Introduction and Etymology of Calculus - The word 'calculus' comes from Latin, meaning 'small stone' or 'limestone.' - The term 'calculus' was used for various kinds of stones. - The word 'calculate' is derived from 'calculus,' referring to the use of stones for mathematical purposes. - 'Calculus' in the 18th century came to be used for mineral buildups in human and animal bodies, such as kidney stones and minerals on teeth. - 'Tartar' originates from Greek as the term for the white encrustation inside casks.

Composition and Formation of Calculus - The organic component of calculus is approximately 85% cellular and 15% extracellular matrix. - Calculus contains primarily bacterial cells, including species of archaea and yeast. - The organic extracellular matrix in calculus consists of proteins, lipids, and extracellular DNA. - Trace amounts of host, dietary, and environmental microdebris are also found within calculus. - These microdebris include salivary proteins, plant DNA, milk proteins, starch granules, textile fibers, and smoke particles. - Supragingival calculus forms on the buccal surfaces of upper molars and lingual surfaces of lower incisors. - Subgingival calculus forms below the gumline and is typically darkened in color by black-pigmented bacteria. - Dental calculus forms in incremental layers, visible through electron microscopy and light microscopy. - The timing and triggers of calculus formation events are poorly understood. - Various factors influence the formation of dental calculus, including age, gender, diet, oral hygiene, bacterial plaque composition, and systemic diseases.

Clinical Significance of Calculus - Calculus accumulation causes gingivitis and periodontitis. - Calculus serves as a trap for increased plaque formation and retention. - Supragingival plaque contains aerobic bacteria and yeast, while subgingival plaque contains anaerobic bacteria. - Anaerobic plaque bacteria trigger inflammation in the periodontium, leading to bone loss and weakening of gingival fibers. - Almost all individuals with periodontitis exhibit considerable subgingival calculus deposits.

Prevention and Removal of Calculus - Toothpaste with pyrophosphates or zinc citrate can reduce plaque accumulation. - Some calculus may form without plaque deposits through direct mineralization of the pellicle. - Regular brushing and flossing can help prevent calculus formation. - Regular dental check-ups and professional cleanings can remove calculus buildup. - Maintaining good oral hygiene practices is essential for preventing calculus formation. - Plaque and calculus deposits are major contributors to oral disease. - Dental hygienists use specially designed instruments to remove plaque and calculus deposits. - Calculus deposits cannot be removed by brushing or flossing alone. - The frequency of dental hygiene treatment depends on individual patient needs. - Hand instruments like scalers, curettes, jaquettes, hoes, files, and chisels are used for calculus removal. - Ultrasonic scalers are effective in removing calculus, stain, and plaque. - There are two types of ultrasonic scalers: piezoelectric and magnetostrictive. - Special tips for ultrasonic scalers are designed for different areas of the mouth and amounts of calculus buildup. - Heat is generated at the tip of the scaler, so a water spray is used to cool it during debridement. - Small adaptations are necessary to keep the tip of the scaler in contact with the tooth surface. - Near-ultraviolet and near-infrared lasers are being researched for more effective calculus removal. - Lasers offer advantages over conventional hand instrumentation for accessing periodontal pockets. - Near-infrared lasers, like the Er,Cr:YSGG laser, are effective for root scaling due to their absorption by water. - Near-ultraviolet lasers allow for quick calculus removal without removing healthy tooth structure. - Dental hygienists require additional training on laser use where permitted by legislation.

Miscellaneous Information - Dental calculus is a hard deposit that forms on teeth. - It is composed of inorganic mineralised substances such as calcium phosphate and calcium carbonate. - Calculus formation is influenced by factors like oral hygiene, diet, and saliva composition. - Bacteria in dental plaque play a crucial role in calculus formation. - Calculus can accumulate both above and below the gumline. - Calculus can lead to gum inflammation and periodontal disease. - It provides a rough surface for plaque bacteria to adhere to, making oral hygiene more challenging. - Calculus buildup can cause bad breath (halitosis). - It can contribute to tooth decay and cavities. - Dental calculus can also harbor harmful bacteria that may contribute to systemic health issues. - Dental calculus can preserve a wealth of biological data from ancient populations. - Microbial analysis of ancient dental calculus provides insights into the oral microbiome of past populations. - Studies have identified ancient pathogens and evidence of dietary habits through dental calculus analysis. - Ancient dental calculus has revealed the consumption of plants, milk, and even evidence of medicinal plant use. - Dental calculus analysis has also shed light on the oral health and hygiene practices of ancient populations. - Dental calculus analysis is not limited to human studies; it has been used in animal studies as well. - Studies have examined the oral health and diet of domestic pets through dental calculus analysis. - Dental calculus analysis in chimpanzees has provided insights into their plant consumption and life history transitions. - Ancient DNA analysis of dental calculus has revealed information about Neanderthal behavior, diet, and disease. - Dental calculus analysis has also been used to study changes in oral microbiota with dietary shifts in different time periods.