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oral pathology - 3 Questions
Cariogenic streptococci, particularly Streptococcus mutans, synthesize extracellular polysaccharides when exposed to high levels of sucrose. These polysaccharides are primarily dextran-like glucans, which are formed from the polymerization of glucose units. Dextran contributes to the formation of dental plaque and biofilm, facilitating the adherence of bacteria to tooth surfaces and promoting caries development.
Radiographic resolution of a periapical lesion (an area of bone loss around the tooth root caused by infection) after proper root canal treatment typically takes time because it involves the biological process of new bone formation to replace the damaged area. This healing process is a gradual one, and while clinical symptoms resolve quickly, visible changes on an X-ray (radiographic resolution) can take several months to become apparent. The 6-12 month timeframe is the established period for significant or complete radiographic evidence of healing in most cases. A longer follow-up period may be needed in some instances.
1. Anodontia: This is the complete absence of teeth. It is a rare condition where an individual fails to develop any teeth. 2. Oligodontia: This term is used when an individual has fewer teeth than the typical dental formula, which is six incisors, two canines, two premolars, and six molars in the permanent dentition (excluding the third molars or wisdom teeth). The term "hypodontia" is often used synonymously with oligodontia, but hypodontia can also refer to a broader range of conditions characterized by the congenital absence of one or more teeth, whereas oligodontia is more specifically the absence of six or more teeth. 3. Microdontia: This condition involves teeth that are smaller than normal. It can affect either the primary or permanent dentition and may involve one tooth or multiple teeth. 4. Dens in dente: This is a rare developmental anomaly where a tooth forms within the dental crown of another tooth, typically in the form of a small tooth-like structure. It is not a condition of tooth number but rather an abnormality of tooth structure.
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