Tomographic evaluation of the influence of the placement of a collagen membrane subjacent to the sinus mucosa during maxillary sinus floor augmentation: a randomized clinical trial

Abstract

Aim To study the influence of a collagen membrane placed subjacent to the sinus mucosa on the dimensional changes of augmented maxillary sinus floor. Methods Twenty patients were recruited in the study and randomly assigned to two groups. After the elevation of the maxillary sinus mucosa, a collagen membrane with standardized dimensions was placed at the test sites subjacent to the sinus mucosa and the elevated space was filled with a xenograft, both at test and control sites. A collagen membrane was then used to cover the antrostomy at both sites, and sutures were applied to close the wounds. Cone beam computed tomographies (CBCTs) were taken for all patients before surgery (T0), after 1 week from sinus floor augmentation (T1), and after 9 months of healing (T2). Dimensional changes over time of soft and hard tissues were evaluated on the CBCTs. Results After 1 week of healing, the sinus floor was elevated by 10.0 ± 2.8 mm and 10.6 ± 2.5 mm at the no-membrane and membrane groups, respectively. After 9 months of healing, a similar reduction of the height was observed in both groups, providing a total vertical augmentation of 8.6 ± 2.8 mm at the no-membrane sites and 9.1 ± 3.1 mm at the membrane sites. After 9 months of healing, the hard tissues subjacent to the sinus mucosa appeared to be partially corticalized in three patients in the no-membrane group and in six patients in the membrane group. Conclusions The use of collagen membranes subjacent to the sinus mucosa did not influence the dimensional variations of the augmented regions and the clinical outcomes after 9 months of healing also in absence of perforations.

Maxillary sinus augmentation with three different biomaterials: Histological, histomorphometric, clinical, and patient‐reported outcomes from a randomized controlled trial

“…A voxel size of 0.125 mm, with a set of the parameters to 8.0 mA, 80 kV, and an exposure time of 12 to 18 seconds were applied. CBCT radiographic measurements were carried out by GD following the protocol described in a series of studies in order to standardize the procedure 13‐16 . All the enrolled patients received 2 g of amoxicillin and clavulanic acid (or 600 mg. of clindamycin for those who were allergic to penicillins) as a premedication 1 hour before surgery.…”

Influence of Anatomical Parameters on the Dimensions of the Subantral Space and Sinus Mucosa Thickening after Sinus Floor Elevation. A Retrospective Cone Beam Computed Tomography Study

“…Suggestions on what to measure and how to take measurements on CBCT images have been provided in several studies [2,[9][10][11][12]. The use of the base of the nasal floor as a reference plane was adopted for both bi-dimensional [10,11,13,14] and 3-dimensional [15] evaluations. That axis delimits the lower region of the sinus where the implant will be inserted.…”

Involvement of the maxillary sinus ostium (MSO) in the edematous processes after sinus floor augmentation: a cone-beam computed tomographic study

“…Nevertheless, the bleeding within the elevated space and the inflammatory phenomena (edema) associated with these procedures result in a transient additional elevation of the Schneiderian membrane besides that obtained with the filler material [4][5][6][7][8][9][10][11]. The detachment of the sinus mucosa from its bed, together with the edema and bleeding that follows the surgical intervention, also carries a risk of damage to the ciliated epithelium that might impair the mucociliary clearance [12][13][14].…”

“…Volumetric changes after the elevation of the sinus floor using different types of filler materials were evaluated using cone-beam computerized tomographies (CBCTs) [ 7 , 9 – 11 , 15 , 16 ]. In those studies, the changes in the thickness of the sinus mucosa were also analyzed.…”