Why Do Porcelain-Fused-to-Metal (PFM) Crowns Emit an Odor?
Dec 22, 2021
Source: Cainiu Health
Dr. Qin Jianyong
Introduction
Why Do Porcelain-Fused-to-Metal (PFM) Crowns Emit an Odor?
I. Food Debris Accumulation: The unpleasant odor may result from food particles trapped around the PFM crown. These residues, along with necrotic dental tissue, undergo putrefaction and fermentation in saliva—contributing to halitosis.
II. Poor Marginal Fit of the PFM Crown: An ill-fitting crown margin may also lead to odor emission. When experiencing such odor, patients should promptly seek evaluation and treatment at a dental clinic or hospital.
Porcelain-fused-to-metal (PFM) crowns are a commonly chosen restorative material for individuals seeking aesthetic dental improvements. PFM crowns not only enhance the appearance of teeth—making them look neater and more uniform—but also preserve normal masticatory function and support overall oral health. However, many patients experience unpleasant odors emanating from their PFM crowns following placement. What are the underlying causes of this phenomenon?
Why Do PFM Crowns Emit an Unpleasant Odor?
I. Accumulation of Food Debris
An unpleasant odor from a PFM crown may result from food debris and necrotic dental tissue trapped in the oral cavity, which undergoes putrefaction and fermentation in saliva—a common cause of halitosis. This typically occurs when teeth suffer from advanced caries. Alternatively, poor marginal adaptation of the PFM crown may allow bacterial infiltration and accumulation, contributing to post-restorative halitosis.
II. Poor Marginal Adaptation of the PFM Crown
Inadequate marginal fit of the PFM crown is another potential cause of odor. When patients notice an unpleasant smell, they should promptly consult a dentist for evaluation. If clinical examination reveals significant gaps between the crown margin and tooth structure—or even marginal caries—the defective restoration must generally be removed, necrotic dental tissue excised, and the tooth restored anew.
III. Inadequate Postoperative Care
After receiving a PFM crown, patients must take special care to protect the restoration. Unlike natural teeth, PFM crowns are susceptible to chipping or fracture when subjected to excessive force—thus, patients should avoid biting on excessively hard objects. Additionally, meticulous oral hygiene is essential: interdental cleaning with dental floss is recommended, and regular professional dental examinations and cleanings are crucial.
The above outlines the primary causes of odor associated with PFM crowns. Having understood these etiologies, patients should now have a clearer idea of how to prevent such issues. Indeed, diligent post-treatment care plays a vital role in preventing unpleasant odors and other complications related to PFM crowns!
