Evaluating the relative optical translucency of opaquers composite resins

Abstract EN

Objective: To measure and compare the relative optical translucency of the opaque resins of both laboratory and clinical composites. Methods: Four discs, 13 mm in diameter and 1 mm in thickness, of the opaque resins of two laboratory composites (Sinfony & Solidex) and two clinical composites (Pertac hybrid & Esthet.

X) were prepared.

One disc was prepared for each material.

The discs were prepared using a silicon mold 13 mm in diameter and 1.5 mm in thickness.

The discs were prepared by curing the material in layers of suitable thickness then the discs were finished using 600 grit silicon carbide.

The final thickness of the discs after polishing was 1.0 mm.

Finally the discs were dried in an oven at 90 ° C for 24 hours.

A Perkin Elmer Spectrophotometer with an integrating sphere was used to measure the total transmittance of each disc between 400-700 nm at 1 nm intervals. Results: The total transmittance of the opaque resins of the laboratory composites was 0.03% for Sinfony and 0.05% for Solidex while for the clinical composites it was 39.22% for Pertac hybrid and 45.88% for Esthet.

X. Conclusion: Opaque laboratory resins are extremely opaque while the clinical composites are much less opaque.