Document Type

Article

Publication Date

2011

Abstract

objective: This research was carried to evaluate which ball size mounted on bar splinting two implants supporting overdenture is more favorable regarding bone height and density. material &methods: Two implants(Tut Dental Implant System,ECDI Cairo, Egypt) splinted by bar (OT bar Multiuse attachments,Cas,RHEIN 83, ITALY) carrying two balls (OT Cap attachments, Cas, RHEIN 83 Italy) were inserted in n=10/gp. Patients were divided into two groups according to the size of the balls used which were either micro1.8mm or macro 2.5mm (control group). For all patients overdentures were constructed & conventional tomograms were taken. Crestal bone height & density around the implants in zone-1(osseointegration-zone) and zone-2 at insertion, six and twelve months were measured and statistically analyzed (Studentt-test, p≤0.05). results: Crestal bone heights: The two groups showed bone resorption however, statistically significant difference between the two groups was found, where micro-size ball showed less bone resorption with mean difference0.57±0.08 from insertion to twelve months in comparison to macro-size ball which showed 1.03±0.20 mean difference from insertion to twelve months. Bone density: The two groups showed increase in bone density. In zone-1: Statistically significant difference was found between the two groups, where micro-size ball showed less increase in bone density with mean difference 26.19±4.02from insertion to twelve months in comparison to macro-size ball which showed 44.12±7.34 mean difference from insertion to twelve months. In zone-2: Statistically non-significant difference was found between the two groups , where micro-size ball showed mean difference 59.02±2.59 from insertion to twelve months in comparison to macro-size ball which showed 59.96±6.26 mean difference from insertion to twelve months. conclusion: Micro-size balls show less bone resorption however, macro-size balls show more increase in bone density.

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