患者，男，35岁。<br /><img src="https://nimg.ppkao.com/2018-04/ppkaocom/20184111027354148.jpg?sign=5a041f1a53c26f7dbe507a49b10708e7&t=62d161dd">近中阻生，<br /><img src="https://nimg.ppkao.com/2018-04/ppkaocom/20184115649510293.jpg?sign=75aee5985928230d37029a6402b4440b&t=62d161dd">远中龋坏。施行<br /><img src="https://nimg.ppkao.com/2018-04/ppkaocom/20184110186663653.jpg?sign=65ae65b913850252b84f1460f84955a4&t=62d161dd">拔除术后4日，拔牙窝出现持续性疼痛并向耳颞部放射，查体见拔牙窝内空虚，有异味。要了解<br /><img src="https://nimg.ppkao.com/2018-04/ppkaocom/20184118724680480.jpg?sign=d803d6254e8053e78820886697d236c8&t=62d161dd">的龋坏程度，最佳的检查方法为（）。