Cephalometric analysis MCQ | MDS Entrance Preparations

Cephalometric analysis are used to evaluate growth changes by superimposing on:

A.    Sella-nasion plane             

B. Mandibular plane
C.    F-H plane                          
D. Occlusal plane

    Ans. (A) Sella-nasion plane:  “Sella-nasion plane/SN planerepresents the anterior cranial base. The growth of anterior cranial base is completed much earlier compared to facial structures so the SN plane is taken as most stable area to compare the growth changes of facial structure and jaws” The following lines form Proffit will explain the answer: Cranial base superimposition, allows the relationship of maxilla and mandible to the cranium to be evaluated. In general the most useful approach is to superimpose on the SNP line, registering the template over the patients tracing at nasion rather than sella if there is difference in cranial base length.