Parameters Affecting the Retention Force of CAD/CAM Telescopic Crowns: A Focused Review of In Vitro Studies

Kamel, Abdullah; Badr, Amr Mohamed Ismail; Fekry, Gehan; Tsoi, James Kit‐Hon

doi:10.3390/jcm10194429

Cited by 7 publications

(3 citation statements)

References 52 publications

(167 reference statements)

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“…Interestingly, the study by Kamel et al, [22] agreed the findings of the current study which evaluated the performance of telescopic crown material combination, including PEEK-PEEK, PEEK-ZrO2, and PEEK-CoCr. In contrast to the other groups, they noticed that the PEEK-PEEK crown combination experienced the highest retention force.…”

Section: Discussionsupporting

confidence: 91%

Evaluation of retention and wear resistance of different telescopic crown attachment materials in implant retained overdenture (an in vitro study)

Selima,

hamid,

Basiony

2024

Preprint

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Background: The aim of this study is to evaluate the effect of using different types of telescopic crown attachment materials on the retention and wear resistance in implant-retained mandibular overdentures. Methods: Thirty-three identical mandibular overdentures were fabricated on completely edentulous mandibular epoxy models supported by two implants in the canine region and retained to the implants with three different telescopic attachments materials. Study groups were divided into three categories: PEEK/PEEK, PEEK/ZrO2 and PEEK/CoCr. Primary PEEK copings were fabricated for all the study groups, followed by fabrication of secondary copings from PEEK, ZrO2, and CoCr. Retention and wear between the three groups was evaluated. Results: Highest retention was recorded for PEEK/PEEK combination, followed by PEEK/ZrO2 and PEEK/CoCr respectively. For wear resistance test, primary copings of all study groups were examined under stereomicroscope. Mesio-distal width was measured before the application of insertion-removal cycles and after completion of 1.000, 5.000 and 10.000 cycles. The highest level of wear resistance was recorded for PEEK/PEEK combination, while PEEK/ZrO2 and PEEK/CoCr showed no significant differences. Conclusion: The materials used for telescopic crowns influence the absolute retention forces and the resistance to wear, even if the same crown design was chosen. Within the limitations of this study, PEEK-PEEK combination showed better outcome regarding retention and wear resistance followed by PEEK-ZrO2.

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Section: Discussionsupporting

confidence: 91%

Evaluation of retention and wear resistance of different telescopic crown attachment materials in implant retained overdenture (an in vitro study)

Selima,

hamid,

Basiony

2024

Preprint

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“…However, using a Zirconia or PEKK main crown is a good choice if a metalfree procedure is intended. 51 Milling was used for fabrication the frameworks and the primary crowns as it minimizes fabrication flaws in the dental prostheses. Milling excludes waxing, investing, and casting of the prosthesis which improve the overall precision.…”

Section: Discussionmentioning

confidence: 99%

Comparative Stress Analysis Study Of CAD/CAM Milled PEEK And Zirconia Primary Copings In Double Crown PEEK Framework Mandibular Partial Denture After 1 Year Simulated Function

Homossany

Mohamed

2023

Egyptian Dental Journal

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Aim of the study: The objective was to assess and compares the effect of PEEK and Zirconia primary copings in milled double crown PEEK framework. Materials and methods: One cast was fabricated simulating Kennedy Class I with the premolars as the last standing abutment. The primary copings were classified into two groups, milled PEEK group I and milled Zirconia group II. Two milled PEEK frameworks were used. Four strain gauges were installed bilaterally in the model. A load of 100 N was applied to the area of the first molar bilaterally. The same procedure was repeated 10 times. Cyclic loading was applied simulating 1 year of function. Strains induced on the abutments during bilateral loading were evaluated before and after chewing simulation. Results: The highest compressive micro-strain was recorded at channel (4) after cyclic loading for PEEK group 359.00±5.055 µm/m followed by channel (2) 356±13.293 µm/m. While the least compressive micro-strain was recorded at channel (1) before cyclic loading for the Zirconia was 150±7.817 µm/m. There was significant difference in channels ( 2) and (4) regarding PEEK group before and after cyclic loading. While for Zirconia group there was significance difference in channels ( 1) and (3) before and after cyclic loading where P value was<0.05. There was significant difference in all the channels before and after cyclic loading. Conclusion: PEEK and Zirconia primary copings showed different distribution of stress, as PEEK primary coping transmitted more stress to the supporting structures.

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“…However, the combination of zirconia with non-precious alloy secondary crowns has been reported to cause significant wear and loss of friction [ 5 ]. Studies testing zirconia as a secondary crown material have reported contradictory findings [ 14 ], and further studies are necessary for more accurate results and for providing reliable recommendations.…”

Section: Introductionmentioning

confidence: 99%

Impact of material combinations and removal and insertion cycles on the retention force of telescopic systems

Soldatovic¹,

Bitter²,

Meinen³

et al. 2023

Clin Oral Invest

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Objectives A variety of dental materials are available for the fabrication of telescopic crowns. The aim was to investigate the impact of material combinations and removal and insertion cycles on their retention forces. Materials and methods CAD/CAM-fabricated cobalt–chromium–molybdenum (CoCr) and zirconia (ZrO2) primary crowns were combined with polyetheretherketone (PEEK), polyetherketoneketone (PEKK), CoCr, and ZrO2 secondary crowns (four combinations included PEEK/PEKK secondary crowns in a thickness of 0.5 mm bonded to the CoCr tertiary construction), resulting in 12 different material combinations: CoCr–PEEK; CoCr–PEKK; CoCr–ZrO2; CoCr–CoCr; CoCr–PEEK 0.5; CoCr–PEKK 0.5; ZrO2–PEEK; ZrO2–PEKK; ZrO2–ZrO2, ZrO2–CoCr; ZrO2–PEEK 0.5; and ZrO2–PEKK 0.5 (n = 15 pairings per material combination). Pull-off tests were performed with a universal testing machine initially and after 500, 5000, and 10,000 removal and insertion cycles in a mastication simulator. Descriptive statistics with the Kolmogorov–Smirnov, Kruskal–Wallis, and Mann–Whitney U tests were computed (α = 0.05). Results The tested parameters, material combination, and removal and insertion cycles had significant impact on the retention force values (p < 0.001). An increase in removal and insertion cycles was associated with a decrease in retention forces within CoCr and ZrO2 secondary crowns, regardless of the primary crown material. In contrast, PEEK and PEKK secondary crowns presented higher retention load values after 10,000 cycles than initially. Conclusion Different material combinations behaved differently after simulated removal and insertion regimens. This difference should be considered during treatment planning. Clinical relevance Telescopic crown systems should be made of materials with predictable retention forces that do not deteriorate with time. The implementation of new materials and technologies facilitates reproducibility and time-saving fabrication.

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Parameters Affecting the Retention Force of CAD/CAM Telescopic Crowns: A Focused Review of In Vitro Studies

Cited by 7 publications

References 52 publications

Evaluation of retention and wear resistance of different telescopic crown attachment materials in implant retained overdenture (an in vitro study)

Evaluation of retention and wear resistance of different telescopic crown attachment materials in implant retained overdenture (an in vitro study)

Comparative Stress Analysis Study Of CAD/CAM Milled PEEK And Zirconia Primary Copings In Double Crown PEEK Framework Mandibular Partial Denture After 1 Year Simulated Function

Impact of material combinations and removal and insertion cycles on the retention force of telescopic systems

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