Abstract This crossover study aimed to compare the anesthetic effects of buffered 2% articaine with 1:200,000 epinephrine with that of non-buffered 4% articaine with 1:200,000 epinephrine. Forty-seven volunteers were administered two doses of anesthesia in the buccal region of the second mandibular molars in two sessions using 1.8 mL of different local anesthetic solutions. The onset time and duration of pulp anesthesia, soft tissue pressure pain threshold, and the score of pain on puncture and burning during injection were evaluated. The operator, volunteers, and statistician were blinded. There were no significant differences in the parameters: onset of soft tissue anesthesia (p = 0.80), duration of soft tissue anesthesia (p = 0.10), onset of pulpal anesthesia in the second (p = 0.28) and first molars (p = 0.45), duration of pulp anesthesia of the second (p = 0.60) and first molars (p = 0.30), pain during puncture (p = 0.82) and injection (p = 0.80). No significant adverse events were observed. Buffered 2% articaine with 1:200,000 epinephrine did not differ from non-buffered 4% articaine with 1:200,000 epinephrine considering anesthetic success, safety, onset, duration of anesthesia, and pain on injection.

RESUMO Introdução: Muitas falhas clínicas que envolvem o pino de fibra de vidro decorrem do descolamento entre o retentor, o canal radicular e o cimento. Assim, protocolos que reduzem a probabilidade dessas falhas são essenciais para a odontologia. Objetivo: Comparar a eficiência da desinfecção intracanal entre o álcool e clorexidina no contexto de minimização de fraturas. Métodos: A presente revisão sistemática registrada no PROSPERO sob o protocolo CRD42021233516 usou a estratégia baseada nos Medical Subject Headings: “((Endodontics OR Root Canal Filling Materials OR Dental Materials) AND Chlorhexidine AND Ethanol AND Dental Bonding)” nos buscadores PubMed, Scopus, Web of Science, Cochrane Library, Embase e Lilacs. Foram incluídos estudos em português, inglês ou espanhol, sem restrições quanto a sua metodologia e ano de publicação. Excluiu-se artigos que não relataram um protocolo de higiene intracanal antes do procedimento, sem publicação na íntegra e pesquisas ortodônticas. Resultados: Foram selecionados 6 estudos de acordo com os critérios de inclusão e exclusão. Em todos utilizou-se a clorexidina para limpeza intracanal, comparando com os demais grupos, e em 4 houve a comparação dela com álcool e outros agrupamentos. Discussão: Os artigos utilizaram diferentes meios e tempos de armazenamento e a maioria fez o uso de dentes bovinos. Não verificou-se uma diferença significativa entre quaisquer substâncias quanto ao aumento da adesividade do conjunto. Conclusão: Não existe diferença entre o uso do álcool ou clorexidina como método de desinfecção, entretanto, um protocolo prévio deve ser estabelecido para uma maior longevidade de tratamento.

ABSTRACT 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.