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ePaper created 2016-03-31, 16:35:38 | version 1.38.0
fibre post restorations literature review | 27roots1 2016 ries of some of the more recent relevant studies sup- porting the notion of reinforcement by using fibre posts. D’Arcangelo et al.59 studied the fracture resis- tance and deflection of teeth restored with a fibre post and prepared for veneers. Seventy-five hu- man maxillary central incisors with similar ana- tomiccrownswereincluded:nopreparation,veneer preparation,endodonticaccessfilledwithcompos- ite, endodontic access with composite and veneer preparation, and fibre post placement (RTD Endo LightPost)followedbyveneerpreparation.Allspec- imens were thermo-cycled and submitted to frac- ture strength tests by using a displacement mea- surementsystem.Preparationforveneersincreased thedeflectionvaluesofthespecimens,butthefibre reinforced post restoration with veneer prepara- tions did not show statistically significant differ- ences from the intact unprepared incisor. When investigating the fracture resistance and failure mode of premolars restored with composite resin and various prefabricated posts, Hajizadeh et al.1 utilised 60 extracted teeth with four subgroups: no cavity preparation, endodontics with an MOD andnopost,endodonticswithaDTLightPost(RTD) and MOD, and the last group with endodontics, Fil- post (Filhol Dental, UK) and an MOD composite res- toration. The teeth restored with the DT Light Post and composite were as strong as the control (the unprepared tooth) and stronger than those teeth restored with composite alone without a post, and those restored with a titanium post and composite. In the DT Light Post group, 86 % of the fractures were ‘restorable’, which was much higher than any oftheotherthreegroups.Accordingtotheauthors, ‘There is growing evidence that fibre posts provide the additional benefit of increased fracture resis- tance’. The effect of placing fibre posts under zirconia- ceramiccrownswasstudiedbySalamehetal.60 Ninety mandibular second molars were divided into three test groups, representing various extents of coronal damage,endodonticallyaccessedandobturatedwith warm vertical condensation. Half of the specimens were restored with composite, the other half with a translucent FRC post (Rely-X Fiber Post, 3M ESPE) with a composite core. The insertion of the fibre post improvedthesupportunderthezirconiacrowns,which resultedinhigherfractureloadsandfavourablefailure typecomparedtoacompositecorebuild-up. Maccari et al.61 utilised 30 single rooted endodon- tically treated teeth to evaluate the fracture resis- tance of different prefabricated aesthetic posts. In- cludedinthestudywereAestheti-Post(RTD),FibreKor Post(JenericPentron)andCosmoPost(aceramicpost systemfromIvoclarVivadent).Theysummarisedthat themeanfractureresistanceoftheglassfibreprefab- ricatedaestheticpostsprovedahigherfractureresis- tancethantheceramicpost,whichwaslessthanone half of the fibre posts. The fracture resistance and failure pattern of end- odontically treated maxillary incisors restored with composite resin, with and without fibre reinforced composite posts under different types of full cover- agecrowns,wasstudiedbySalamehetal.62 Onehun- dred and twenty maxillary incisors were endodonti- cally treated and divided into four groups of 30 each and further divided into two subgroups of resto- rationwithorwithoutafibrepost(PostecPlus,Ivoclar Vivadent). Restorations placed were PFM, Empress II, SR Adoro crowns and Cercon crowns, with all preparations including a 2 mm ferrule. Fracture tests showed that the type of crown was not a significant factor affecting the fracture resistance, but the pres- ence of a post was. Fig.6a:The common aesthetic failure when using metallic posts with discoloration of the tooth structure,as well as the gingival collar. (Courtesy of Dr Frank Milnar) Fig.6b:The result of placing a light transmitting fibre post with a translucent ceramic. (Courtesy of Dr Frank Milnar) Fig.6a Fig.6b