Introduction:
Dental caries, often known as tooth decay or cavities, is one of today's most prevalent
non-communicable and pervasive conditions (Mayoclinic, 2022) affecting both the primary and
the permanent dentition. It is a multifactorial illness caused by a complex interplay of
environmental factors. The disease is characterized by demineralization of the hard tissues of the
tooth, leading to cavitation and eventual destruction of the tooth structure ("Sugars and dental
caries," 2017). Dental caries is a significant public health concern, affecting people of all ages
and socioeconomic backgrounds worldwide. The prevalence of dental caries in children aged
between 4 years and 6 years was between 72.9% and 76.1% in Ajman with a DMFT range of 4.4
- 4.5 (Hennessy, 2021).
This research paper will provide an overview of the etiology, pathogenesis, morphological
changes, and clinical significance/functional derangement of dental caries.
Etiology
The etiology of dental caries is linked to several major factors. Tooth surface, diet, time and
microorganisms in the oral cavity should be considered as caries may develop if all these four
factors are present. Frequent and sustained consumption of carbohydrates (sucrose, fructose, and
glucose) with the presence of acidogenic and proteolytic microorganisms in the oral cavity,
creates an acidic plaque environment that encourages the demineralization of dental enamel. This
ultimately results in caries (Struzycka, 2014).
A number of behavioral and social factors are also known to increase the risk of dental caries.
Age, since the enamel of deciduous teeth is more vulnerable to acid demineralization than
permanent teeth, Bad oral hygiene and decreased salivary flow (such as in the case of
Xerostomia) or inadequate buffering capacity. Additionally, the tooth alignment varies from
person to person. Misaligned teeth can create obstacles when it comes to cleaning the teeth,
making these individuals more susceptible to caries. Certain tooth surfaces are more prone to
caries. For instance, molars and premolars often have a high risk to develop caries because they
have a lot of pits, grooves and multiple roots that can collect food particles (Hennessy, 2021).
Moreover, there is evidence to suggest that genetic factors may play a role in the susceptibility to
dental caries. Several genes involved in enamel formation have been associated with an
increased risk of dental caries. Variations in these genes may result in defects in enamel structure
and composition, making teeth more susceptible to acid demineralization and caries (Wright,
2020).
, Pathogenesis
Despite the fact that the oral cavity contains a wide variety of bacteria, only a few species are
capable of causing dental caries and periodontal infection. The bacterium Streptococcus Mutans
has a central role in the progression of dental caries. It is a gram-positive, anaerobic round
bacterium (coccus) where its primary habitat is the human oral cavity, especially dental plaque
which forms a biofilm on all surfaces of the tooth. Streptococcus Mutans can aid in the
establishment of dental caries where they can change the local environment by producing EPS
and lowering the pH, creating a favorable habitat for acidogenic and aciduric bacteria such as
Lactobacillus (Struzycka, 2014). These bacteria ferment dietary carbohydrates, especially
sucrose, producing acid that lowers the pH of the oral environment. When the pH drops below a
critical level of 5.5, the hydroxyapatite crystals in the tooth enamel dissolve, leading to
demineralization. The acid produced by bacteria can also attack the dentin and pulp, leading to
pulpitis and periapical inflammation (Struzycka, 2014).
Morphological Changes
Dental caries can cause a range of morphological changes in
the tooth structure, from early white spot lesions to
extensive cavitation and pulp involvement. The
morphological changes that occur in dental caries can be
divided into three stages: incipient, moderate, and advanced.
Each stage is characterized by specific changes in the
morphology of the tooth structure.
1) The incipient stage of dental caries is the earliest stage of
tooth decay, where the carious lesion is limited to the enamel,
which is the hard, outermost layer of the tooth. The first sign
of incipient caries is the appearance of white spots on the
enamel surface, which are the result of the loss of mineral content from the enamel. These spots
may be visible to the naked eye or may require the use of special instruments to detect them. The
white spots may appear chalky or opaque and are usually found on the smooth surfaces of the
teeth. As the caries lesion progresses in the incipient stage, the white spots may become more
pronounced, and the surface of the enamel may become rough to the touch. Furthermore, the loss
of mineral content from the enamel makes the tooth more vulnerable to further decay and may
eventually lead to the formation of a cavity (Sherwood Dental, 2020).
