PURPOSEThe purpose of this clinical study was to evaluate the frequency and type of prosthetic complications in relation to type and properties of removable dentures and to investigate the influence of these complications and several data about the existing dentures on patient satisfaction.MATERIALS AND METHODSNinety nine patients (44 males and 55 females) wearing removable dentures have been included in the study. The complications of the patients were recorded; patient satisfaction was determined with a Visual Analog Scale (VAS) and the relationship of complications and patient satisfaction with several data about the dentures such as denture age, type of denture, centric relation and vertical dimension was investigated. Kruskal Wallis, Mann Whitney U and Chi square tests were used for statistical analyses. The results were evaluated statistically at a significance level of P<.05.RESULTSNeed for addition of artificial teeth for dentures with correct centric relations was found to be significantly lower than dentures with wrong centric relations (P<.01). Loss of retention, ulcerations and high vertical dimension affected the VAS chewing ability scores negatively and ulcerations affected the VAS phonation scores negatively (P<.05).CONCLUSIONConsidering the results of this study, it can be concluded that loss of retention, ulcerations and high vertical dimension caused patient dissatisfaction. Additionally, dentures with wrong centric relations caused need for addition of artificial teeth.

Zirconia is used as a biomaterial due to its mechanical and chemical properties, and acceptaple aesthetic outcomes. Zirconia is used for crown and bridge restorations, implant abutments, implant material, endodontic posts, orthodontic brackets and primary material crown in telescopic attachment in dentistry.In this article, mechanical and physical properties of zirconia in dentistry is reviewed, CAD-CAM systems and a focus on the clinical use and cementation procedures in dental practice with recent research is discussed.

ÖZETDiş hekimliğinde restorasyonların estetik beklentilerin artması ve beraberinde CAD/CAM sistemlerinin geliştirilmesiyle estetik implant dayanaklar protetik tedavilerde kullanılmaya başlamıştır. Beklentilerin artması sebebiyle, implant tedavilerinin hem cerrahi hem de protetik tedavi seçenekleri üreticiler tarafından geniş bir alanda kullanımımıza sunulmaktadır. Titanyum ve diğer metal alaşım implant dayanaklar doku uyumu ve yeterli mekanik özelliklere sahip olmalarına rağmen diş etinde gri yansımalara neden olmakta ve protetik tedavinin başarısını olumsuz etkilemektedir. İstenilen tedavi sonucunun alınabilmesi için implant ve restorasyon çeşitliliğine uygun mekanik ve estetik beklentileri karşılayacak dayanak çeşitliliği de mevcuttur. Günümüzde metal alt yapılı restorasyonlardan uzaklaşılması, porselenin estetik özelliği ve biyouyumluluğu sebebiyle implant sistemlerinde de seramik dayanaklar kullanılmaya başlanmıştır. Titanyum dayanakların yüksek sağkalım oranı göstermesine rağmen, ön bölge implant üstü protetik tedavilerin estetik beklentiyi karşılayıp karşılamadığı da tedavi başarısını doğrudan etkilemektedir. Anahtar Kelimeler: Estetik dayanak, zirkonya dayanak, ön bölge. ABSTRACT Esthetic abutments and CAD/CAM systems began to be used in dental prosthetic treatments with increased esthetic expectations of restorations. Both surgical and prosthetic treatment options are presented in a wide range by the manufacturers. Titanium and other metal-alloy implant abutments have provided reliable and biocompatible substructures for implant/abutment-supported crowns. However, their gray metallic color often leads to gray or blue discolorations of the surrounding soft tissues. A variety of implants, abutments and restorations differing in design and biomaterials have been introduced to achieveoptimal mechanical, biological, and esthetic treatment outcomes. In recent years; ceramic abutments are used commonly in implant supported prosthetic treatments due to their biocompatability and esthetic proporties. Despite the high survival rates of titanium abutments, the esthetic outcome should also be considered as a success factor, especially in the anterior esthetic zone.