Dental caries progression
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Dental Caries Progression: Key Factors and Patterns
Caries Lesion Activity, Severity, and Tooth Surface Characteristics
Dental caries progression is influenced by the activity and severity of lesions. Active caries lesions are more likely to progress than inactive ones, and more severe lesions (such as micro-cavitated or shadowed) have a higher risk of advancing compared to less severe, non-cavitated lesions. Lesions located on pits, fissures, and proximal surfaces are also more prone to progression than those on smooth surfaces. However, most non-cavitated and micro-cavitated lesions, whether active or inactive, do not progress over a two-year period in adults .
Caries Progression Rates in Children and Adolescents
Caries progression rates vary by population and age. In children, the annual decline in caries-free status in permanent teeth ranges from 0.8% to 10.2%. The annual increment in decayed, missing, and filled surfaces (DMFS) is between 0.07 and 1.77, and in decayed, missing, and filled teeth (DMFT) between 0.06 and 0.73. These rates are higher in populations with greater baseline caries severity, and the methods used in studies can influence reported rates . Longitudinal studies show that children with caries in their primary teeth are much more likely to develop caries in their permanent teeth, following a different and more severe disease trajectory than caries-free children .
Progression in Primary Teeth and Risk Factors
In primary teeth, initial caries lesions have a low progression rate, even over seven years, but moderate lesions are much more likely to progress. The presence of cavitated lesions in other teeth increases the risk of progression for initial lesions. The type of tooth and surface also play a role, with molars and certain surfaces being more susceptible . Tooth surfaces with any baseline caries are at much higher risk of progression compared to sound surfaces, especially as the severity of the initial lesion increases .
Adult Caries Progression and Tooth Loss
In adults, caries experience and tooth loss continue to increase with age, particularly in molars and upper premolars. The mean number of affected tooth surfaces rises as people move from their third to fourth decade of life, with a significant portion experiencing new caries and tooth loss during this period .
Microbial and Host Factors in Caries Progression
Caries progression is driven by the interaction of acid-producing bacteria (such as Streptococcus mutans, bifidobacteria, and lactobacilli), the availability of fermentable sugars, and host factors. While Streptococcus mutans initiates caries, bifidobacteria and lactobacilli enhance progression. The host’s dentine-pulp complex mounts resistance through inflammatory responses and the formation of protective tertiary dentine . As caries progresses, microbial diversity in dental plaque decreases, and the microbial community shifts from competition to cooperation, which may further promote lesion advancement .
Social, Behavioral, and Genetic Influences
Higher consumption of sugary drinks, older age, greater weight-for-age, fewer dental visits, higher baseline caries in children and caregivers, dental fatalism, and neighborhood disadvantage are all predictors of increased caries progression in children . Genetic factors, such as variants in the KLK4 gene involved in enamel formation, are also associated with different patterns of caries progression .
Conclusion
Dental caries progression is a complex process influenced by lesion activity and severity, tooth and surface type, microbial interactions, host responses, behavioral and social factors, and genetics. While most early lesions do not progress rapidly, certain risk factors and lesion characteristics significantly increase the likelihood of advancement, highlighting the importance of targeted prevention and early intervention strategies.
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