Retention Of Locator Attachments Research Articles

Effect of Different Degrees of lingual Implant Inclination on the Retention of Locator Retained Mandibular Implant Overdenture. An In-Vitro Study

Purpose: This study was condacted to evaluate and compare different degrees of lingual implant inclination on retention of locator attachments used for two implant retained mandibular overdentures .Materials and Methods: Four acrylic resin models representing acompletely edentulous mandibular ridges were used. Each model received two implants inserted at canine area bilaterally with different degree of lingual inclination. Group I (control Group) 00, Group II (100), Group III (200), and Group IV (300). The residual ridge and the retromlar regions for each acrylic resin model were covered by auto-polymerized silicon material to simulate the oral mucosa. Four experimental acrylic metal reinforced overdenture were fabricated and connected to the implants using Locator attachments, Universal Testing Machine was used for measuring initial and final retentive force, The Results: Locator transparent, 00 inclination and anterior dislodging recorded the highest retentive forces, while Locator blue 100 inclination and vertical dislodging recorded the lowest retention values. Conclusions: For majority of groups, inserts, dislodging forces, initial retention recorded significant higher values than final retention.

Effect of Denture Cleansing Solutions on the Retention of Locator Attachments Over Time

To evaluate and compare the alterations in retention of three Locator attachments after immersion in various denture cleansers at defined time intervals. Two implants were embedded in an acrylic block. Pink, blue, and clear Locator attachments (n = 10 for each subgroup) were immersed into three different cleansing solutions (Corega, Protefix and NaOCl) and tap water (control) at different time intervals that simulate 1 (T1 ), 6 (T2 ) and 12 (T3 ) months of clinical use. Universal testing machine set at a crosshead speed of 50 mm/min was used for pull-out tests. After the immersion procedure, the peak force to dislodgement was recorded to demonstrate the changes in retention of Locator attachments. Data were analyzed using repeated-measures ANOVA followed by Tukey's Honestly Significant Difference (HSD) tests (α = .05). All denture cleansing solutions affected the retentive values of all Locator attachments at defined time intervals (F = 4.299, p = 0.001). NaOCl affected all groups significantly after 12-month immersion time (p = 0.001). The least retention loss at all subgroups was observed in Corega for clear Locator attachments (106.17 ±5.21 N). The difference in retention values for pink attachments were not statistically significant for tap water, Protefix and Corega immersion at all time intervals (p > 0.05). Following NaOCl (blue; 33.31 ±4.72 N, clear; 52.3 ±8.5 N), tap water decreased the retention value of blue (41.14 ±3.93 N) and clear (76.72 ±8.42 N) Locator attachments at T3 . Corega caused the least retention loss to clear attachments at T1 (106.17 ±3.55 N). The retention of Locator attachments decreases over time after exposure to various denture cleansing solutions. As NaOCl significantly decreased the retentive values of all attachments, patients must be informed about that disadvantage. Also, tap water remarkably decreased retentive ability of all attachments. Periodic addition of an effervescent tablet into tap water may be recommended to patients that wear implant retained overdentures with Locator attachments. This article is protected by copyright. All rights reserved.

Effect of denture cleansers with and without fatigue stress on retention of locator attachments: in-vitro study

Background To evaluate the effect of denture cleansers with and without fatigue stress on the retention of the locator attachments. Materials and methods Three dummy implants of length (13 mm) and a diameter of 4.2 mm with their locator abutments were embedded into three acrylic resin blocks. Seventy pink locator attachments were divided into three groups: 10 for group I, 30 for each group II and group III. Group I exposed to 600 cycles of insertion and removal equivalent to 6 months use, group II and group III was subdivided into three subgroups, A, B, C according to the type of cleaner which was soaked in water, chlorhexidine gluconate 2% and alkaline peroxide solution for a period equivalent to 6 months. Group III was soaked in water, chlorhexidine gluconate 2% and alkaline peroxide solution, then exposed to 600 cycles of insertion and removal. The pink locator was tested for load to dislodgment on universal testing machine with a load cell of 5 kN at a crosshead speed of two in/min. Retention of locator attachments were statistically analyzed using Mann–Whitney test. Difference of mean values between more than two groups was tested by Friedman χ2-test. Results Group I: The retention of pink locator attachments was significantly decreased after 600 cycles of insertion and removal P = 0.005. Group II: The retentive value for attachment soaked in chlorhexidine gluconate 2% and that soaked in alkaline peroxide solution was significantly lower than that soaked in water (P = 0.001). Group III: the locator soaked in water and chlorhexidine gluconate 2% and alkaline peroxide solution was significantly affected after 600 cycles of insertion and removal. Conclusion Chlorhexidine gluconate 2% and alkaline peroxide solution has significant decrease the retention of pink locator attachment. Fatigue has significant effect on the retention of locator attachment either with or without the use of denture cleansers.

The Effect of Denture Cleansing Solutions on the Retention of Pink Locator Attachments: An in Vitro Study

To evaluate the changes in retention of pink Locator attachments after exposure to various denture cleansers. Six groups (20 pairs each) of pink Locator attachments (3.0 lb. Light Retention replacement patrix attachments) were soaked for the equivalent of 6 months of clinical use in the following solutions: Water (control), Polident Regular, Efferdent, 6.15% sodium hypochlorite (NaOCL, 1:10 dilution), Polident Overnight, and Cool Mint Listerine mouthwash. A universal testing machine set at a crosshead speed of 2 in/min was used to perform one pull. The peak load-to-dislodgement was recorded to reflect changes in the retention of the Locator attachments after soaking. Data were analyzed by one-way ANOVA followed by Tukey's Honestly Significant Difference test. A p< or = 0.05 was considered significant. Denture cleansing solutions significantly affected the retentive values of pink Locator attachments (F = 344.3, p< or = 0.0001). Cool Mint Listerine mouthwash increased the retentive values of the attachments (51.10 +/- 5.31 N) when compared to the control group (45.25 +/- 3.49 N). There was no significant difference in the retentive values of attachments soaked in Polident Regular or Polident Overnight when compared to the control group. Efferdent caused a small reduction in the retentive values (40.81 +/- 2.56 N) and most importantly, diluted NaOCl caused a large reduction in the retentive values (7.83 +/- 2.50 N) of pink Locator attachments. In addition, Cool Mint Listerine mouthwash caused blue discoloration of the Locator attachments, and NaOCl caused whitening and softening of the pink Locator attachments. Cool Mint Listerine and Efferdent's small effect on the retentive values of the Locators might be clinically unimportant; however, NaOCl caused a large reduction in the retentive values of the attachments. Because of their effect on retentive values and on the color of the Locator attachments, NaOCl and Cool Mint Listerine are not recommended. These results should be interpreted clinically with caution, realizing that different results may be obtained when fatigue stress during function and multiple pulls (in vivo) are combined with the chemical action of denture cleansers.