Comput. Biol. Med. - Comparison of an analog and digital quantitative and qualitative analysis for the fit of dental copings.

Tópicos

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Resumo

CKGROUND: Precision in fit is crucial for dental crowns and bridges. Most analyses of fit are based on analog 2D techniques. Aim of this in-vitro study was to compare an analog and a digital quantitative and qualitative analysis for the fit of CAD/CAM fabricated dental copings.METHODS: A prepared steel canine served as master die. CAD surface models, varying in data density, were purposely enlarged in height (Ez), circumference (Exy) and both of these aspects at once (Exyz). Two titanium copings for each variation were produced. The silicone-replica-technique was applied to analyze the fit by means of a 2D analog light microscope measurement (LMM) and a 3D computer-assisted measurement using an optical digitizing system (ODKM97), respectively.RESULTS: In most cases, restorations based on the low data density showed a better fit than those based on high data density. Original size low density data showed the lowest marginal and axial values in the quantitative 2D analyses (LMM and ODKM97). The 3D measurements (ODKM97) revealed best fit of the low density original size specimens, whereas the Ez specimens showed the highest values. Noticeable variations in fit were detected marginally and axially depending on the specific measurement point (mesial, distal, oral, or buccal) for both measurement systems.DISCUSSION: The analog 2D replica technique revealed a loss of information due to the necessary cutting process. By contrast, the digital computer-based method provided 3D quantitative and qualitative results without data loss over the complete surface.

Resumo Limpo

ckground precis fit crucial dental crown bridg analys fit base analog d techniqu aim invitro studi compar analog digit quantit qualit analysi fit cadcam fabric dental copingsmethod prepar steel canin serv master die cad surfac model vari data densiti purpos enlarg height ez circumfer exi aspect exyz two titanium cope variat produc siliconereplicatechniqu appli analyz fit mean d analog light microscop measur lmm d computerassist measur use optic digit system odkm respectivelyresult case restor base low data densiti show better fit base high data densiti origin size low densiti data show lowest margin axial valu quantit d analys lmm odkm d measur odkm reveal best fit low densiti origin size specimen wherea ez specimen show highest valu notic variat fit detect margin axial depend specif measur point mesial distal oral buccal measur systemsdiscuss analog d replica techniqu reveal loss inform due necessari cut process contrast digit computerbas method provid d quantit qualit result without data loss complet surfac

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