Rezin Simanlar
Özet
Günümüzde estetiğe olan beklentinin artmasıyla geleneksel simanların yetersiz kalması, yüksek sertlik, mekanik dayanıklılık, adezyon kabiliyeti ve estetik üstünlükleri nedeniyle indirekt restorasyonlarda sıklıkla tercih edilen rezin simanların geliştirilmesini sağlamıştır. Bu simanların yapısını organik polimer matriks, inorganik doldurucular, bağlayıcı silan ajanları ile polimerizasyon başlatıcı ve hızlandırıcıları oluşturmaktadır. Rezin simanlar, diş yüzeyine uygulanan adeziv sistemlerine göre Etch&Rinse, Self Etch ve post-operatif hassasiyeti azaltan Self Adeziv olmak üzere üç ana gruba ayrılır. Polimerizasyon yöntemlerine göre ise kimyasal olarak polimerize olanlar (oto-polimerizan), ışıkla polimerize olanlar ve özellikle ışığın ulaşamadığı derin bölgelerde tam sertleşme sağlayan dual-cure (hem ışık hem kimyasal) tipleri mevcuttur. Rezin simanlar, geleneksel simanlara kıyasla tutuculuk, stabilite, gerilme kuvvetlerine direnç ve geniş renk skalası gibi belirgin avantajlara sahip olsalar da yüksek film kalınlığı, restorasyon sökümünün zor olması ve yüksek maliyet gibi dezavantajları da bulunmaktadır. Klinik başarıyı artırmak adına her diş hekiminin bu materyallerin özelliklerini ve tiplerini iyi bilerek doğru vakada doğru seçimi yapması büyük önem taşımaktadır.
With the increasing expectation for aesthetics today, conventional cements have become insufficient, leading to the development of resin cements, which are frequently preferred in indirect restorations due to their high hardness, mechanical durability, adhesion capacity, and aesthetic superiority. The structure of these cements consists of an organic polymer matrix, inorganic fillers, coupling silane agents, and polymerization initiators and accelerators. Resin cements are divided into three main groups according to the adhesive systems applied to the tooth surface: Etch&Rinse, Self Etch, and Self Adhesive, which reduces post-operative sensitivity. According to polymerization methods, there are chemically polymerized (auto-polymerizing), light-polymerized, and dual-cure (both light and chemical) types that ensure complete curing especially in deep areas where light cannot reach. Although resin cements have distinct advantages over conventional cements such as retention, stability, resistance to tensile forces, and a wide color range, they also have disadvantages including higher film thickness, difficulty in restoration removal, and high cost. In order to increase clinical success, it is of great importance for every dentist to know the properties and types of these materials well and make the right choice for the right case.
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