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 Indian J Med Microbiol  
 

Figure 3: The lateral sinus wall and the Schneiderian membrane are perforated (black arrow) with a small (∅= 2.1 mm) round burr. The perforation is located about the level of the first maxillary molar and 20-25 mm superior of the alveolar crest

Figure 3: The lateral sinus wall and the Schneiderian membrane are perforated (black arrow) with a small (∅= 2.1 mm) round burr. The perforation is located about the level of the first maxillary molar and 20-25 mm superior of the alveolar crest