By George A. Freedman
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Additional info for Color atlas of Laminate porcelain Veneers
The hardest situation is one in which the teeth are various different dark shades and they all have to match in the final product. 52 COLOR ATLAS OF PORCELAIN LAMINATE VENEERS When determining the final shade for the maxillary anteriors, the dentist should take into consideration the shade of the mandibular anteriors. If the difference in shade between the two arches is too great, the esthetic result will not be pleasing; a decision must be made either to veneer the lower anteriors as well, or to make a less dramatic alteration in the maxilla.
The plaque products, along with solid food constituents and fluids form a continuous plaque/pellicle complex. This layer serves as an effective barrier to etching by mild acids. In 1973 Mura and his co-workers showed that the etchant alone was not sufficient to do the job". This was further demonstrated by Gwinnett20 in 1976 when he showed that enamel which was etched without a mechanical pre-cleaning was often contaminated by remnants of the pellicle as well as by microorganisms. The obvious conclusion is that in order to maximize the effectiveness of the etchant, the enamel must be pre-treated with a thorough prophylaxis.
3-10 25 CHAPTER 3 FUSION: THE BONDING THAT MADE IT ALL POSSIBLE The average width of the craters found in the Type I etching pattern is about five microns. It is partly for this reason that many luting agents utilize a filler particle size of no greater than five microns. A generally held belief is that by restricting the particle size to five microns or less it is possible for the filler particles to enter into the lumen of the etched enamel. This characteristic of luting composite is of dubious value, however, since even if penetration of a five micron filler particle may be possible and reasonable with a Type I etching pattern, it is probably of no significance whatever in Types II, III or IV.