Evaluation of a collagen scaffold for cell-based bone repair.

Purpose: To determine whether a collagen scaffold could provide an environment for mesenchymal stem cell (MSC)-related bone repair of critical-size bone defects in rat calvaria.

Materials And Methods: Craniotomy defects were created in 28 adult Sprague-Dawley rats. Two additional rats were used as MSC donors by means of femoral bone marrow lavage and culture.

Clinical color match of porcelain visual shade-matching systems.

Background: Accuracy of the total color replication process has not been clinically evaluated for various porcelain visual shade-matching systems.

Purpose: The purpose of this study was to evaluate the final color replication process of three porcelain visual shade-matching systems. Subjects' natural dentition was compared with laboratory-fabricated individualized porcelain shade tabs.