Which of the following is considered a local contributing factor for periodontal disease?

A) Calculus
B) Amalgam overhang
C) A poorly contoured crown margin
D) All of the above

D
Explanation: A) Local contributing factors for periodontal disease include amalgam overhangs, poorly contoured crown margins, and calculus deposits, which all act as traps that can lead to the buildup of bacterial pathogens that cause periodontal diseases.
B) Local contributing factors for periodontal disease include amalgam overhangs, poorly contoured crown margins, and calculus deposits, which all act as traps that can lead to the buildup of bacterial pathogens that cause periodontal diseases.
C) Local contributing factors for periodontal disease include amalgam overhangs, poorly contoured crown margins, and calculus deposits, which all act as traps that can lead to the buildup of bacterial pathogens that cause periodontal diseases.
D) Local contributing factors for periodontal disease include amalgam overhangs, poorly contoured crown margins, and calculus deposits, which all act as traps that can lead to the buildup of bacterial pathogens that cause periodontal diseases.