POSITION OF THE THIRD MOLARS AND THEIR GERMS FOR DATA ORTOPANTOMOGRAM IN PATIENTS WITH DISTAL OCCLUSION
The main criterion is the stability of orthodontic treatment results. The approach to the issue of removal of domestic and foreign authors controversial. For many years there was a discussion about the impact of third molars on the results of orthodontic treatment.
On the one hand, we can not ignore the high rate of spread of caries among preschool and early school age, which leads to early loss of milk and permanent teeth, especially the first molars, when the question wisdom tooth removal during orthodontic treatment requires a special approach.
On the other hand, we know that 78% of people eruption of third molars associated with various complications of deсay periodontium. Some authors suggest that the removal of third molars retention favorably affect the outcome of orthodontic treatment retention. Today, we can consider the wisdom teeth not only as a factor that leads to relapse but in some cases they can be used in place of the destroyed and removed the teeth to enhance the efficiency of chewing. That is why each case requires individual clinical approach.
Availability of space for eruption of third molars in the mandible, usually maxillary molars guarantee provisions in the dental arch.
Almost always the position and size of the lower third molars is the key to the decision to remove them.
The aim of our study was to investigate Moesia-size distal third molars of the upper and lower jaws and determine the adequacy of space for normal eruption of lower third molars with distal occlusion.
Results. The presence of third molars on both jaws (or germs) were found in 81.08% of all patients, only the upper jaw - to 10.81%, only lower - 5.4%, the absence of third molars on both jaws was only one patient (2.7%). 62.16% in the third molars were in the 2-7 formation stage germ.
Average size of Moesia-distal upper third molars was 11.62 mm, women - 11.68 mm in men - 11.56 mm. The lower jaw Moesia medium-size on distal third molars was 13.4 mm, women - 13.11 mm in men - 13.68 mm.
Apart from gender difference, the average medial angle of inclination of the lower third molars was 20,1 °, which can be considered correct. In women, the figure was 21,45 °, men - 18,72 °. 2 patients (5.4%) found distal angle.
Pear-shaped distal distance between the surface of the second molar to mandibular branches averaged 9.85 mm. In women, the figure was 10.61 mm in men - 9.08 mm. That is, the average amount of Moesia-distal lower third molars 13.4 mm, pear-shaped average distance equal to 9.85 mm.
Conclusions. Thus, most patients with distal occlusion in a period of permanent teeth available third molars (or germs) on both jaws - at 81.08%. This fact requires detailed attention to individual treatment strategy in each individual patient.
Moesia-distal dimensions of the upper third molars - 11,62 mm lower third molars - 13.4 mm, 1.78 mm greater than the size of the upper molars. For the clinician with experience is very positive fact in the case of eruption of lower third molars, giving prospects with timely early orthodontic treatment, that is, in the first half of alternating occlusion, when you can stimulate the growth of the mandible.
However, in the period of permanent occlusion, should it in a variable bite did not start orthodontic treatment room for eruption of lower third molars not an average of 1.55 mm, which proves once again that the beginning of the treatment of distal occlusion should be at an early age and purpose it should stimulate growth of the mandible opportunities for further eruption of lower third molars, as a guarantor of stability of orthodontic treatment.
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