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Perioperative Antimicrobial Prophylaxis for Invasive Dental Procedures: A Systematic Review and Random-Effects
Alberto A Iturbe Cordero1, Arturo P Jaramillo2, Jhanmarie Vasquez3
1General Dentistry, Universidad Central de Venezuela, Caracas, VEN.
Cureus
|February 5, 2026
Summary
Routine prophylactic antimicrobials before dental procedures do not consistently show benefits in reducing infections or bacteremia. This practice may disrupt the oral microbiome and promote antimicrobial resistance, warranting careful consideration of patient risk.
Area of Science:
- Oral microbiome research
- Infectious disease epidemiology
- Dental surgery outcomes
Background:
- Prophylactic antimicrobials are common before invasive dental procedures to prevent infections and bacteremia.
- However, their clinical benefit is debated, with concerns about ecological disruption and antimicrobial resistance.
- Even single doses can alter the oral microbiome and select for resistant strains.
Purpose of the Study:
- To systematically review and meta-analyze randomized controlled trials on prophylactic antimicrobials in invasive dental procedures.
- To evaluate the efficacy of perioperative prophylaxis in reducing early infectious complications and bacteremia.
- To assess secondary outcomes like postoperative morbidity and the impact on oral flora.
Main Methods:
- A PRISMA-guided systematic review of PubMed, Embase, and Cochrane databases.
- Included 10 randomized placebo-controlled trials involving ~1,950 participants.
- Meta-analysis used an inverse-variance random-effects model to pool outcomes.
Main Results:
- Prophylaxis did not significantly reduce the primary endpoint of early infectious outcomes/bacteremia across all procedures (MD -0.12, 95%CI -0.31 to 0.07).
- Subgroup analyses for dental surgery also showed no significant benefit (MD -0.17, 95%CI -0.45 to 0.11).
- Some trials indicated reductions in bacteremia with specific agents (chlorhexidine, amoxicillin-clavulanate), but antibiotics did not improve outcomes in diabetic patients and increased analgesic use.
Conclusions:
- Routine prophylactic antimicrobial strategies in invasive dental procedures lack consistent overall benefit for early infectious/bacteremia outcomes.
- No clear improvement in secondary postoperative morbidity was observed.
- Microbiological evidence suggests potential harm through ecological disturbance and resistance selection; future trials need standardized endpoints and risk stratification.
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