Mechanical aging and Retention Forces Assessment of Three Different Modalities of Titanium Milled bar in Implant Retained Mandibular Overdenture: An in-vitro study | ||||
| Ain Shams Dental Journal | ||||
| Volume 37, Issue 1, March 2025, Page 419-428 PDF (1.28 MB) | ||||
| Document Type: Original articles | ||||
| DOI: 10.21608/asdj.2025.355959.1823 | ||||
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| Authors | ||||
shaimaa Ahmed Radwan   1; Iman Adel El Asfahani 2; Hussein Abdelhady Hussein 3
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| 1Prosthodontic department, Faculty of dentistry,Minia university ,Egypt | ||||
| 2Professor of Prosthodontics Department, Faculty of Dentistry, Minia University | ||||
| 3Lecturer in Prosthodontics Department, Faculty of Dentistry, Minia University | ||||
| Abstract | ||||
| Aim: To evaluate the axial retention forces of three different titanium milled bar attachment systems: milled bar , milled bar with supra OT equator, milled bar with supra ball for in implant-retained mandibular overdenture. Materials and methods: An epoxy resin model was constructed simulating completely edentulous mandible. Two implants were inserted in canine regions ,and one in the left central incisor region. Bar attachments designs were constructed by CAD/ CAM technology. Experimental overdentures were to connected to either implants with milled titanium bar attachment (group I), or milled bar with supra ball attachments (group II),or milled bar with supra OT equator attachment (group III). The axial retention force was measured in Newton by universal testing machine for each attachment system at base line (T0) to (T11) which simulating five years of the overdenture function (T11 after 5400 cycles of insertion and removal). To compare the three groups to each other; one way-ANOVA followed by Tukey post hoc test, were used to compare between more than two groups in non-related samples. Results: The milled bar with supra ball attachments had a significantly highest retention forces (142 Newton) followed by milled bar with equator attachments (118.65 Newton), while the lowest one was milled bar (111.40 Newton) at base line. The loss of retention force continued throughout the study to reach (22.96 Newton) for milled bar with ball, (20.6 Newton) for milled bar with equator, and for milled bar (18.74 Newton) at the end of the study. conclusion: The retention forces for the milled bar with ball attachment systems demonstrated significantly higher retention forces than those for the milled bar with OT equator, milled bar after cyclic insertion and removal. | ||||
| Keywords | ||||
| KEYWORDS: Milled titanium bar; Retention forces; Mandibular implant overdenture | ||||
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