Operative Dentistry - Posterior teeth composite restoration - Part 2 and 3 ( Incremental Techniques )
Incremental Techniques For Direct Composite Restoration • When placing posterior composites, the use of small increments is recommended by many authors for insertion and polymerization so that the after effect of shrinkage stress can be reduced. C – Factor : • The C– factor concept is the relationship between the ratio of the free and restrained composite surface area of a dental restoration, that means the ratio of bonded surfaces to the unbounded, or free surfaces in a tooth preparation. 1- Horizontal layering technique : • The horizontal placement technique utilizes composite resin layers, each <2.0 mm thick. • This technique has been reported to increase the C-factor, and thereupon increases the shrinkage stresses between the opposing cavity walls 2- Oblique layering technique : • The oblique technique is accomplished by placing a series of wedge-shaped composite increments. • Each increment is photocured twice, first through the cavity w...