Temporary non-removable orthopedic structures are made using a CAD/CAM system by the milling method, as an alternative to permanent ones for a long time

Abstract

Relevance. Prevalence of partial loss of teeth in the population of Ukraine is from 62.3% to 84.5%. The war in Ukraine significantly affected the provision of timely and high-quality dental care. However, the restoration of the destroyed crown part of the tooth and the integrity of the tooth rows must take place in a timely manner, as it leads to the development of secondary deformations of the dental and jaw system. One of the options for solving the problem of timely orthopedic treatment, in these conditions, can be the use of temporary fixed orthopedic structures made using the CAD/CAM system by the milling method.

The aim is to investigate the possibility of using non-removable temporary orthopedic structures made using the CAD/ CAM system by the milling method and cements for their temporary fixation for a period exceeding that established by the general protocols of orthopedic treatment and declared by the manufacturer.

Materials and methods. The study was conducted in the period from September 2022 to April 2024 at the Department of Orthopedic Stomatology of the National Medical University named after O.O. Bogomolets For the study, 60 patients aged 25-59 years were selected, with the destruction of the crown part of the tooth, which required replacement with a fixed orthopedic structure and included dentition defects of various lengths. All supporting elements were divided into groups, depending on the cement used for fixation: Group I – Freegenol (GC, Japan), Group II – Provicol (Voco, Germany), Group III – RelyX Temp NE (3M ESPE, Germany), IV group – Temp-Bond NE (KERR, USA). Re-examinations of patients were carried out in periods from two weeks to six months.

Results. Depending on the selected cement for temporary fixation of a non-removable orthopedic structure, the percentage of decementing of temporary single crowns, in terms of two weeks to six months, was from 2.22% to 32.65%, structures with support on two elements from 5.55% to 52.94% and based on three elements from 7.14% to 77.78%. A direct relationship was established between the appearance of mobility of the temporry fixed orthopedic structure, the sensitivity of the vital tooth and bleeding gums in all groups of subjects.

Conclusions. Temporary non-removable orthopedic structures made using the CAD/CAM system by the milling method, depending on the selected cement for temporary fixation, can be used to restore the crown part of the tooth and included defects of the dentition for a perio  that exceeds that established by the general protocols of orthopedic treatment and declared by the manufacturer.

Keywords: temporary non-removable orthopedic structures, CAD/CAM systems, milling, cements for temporary fixation.