Daca avem dinti cu carii foarte mari, obturatii (plombe) foarte voluminoase, modificari de forma, pozitie, culoare, cel mai probabil va trebui sa “imbracam” acest dinte folosind o coroana dentara.
Acestea pot fi de mai multe feluri. Pentru dintii frontali (incisivi si canini) se pot face coroane de acrilat al caror principal avantaj, costul scazut, este depasit de multiplele dezavantaje: gama de culori limitata, transluciditate scazuta, culoarea se modifica in timp, rezistenta scazuta. Exista coroane de acrilat termopolimerizabil sau baropolimerizabil, acestea din urma fiind mai rezistente. Coroanele de acrilat ar trebui folosite numai ca si coroane provizorii pana in momentul in care este gata lucrarea protetica.
Un alt tip de coroana este cea din compozit, care fata de cea din acrilat are o rezistenta mai mare, o stabilitate coloristic mai buna, se toceste mai greu, dar are ca dezavantaj pretul mai ridicat. Este recomandata mai mult tot pe dintii frontali si mai putin in zonele laterale ale arcadei.
Coroanele de ceramica (portelan) au un aspect natural satisfacand cel mai bine cerintele estetice. Un aspect deloc de neglijat e faptul ca sunt foarte bine tolerate de gingie. Nu se tocesc si nu isi schimba culoarea. Paleta coloristica este mult mai larga. De obicei, ceramica se pune pe un suport metalic, dar pot fi facute si coroane integral ceramice, ca estetica mult mai asemanatoare cu dintele natural. Coroanele de ceramica pot fi utilizate atat in zona frontala, cat si in cea laterala a arcadei dentare.
Un ultim tip de coroana e cel de tip semifizionomic, adica metal cu fateta. Fatetele pot fi din acrilat sau compozit. Pot fi utilizate pentru dintii frontali si laterali.
Dr. Andrei Tirpea
Medic dentist
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