Despite the changes in the morphology of the tooth structure, the incipient stage of dental caries
is still reversible. Through the utilization of fluoride or other remineralizing agents, the enamel
can be remineralized, and the caries lesion can be stopped from progressing, and possibly
Dental caries, often known as tooth decay or cavities, is one of today's most prevalent
non-communicable and pervasive conditions (Mayoclinic, 2022) affecting both the primary and
the permanent dentition. It is a multifactorial illness caused by a complex interplay of
environmental factors. The disease is characterized by demineralization of the hard tissues of the
tooth, leading to cavitation and eventual destruction of the tooth structure ("Sugars and dental
caries," 2017). Dental caries is a significant public health concern, affecting people of all ages
and socioeconomic backgrounds worldwide. The prevalence of dental caries in children aged
between 4 years and 6 years was between 72.9% and 76.1% in Ajman with a DMFT range of 4.4
- 4.5 (Hennessy, 2021).
This research paper will provide an overview of the etiology, pathogenesis, morphological
changes, and clinical significance/functional derangement of dental caries.
Etiology
The etiology of dental caries is linked to several major factors. Tooth surface, diet, time and
microorganisms in the oral cavity should be considered as caries may develop if all these four
factors are present. Frequent and sustained consumption of carbohydrates (sucrose, fructose, and
glucose) with the presence of acidogenic and proteolytic microorganisms in the oral cavity,
creates an acidic plaque environment that encourages the demineralization of dental enamel. This
ultimately results in caries (Struzycka, 2014).
A number of behavioral and social factors are also known to increase the risk of dental caries.
Age, since the enamel of deciduous teeth is more vulnerable to acid demineralization than
permanent teeth, Bad oral hygiene and decreased salivary flow (such as in the case of
Xerostomia) or inadequate buffering capacity. Additionally, the tooth alignment varies from
person to person. Misaligned teeth can create obstacles when it comes to cleaning the teeth,
making these individuals more susceptible to caries. Certain tooth surfaces are more prone to
caries. For instance, molars and premolars often have a high risk to develop caries because they
have a lot of pits, grooves and multiple roots that can collect food particles (Hennessy, 2021).
Moreover, there is evidence to suggest that genetic factors may play a role in the susceptibility to
dental caries. Several genes involved in enamel formation have been associated with an
increased risk of dental caries. Variations in these genes may result in defects in enamel structure
and composition, making teeth more susceptible to acid demineralization and caries (Wright,
2020).
, Pathogenesis
Despite the fact that the oral cavity contains a wide variety of bacteria, only a few species are
capable of causing dental caries and periodontal infection. The bacterium Streptococcus Mutans
has a central role in the progression of dental caries. It is a gram-positive, anaerobic round
bacterium (coccus) where its primary habitat is the human oral cavity, especially dental plaque
which forms a biofilm on all surfaces of the tooth. Streptococcus Mutans can aid in the
establishment of dental caries where they can change the local environment by producing EPS
and lowering the pH, creating a favorable habitat for acidogenic and aciduric bacteria such as
Lactobacillus (Struzycka, 2014). These bacteria ferment dietary carbohydrates, especially
sucrose, producing acid that lowers the pH of the oral environment. When the pH drops below a
critical level of 5.5, the hydroxyapatite crystals in the tooth enamel dissolve, leading to
demineralization. The acid produced by bacteria can also attack the dentin and pulp, leading to
pulpitis and periapical inflammation (Struzycka, 2014).
Morphological Changes
Dental caries can cause a range of morphological changes in
the tooth structure, from early white spot lesions to
extensive cavitation and pulp involvement. The
morphological changes that occur in dental caries can be
divided into three stages: incipient, moderate, and advanced.
Each stage is characterized by specific changes in the
morphology of the tooth structure.
1) The incipient stage of dental caries is the earliest stage of
tooth decay, where the carious lesion is limited to the enamel,
which is the hard, outermost layer of the tooth. The first sign
of incipient caries is the appearance of white spots on the
enamel surface, which are the result of the loss of mineral content from the enamel. These spots
may be visible to the naked eye or may require the use of special instruments to detect them. The
white spots may appear chalky or opaque and are usually found on the smooth surfaces of the
teeth. As the caries lesion progresses in the incipient stage, the white spots may become more
pronounced, and the surface of the enamel may become rough to the touch. Furthermore, the loss
of mineral content from the enamel makes the tooth more vulnerable to further decay and may
eventually lead to the formation of a cavity (Sherwood Dental, 2020).
Despite the changes in the morphology of the tooth structure, the incipient stage of dental caries
is still reversible. Through the utilization of fluoride or other remineralizing agents, the enamel
can be remineralized, and the caries lesion can be stopped from progressing, and possibly
