EVALUATION OF PERIIMPLANT STRAIN WITH DIFFERENT SAGITTAL IMPLANT INCLINATION AND DENTURE ATTACHMENTS IN MANDIBULAR IMPLANT-RETAINED OVERDENTURE

Abstract

This experimental study aimed to evaluate the periimplant strain with different sagittal implant inclination and denture attachment on mandibular periimplant strain under posterior loading. The results of the study revealed that: 1) at 0-degree angulation, the highest strain was observed at the lingual and distal sites, whereas at 15- and 30-degree angulations, the highest strain shifted to the labial site; 2) labial strain at 15- and 30-degrees were significantly higher than those at 0-degrees, while the lingual and distal sites exhibited the highest strain at 0-degree angulation; and 3) at 15-degree angulation, the Locator group showed the highest strain at the labial site, whereas at 30-degree angulation, the Locator R-Tx group demonstrated the highest strain at the labial site. These findings indicate that increasing implant inclination affects the pattern of periimplant strain distribution and is influenced by attachment design. Parallel implant placement remains the most favorable approach to minimize periimplant stress. However, when implant inclination is unavoidable, appropriate selection of attachment systems may help reduce stress transmission to the periimplant bone, the Locator R-Tx group should be considered for implants with a 15-degree angulation, as this configuration is associated with lower peri-implant strain compared to the Locator group. For implants inclined at 30-degree, caution is advised when using either attachment system, and alternative implant positioning that results in a reduced angulation of less than 30-degree should be considered.

Keywords: Implant Overdenture, Implant Inclination, Periimplant Bone Strain, Denture Attachment