Orthodontics — Key differences for NEET MDS
SNA = 82 degrees maxilla position relative to cranial base. SNB = 80 degrees mandible position relative to cranial base. ANB = 2 degrees skeletal relationship Class I. ANB greater than 4 = Class II skeletal. ANB less than 0 = Class III skeletal. Wits appraisal when ANB unreliable. Tweed triangle = FMA FMIA IMPA. Steiner analysis = SNA SNB ANB.
📖 Read full notes →Most common relapse = lower anterior crowding. Bonded retainer = permanent fixed retainer. Hawley retainer = removable with labial bow. Circumferential supracrestal fiberotomy prevents rotational relapse. Vacuum formed retainer = Essix = clear overlay. Relapse causes: late mandibular growth, soft tissue pressure, periodontal fiber recoil.
📖 Read full notes →NEET MDS frequently tests the ability to differentiate between related topics. Understanding the key differences between Cephalometric Analysis and Retention & Relapse in Orthodontics is crucial for scoring well. Questions may test diagnostic features, treatment approaches, or characteristic findings.