Abstract
Materials used in additive techniques are initially in a plastic state to be inserted into different cavities or easily molded (a blunt, for example), after which they pass into a rigid phase. This process is carried out by various methods depending on the material nature. The process can be purely physical (solidifying the alloy melt, the termoplasticized macromolecular compounds), modification and rearrangement of the internal structure (sintering of ceramic masses, crystallization of glasses, amalgam intake), a process of evaporation of some components (lacquers, plasticizing polymers) or a chemical process. This latter process can be an acid-base reaction between two inorganic substances (PCZ, CIS cements), a chelating reaction (ZOE cements) between a phenolic range (organic compound, usually eugenol or orthoethoxybenzoic acid) and an inorganic powder (ZnO) or a reaction in which a macromolecular compound is formed. After the type of the reaction, the macromolecules are classified into polymers (the formation reaction is called polymerization, the compounds of which are obtained by monomers, the main chain is formed by the carbon atom only), polycondensates (the formation reaction is called polycondensation, the chain also formed from heteroatom-ON, depending on the type of material) or substances that are obtained by polyaddition ( a repeated addition, the mechanism being different from the polymerization. Our study was conducted in the Dental Clinic and comprises a total of 17 patients. The group was represented by patients aged 50-85 years. Clinical observations have been made on cases of fracture of acrylic bases, with the analysis and assessment of some clinical aspects with increased risk of fracture (jaw / mandible, median / paramedian fracture line, etc.), which increase the risk to and fracture when associated. Clinical observations have shown the presence of the risk of fracture in acrylic prostheses, with the need first of all for the proper design and realization of mobile prostheses, but also for the use of inserts.
Highlights
IOAN SARBU1, CRISTIAN ADRIAN DINU2*, CRISTIAN CONSTANTIN BUDACU3, MIHAELA GABRIELA LUCA4, CONSTANTIN MIHAI3, CAMELIA ANA GRIGORE2, DANA TUTUNARU2
Materials used in additive techniques are initially in a plastic state to be inserted into different cavities or molded, after which they pass into a rigid phase
After the type of the reaction, the macromolecules are classified into polymers, polycondensates or substances that are obtained by polyaddition
Summary
IOAN SARBU1, CRISTIAN ADRIAN DINU2*, CRISTIAN CONSTANTIN BUDACU3 , MIHAELA GABRIELA LUCA4, CONSTANTIN MIHAI3, CAMELIA ANA GRIGORE2, DANA TUTUNARU2. If the balance of monomer and polymer is not observed, there are a number of inconveniences: the recovery of the acrylic mass shrinkage coefficient, the high percentage of residual monomer, which has toxic action on the tissues, the appearance of the pores both in the thickness of the plate and the saddles, as well as on the surface, with negative effects on mechanical resistance, hygiene and chromatic appearance, the excess of polymer causes the following: reduces plasticity, impedes the introduction of the paste into the pattern, the unevenness of the chromatic appearance of the prosthesis, the low mechanical strength.
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