The Effect of Reciprocal Arm on the Supporting Structures of the Abutments in Cases Retained by Unilateral Attachment

AlmEldeen, Hesham I.

doi:10.21608/edj.2017.75249

Cited by 4 publications

(4 citation statements)

References 11 publications

(14 reference statements)

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“…The bracing arm and plate incorporated in the design act to counteract the harmful lateral forces at the attachment, thereby decrease the wear of the attachment (30)(31)(32) .…”

Section: Discussionmentioning

confidence: 99%

Effect of Cross Arch Stabilization on the Retention of a Unilateral Distal Extension Partial Denture Using a Resilient Extracoronal Attachment: (In Vitro Study)

Aboutar

Elkerdawy

Fayyad

2023

Egyptian Dental Journal

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Aim:The aim of this in-vitro study was to compare the retention of unilateral attachment retained removable partial denture with crossing the arch for stabilization versus not crossing the arch. Retention was measured using the Universal Testing machine.Methods: Mandibular epoxy model was made simulating unilateral free end saddle case with missing right first molar and second molar. The right first and second premolars were prepared to receive surveyed crowns with attached patrices of "rk-1 uni" attachment. Two metal-framework designs were made with matrices of "rk-1 uni" attachment casted to it. The intervention group design was a unilateral partial denture without cross-arch stabilization. The control group design was a conventional partial denture with cross-arch stabilization using double Aker clasp on the dentate side. A ready-made hook was attached to the geometric center of the intervention group partial denture. In the control group, a metal bar with a ready-made hook was attached to the geometric center of the partial denture. The hooks were used to help in measuring the retention with the Universal Testing Machine, at a speed of 0.5 mm/min. Measurements were done initially, after 500, 1000, 1500 & 2000 insertion/removal cycles which simulate 2 years of use by the patient.Results: Statistically significant difference was found between retention of both designs (p<0.001). The partial denture of the control group showed higher retention than the intervention group partial denture. Both groups lost retention over time. Retention increased again after 1500 cycles. After completion of 2000 cycles, the control group partial denture design showed higher retention than the intervention group partial denture design. Conclusion:The unilateral partial denture design had less retention than the partial denture with cross-arch stabilization. It also lost more retention than the denture with cross-arch stabilization. Although both dentures had initial acceptable retention force above 5 N, yet the denture with crossarch stabilization showed superior retention than the unilateral denture after 2000 cycles.

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“…The bracing arm and plate incorporated in the design act to counteract the harmful lateral forces at the attachment, thereby decrease the wear of the attachment (30)(31)(32) .…”

Section: Discussionmentioning

confidence: 99%

Effect of Cross Arch Stabilization on the Retention of a Unilateral Distal Extension Partial Denture Using a Resilient Extracoronal Attachment: (In Vitro Study)

Aboutar

Elkerdawy

Fayyad

2023

Egyptian Dental Journal

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“…Group II showed higher percentage of bone height changes than group I after 12 months, this noticeable changes may be due to the special design of the OT Unilateral attachment as, its elasticity, the presence of two heads in two different levels (horizontal and vertical planes) that help in even distribution of applied stresses more favorably under masticatory forces and improve stability of prosthesis, retention, comfort, and facilitate the ability to bite without fear from the loss of retention (15) . The result of this study came in agreement of other researches as, OT Unilateral attachment show minimal effect on supporting structures of the abutments this may be due to there was no importance in ex tending of the prosthesis across the arch that add the advantage of no need to prepare more abutment teeth , minimizing the bulk of material in the mouth and, therefore, decreasing the areas of soft and hard tissue coverage unlike OT cap attachment that need cross arch stabilization so state of supporting structure has good condition in case of OT unilateral attachment (16,17) .…”

Section: Discussionmentioning

confidence: 99%

Effect of two Designs of Extracoronal Attachments on Supporting Structures in Kennedy Class II Mandibular Partial Denture

