[Influence of some social factors and unhealthy habits upon the incidence of periodontal diseases among the population of the town of Kazanlak].
D009910:Oral Hygiene; D010510:Periodontal Diseases / Q000453:epidemiology; D012959:Socioeconomic Factors
Vliianic na niakoi sotsialno-bitori fakori i vredni navitsi vurkhu chestotata na parodontlnitc zaboliavaniia vsred nasclenicto na gr. Kazanluk.