Mandibular Implant‐Retained Overdentures: Potential Accelerator of Bone Loss in the Anterior Maxilla?

• Published in: Journal of prosthodontics 2019-02, Vol.28 (2), p.131-137
• Main Authors: Alsrouji, Mohamed Samih, Ahmad, Rohana, Rajali, Aiemeeza, Mustafa, Nor Wati Nur Atikah, Ibrahim, Norliza, Baba, Nadim Z.
• Format: Article
• Language: English
• Subjects: Bite force; Bone loss; bone resorption; Computed tomography; Computer programs; cone beam computed tomography; Dental implants; Dentures; Mandible; Maxilla; Patients; Sectioning
• ISSN: 1059-941X; 1532-849X
• DOI: 10.1111/jopr.12999

Purpose To compare the residual ridge resorption (RRR) of the anterior maxillary bone beneath complete dentures when opposed by mandibular complete dentures (CD) and implant‐retained overdentures (IRO). Materials and Methods 18 patients were rehabilitated with maxillary CD opposing mandibular IRO, and 4 patients were prescribed with conventional CD. Cone beam computed tomography (CBCT) scans of the maxilla were acquired before and 1 year post‐treatment and converted into 3D models using Mimics research software. RRR was quantified by measuring the changes in bone volume following superimpositioning and sectioning of these models at the anterior maxillary region. Subsequently, the sectioned 3D models of the anterior maxilla were exported to 3‐Matic software to reveal the predominant region and depth of RRR. Results The mean reduction in bone volume of the anterior maxilla in the CD group was 2.60% (SD = 1.71%, range = −4.89 % to −0.92%, median = −2.30%), while the mean reduction in the IRO group was almost three times higher at 7.25% (SD = 3.16%, range = −13.25 to −1.50, median = −7.15%). The predominant areas of RRR were on the buccal and occlusal ridge of the anterior maxilla. Conclusion Within the limits of this study, it may be concluded that an IRO caused significantly higher RRR of the anterior maxilla than a CD.