EVALUATION OF THE ACCURACY OF FIXING THE CENTRAL RATIO OF THE JAWS DEPENDING ON THE REGISTRATION METHOD
DOI:
https://doi.org/10.35220/2523-420X/2024.2.10Keywords:
TMJ, central jaws relation, central occlusion, reference position, articulator, virtual articulator, wax plate, Aluwax, jig, leaf calibrator, gnathometer, condylographyAbstract
The central ratio of the Jaws is one of the most controversial issues in dentistry. There are even dozens of definitions of this term in the professional literature. It is also known about a considerable number of methods and techniques for fixing it, each of which has its own characteristics, advantages and disadvantages. At the same time, the search and registration of the position of the lower jaw, which could be used as a starting point for orthopedic or orthodontic treatment, is perhaps the most urgent problem. The purpose of this study. Analyze the accuracy of fixing the central shelep ratio using the most well-known clinical methods. Materials and methods. The study group included 10 patients aged 25 to 65 years, equally male and female, who were diagnosed with digital condylography. The distribution of patients according to the ratio of dentition rows according to Engle classification was as follows: 3 patients had the 1st Class, 1-the 2nd Class of the 1st subclass, 4-the 2nd Class of the 2nd subclass, and 2 belonged to the 3rd Class. Models of the upper jaw were cast to the Gamma Reference SL articulator using a condylograph and a kinematic facial Arch in the true articulated axis of the joints. Registration of the central ratio based on electronic condylography data was used as a control. Conclusions. In all the studied patients, a displacement of the jaw was detected under the influence of occlusion from the state of the central ratio, and the Delta can vary individually and exceed 1 mm. The accuracy of recording the central ratio depends on the chosen technique, as well as on the type of ratio of the patient’s jaws. There is no universal way to register the central ratio; its choice should be based on the specific clinical situation and individual characteristics of each patient. The data obtained can be useful for choosing the optimal method for recording the central jaw ratio in a specific clinical setting.
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