Skip to content
Osler PressEdu
Log inStart free
✕›M0 part 2 of 8English한국어2 of 13Exit lesson
M0 part 2 of 8 · Orientation

Anatomy in 3D

Find the tooth, its five surfaces and its layers before any module asks you to cut. Peel the gum and enamel and turn on the cross-section.

Loading 3D view…

  1. Universal numbering Permanent teeth are numbered 1 to 32: tooth 1 is the maxillary right third molar, the count goes along the upper teeth to the left, then from 17 back along the lower teeth to the right.
  2. #3 and #30 #3 is the maxillary right first molar, the tooth the crown sheet is written for. #30 is the mandibular right first molar, the molar this model shows.
  3. Neighbors #29 and #31 The adjacent-tooth checkpoint is about them: #29 in front of #30, #31 behind it.
  4. Five surfaces Occlusal (chewing), buccal (cheek), lingual (tongue), mesial (toward the midline) and distal (away from it). Each axial wall is named by its surface.
  5. Enamel, dentin, pulp Peel the layers: enamel on the outside, dentin under it, the pulp in the middle. The occlusal reduction is read through these layers.
  6. Cervical finish line Where the crown will end, near the gum. Its width is the margin checkpoint.
3D model: molar30.glb: teeth #29–#31, jaw bone and gum. BodyParts3D, © 2008 Life Science Integrated Database Center (DBCLS); modified by Osler Press. CC BY-SA 2.1 JP · source
3D viewer code. three.js authors. MIT · source
BackNext: step 1
English한국어
✕M0 · Orientation2/13
Anatomy in 3D

Find the tooth, its five surfaces and its layers before any module asks you to cut. Peel the gum and enamel and turn on the cross-section.

Loading 3D view…

  1. Universal numbering Permanent teeth are numbered 1 to 32: tooth 1 is the maxillary right third molar, the count goes along the upper teeth to the left, then from 17 back along the lower teeth to the right.
  2. #3 and #30 #3 is the maxillary right first molar, the tooth the crown sheet is written for. #30 is the mandibular right first molar, the molar this model shows.
  3. Neighbors #29 and #31 The adjacent-tooth checkpoint is about them: #29 in front of #30, #31 behind it.
  4. Five surfaces Occlusal (chewing), buccal (cheek), lingual (tongue), mesial (toward the midline) and distal (away from it). Each axial wall is named by its surface.
  5. Enamel, dentin, pulp Peel the layers: enamel on the outside, dentin under it, the pulp in the middle. The occlusal reduction is read through these layers.
  6. Cervical finish line Where the crown will end, near the gum. Its width is the margin checkpoint.
3D model: molar30.glb: teeth #29–#31, jaw bone and gum. BodyParts3D, © 2008 Life Science Integrated Database Center (DBCLS); modified by Osler Press. CC BY-SA 2.1 JP · source
3D viewer code. three.js authors. MIT · source
Outline · 8 parts✓Criteria card2Anatomy in 3D3Steps1Find tooth #30 and tooth #32Name the five surfaces of #303Peel enamel, dentin and pulp4Read the five checkpoints on a finished prep5Photograph the prep on the grid card6Read your score band by band4Within vs outside5Check6Guided cut7Cut and score8Recall: day 3 and day 10

Practice feedback against the 2026–27 published crown-prep criteria (molar). Not an exam or admissions result; your program and examiners decide.

BackNext: step 1