COMPOSITE TECHNIQUE SMILE DESIGN COMPANIES/MATERIALS MATERIAL SCIENCE
SURFACE DEFECTS
Composite covers surface defects to achieved improved esthetics. Surface defects of discoloration have tooth backing when viewed from the facial. Color behind composite shows through to influence final restoration color. Composite thickness required to block out underlying color is dependant on the amount of color change, the translucency of the composite, and the quality of light. Often, tooth reduction is required to achieve adequate composite thickness. Multiple layers of composite consisting of opaquers, opaque composites and translucent enamel is required for significant color change.
Restoration of improper contours requires replacement of lost tooth structure. Dentin, enamel and translucent composites combined with tints are used. Understanding composite translucency is critical to successful restoration. A composite that is too translucent shows through improper light reflection of underlying irregular surfaces. A composite that is not translucent enough produces an opaque restoration. Proper translucency when combined with proper tooth preparation, shows through tooth color and provides a gradual transition of color from tooth structure to composite.
Tooth defects are prepared with diamond burs to produce rough surfaces for increased bond strength. Bevels surround a preparation to provide thin composite that shows through tooth color creating a chameleon effect.
Acid is placed on enamel for 15 to 30 seconds. Acidity is neutralized so only 10 microns of enamel is removed. Inorganic structure dissolves quicker than organic structure and a porous, honeycomb surface is created. Resin bonding agent followed by composite is placed and cured.
Light from overhead and dental lights initiates setting of composite and should be minimized. Heat from the mouth and room cause composite to flow easier and become sticker and should be minimized.
Final shaping and polishing is done with burs, sandpaper disks, rubber wheels, points, cups, and polishing pastes. Final polishing is done with fine sandpaper disks with water or polishing paste and rubber cups with appropriate polishing paste. Final polish should not recontour or change surface shape. It should only create smooth surfaces. Occlusial adjustments are made with burs, sandpaper disks, rubber point or wheels.
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COMPOSITE TECHNIQUE SMILE DESIGN COMPANIES/MATERIALS MATERIAL SCIENCE