Dental General c853613f The retention of dowel in a pin retained crown is increased by A Increased length, smooth surface and increased taper. B Increased length, serrated surface and increased taper. C Increased length, smooth surface and parallel sides. D Increased length, serrated surface and parallel sides. High-Yield Explanation Post should be at least 2/3 the root length, parallel sided and serrated for increased retention in the canal