The Effect of Anterior-Posterior Spread and Cantilever Length on the Supporting Structures of Maxillary Screw Retained Prosthesis

Khorshid, Heba E.; Sheta, Nora

doi:10.21608/edj.2017.75174

Cited by 3 publications

(3 citation statements)

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“…In patients receiving screw retained prosthesis with a ratio of 1:2 cantilever length using standard implant diameter(3.7mm), bone height changes were recorded to be 1.33±0.24mm. A clinical important difference based on expert opinion = 0.4., this is the least acceptable difference between the two groups 15 . Independent-t-test with a power of 80% and 0.05 alpha significance was used for sample size calculation, and 7 patients were reported in each group, with a total of 14 patients.…”

Section: Sample Size Calculationmentioning

confidence: 87%

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A Correlation Study between different Implant Diameters and Cantilever Lengths on the Marginal Bone Loss of Implant Supported Maxillary Prostheses: A Randomized Controlled Trial

Abdelnabi

KHORSHID²

2023

Advanced Dental Journal

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Objectives: To report a correlation between the different implant diameter and different cantilever length regarding bone height changes in implant supported maxillary prosthesis.Materials and methods: Sixteen patients were recruited to receive six implants in the edentulous maxilla. Patients were randomized using sealed envelopes into two groups: Group I received small diameter and Group II with standard diameter. Patients were similarly randomized into sub-groups; Groups IA, IB, IIA and IIB. In Groups IA, IIA, implants were placed with an anterior-posterior AP implant spread to the cantilevers lengths at a ratio of 1:3 while in Group IB, IIB implants were placed at a ratio of 1:2. Cone Beam Computed Tomography (CBCT) was performed at the day of prosthesis delivery, after 4, 8 and 24 month follow up to measure the marginal bone height changes. Spearman`s correlation coefficient was used to correlate between bone height and different implant diameters and cantilever lengths. The significance level was set at P ≤ 0.05. Results: A weak positive insignificant correlation was found between the different cantilever length and the small and standard implant diameter. Conclusion: Both the standard and small implant diameter with different cantilever length showed marginal bone height changes within the physiologic limit for implant supported maxillary prosthesis.

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Section: Sample Size Calculationmentioning

confidence: 87%

“…Khorshid et al compared the bone height changes between two different diameters with different cantilever length after 24 month follow up period 15 . In patients receiving screw retained prosthesis with a ratio of 1:2 cantilever length using standard implant diameter(3.7mm), bone height changes were recorded to be 1.33±0.24mm.…”

Section: Sample Size Calculationmentioning

confidence: 99%

A Correlation Study between different Implant Diameters and Cantilever Lengths on the Marginal Bone Loss of Implant Supported Maxillary Prostheses: A Randomized Controlled Trial

Abdelnabi

KHORSHID²

2023

Advanced Dental Journal

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“…Sample size calculation was performed according to a study 19 that compared the marginal bone height changes around implants supporting full arch maxillary prostheses placed with different cantilever length after a two year follow up period. A clinical important difference based on expert opinion of 0.4 was used.…”

Section: Methodsmentioning

confidence: 99%

Effect of implant diameter and cantilever length on the marginal bone height changes and stability of implants supporting screw retained prostheses: A randomized double blinded control trial

Khorshid

Issa

Ekram³

2023

J Adv Prosthodont

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PURPOSE This randomized controlled trial aimed to evaluate the effect of implants’ two different diameters and cantilever lengths on the marginal bone loss and stability of mplants supporting maxillary prostheses. MATERIALS AND METHODS Ninety-six implants were placed in sixteen completely edentulous maxillary ridges. Patients were randomly divided into two groups: Group A, implants were placed with a cantilever to anterior-posterior AP spread length (CL:AP) at a ratio of 1:3; Group B, implants were placed with a CL:AP at a ratio of 1:2. Patients were further divided into four sub-groups: Groups A1, A2, B1, and B2. Groups A1 and B1 received small diameter implants while Groups A2 and B2 received standard diameter implants. Bone height and stability measurements around each implant were performed at 0, 4, 8 and 24 months after definitive prostheses delivery. RESULTS Statistical analysis of the mean implant stability and height values revealed an insignificant difference between Group A1 and Group A2 at all the different time intervals while significantly higher values in Group B1 in comparison with Group B2. Results also showed significantly higher values in Group A1 in comparison with Group B1 and an insignificant difference between Group A2 and Group B2 at all the different time intervals. CONCLUSION It can be concluded that the use of small diameter implants placed with a CL:AP at a ratio of 1:3 provided predictable results and that the 1:2 CL:AP significantly induced more critical bone loss in the small diameter implants group, which can significantly reduce long term success and survival of implants.

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New Rehabilitation Concept for Maxillary Edentulism: A Clinical Retrospective Study of Implant Crown Retained Removable Partial Dentures

Yoo

Kim

Heo

et al. 2021

JCM

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There have been no studies of implant-crown-retained removable partial dentures (IC-RPD) for the treatment of maxillary edentulism. The purpose of this study was to perform clinical and radiographic evaluations of implants in IC-RPD compared to implant overdentures (IOD) in maxillary edentulous patients. Twenty IC-RPDs with 74 splinted implant crowns and 18 IODs with 71 implants retained with magnet attachments were observed in 38 patients. We statistically analyzed survival rates and marginal bone loss (MBL) of implants based on multiple variables including first year pathologic condition, location of placed implant, age, and sex in both treatments. Patient reported oral measurements (PROMs) regarding functional/esthetic improvement after IC-RPD or IOD treatments and prosthetic complications were also statistically analyzed. After a median observation period of 47.1 months (up to 147 months), we observed 97.3% implant survival rates for IC-RPD and 70.4% for IOD (p < 0.001). Among variables, first year pathologic condition (p < 0.001) and sex (p = 0.027) influenced implant survival rates. The MBL of implants for IC-RPD and IOD groups at the final check-up were 1.12 ± 1.19 mm and 3.31 ± 1.71 mm, respectively (p < 0.001). In both groups, patients with peri-implantitis (p < 0.001) and patients older than 65 years (p = 0.029) showed significantly higher implant MBL regardless of treatment modality. Functional and esthetic satisfaction were significantly improved (p < 0.001) after both treatments. The IOD group showed more frequent prosthetic complications compared to the IC-RPD group. Within the limitations of a retrospective study, we concluded that RPD with few splinted implant crowns is a feasible alternative treatment modality for maxillary edentulous patients with anatomical limitations.

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The Effect of Anterior-Posterior Spread and Cantilever Length on the Supporting Structures of Maxillary Screw Retained Prosthesis

Cited by 3 publications

References 0 publications

A Correlation Study between different Implant Diameters and Cantilever Lengths on the Marginal Bone Loss of Implant Supported Maxillary Prostheses: A Randomized Controlled Trial

A Correlation Study between different Implant Diameters and Cantilever Lengths on the Marginal Bone Loss of Implant Supported Maxillary Prostheses: A Randomized Controlled Trial

Effect of implant diameter and cantilever length on the marginal bone height changes and stability of implants supporting screw retained prostheses: A randomized double blinded control trial

New Rehabilitation Concept for Maxillary Edentulism: A Clinical Retrospective Study of Implant Crown Retained Removable Partial Dentures

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