Steps in placement of maxillary first premolar

Placement of the maxillary first premolar in all three planes

The buccal cusp tip of the maxillary first premolar is in contact with occlusal plane (black line), and palatal cusp 1 mm short of the occlusal plane

buccal cusp corresponds with the canine tip, and
the palatal cusp corresponds to previous drawn reference line of the mandibular residual ridge line

When viewed from:
Front: Long axis parallel towards the vertical axis.
Side: Long axis parallel towards the vertical axis.
Occlusal plane: Buccal cusp is in contact with occlusal plane
and palatal cusp 1 mm short of occlusal plane

Steps in placement of the maxillary second premolar

Placement of the maxillary second premolar in all three planes

The buccal surface of the maxillary second premolar is barely visible when the patient smiles when viewed from the front

The buccal cusp of the maxillary second premolar corresponds with the buccal cusp of maxillary first premolar (blue line), and the palatal cusps of both the premolars correspond to the previous drawn line

When viewed from:
Front: Long axis parallel towards the vertical axis.
Side: Long axis parallel towards the vertical axis.
Occlusal plane: Both buccal cusp and palatal cusp is in contact
with occlusal plane

Steps in placement of maxillary first molar

Placement of the maxillary first premolar in all three planes

the mesio- and distobuccal cusps correspond with
the buccal cusp of second premolar (blue line) and the mesio- and distopalatal cusps correspond to the previous drawn line (yellow line).

When viewed from:
Front: Long axis slopes buccally.
Side: Long axis slopes distally.
Occlusal plane: Only mesiopalatal cusp is in contact with
occlusal plane

Steps in placement of maxillary second molar

The long axis of the maxillary second molar (blue line) is distally
inclined in relation to the vertical axis (red line) when viewed from the front .

All the cusps are short of the occlusal plane (black line).

The maxillary second molar is slightly buccally inclined when viewed from the front. The buccal surface of the maxillary second molar is barely visible when viewed from the front

When viewed from:
Front: Long axis slopes buccally more steeply than first molar.
Side: Long axis slopes distally more steeply than first molar.
Occlusal plane: Only mesiopalatal cusp is nearest to occlusal
plane

Source – S. Lakshmi preclinical manual of prosthodontics