Mohamed¹,

Kabeel

Kholief

2022

ADJ-for Girls

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Purpose:The aim of this study was to compare between the effects of using two different designs of extra coronal precision attachments on supporting structures of the abutment teeth in unilateral free end saddle partial denture. Material and Methods: Ten Kennedy class II partially edentulous patients with the last second premolar which is lasting abutment tooth were selected. The patients were divided into two groups (each group five patients), group I; patients were received unilateral partial denture retained by OT unilateral extra coronal attachment, group II; patients were received partial denture retained by OT cap extra coronal attachment with bilateral cross arch stabilization. Clinical evaluation including pocket depth measurements at four sides of last abutment tooth and radiographic evaluation using cone beam computed tomography (CBCT) was done at time of partial denture delivery, after 6, 9 and 12 months. Results: Inspection of radiographic evaluation revealed non-statistical significant difference between the two groups at the time of insertion, 6 and 9 months while after 12 months group II showed more bone loss than group I. Regarding the clinical evaluation showed non-statistical significant difference in pocket depth between two groups at time of insertion, 6 and 9 months and more pocket depth in group II at 12 months. Conclusions: Using special design of extra coronal castable precision attachment (OT unilateral) exerts less stresses on the abutments and their supporting structures in comparison with OT cap attachment, in addition to it is simple and more comfortable to the patients.

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“…The attachment has both mechanical and esthetic advantages as it features elastic retention, which controls the flexure and constructs a resilient and shock absorbing prosthesis as well as reducing the amount of metal display, which will improve aesthetics. (9,10,11) The extracoronal double OT Unilateral attachment kit features a distinctive two-in-one design that incorporates horizontal and vertical microspheres with the OT cap and OT strategy attachment systems giving lateral stability and distal support to the prothesis. (5) The double OT attachment system can restore distal extension areas without the need of cross arch extension to the other side of the arch as the support from the RPD and its connection to fixed prosthesis generates cross arch stability during masticatory activity and allows fixed prosthesis-like function.…”

Section: Discussionmentioning

confidence: 99%

Evaluation of Double OT CAP Attachment in Unilateral Partial Denture Cases with Different Saddle Length An In-Vivo Study

Gamal

Mohammed

Eid

2021

Ain Shams Dental Journal

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Aim:The aim of this study was to radiographically evaluate the effect of using double OT Cap attachment on the supporting structures of unilateral partial denture cases with different saddle length using the Digora imaging system. Methodology: 16 patients with unilateral distal extension partially edentulous lower arches with last standing abutment 4 or 5 were selected in this study. Patients were rehabilitated with a unilateral RPD retained with a double OT Cap attachment where the last abutment is the 2nd premolar in group I & 1st premolar in group II. The lower 4 & 5 on the distal extension side in group I were prepared to receive a ceramo-metallic 2-unit fixed crowns, the same was done for 3&4 in group II. Crowns with their attachments were cemented to the abutment teeth and denture was delivered to the patient. Marginal bone height changes around abutments & residual ridge posteriorly were measured by Digora system. Data were collected at different follow-up intervals tabulated and statistically analyzed by Tukey`s post hoc test and t-test for comparison between groups.Results: Results of this study showed a significant difference as P < 0.05 in all intervals regarding overall 1st & 2nd abutment & distal extension ridge, bone changes in group II was significantly higher than group I. Conclusion: With in the limitation of this study, it could be concluded that attachment retained partial dentures with OT unilateral attachment provide less bone height changes around the abutment & in the posterior area in short saddle cases.

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The Effect of Reciprocal Arm on the Supporting Structures of the Abutments in Cases Retained by Unilateral Attachment

Cited by 4 publications

References 11 publications

Effect of Cross Arch Stabilization on the Retention of a Unilateral Distal Extension Partial Denture Using a Resilient Extracoronal Attachment: (In Vitro Study)

Effect of Cross Arch Stabilization on the Retention of a Unilateral Distal Extension Partial Denture Using a Resilient Extracoronal Attachment: (In Vitro Study)

Effect of two Designs of Extracoronal Attachments on Supporting Structures in Kennedy Class II Mandibular Partial Denture

Evaluation of Double OT CAP Attachment in Unilateral Partial Denture Cases with Different Saddle Length An In-Vivo Study

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