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A tiny bony defect is seen in the posterior wall of the right frontal sinus, on the right side of the crista galli, measuring 15 mm in diameter This tiny bony defect allows the contrast material to enter the right frontal sinus as seen on image #65, series #602 Less dense contrast material is seen filling the left frontal sinus1 J Periodontol 07 May;78(5)8 Favorable periodontal healing of 1wall infrabony defects after application of calcium phosphate cement wall alone or in combination with enamel matrix derivative a pilot study with canine mandibles Shirakata Y(1), Yoshimoto T, Goto H, Yonamine Y, Kadomatsu H, Miyamoto M, Nakamura T, Hayashi C, Izumi YAngular defects are classified on the basis of the number of osseous walls1 \ngular defects mas have one, two, or three walls digs 2315 to 2317) The number of walls in the apical portion of the defect may be greater than that in its occlusal portion, in which case the term combined osseous defect is used d ig 2318) Periodontal Disease W