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CONDITION OF GUMS DURING LONG-TERM USE
OF FIXED BRIDGES
Aliyeva Mavludaxon Tursunaliyevna
Assistant Professor at CAMU Medical University
Dental prostheses cause changes in the acid-base balance of saliva. Solid-cast
prostheses without a titanium nitride protective-decorative coating have the least effect
on it (pH 7.2±0.03, starting from the 12th month after prosthetics and until the end of
the study). Metal-ceramic prostheses have a slight effect (pH 7.39±0.02 starting from
the 12th month after prosthetics and until the end of the study). Stamped-soldered
bridge prostheses without a titanium nitride protective-decorative coating have a
greater impact on the acid-base balance of saliva than other tested prostheses (by the
36th month after prosthetics, pH 6.85±0.05 mmol/L; control - 7.22±0.03). Solid-cast
prostheses have a minimal effect on the periodontal tissues of supporting teeth (Russel
index after 36 months of prosthetics was 0.66±0.03; control - 0.5±0.02). Metal-ceramic
and solid-cast prostheses with a titanium nitride protective-decorative coating have a
slight effect on periodontal tissues (Russel index after 36 months of prosthetics was
0.64±0.04 and 0.67±0.04, respectively). Non-soldered stamped crowns and stamped-
soldered bridge prostheses without and with a titanium nitride protective-decorative
coating have a greater impact on the periodontium of supporting teeth than other tested
constructions (Russel index after 36 months of prosthetics was 1.19±0.03; 1.21±0.04;
1.19±0.05 and 1.23±0.07, respectively).
The smallest operational changes after 36 months of prosthetics were found in
patients with metal-ceramic and solid-cast prostheses without a titanium nitride
protective-decorative coating. Solid-cast prostheses with a titanium nitride protective-
decorative coating do not have extensive changes in color and surface gloss; however,
focal color changes were detected in 34.3% of cases. In patients with stamped crowns
and stamped-soldered bridge prostheses with a titanium nitride protective-decorative
coating, focal changes in color and surface gloss of the prostheses were 27% and 32.7%
of cases, respectively, and extensive changes for each type of the aforementioned
prostheses were found in 16.2% of cases.
Soldering the parts of a bridge prosthesis increases their wear. After 36 months of
prosthetics, in the groups of patients with stamped-soldered bridge prostheses with and
without a titanium nitride protective-decorative coating, the occurrence of pores,
pitting, and erosion on the metal surface of the prostheses was noted in 16.1% and
21.6% of cases, respectively, while the absence of the above-mentioned changes was
observed in all other studied groups. The titanium nitride protective-decorative coating
of metal prostheses prevents significant changes in the concentration of mineral
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elements and the pH of saliva only in the first 6 months after prosthetics. This coating
is unstable (already 6 months after prosthetics, in patients with stamped crowns with a
titanium nitride protective-decorative coating, stamped-soldered bridge prostheses
with a titanium nitride protective-decorative coating, and solid-cast prostheses with a
titanium nitride protective-decorative coating, its abrasion on the occlusal surfaces is
observed in 19%, 16.2%, and 11.4% of cases, respectively, and by the end of the study,
the absence of the coating was noted in 43.2%, 49.1%, and 34.3% of cases). It
negatively affects periodontal tissues (the PMA index in patients with stamped crowns
with a titanium nitride protective-decorative coating and stamped-soldered bridge
prostheses with a titanium nitride protective-decorative coating by the end of the study
is 55.37±0.27% and 59.74±0.75%, respectively), negatively affects the metal structure
of prostheses, and contributes to the development of intolerance to them (in patients
with stamped-soldered bridge prostheses with a titanium nitride protective-decorative
coating by the end of the study in 8.1% of cases).
