Calculus

Calculus is defined as a "Hard deposit that is formed by mineralization of dental plaque on the surfaces of natural teeth and dental prosthesis, generally covered by a layer of mineralized plaque". Periodontitis is a chronic inflammatory disease of supporting periodontal tissues of tooth which is caused by specific microorganisms in a susceptible host. Bacterial plaque and calculus are considered as main etiologic agents in the initiation and progression of periodontal diseases. Retention of plaque close to the gingiva is hastened by formation of supragingival dental calculus.