Special Design to Facilitate Retrieval of Cement-Retained Zirconia-Based Implant-Supported Restorations

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FARZIN MITRA; DERAFSHI REZA; GITI RASHIN; Taghva Masumeh

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Journal Paper

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Journal: Journal of Dentistry Year:2021 | Volume:22 | Issue:2 Page(s): 132-137

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Information Journal Paper

Title

Special Design to Facilitate Retrieval of Cement-Retained Zirconia-Based Implant-Supported Restorations

Author(s)

FARZIN MITRA | DERAFSHI REZA | GITI RASHIN | Taghva Masumeh | Issue Writer Certificate

Keywords

Zirconia

Implant-Supported

Retrieval

Abstract

Statement of the Problem: Retrieval of cement-retained Implant-Supported restorations is challenging in cases of screw loosening or periodontal problems. Purpose: The purpose of this study was to evaluate the effect of the screw access hole on the fracture resistance of Zirconia-based cement-retained restorations with and without an access opening. Materials and Method: In this in vitro study thirty-three cement-retained Implant-Supported Zirconia-based molar crowns were fabricated and divided into 3 groups (n=11). As the control group, group 1 consisted of conventional cement-retained crowns. Group 2 comprised conventional cement-retained crowns in which a hole was created in the location of the screw. Group 3 consisted of cement-retained crowns in which a ledge was created in the location of the screw access channel. The specimens were cemented to their abutments and their access openings were filled with composite resin. A compressive load was applied to the specimens using a universal testing machine until they fractured. The mean fracture resistance values of the samples were compared by using the one-way ANOVA and Tam-hane post-hoc test (a=0. 05). Results: The mean fracture resistance values were 1270. 18± 12. 67 N in group 1 (the control group), 960. 09± 210. 67 N in group 2 (conventional), and 1357. 81± 361. 68 N in group 3 (the special design). The fracture resistance value was higher in the special design group than that of the conventional design (p= 0. 018) and the fracture resistance value of the conventional design group was less than that of the control group (p= 0. 042). No statistically significant difference was detected between the control group and the special design group in fracture resistance values. Conclusion: Preparing a screw access hole in cement-retained Implant-Supported Zirconia-based crowns decreased the fracture resistance of the restoration. Designing a ledge in the Zirconia framework around the access hole may increase the fracture resistance of the resto-ration.

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References

The Effect of Sintering Time on the Marginal Fit of Zirconia Copings

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APA: Copy

FARZIN, MITRA, DERAFSHI, REZA, GITI, RASHIN, & Taghva, Masumeh. (2021). Special Design to Facilitate Retrieval of Cement-Retained Zirconia-Based Implant-Supported Restorations. JOURNAL OF DENTISTRY (SHIRAZ UNIVERSITY OF MEDICAL SCIENCES), 22(2), 132-137. SID. https://sid.ir/paper/975217/en

Vancouver: Copy

FARZIN MITRA, DERAFSHI REZA, GITI RASHIN, Taghva Masumeh. Special Design to Facilitate Retrieval of Cement-Retained Zirconia-Based Implant-Supported Restorations. JOURNAL OF DENTISTRY (SHIRAZ UNIVERSITY OF MEDICAL SCIENCES)[Internet]. 2021;22(2):132-137. Available from: https://sid.ir/paper/975217/en

IEEE: Copy

MITRA FARZIN, REZA DERAFSHI, RASHIN GITI, and Masumeh Taghva, “Special Design to Facilitate Retrieval of Cement-Retained Zirconia-Based Implant-Supported Restorations,” JOURNAL OF DENTISTRY (SHIRAZ UNIVERSITY OF MEDICAL SCIENCES), vol. 22, no. 2, pp. 132–137, 2021, [Online]. Available: https://sid.ir/paper/975217/en

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