Now onto the answers for the November 2013 Locate the Object using the SLOB (Same-Lingual, Opposite-Buccal) rule.
SLOB (Same-Lingual, Opposite-Buccal)
1) Pick an object with a known fixed location = second premolar.
2) Determine which direction we are moving from the premolar periapical radiograph to the molar periapical radiograph = distal.
3) Determine what direction the unknown radiopaque entity (A) appears to have moved in relation to the second premolar = mesial. (moving from the premolar periapical to the molar periapical radiograph).
4) Use the acronym. The unknown object moved in the OPPOSITE direction as the radiograph. The acronym states that opposite is buccal, so the radiopaque entity (A) is to the buccal of the second premolar.
1) Pick an object with a known fixed location = first premolar.
2) Determine which direction we are moving from the premolar periapical radiograph to the canine periapical radiograph = mesial.
3) Determine what direction the supernumerary tooth (A) appears to have moved in relation to the first premolar = mesial. (moving from the premolar periapical to the canine periapical radiograph).
4) Use the acronym. The unknown object moved in the SAME direction as the radiograph. The acronym states that same is lingual, so the supernumerary tooth (A) is to the lingual of the first premolar.
Another case will be coming next month. If you have any questions or comments, please leave them below. Thanks and enjoy!