarctic Peninsula glaciers is processed to extract DEMs, which are subsequently compared to DEMs derived from modern ASTER satellite data and aerial photography. Through the surface matching approach, it is shown that the registration accuracy of the historical and modern-day datasets can be improved significantly. This enables precise quantification of glacier elevation changes on a multi-decadal time scale. Frontal glacier surface lowering of up to 50 m was observed over the last ~4 decades. Results of this study allow a better understanding of historical volumetric glacier changes of the Antarctic Peninsula and provide an efficient and automated method for improved DEM co-registration.

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“…In other areas, such as tooth wear measurements (Zhou and Zheng, 2008;Pintado MR et al, 2000;Mitchell and Chadwick, 1998) this has not been the case. There have been some 640 papers published in tooth wear measurement over the period of 1960 to 2007, and the measurements within these papers are wide ranging using a clinical tooth wear index, a modified index, reduced depth of tooth surface in the laboratory, reduced volume and changes in percentage of the area or volume.…”

Section: Standards Around the Areamentioning

confidence: 99%