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 Indian J Med Microbiol  
 

Figure 3 :Cross-sectional view at the middle third of a mandibular first premolar tooth showing reduced root thickness (0.5 mm) in relation to the mesial invagination. Root thickness distal to the canal is normal (1.6 mm). (M) Mesial surface, (D) Distal surface, (B) Buccal surface, (L) Lingual surface

Figure 3 :Cross-sectional view at the middle third of a mandibular first premolar tooth showing reduced root thickness (0.5 mm) in relation to the mesial invagination. Root thickness distal to the canal is normal (1.6 mm). (M) Mesial surface, (D) Distal surface, (B) Buccal surface, (L) Lingual surface