Dental 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. 💡 Explanation The retention of dowel in a pin retained crown is increased by ✓ Correct Answer: D. Increased length, serrated surface and parallel sides.