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Case Reports
. 2022 Apr 2;10(4):58.
doi: 10.3390/dj10040058.

Radiographic and Histomorphologic Evaluation of the Maxillary Bone after Crestal Mini Sinus Lift Using Absorbable Collagen-Retrospective Evaluation

Saverio Cosola  1 , Biagio Di Dino  1 , Tonino Traini  2 , Young-Sam Kim  3 , Young-Min Park  3 , Simone Marconcini  1 , Ugo Covani  1 , Raffaele Vinci  4   5
Affiliations
Case Reports

Radiographic and Histomorphologic Evaluation of the Maxillary Bone after Crestal Mini Sinus Lift Using Absorbable Collagen-Retrospective Evaluation

Saverio Cosola et al. Dent J (Basel). .

Abstract

Background: After tooth extraction, the alveolar bone loses volume in height and width over time, meaning that reconstructive procedures may be necessary to perform implant placement. In the maxilla, to increase the bone volume, a mini-invasive surgery, such as a sinus lift using the crestal approach, could be performed.

Methods: A crestal approach was used in this study to perform the sinus lift, fracturing the bone and inserting collagen (Condress®). The single dental implant was placed in the healed bone after six months.

Results: The newly formed bone was histologically analyzed after healing. Histomorphological analyses confirmed the quality of the new bone formation even without graft biomaterials. This is probably due to the enlargement of the space, meaning more vascularization and stabilization of the coagulum.

Conclusion: Using just collagen could be sufficient to induce proper new bone formation in particular clinical situations, with a minimally invasive surgery to perform a sinus lift.

Keywords: CBCT; bone histology; collagen; hyaluronic acid; mini sinus lift; radiographic evaluation.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
The section of the CBCT showing a residual height of 3.6 mm before the sinus lift at baseline.
Figure 2
Figure 2
The section of the CBCT showing a residual height of 11.2 mm after 6 months from the sinus lift, meaning an earning bone height of 7.6 mm. The bone seems to be of good quality for dental implant placement.
Figure 3
Figure 3
Low-power magnification (9×) of the bone core in the longitudinal section appeared to be well organized with a trabecular network (B) and several distributed marrow spaces (MS). No biomaterial remnants were reported. azure B–methylene blue staining was used.
Figure 4
Figure 4
Low-power magnification (12×) of the longitudinal central section of the bone core. A fine trabecular bone network (B) and distributed marrow spaces (MS) were seen. Small remnants of biomaterial were present. (CB) crestal bone; (SB) sinus bone; azure B–methylene blue staining was used.
Figure 5
Figure 5
At low-power magnification (20×), the transversal and top and bottom sections were related to the longitudinal central section of the bone specimen to best analyze the bone microstructure of the regenerated area. The source sites of the transversal sections were visible and labelled, along with the longitudinal ones. The bone microstructure appeared to be well organized, with thicker bone trabeculae (B) that were mainly present in the bottom areas, while under the bone sinus floor, very thin and distributed bone trabeculae were highlighted. The marrow spaces (MS) were well distributed along all the sections. Several small remnants of biomaterial (*) were present mainly under the sinus floor bone. Azure B–methylene blue staining was used. (CB) crestal bone; (SB) sinus bone.
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