https://www.rpcendo.com/vItPfwcx/PDF3.pdf

Enterococcus faecalis: Its Role in Root Canal Treatment Failure and Current Concepts in Retreatment

http://www.endoexperience.com/filecabinet/Endo%20Related%20Restorative%20Dentistry/Post%20and%20Cores/scwartz%20post%20review%20article.pdf

Post placement and restoration of endodontically treated teeth: a literature review.

Clinical Implications and Microbiology of Bacterial Persistence after Treatment Procedures

PinheiroET,GomesBPFA,FerrazCCR,SousaELR,TeixeiraFB,Souza-FilhoFJ. Microorganismsfromcanalsofroot-filledteethwithperiapicallesions.InternationalEndodonticJour-nal,36,1^11,2003. AimTheobjectiveofthepresentstudywastoidentifythe microbial £orawithin root canals of teethwithfailedroot-canaltreatmentandtodeterminetheasso-ciationofthevariousspecieswithclinicalfeatures.MethodologySixtyroot-¢lledteethwithpersistingperiapicallesionswereselectedforthisstudy.Duringnonsurgical endodontic re-treatment, the root-¢llingmaterialwasremovedandthecanalsweresampled.Microbial sampling, isolationand species determina-tionwere performed usingadvanced microbiologicaltechniques for anaerobic species. The association ofmicrobiological ¢ndings with clinical features wasinvestigated.ResultsMicroorganisms were recovered from 51teeth.Inmostcases,oneortwostrainspercanalwerefound. Of the microbial species isolated,57.4% werefacultativeanaerobicspeciesand83.3%Gram-positivemicroorganisms.Enterococcus faecalis was the mostfrequentlyrecoveredbacterialspecies.Obligateanae-robesaccountedfor42.6%ofthespeciesandthemostfrequently isolated genera was Peptostreptococcus ,which was associated with clinical symptoms(P < 0.01).Signi¢cantassociationswerealsoobservedbetween:(a)painorhistoryofpainandpolymicrobialinfections or anaerobes (P < 0.05); (b) tenderness topercussion and Prevotella intermedia/P. nigrescens(P < 0.05); (c) sinusand Streptococcus spp.(P < 0.001)orActinomyces spp.(P < 0.01);(d)coronallyunsealedteethandStreptococcusspp.orCandidaspp.(bothwithP < 0.01).ConclusionThemicrobial£oraincanalsafterfail-ure of root-canal treatment were limited to a smallnumber of predominantly Gram-positive microbialspecies. Facultative anaerobes, especially E. faecalis ,were the most commonly isolated microorganisms,however,polymicrobial infectionsandobligate anae-robeswerefrequentlyfoundincanalsofsymptomaticroot-¢lledteeth.Keywords:endodontic failure, microbiology, root-canaltherapy.

http://www.orocentro.com.br/files/file-252063267.pdf

Microorganisms from canals of root-filled teeth with periapical lesions.

http://www.saudident.com/album/data/media/10/An_Evaluation_of_Microbial_Leakage_in_Roots_Filled.pdf

An evaluation of microbial leakage in roots filled with a thermoplastic synthetic polymer-based root canal filling material (Resilon).

The purpose of this study was to evaluate the relationship of the quality of the coronal restoration and of the root canal obturation on the radiographic periapical status of endodontically treated teeth. Full-mouth radiographs from randomly selected new patient folders at Temple University Dental School were examined. The first 1010 endodontically treated teeth restored with a permanent restoration were evaluated independently by two examiners. Post and core type restorations were excluded. According to a predetermined radiographic standard set of criteria, the technical quality of the root filling of each tooth was scored as either good (GE) or poor (PE), and the quality of the coronal restoration similarly good (GR) or poor (PR). The apical one-third of the root and surrounding structures were then evaluated radiographically and the periradicular status categorized as (a) absence of periradicular inflammation (API) or (b) presence of periradicular inflammation (PPI). The rate of API for all endodontically treated teeth was 61.07%. GR resulted in significantly more API cases than GE, 80% versus 75.7%. PR resulted in significantly more PPI cases than PE, 30.2% versus 48.6%. The combination of GR and GE had the highest API rate of 91.4%, significantly higher than PR and PE with a API rate of 18.1%.

H. A. Ray

Papers

Periapical status of endodontically treated teeth in relation to the technical quality of the root filling and the coronal restoration