部位、发生率黄色、绿色和桔色着色是由于菌斑内产色细菌的作用再加上口腔卫生不良(Sutcliffe 1967),这种着色最常见于儿童,主要位于上颌牙颊面(Leung 1950)。乳牙列也常见到位于龈缘的黑色或深棕色薄膜,此深色 Occurrences The yellow, green and orange coloration is due to the role of chromogenic bacteria in the plaque plus poor oral hygiene (Sutcliffe 1967). This coloring is most commonly seen in children, primarily in the maxillary buccal surface (Leung 1950) . The deciduous dentition also commonly found in the gingival margin of the dark or dark brown film, this dark