Fig. 3

a Pre-operative clinical images with acrylic stent images with acrylic stent in place to measure the PPD, CAL in the region of distobuccal [7(7) mm] aspect of 47. b Preoperative RVG with intrabony defect in relation to distal aspect of 47. c Full thickness flap elevated in relation to 45, 46, 47 with simplified papilla preservation in relation to distal of 47 showing two wall defect from the CEJ to the base of the defect in relation to distobuccal aspect of 47 = 6mm. d Root conditioning done with tetracycline in relation to 47. e Defect site grafted with B-ostin HT(HA60 %:BTCP40 %) and (f) collagen membrane placed over the grafted area in relation to 47. g External vertical mattress suturing done with 4 − 0 vicryl sutures. h Immediate post-operative digital intra oral radiograph showing complete defect fill in relation to distal aspect of 47. i Six months post-operative clinical images with acrylic stent in place to measure the PPD, CAL in the region of distobuccal [2(3) mm] aspect of 47. j Six months post-operative digital intra oral radiograph in relation to distal aspect of 47 showing complete defect fill