| 0242 Retentive Properties of Overdenture Stud and Magnetic Attachments | ||
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V. RUTKUNAS1, H. MIZUTANI2, and H. TAKAHASHI2, 1 Vilnius University, Lithuania, 2 Tokyo Medical & Dental University, Japan Objectives: To evaluate retentive properties of stud (Era Overdenture (orange and white), Locator Root (pink) and OP anchor # 4) and magnetic attachments (Hyperslim 4513, Hyperslim 4013, Magfit EX600, Magnedisc 500 and Magfit-RK) by measuring maximum retentive force, range of retention, retentive energy and fatigue behavior. To identify importance of retentive properties in selection of retentive device. Methods: Retentive properties were evaluated using 12 specimens of each type of attachment. 4 types of dislodgements were performed on one-tooth and mandible-overdenture models. For each type of dislodgement10 measurements (range of retention (µm), maximum retentive force (N), retentive energy (Nmm)) were recorded by universal testing machine (AGS-H, Shimadzu Co., Kyoto, Japan) with 50 mm/min cross head speed. After fatigue simulation retentive properties were re-examined. Statistical analysis: one-way ANOVA and Scheffe post-hoc tests. Results: Magnetic attachments had significantly lower range of retention. Linear dislodgement test revealed that most retentive were Era (orange) attachments, followed by Locator Root (pink), Era (white), Magfit-RK, Hyperslim 4513, Hyperslim 4013, Magfit EX600W, Magnedisc 800 and O-P anchor. As for rotational dislodgements maximum retentive force of magnetic attachments decreased in following order – anterior > lateral > posterior; while that of studs – posterior > anterior > lateral. Magnetic attachments had considerably lower retentive energy values for all types of dislodgements. Conclusions: Retentive properties depend on type of attachment and dislodgment. During lateral and distal rotational dislodgments retentive properties of magnetic attachments decreased significantly. Range of retention, as well as resistance to rotational movements provided by attachment is considerable factor improving overdenture stability, hence patient satisfaction. Attachments with proper retentive properties should be selected in particular clinical situation. | ||
| Seq #25 - Prosthodontics Research 11:30 AM-1:00 PM, Friday, 27 August 2004 Crowne Plaza Hotel SEDEF II | ||
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