Facial Bones and Radiography

How many bones make up the facial skeleton?

14 bones.

Which two facial bones are unpaired?

The vomer and the mandible.

What are the four processes of the maxilla?

Frontal, Zygomatic, Alveolar, and Palatine processes.

What anatomical structure houses the lacrimal sac?

The lacrimal fossa of the lacrimal bone.

How many teeth are present in full deciduous versus permanent dentition?

Deciduous has 20 teeth; permanent has 32 teeth.

What anatomical landmarks define the Radiographic Base Line (RBL)?

The outer canthus of the eye and the external auditory meatus (EAM).

What landmarks define the Anthropologic Base Line (ABL)?

The infraorbital margin and the superior portion of the EAM.

Where does the central ray emerge in an OccipitoMental (OM) view?

At the level of the infraorbital margin.

How does the central ray angle differ between an OM and an OM30 view?

OM30 adds a 30° caudal angulation emerging at the acanthion.