Comparison between the use of alcohol and chlorhexidine in the intracanal disinfection protocol before the installation of fiberglass pin related to the increase in adhesiveness: a systematic literature review

Introduction: Many clinical failures involving the fiberglass post result from the detachment between the retainer, the root canal and the cement. Thus, the connections that cause a probability of these failures are essential for dentistry. Objective: To compare the efficiency of intracanal disinfection between alcohol and chlorhexidine in the context of minimizing fractures. Methods: The present systematic review registered in PROSPERO under the protocol CRD42021233516 based on a Medical Subject Headings strategy: “((Endodontics OR Root Canal Filling Materials OR Dental Materials) AND Chlorhexidine AND Ethanol AND Dental Bonding)” in the search engines PubMed, Scopus, Web of Science, Cochrane Library, Embase and Lilacs. Studies in Portuguese, English or Spanish were included, without restrictions regarding their methodology and year of publication. Articles that did not report an intracanal hygiene protocol before the procedure, without full publication and orthodontic research were excluded. Results: Six studies were selected according to the inclusion and exclusion criteria. In all, chlorhexidine was used for intracanal cleaning, comparing it with the other groups, and in 4 it was compared with alcohol and other groups. Discussion: The articles used different media and storage times and most used bovine teeth. There was no significant difference between any other characteristics regarding the increase in adhesiveness of the set. Conclusion: There is no difference between the use of alcohol or chlorhexidine as a disinfection method. However, a previous protocol must be established for longer treatment longevity.