Abstract
Background: A thickening of the sinus mucosa is observed after sinus floor augmentation. The objective of this retrospective study was to evaluate the influence of the presence of septa in the dimensional variation and ostium involvement over time of the Schneiderian mucosa after sinus floor augmentation. Materials and Methods: Fifteen sinuses with septa (septa group) and 15 without (control group) were selected. CBCTs taken before surgery, and were analyzed after 1 week and after 9 months. Schneiderian membrane thickness changes over time and involvement of the ostium were evaluated. Results: Four perforations occurred in the septa group and none in the control group. After 1 week of healing, the sinus mucosa thickness increased in height by 5.7 mm and 7.1 mm in the septa and control groups, respectively. In this period, the patency of the ostium decreased in both groups, and three infundibula were obstructed in the septa group, and five in the control group. The mucosa was thicker and the edema was closer to the ostium in the control compared to in the septa group. After 9 months of healing, the dimensions regressed to normal pattern and no obstruction of the infundibula were observed. No statistically significant differences were found between septa and control groups. Conclusions: after one week of healing, the sinus mucosa increased in dimensions in both septa and control groups. However, the sinus mucosa presented a tendency of being thicker and closer to the ostium, resulting in a higher number of infundibula obstructions, in the control group compared to in the septa group. After 9 months, the sinus mucosa regressed to normal dimensions and no obstructions of the infundibula were observed in any group.
Highlights
Introduction iationsMaxillary sinus floor elevation is nowadays considered a safe and effective surgical technique to allow the prosthetic restauration supported by implants in an atrophic posterior region of the maxilla [1]
An additional analysis of the same set of data was performed with the following inclusion criteria: (i) treated for sinus floor elevation with a lateral access; (ii) presence of septa that might interfere with the surgery within the maxillary sinus; (iii) availability of good quality cone beam computed tomographies (CBCTs) before surgery (T0), and after 1 week (T1w) and 9 months (T9m)
The following assessments were performed in the coronal view of the CBCTs taken at T0: (i) the distance between the maxillary sinus ostium (MSO) and the sinus floor; (ii) the MSO diameter; (iii) the infundibulum length; (iv) the number of infundibula out of patency; (v) the sinus mucosa thickness [21]
Summary
Maxillary sinus floor elevation is nowadays considered a safe and effective surgical technique to allow the prosthetic restauration supported by implants in an atrophic posterior region of the maxilla [1]. The distance between the palatal-nasal recess (PNR) and the floor of the sinus, as well as the angle formed between the palatal and nasal walls in this region, may influence the prognosis. A thickening of the sinus mucosa is observed after sinus floor augmentation The objective of this retrospective study was to evaluate the influence of the presence of septa in the dimensional variation and ostium involvement over time of the Schneiderian mucosa after sinus floor augmentation. Results: Four perforations occurred in the septa group and none in the control group
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