Salivary biomarkers of cellular damage and oxidative stress following of lower third molar surgical removal

Layani Bertaglia Dias, Thaline Teixeira Tonzar, Damaris Raíssa dos Santos, Rayne Oliveira Souza, Tayná Buffulin Ribas, Leonardo de Freitas Silva, Erik Neiva Ribeiro de Carvalho Reis, Daniela Ponzoni, Rita Cássia Menegati Dornelles, Ana Cláudia de Melo Stevanato Nakamune, Antonio Hernandes Chaves-Neto


Background: The aims of this study were the temporal analysis of salivary biomarkers of cellular damage and oxidative stress following of lower third molar surgical removal from healthy patient and without postoperative complications. Material and Methods: Three whole unstimulated saliva samples were collected from each of 17 patients (8 men, 9 women) before surgery, 1 and 7 days after lower third molar surgical removal using the expectoration (or 'spit') method. Salivary flow rate (SFR), pH, buffer capacity (BC) were measured, immediately after collection. The samples were centrifuged and the supernatants were stored in aliquots at -80°C until analysis. Salivary thiobarbituric reacting substances (TBARs), total antioxidant capacity (TAC), haemoglobin (Hb), total protein (TP), uric acid (UA), acid phosphatase (ACP), tartrate-resistant acid phosphatase (TRAP), alkaline phosphatase (ALP), aspartate aminotransferase (AST), alanine aminotransferase (ALT), and lactate dehydrogenase (LDH)  were measured by spectrophotometric method.  Results: There were no significant differences between pre- and post-surgical SFR, pH, BC, or TP. One day after extraction were detected a significant increases in Hb, TBARs, ACP, TRAP, ALP, AST, ALT, and LDH activities, and decreases of UA and TAC levels were observed. Seven days after extraction, only AST (higher) remained increased compared to pre-surgical levels. Conclusions: The surgical removal of impacted lower third molars increases salivary biomarkers of cellular damage and oxidative stress, and decreases the TAC in the early postoperative. Considering these issues, our data open new perspectives of a possible use of these parameters as biomarkers for screening and monitoring of patients vulnerable to the development of postoperative complications.

Descriptors: Saliva; Biomarkers; Oral Surgical Procedures; Oxidative Stress; Enzymes; Thiobarbituric Acid Reactive Substances.


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