What is the effect of over-contouring temporary crowns on gingival health?

Over-contouring temporary crowns can have a detrimental effect on gingival health, which is why the chosen answer is correct. When a temporary crown is excessively contoured, it can interfere with the natural anatomy of the gingival tissue. This can create areas where plaque and bacteria can accumulate more easily, leading to inflammation and potential periodontal issues.

Moreover, if the crown extends too far beyond the tooth structure, it could cause mechanical irritation to the gum tissue, resulting in gingival irritation and possibly leading to a condition known as gingivitis. If the temporary crown does not fit appropriately and exerts undue pressure on the gums or fails to mimic the natural contour of the tooth, the surrounding tissues are more likely to become inflamed.

In contrast, if a temporary crown is well-contoured, it can support gingival health by maintaining the proper relationship with the surrounding gum tissue and encouraging good oral hygiene practices. Hence, over-contouring disrupts this balance and may aggravate gingival health significantly.