Effect of Interimplant Distance and Cyclic Loading on the Retention of Overdenture Attachments

Shayegh, Sayed Shojaedin; Hakimaneh, Seyed Mohammad Reza; Baghani, Mohammad Taghi; Shidfar, Shireen; Kashi, Farinaz K; Zamanian, Amirhosein; Arezoobakhsh, Ali

doi:10.5005/jp-journals-10024-2179

Cited by 8 publications

(8 citation statements)

References 24 publications

(28 reference statements)

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“…In 2012, Shayegh et al conducted a study to compare the effects of various interimplant distances and cyclic dislodgment on the retention of Locator attachments. 26 The results showed that as in our study, cyclic dislodgment resulted in decreased retention of the attachment.…”

supporting

confidence: 74%

Effects of Excessive Implant Angulation on Retention of Two Types of Overdenture Attachments during Cyclic Loading

Teimoori

Shayegh

Zavaree

et al. 2018

The Journal of Contemporary Dental Practice

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Aim: This study investigated the effects of implant angulation and cyclic dislodgment on retention of Locator and Dalbo Plus attachments.Materials and methods: Fifty pairs of acrylic blocks for five implant angulations (0, 10, 20, 30 and 40 degrees) and two attachment systems (locator and Dalbo Plus®; n = 5) were fabricated. In each pair, one block contained two implant analogs connected to their attachments, and the other block contained matrix parts of the attachments. 1440 cycles of insertion and removal were implicated on specimens after mounting the blocks in the universal testing machine. The retention was registered at cycle numbers 1, 120, 360, 720, and 1440. Data were analyzed using one-way analysis of variance (ANOVA) and Duncan's multiple range test (p ≤ 0.05).Results: Data analysis showed that implant angulation had significant effects on retention of both attachments at all different angles (p ≤ 0.05). Dalbo Plus showed no significant differences between 30 and 40 degrees (p ≥ 0.05), but between 0 and 30 degrees, differences were significant (p ≤ 0.05). Moreover, cyclic loading had significant effects on retention of both attachments at all different loading cycles (p ≤ 0.05). On evaluating combined effects of cyclic loading and implant angulation on retention, a significant decrease in retention was noted for both Locator and Dalbo Plus attachments at angulations of 0, 10, 20 degrees after 1440 cycles (1 year of clinical use; p ≤ 0.05). Conclusion:Both angulation and cyclic loading have negative effects on implant-supported overdentures and decrease retention over time. Furthermore, as the angle between implants increases, decrement of retention becomes more significant.

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supporting

confidence: 74%

Effects of Excessive Implant Angulation on Retention of Two Types of Overdenture Attachments during Cyclic Loading

Teimoori

Shayegh

Zavaree

et al. 2018

The Journal of Contemporary Dental Practice

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“…The study of Tabatabaian et al [ 23 ] showed a significantly greater resistance to dislodging forces for ball-retained overdenture at 35 mm inter-implant distance than at 15 and 25 mm inter-implant distances. Moreover, Shayegh et al [ 24 ] found that increasing the inter-implant distance between two un-splinted attachments from 19 to 23 mm and from 23 to 29 mm has significantly increased the initial retention.…”

Section: Discussionmentioning

confidence: 99%

Effect of Implant Location on Palateless Complete Overdenture Retention: an In Vitro Study

El-Amier¹,

Elsaih²,

Gibreel³

et al. 2018

JOMR

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ObjectivesThe purpose of this in vitro study was to evaluate effect of implant location on initial retention values of palateless complete overdentures retained by four o-rings at different inter-implant distances.Material and MethodsTwo standard acrylic models representing completely edentulous maxillary arches were used. Four single piece ball type implants were placed in each model. Models were divided into two groups according to the distance between anterior and posterior implants. Two canine implants with 32 mm inter-implant distance were placed in both models. In one model (G1), two posterior implants were placed in second premolar region away from canine implants by 14 mm on both sides, while in the other model (G2), the two posterior implants were placed in first molar region away from canine implants by 22 mm on both sides. Eighteen palateless complete overdentures were constructed for each model. Overdentures were retained by four o-rings. Initial axial (central), and para-axial (anterior, posterior, and lateral) retention values of overdentures were estimated and compared using a universal testing machine.ResultsIndependent t-test revealed that implant location has a significant role in palateless complete overdenture retention with a level of significance set at P < 0.05.ConclusionsFor in vitro simulated palateless implant overdentures retained by four o-rings, increasing the inter-implant distance between anterior and posterior implants is favourable for a more retentive prosthesis.

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“…The value was measured at the first cycle and then following completion of each 90-cycle simulating one month until completing 1080 placement/removal cycles simulating one year of use, three cycles per day assuming that an overdenture is expected to be removed three times a day for cleaning. The dislodgment rate was kept at one cycle per 3 seconds to allow nylon attachment elastic recovery [ 31 ].…”

Section: Methodsmentioning

confidence: 99%

The Effect of Mini Dental Implant Number on Mandibular Overdenture Retention and Attachment Wear

Alshenaiber

Barclay

Silikas

2023

BioMed Research International

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Purpose. Evaluate the effect of different mini-implant numbers on overdenture retention and evaluate attachment wear following one year of simulated placement/removal. Material and Methods. Nine models simulating atrophic mandibles held 27 mini dental implants in three groups of 2, 3, and 4 mini-implants. A total of 1080 simulated placement/removal cycles were carried out, and a digital force gauge was used to measure the overdenture dislodgment force. The means of the retention forces were analyzed using SPSS with one-way ANOVA and post hoc ( p < 0.05 ). The inner diameter of attachment inserts was evaluated using a light microscope before and after testing. A paired t -test was used to compare the mean of inner ring diameters ( p < 0.05 ). Results. The retention was significantly reduced regardless of the mini dental implant number, but the number affected overdenture retention. The placement of 4 mini dental implants provided higher retention and less reduction in retentiveness. However, no significant difference was found when 3 mini dental implants were compared to 2 mini dental implants ( p = 0.21 ). Microscopic examination showed abrasion wear in all inserts following testing. However, the inserts of the 4 mini dental implants showed less wear than those used for 2 or 3 mini dental implants with p ≤ 0.001 and p ≤ 0.001 , respectively. Conclusion. Mini dental implant overdenture retention force and attachment wear could improve by increasing the mini dental implants to 4. However, there was no difference in retention force or attachment wear when 2 or 3 mini dental implant overdentures were compared.

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Effect of Interimplant Distance and Cyclic Loading on the Retention of Overdenture Attachments

Cited by 8 publications

References 24 publications

Effects of Excessive Implant Angulation on Retention of Two Types of Overdenture Attachments during Cyclic Loading

Effects of Excessive Implant Angulation on Retention of Two Types of Overdenture Attachments during Cyclic Loading

Effect of Implant Location on Palateless Complete Overdenture Retention: an In Vitro Study

The Effect of Mini Dental Implant Number on Mandibular Overdenture Retention and Attachment Wear

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