Tehran University of Medical Sciences Iranian Journal of Public Health 2251-6085 49 5 2020 05 01 822 829 Haewon BYEON Department of Speech Language Pathology, College of Health Science, Honam University, Gwangju, Republic of Korea 2019 08 12 2019 10 13 Background: The evidence of transcranial direct current stimulation (tDCS) treatment effects on dementia is still insufficient. This study aimed to prove the scientific basis of tDCS by conducting a meta-analysis of previous studies that examined the effects of tDCS on the naming of patients with dementia. Methods: The literature search was conducted for publications published from Jan 2000 to Jun 2019 using four academic databases (PubMed, Web of Science, MEDLINE, and Cochrane Library). This study found 129 publications by searching academic databases according to the PRISMA protocol. Among them, irrelevant studies were excluded, and finally, 4 studies were meta-analyzed. Results: The score of the quality assessment on five studies ranged from 21 to 26 points, rated good or better. Meta-analysis results, tDCS had no significant effect on the improvement of naming ability of dementia. On the other hand, the effect size of the tDCS intervention + language/cognitive training was significant ‘large effect (SMD=0.72, 95% CI: 0.05, 1.39)’. Conclusion: This combination of tDCS and language/cognitive training significantly improved the naming ability of dementia patients. https://ijph.tums.ac.ir/index.php/ijph/article/view/18065 https://ijph.tums.ac.ir/index.php/ijph/article/download/18065/6904