Abscessed primary teeth Child Child, Preschool Dental Pulp Cavity Female Fusobacterium nucleatum Humans Male Microarray Analysis Molar Periodontal Abscess Prevotella intermedia Tooth, Deciduous Treponema denticola child deciduous tooth dental pulp cavity female human isolation and purification male microarray analysis microbiology molar tooth oral bacteria periodontal abscess preschool child