Sides of teeth
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Summary
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Some studies suggest that the right and left sides of the dental arch are symmetrically shaped with slight crowding, while other studies indicate variations in caries incidence and dentine properties between sides.
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Symmetry and Differences in Dental Arch and Tooth Sides
Symmetry in Dental Arch Dimensions
Research on the symmetry of dental arches has shown that there is generally a high degree of symmetry between the right and left sides of the dental arch. A study involving 80 sets of maxillary and mandibular models from a British population found that the dimensions of the teeth and dental arches were largely symmetrical, with only slight variations. This symmetry is crucial for maintaining proper occlusion and overall dental health.
Bilateral Symmetry in Dental Caries
Several studies have investigated the incidence of dental caries on the right and left sides of the mouth. The consensus is that caries tend to occur bilaterally, meaning that if a tooth on one side of the mouth is affected, the corresponding tooth on the opposite side is likely to be affected as well . This bilateral symmetry has been observed in various studies, which noted that the anatomical structure and position of tooth surfaces play significant roles in caries incidence .
Tooth Development and Symmetry
Tooth development also exhibits a high degree of symmetry. A study that developed a scoring system to assess the symmetry of tooth development in mixed dentition found that differences between the two sides of the jaw were minimal. This symmetry is essential for diagnosing and treating developmental disorders that may affect one side of the jaw more than the other.
Mechanical Properties of Dentine
The mechanical properties of dentine, such as hardness and elastic modulus, can vary between different sides of the tooth. Research has shown that coronal dentine tends to be harder on the lingual side, while root dentine is harder on the buccal side. These variations, although subtle, suggest that the mechanical properties of dentine are adapted to the functional demands placed on different parts of the tooth.
Chemical Composition and Microstructure
The chemical composition and microstructure of teeth also differ between the lingual and vestibular sides. Studies using Raman MicroSpectroscopy and Scanning Electron Microscopy have identified differences in the mineral and elemental composition of these sides, which could influence the choice of materials and strategies in restorative dentistry. These differences are important for developing targeted treatments that consider the unique properties of each side of the tooth.
Alveolar Bone Changes During Orthodontic Treatment
Orthodontic treatment can lead to changes in the alveolar bone surrounding the teeth. A systematic review and meta-analysis found that both labial and lingual movements of anterior teeth during orthodontic treatment resulted in vertical bone loss, with significant reductions in bone thickness at the cervical level. These findings highlight the importance of monitoring bone changes to prevent adverse effects during orthodontic procedures.
Influence of Gender and Ethnicity on Tooth Dimensions
The dimensions of the maxillary central incisor (MCI) can be influenced by factors such as gender and ethnicity. A meta-analysis revealed that while there were no significant differences between the left and right sides, gender and ethnicity did affect the width, length, and width-to-length ratio of the MCI. These insights are valuable for dental treatment planning, especially in the esthetic zone.
Dental Arch Parameters in Canine Ectopia
In cases of unilateral palatally displaced canine (PDC), the dental arch parameters can differ between the displacement side (DS) and the nondisplacement side (NDS). Research has shown that the transverse width and palatal area are larger on the DS, although tooth size remains comparable between both sides. These findings are important for understanding the implications of PDC on dental arch development and planning appropriate interventions.
Conclusion
Overall, the research indicates a high degree of symmetry in dental arch dimensions, caries incidence, and tooth development. However, subtle differences in mechanical properties, chemical composition, and responses to orthodontic treatment highlight the complexity of dental anatomy and the need for personalized approaches in dental care. Understanding these nuances can lead to better diagnostic, preventive, and therapeutic strategies in dentistry.
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