Causes of Tooth Sensitivity After Crown

Fundamentally, tooth sensitivity associated with dental crowns arises when stimuli such as temperature, pressure, and others reach the nerves remaining in the capped tooth. These nerves, located in the central, “pulp” portion of the tooth, become exposed when the porous dentin layer becomes exposed.² Several factors can cause this, including:

• Cement from the crown: The temperature sensitivity associated with crown placement arises due to the cement used to bond the crown to the remaining structure. This causes irritation, leading to discomfort and other symptoms.⁴ Typically this sensitivity subsides within a couple of days.   
• Tooth decay or infection: Another cause of tooth sensitivity is decay or infection of the pulp of the crowned tooth. If the crown is improperly put on or the cement that holds it in place comes off, there’s a chance that bacteria can build up underneath. In turn, tooth decay and infection of the pulp can occur, which is a common source of tooth pain and discomfort.¹ In these cases, professional treatment and reworking of the crown is very important.  
• A poorly-fitted crown: When the tooth sensitivity leads to pain in response to pressure as when biting into food or gritting teeth, there’s a good chance that the crown is not the right size. If this cap is too large, it will need to be adjusted and reshaped to fit properly, a relatively quick and simple procedure.¹
• Bite interference: Also known as occlusal interference or malocclusion, bite interference is when the upper and lower jaw (or mandible) are not properly lined up. In these cases, the teeth don’t align when the mouth is closed, and tooth sensitivity often results.⁵ The placement of crowns can contribute to this potentially serious condition.