Five-year Radiographic Changes of Residual Ridges under Maxillary Complete Denture and its Opposing Mandibular Two Implant-Retained Overdenture with Different Resilient Attachments

Abstract

Aim: This study aimed to radiographically compare the effect of different resilient attachments on maxillary and mandibular residual ridge changes after 5 years of using mandibular 2-implant retained overdentures. Materials and methods: Eighteen completely edentulous male patients, with age ranging from 45 to 60 years, were included in the study. Maxillary complete dentures were constructed opposed to 2-implant retained mandibular overdentures. Patients were divided randomly into three equal groups according to type of attachment into; ball/socket (BOD) group, Locator attachment (LOD) group, and positioner attachment (POD) group. Maxillary and mandibular ridge resorption were determined by using the proportional area index method on the panoramic radiograph taken at time of overdenture insertion and at five years later. Results: The minimal rate of ridge resorption was recorded for posterior maxillary ridges (Max-PRRR) followed by that of posterior mandibular ones (Mand-PRRR), while the highest resorption rate was recorded for anterior maxillary ridges (Max-ARRR). The study did not reveal significant difference in ridge resorpion between the resilient attachment systems. Conclusion: Mandibular overdentures retained by two implants with the described attachment systems provide a similar and acceptable range of residual ridge resorption (RRR) after 5years of function. The reduced RRR with Locator attachments proved its ability to provide an equitable load on the implants and tissue bearing areas during function.

PASSIVITY OF SCREW-RETAINED IMPLANT-SUPPORTED PEEK FRAMEWORKS USING SEGMENTED VERIFICATION JIGS VERSUS CONVENTIONAL JIGS-FREE TECHNIQUES UTILIZING OPEN-TRAY IMPRESSION PROCEDURES: 2 years clinical & radiographic outcomes

“…These criteria might be biological or mechanical or both. [15] To prevent any variations in bone changes that would affect the results, patients' ages ranged from 45 to 65.…”

Mandibular bone height changes in two different design concepts of four implant assisted overdenture

“…Moreover, Emara (2019) [21] stated that implant Mandibular overdentures retained by resilient attachment systems provide a low acceptable range of residual ridge resorption after 5years of function It has been suggested that functional loading and light irritative stimuli could lead to changes in bone architecture, shape, and volume, and that by placing implants in the edentulous mandible and subsequently loading them, functional conditions could be created to limit bone resorption in the distal area of the mandibular alveolar ridge. [22] The Mechanostat theory, first proposed by Frost in 1987 describes a regulatory mechanism within bone that deals with strain magnitude and invokes bone formation and resorption as the primary "effector mechanisms" by which bone alters its structure and properties in response to mechanical usage.…”