Microscope observations of ART excavated cavities and restorations

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dc.contributor.author Grossman, E. S.
dc.contributor.author Mickenautsch, S.
dc.date.accessioned 2016-04-26T09:59:11Z
dc.date.available 2016-04-26T09:59:11Z
dc.date.issued 2002
dc.identifier.citation Grossman,E.S., Mickenautsch,S. 2002. Microscope observations of ART excavated cavities and restorations. Journal of the South African Dental Association;57(9):359-363 en_ZA
dc.identifier.uri http://hdl.handle.net/10539/20260
dc.description KIM en_ZA
dc.description.abstract This in vitro light and scanning electron microscope study examined 39 extracted tooth specimens, hand excavated and restored according to atraumatic restorative treatment (ART), using 'press finger', by 'skilled' and 'novice' operators. Surface features of five excavated cavities, 12 restoration surfaces and the tooth restoration relationships of 22 bisected restored tooth crowns were examined to better understand the clinical effect of the technique. Hand-excavated cavity surfaces were rough with a complex surface arrangement of grooves, crevices, ridges, furrows and overhangs. Enamel and dentine were covered with debris except where surface fractures exposed enamel prisms and occluded dentinal tubules. Ten of the 22 bisected restored specimens had large voids (1-3 mm in length) within the glass-ionomer cement (GIC) restoration or at the tooth-restoration interface. Smaller bubbles (< 50 microns) and irregular shaped inclusions were common in all restorations. Adaptation of the GIC to the cavity margin was extremely variable and easily distinguished from the effects of dehydration shrinkage. It is thought that cavity surface irregularities could cause placement problems making it difficult to adapt the GIC to cavity peripheries. While 'press finger' enabled excellent penetration of GIC into fissures, the technique left restoration surfaces rough. At low magnification, surfaces were irregular; at magnifications higher than X500 scratches, pits, porosities, chipping and voids were evident. However, the 'press finger' technique was able to merge the GIC to a fine edge on the occlusal surface so that the restoration margin was not obvious. No apparent difference was found between the restorations placed by the 'skilled' and 'novice' operators. Tooth-restoration relationships in the ART approach are entirely different to those of traditional restorative techniques. The ART approach requires skill, diligence and comprehension to be undertaken correctly. en_ZA
dc.language.iso en en_ZA
dc.subject Microscopy, Electron, Scanning en_ZA
dc.subject Dental Restoration, Permanent en_ZA
dc.subject Dental Caries en_ZA
dc.subject Dentin en_ZA
dc.title Microscope observations of ART excavated cavities and restorations en_ZA
dc.type Article en_ZA


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