The assessment of the effect of the size of lateral-antrostomy in graftless balloon elevation of the maxillary sinus membrane with simultaneous implant placement (a randomized controlled clinical trial).

BACKGROUND: The overlying maxillary sinus frequently restrains the height of the posterior maxillary bones. PURPOSE: Evaluating the effect of downsizing the antrostomy side-window on the stability of the installed implants and vertical bone gain, after employing a graftless antral membrane balloon elevation (AMBE). MATERIALS AND METHODS: The study is a randomized controlled clinical trial conducted on 20 patients with 30 deficient maxillary alveolar ridges underwent graftless (AMBE) after being allocated into a (5 mm) entry antrostomy group (the test group) and a (10 mm) entry antrostomy group (the control group) implementing a radiographic linear bone height and implant stability quotations (ISQ) comparison among both groups immediately after the placement of 38 Implants and 6 months after. RESULTS: Radiographic bone gain of the test group (5.55 +/- 0.93 mm) was significantly higher than the control group (2.86 +/- 0.60 mm) (p <0.001). There was no significant difference in primary stability between the test (65 +/- 5.32) and control groups (62.67 +/- 4.46) (p = 0.202); while the test group (73.43 +/- 4.39) showed significantly higher secondary stability than the control group (64.83 +/- 6.05) (p <0.001). ISQ values recorded at 6 months were significantly higher than those recorded at insertion in the test group (p <0.001), while they were insignificant in the control group (p = 0.148). CONCLUSION: Undersizing the antrostomy window deemed beneficial concerning the vertical bone gain and the simultaneously placed root form dental implants' secondary stability.