Nonprecious Alloy vs Precious Alloy Telescopic Crown–Retained Removable Partial Dentures: Survival and Maintenance Needs

Zierden, Karina; Kurzrock, Luisa; Wöstmann, Bernd; Rehmann, Peter

doi:10.11607/ijp.5820

Cited by 10 publications

(12 citation statements)

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“…The difference between the casted and milled groups was mainly attributed to the higher accuracy and the lower surface roughness of the milled group [ 18 ]. The material combination NPA/NPA has also been evaluated in a retrospective clinical study and while the authors of that study did not observe a difference in denture survival, the abutment survival rate was significantly higher in the control group using PA/PA telescopic crowns [ 36 ]. However, the manufacturing technique of the NPA/NPA crowns has not been reported in that specific study.…”

Section: Discussionmentioning

confidence: 99%

Retention forces between primary and secondary CAD/CAM manufactured telescopic crowns: an in vitro comparison of common material combinations

et al. 2021

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Objectives To analyze the retention forces between primary and secondary telescopic crowns milled from various materials and to compare them with the retention forces between cast telescopic crowns made of precious metal alloys. Materials and methods Primary and secondary crowns (N = 60; n = 10 per group) were fabricated using various material combinations (1: zirconia [ZIR]/polyether ether ketone [PEEK]; 2: titanium grade IV [TI]/PEEK; 3: PEEK/PEEK; 4: non-precious alloy [NPA]/PEEK; 5:NPA/NPA), while precious alloy (PA) was used for the control group (6: PA/PA). The retention forces at 10, 1000, 5000, and 10,000 connection and disconnection cycles and the relative weights were analyzed, applying nonparametric repeated measures ANOVA and post hoc Mann–Whitney and Wilcoxon signed-rank tests (α < 0.05). Results Globally, significant differences in the retention forces among the materials (p < 0.0001), time points (p < 0.0001), and wear resistance for the various materials (p < 0.0001) were observed. No significant changes in retention forces compared to baseline were observed in groups 2, 4, 5, and 6. A significantly higher weight loss for both primary and secondary crowns was observed in groups 4 and 6. Conclusions The material combination in telescopic attachments influences retention forces and wear. Interactions between materials and time were evident, indicating that the change in retention forces differs among the materials. The combinations of milled TI/PEEK and NPA/NPA qualify for further preclinical testing in a more clinically realistic setup, determining a material-specific double-crown design. Clinical relevance The design of precious alloy telescopic crowns cannot be directly transferred to other milled material combinations due to different retention behaviors.

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Section: Discussionmentioning

confidence: 99%

Retention forces between primary and secondary CAD/CAM manufactured telescopic crowns: an in vitro comparison of common material combinations

et al. 2021

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“…The combination of removable and fixed dentures with double crowns as anchoring elements, both on natural abutments and implants, has proven itself over decades as a treatment modality [ 1 , 2 , 3 , 4 , 5 ]. Their advantages include circular and rigid support of the abutment teeth, adequate retention, their supporting and leading function combined with acceptable aesthetics, simple handling and cost-effective extensibility [ 3 , 4 ].…”

Section: Introductionmentioning

confidence: 99%

Retention Force of Removable Partial Dentures with CAD-CAM-Fabricated Telescopic Crowns

et al. 2020

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The aim of this study was to compare the retention forces after artificial aging of telescopic crowns fabricated either by a conventional lost-wax technique or by computer-aided design/computer-aided manufacturing (CAD-CAM) technology. Two types of telescopic crowns (0°) were fabricated conventionally using high-noble (group A) and non-precious metal (group B). CAD-CAM fabricated telescopic crowns (0°) were made of non-precious metal (group C). Retention forces were assessed before and after artificial aging and after axial and non-axial loading. Initially [I.] and after artificial aging [IV.], specimens of group C (I. 16.2 N; IV. 13.6 N) exhibited the highest retention forces. The retention forces in groups B (I. 12.5 N; IV. 4.6 N) and A (I. 9.6 N; IV. 2.9 N) were found to be lower than those of group C. The retention force differences between the groups were statistically significant (p < 0.001) at all measurement times [I. vs. IV.]. Different fabricated telescopic crowns with approximately identical designs and materials exhibited different retention forces and different long-term retentive behavior. An optimized CAD-CAM process with individually defined design parameters ensured telescopic crowns with a better fit. These findings might influence prospective clinical decision-making.

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“…Several studies have reported a high rate of technical failure with this type of prosthesis [6,17,21,36]. Follow-up, periodic evaluation, and maintenance are required to overcome problems with technical malfunctions, cervical caries, and retention [37] [21].…”

Section: Telescopic Crown Disadvantagesmentioning

confidence: 99%

Telescopic double crowns in prosthodontics

Kara

2021

IJDR

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The purpose of this article is to classify the types of telescopic prostheses that protect natural teeth as an alternative to traditional removable prostheses, and to explain their advantages, disadvantages, indications and clinical significance in order to minimize the problems of removable dentures. Telescopic prostheses consist of an inner (primary) crown permanently cemented to an abutment and an outer (secondary) crown attached to the prosthesis. Primary crowns protect the abutment from bruises and thermal irritation, and also provide retention and stabilization of the secondary crown. The secondary crown combines the primary crown with the prosthesis to form a telescopic unit, providing prosthetic retention and stability.

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Nonprecious Alloy vs Precious Alloy Telescopic Crown–Retained Removable Partial Dentures: Survival and Maintenance Needs

Abstract: The type of alloy seems to have no impact on TRPD survival, but seems to have an influence on the survival of the abutment teeth. There are also differences in maintenance between NPA- and PA-TRPDs.

Cited by 10 publications

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Retention forces between primary and secondary CAD/CAM manufactured telescopic crowns: an in vitro comparison of common material combinations

Retention forces between primary and secondary CAD/CAM manufactured telescopic crowns: an in vitro comparison of common material combinations

Retention Force of Removable Partial Dentures with CAD-CAM-Fabricated Telescopic Crowns

Telescopic double crowns in prosthodontics

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