A Conservative Approach for Replacing Missing Maxillary 2nd Premolar using Endodontically Treated Abutments

Abstract

In the past few years, several new all-ceramic systems have been introduced into the dental field offering good esthetics and simplified fabrication procedures. With these systems, it is possible to fabricate a variety of restorations. These all-ceramic restorations represent an interesting option to aesthetic restorative treatment of lost tooth structure and can be made by using a variety of fabrication techniques. However, in vitro and in vivo investigations of these systems should be undertaken before introducing them into routine clinical use. A total of 20 bridges were included in this study (n=20). Each bridge was fabricated on an endodontically treated maxillary 1st premolar and endodontically treated maxillary 1st molar abutment. Samples were divided into two main groups according to retainer design. Each group was subdivided into 2 subgroups depending on the ceramic material used, with bringing the total to four experimental groups (n=5). Group I (F): fiber post, composite core and full coverage retainers. Subgroup I (FLi): fiber post, composite core and full coverage retainers lithium disilicate bridge. Subgroup II (FZr): fiber post, composite core and full coverage retainer zirconium bridge. Group II (E): Endocrown-retained bridge: Subgroup Ш (ELi): Endocrown retainers lithium disilicate bridge. Subgroup IV (EZr): Endocrown retainers zirconium bridge. All endodontically treated teeth were prepared using a preparation Computerized Numerical Control (C.N.C) lathe-cut machine. All bridges