Jae-Hong Lee*

Periodontology, Daejeon Dental Hospital, Institute of Wonkwang Dental Research, Wonkwang University College of Dentistry, Daejeon, Korea, South

Background: Horizontal and vertical alveolar bone defects caused by severe alveolar ridge atrophy, periodontitis, or other traumatic sequelae may interfere with or inhibit functional and esthetic implant reconstruction. Therefore, resolution and augmentation of peri-implant defects are a major prerequisite for successful implant placement and ideal subsequent restoration.

Aim/Hypothesis: To retrospectively evaluate whether guided bone regeneration (GBR) with L- and I-shaped demineralized bovine bone mineral with 10% collagen (DBBM-C) differs from GBR with DBBM in terms of augmentation stability and early wound healing outcomes in peri-implant dehiscence defects.

Material and Methods: A total of 91 peri-implant defects were grafted with 24 L- (GBR-L), 22 I- (GBR-I)-shaped DBBM-C, and 45 DBBM (GBR-P). Cone-beam computed tomography images were obtained after surgery and at 5 months follow-up. The horizontal thickness (HT0, HT2, HT4), vertical thickness (VT), and VT at 45° angle (45-VT) of the augmented hard tissue were measured. Early postoperative discomfort and wound healing outcomes were assessed 2 weeks after surgery, and periotest values were also measured at 5 months in all groups.

Results: At 5 months follow-up, the change at HT0 and VT of the GBR-L (HT0: −0.63 ± 0.55 mm, VT: −0.77 ± 0.60 mm) and GBR-I (HT0: −0.68 ± 0.53 mm, VT: −0.91 ± 0.73 mm) groups was significantly more stable than that of the GBR-P (HT0: −1.30 ± 0.77 mm, VT: −1.57 ± 0.67 mm) group (P < .05). The GBR-L group (-0.74 ± 0.54 mm) showed better augmentation stability than the other two groups at the change at 45-VT. Early postoperative discomfort, wound healing outcomes, and periotest values did not differ significantly among the three groups.

Conclusion and Clinical implications: Within the limitations of this study, L- and I-shaped DBBM-Cs used for GBR were more beneficial in terms of horizontal augmentation stability than DBBM after a 5-month healing period.

Disclosure of Interest: None Declared.

Keywords: bone graft, dental implants, guided bone regeneration