Cephalometrics is useful in assessing all of the following relationships except:
Cephalometric analysis
Cephalometric analysis is the process of evaluating skeletal, dental and soft tissue relationship of a patient by comparing measurements performed on the patient’s cephalometric tracing with population norms for respective measurement(s), to come to a diagnosis of the patients’ orthodontic problem.
The cephalometric analysis essentially involves evaluation of the patient’s:

Skeletal pattern
Dentition and its pattern (denture pattern)
Soft tissue pattern of face
Nasopharyngeal airway
Growth trend.

Ref: Orthodontics: Diagnosis and Management of Malocclusion and Dentofacial Deformities, 3e, Om P. Kharbanda pdf no 973
Tooth to tooth
Bone to bone
Tooth to bone
Soft palate to gingiva