Which surface of a crown typically has the lowest significance in total retention?

In the context of dental crown design, the occlusal surface is typically considered to have the lowest significance in terms of total retention. This is because the occlusal surface primarily engages in vertical forces during chewing, rather than resisting dislodgment. Retention of crowns relies heavily on resistance forms, which are often influenced by the contours and shapes of the facial, lingual, and mesial surfaces. These surfaces contribute significantly to the crown's ability to withstand lateral and tipping forces, which are critical for maintaining stability and position within the dental arch.

The facial, lingual, and mesial surfaces can be designed to enhance retention through their geometric configurations, often involving features such as taper and contour that help resist the dislodging forces. Conversely, the occlusal surface, while important for functional occlusion and wear resistance, does not contribute significantly to the retention of the crown in the same manner as these other surfaces.

In summary, due to its role in force distribution rather than retention, the occlusal surface is recognized as having lower significance when considering the overall retention of a crown. This understanding is crucial in the design and placement of crowns to ensure their longevity and effectiveness.