Dissertation > Medicine, health > Oral Sciences > Oral orthotics > Dental Materials Science

A Study of Three Types of Metal Ceramic Restoration on the Color Difference

Author MaoRanRan
Tutor CaiYuHui
School Nanjing Medical University
Course Clinical Stomatology
Keywords Shade guide Metal ceramic crown Firing Digital camera Computer
CLC R783.1
Type Master's thesis
Year 2006
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In virtue of good function , handsome color and persistent firmness, the metal ceramic restoration has been one of the widely used means in clinical restoration. How to recur the color of natural human teeth is an issue concerned by both dentists and patients. However, there are many factors affecting final restored effect. They include preparation of abutment, fired condition, different porcelain, different based crown and thickness of porcelain layer. With the advance of new dental materials, Auro-galvano-crown and noble metal porcelain crown are applied. Therefore, nichrome metal porcelain crown will be faced with a large challenge. Color differences have been found between the shade guide and metal ceramic restorations in clinical work. CIE1976 L*a*b* color system and a digital camera and computer were selected to measure and compare characteristic of VITA shade guide and three types of metal ceramic restorations and those of repeated firings. The results will provide some references for better tooth color selection, better selection and facture of metal ceramic restoration.Part Ⅰ : A laboratorial Study of three types of metalceramic restorations on the color differenceObjictive: The purpose of this study was to study the color distributions of three types of metal ceramic restoration and VITA shade guide. Materials and Methods: Three types of metal ceramic restorations were made on the basis of the same die.A2 shade slices in the shade guide were selected to be the contrast. On the same condition ,CIE1976 L*a*b* color system , a digital camera , computer and a standard light source were selected to measure and compare the characteristic of A2 shade slice in the shade guide and three types of metal ceramic restorations. Results: The value of metal ceramic restoration was brighter than that of VITA

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