Changes in Morphometric and Densitometric Indices of the Mandible at Different Stages of Lower Third Molars Eruption in Connective Tissue Dysplasia

. The aim was to study the morphometric changes of permanent teeth and bone in the lateral mandible in normal and in connective tissue dysplasia (CTD). Materials and Methods. The study included 327 women who were divided into two groups (with DST, without DST) and five age subgroups (14-17, 18-21, 22-26, 27-31, 32-36 years). All participants were diagnosed with connective tissue dysplasia, radiologic examination, photodensitometry, crown modulus, average modulus of the molar row, mandibular morphotype, morphometric landmarks of mandibular variability, and its angular characteristics were determined. Results. The pronounced morphological changes in the lateral mandible in the group with DST are associated with an increase in the total mass of the crown part and an increase in the average module of the third molars, in the group without DST due to the massiveness of the crown part of the first and second molars and an increase in their average module. Morphometric indices of the mandible demonstrate multifaceted and multistage variability of bone structure during antenatal and postnatal exposure to aggressive factors on remodeling, blood supply, and innervation, which in turn negatively affects the maturation and eruption of teeth of the upper and lower jaws. Conclusions. Connective tissue dysplasia causes pronounced changes in morphometric parameters in the lateral section of the mandible, including due to high variability of the lower third molars, which has a key impact on the formation of a harmonious microenvironment and the possibility of proper eruption of such teeth.