Analysis of composite restorations functioning success under different cavity configuration parameters
DOI:
https://doi.org/10.11603/2311-9624.2019.3.10570Keywords:
success of restoration, prognosis of functioning, cavity configurationAbstract
Summary. The prognosis of direct composite restorations functioning implies the necessity to take into account the influence of a number of acting factors, which are associated both with the specificity of the cavity design and the quality of the materials used, and with the peculiarities of polymerization mechanism and conversion of monomers under the conditions of different direct restorative techniques used for tooth defect filling.
The aim of the study – to analyze the success of composite restorations functioning under the conditions of different parameters of the cavity configuration and to evaluate the influence of derivative size parameters of hard dental tissues defects on the clinical prognosis of their filling effectiveness.
Materials and Methods. During the realization of the study objective, 49 prepared carious cavities were filled among dental patients, with 27 cavities corresponding to I class of Black classification (I group, C-factor – 5), and 22 cavities corresponding to II class of Black classification (II group, C-factor – 2). The cavities were filled using the universal nanohybrid material Filtek Z550 (3M). The clinical success of the restorations after 12 months of functioning was performed in accordance to USPHS criteria. The volume of the restoration was determined using UP200 (UP3D Tech Co., PRC) extraoral scanner.
Results and Discussion. Analysis of the obtained numerical results helped to found out that in the conditions of the Black’s Class II cavity, which corresponds to mesial-(distal) occlusal type with values of the C-factor equals 2, an increase in the volume parameters of the restoration over a one third of the tooth crown volume provokes a decrease of clinical prognosis of the restoration functioning. In the conditions of the I Class defect according to Black, an increase in the restoration volume due to the simultaneous exceeding of the parameters of its depth more than the half of the total enamel and dentine thickness to the roof of the pulp chamber, and the increase of the length and width of the filling more than 2/3 of the geometric parameters of the tooth crown without breaking the marginal edges of the tooth enamel, also provokes a statistically significant decrease in the quality of restorations compared to the data recorded during lower initial cavity geometrical parameters.
Conclusions. The volumetric parameters of the restoration were found to be more clinically relevant for the prediction of their functional performance compare to the C-factor values during the filling of Black’s Class I and II defects with the use of universal nano-hybrid composite material during the 1-year of monitoring period.
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