INBDE (Integrated National Board Dental Examination) Practice Exam

Miller Mobility Class 2 indicates that the gingival margin has is mobile, but not more than 1mm when perturbed.

Option A is incorrect because normal gingival margin should not be mobile at all. Option B is incorrect because it refers to "slightly more than normal", which is not a defined characteristic for Miller Mobility Class. Option D specifies an extent of >1mm, which is more than the maximum limit for Class 2. Therefore, the correct characteristic for Miller Mobility Class 2 is option C, <1mm.