Evaluation of enamel surface and bond strength depending on the etching duration - an in vitro study - Qilerxhiu G., Kjurchieva Chuchkova G., Gavrilovikj I., Demjaha M., Kiseri Kubati J., Bajraktarova Mishevska C. (Maced Dent Review 2021; 44 (1): 19-24, 2021)