In which of the following techniques may a patient be asked to hold the film packet during exposure

单项选择题对牙周炎患者，我们如选择曲面体层片，下列说法哪种不正确？

单项选择题牙骨质增生是由于增生的牙骨质沿牙根不断沉淀，使牙根________________

单项选择题牙内吸收的患牙髓腔____________，呈圆形或卵圆形或不规则形密度减低的透射影

单项选择题继发龋是指X线片上可显示在金属填充物的窝洞边缘，牙硬组织破坏形成密度______的不规则的窄缝，边缘常不光滑。

单项选择题X线检查对下列哪种牙髓病具有诊断价值？

单项选择题龋病是牙硬组织发生慢性进行性破坏的一种疾病，龋病按照进展情况分为_____

单项选择题下颌横断合片主要用于

单项选择题Which of the following imaging techniques does not use X rays

单项选择题Which of the following is considered to be an extraoral technique

单项选择题Which one of the following may appear on a periapical radiograph of the upper third molar area