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Fig. 6 | BMC Oral Health

Fig. 6

From: Three-dimensional analysis of the relationship between mandibular retromolar space and positional traits of third molars in non-hyperdivergent adults

Fig. 6

The classification criterion of Pell&Gregory. A Depth of Pell&Gregory Classification. PG-A: The highest part of the M3 was on the same level or higher than the occlusion plane of the second molar. PG-B: The highest part of the M3 is below the occlusal plane of the second molar, but higher than the neck of the second molar. PG-C: The highest position of the M3 is below the neck of the second molar. B Ramus relationship of Pell&Gregory Classification. PG-I: Sufficient space available between the anterior border of the ascending ramus and distal side of second molar to accommodate mesiodistal width of the crown of the M3. PG-II: The space available between the anterior border of the ramus and the distal side of the second molar is less than the mesiodistal width of the crown of the M3. PG-III: All or most of the M3 is embedded in the mandibular ramus

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BMC Oral Health

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