الفهرس 
Assessment of the effect of the antrostomy size in graftless lateral maxillary sinus floor elevation using ambe (antral membrane balloon elevation) with simultaneous implant placement
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Abstract
The present study is a randomized clinical trial to evaluate the effect of the size of antrostomy in non-grafting lateral sinus lift with simultaneous implant placement on the bone formation and secondary stability of the implants. Eleven patients (with 14 operating sites) seeking implant rehabilitation for the atrophic posterior maxillary ridge were selected from the outpatient clinic of the Oral and Maxillofacial Surgery Department, Faculty of Dentistry,Cairo University. Patients were divided in to two equal groups; (group A), lateral sinus floor elevation by Antral Membrane Balloon Elevation ”AMBE’ through small antrostomy with simultaneous implant placement in 7 patients with atrophied posterior maxilla, (group B), lateral sinus floor elevation by Antral Membrane Balloon Elevation AMBE through large antrostomy with simultaneous implant placement in 7 patients with atrophied posterior maxilla with total The bone gain has been measured by using linear measurement of CBCT while secondary stability by OSTELL based on the concept resonance frequency analysis. Statistical analysis showed that both groups showed increase in alveolar bone height but the highest mean value was found in small antrostomy group (mean=5.55), while the lowest mean value was found in large antrostomy group (mean= 2.86).While the implant stability after 6 months of surgical procedure, the highest mean value was found in small antrostomy group (mean=73.43), while the lowest mean value was found in large antrostomy group (mean=64.83)