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ePaper created 2015-11-17, 15:11:47 | version 1.38.0
The volume of the augmented area had been retained,andaradiopaquelinesimilartothatof cortical bone was observed at the newly formed floor of the maxillary sinus (Fig. 6h, blue arrows). Discussion CBCT has changed the possibilities of implant dentistry, especially in bone augmentation techniques. Its low radiation dose makes it possible to evaluate the augmented area longi- tudinally with images taken in the same direc- tion. In this study, postoperative swelling of the maxillary sinus membrane was evaluated using CBCT at five stages. However, the radia- tion dose should be restricted eventhoughthat of CBCT is very low. Therefore, selection of the CBCT device and the parameters to be used was very important to avoid the harmful influence of radiationonthepatients’health. The postoperative swelling of the maxillary sinusmembrane,whichoccurredoneweekafter the sinus floor augmentation, was an unknown biologicalreaction.Itoccurredinall132sitesand disappeared spontaneously in 96.2% three months after surgery. In a monkey model,4, 5 in- flammatorycellinfiltrationwasidentifiedunder- neath the epithelial layer ofthe sinus membrane four days after sinus floor augmentation. At 20 daysaftersurgery,thesinusmucosapresenteda normal aspect with inflammatory infiltration of limited size. Thus, this temporary postoperative swelling of the sinus membrane was due to mechanical stimulation from elevation of the sinus membrane during sinus floor augmenta- tion. Almost all of the patients reported no Volume 1 | Issue 1/2015 31Journal of Oral Science & Rehabilitation C om pli cati o ns af te r si nu s f lo o r au gme ntati o n Figs. 5a–f Figs. 5a–f (a) The area to be augmented was filled with β-TCP granules. (b) The lateral window was completely covered with two pieces of resorbable membrane. (c) A sagittal CBCT slice image taken on the day of surgery. (d) A volume-rendered image taken on the day of surgery. (e) A sagittal CBCT slice image taken one week after surgery. Type 2 swelling of the maxillary sinus membrane had occurred. (f) A volume-rendered image taken one week after surgery. The β-TCP granules had migrated toward the buccal side from all directions (blue arrows). Table 1 Lateral window coverage and migration of β-TCP granules (n = 132). Group 1 Group 2 Not completely covered Completely covered Sites 18 sites 114 sites Type A 7 sites (38.9%) 110 sites (96.5%) Type B 8 sites (44.4%) 1 site (0.9%) Type C 3 sites (16.7%) 3 sites (2.6%) Table 1 a d e f b c