text: i am doing a scientific paper on captek crowns and i need some guidance or materials.? i have material from captek.com. it's helpful but it elaborates the lab steps and its just 1 big advertisement. i need some solid, unbiased information. it can be any medium. all help is appreciated. thanks. call dentists and ask to fax then a short interview question sheet.  ask them questions about the product, their experiences, preferences, etc.  the reason captek is so great is becase it uses gold under porcelain instead of a metal alloy.    teeth appear to be a certain color because of many things.  some light reflects off of the outer layer of the tooth (enamal in natural or porcelian in a restorative crown).  some light goes into the tooth and bounces back off the dentin or metal under the outer layer.  some light goes all the way through the tooth (in a natural or all porcelian crown only!).    in a metal substructure, the light that hits the metal and bounces back gives a dark gray tint to the tooth.  in capteck, the gold gives it a yellowish tint which is more normal for teeth.  any crown can match the srounding teeth if enough time and talent is used in selecting the colors.  just like mixing paint, a little tint can change the entire color of the final product.  the dental team must select the correct outer porcelian color that will result in the correct tint after the light from the substructure has reflected through it.  if the outer color matches exactly, then the final product will not because of the substructure.  also, the color and type of light makes a huge difference.  floresent lights makes the colors look different.  special bulbs called daylight lights should be used during color selection - or natural sunlight!  there are many reasurch companies who are similiar to comsumer reports.  call your local dental supplier:  sullivan schein, burkhart dental supply, patterson, jb dental, or a dental labratory.    ask them for articles and studies on those products.