Sitotoksisitas Obat Kumur Propolis Heterotrigona itama Terhadap Sel Makrofag Peritoneal Tikus Muda Yang Diinfeksi Bakteri Porphyromonas gingivalis: Pengamatan Mikroskopis (in vitro) = Cytotoxicity of Heterotrigona itama Propolis Mouthwash on Peritoneal Macrophages of Young Mouse Infected by Porphyromonas gingivalis: Microscopic Observation (in vitro)