Fracture resistance of CAD-CAM all-ceramic surveyed crowns with different occlusal rest seat designs

Chaturvedi, Saurabh; Alqahtani, Turki A; Alsolami, Saleh; Alqahtani, Abdulbari; Das, Gotam; Alsubaiy, Ebrahim Fihaid

doi:10.4047/jap.2021.13.1.36

Cited by 11 publications

(5 citation statements)

References 29 publications

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“…One of the most important qualities of clasps is their retention force, which will resist the removable prosthesis’ dislodging force during masticatory function and muscle movement. When assessing the fit of a clasp material to the retentive area, the clasp shape (length, width), flexibility, and undercut engagement should be considered [ 27 ]. The optimum performance of a clasp depends on the balance between these variables.…”

Section: Discussionmentioning

confidence: 99%

Retentive Forces and Deformation of Fitting Surface in RPD Clasp Made of Polyether-Ether-Ketone (PEEK)

et al. 2023

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Background: Polyetheretherketone (PEEK) has provided the option to fabricate RPDs with aesthetics unlike metal RPDs, but little attention has been paid to its suitability, especially towards the retentive forces and deformation of the clasp. This study aimed to examine the retentive forces and the fitting surface (inner surface) deformation of clasps made from PEEK and compare it with cobalt–chromium (Co-Cr) clasp. Methods: Forty-two circumferential clasps (14 Co-Cr and 28 PEEK) were fabricated and divided into two groups with clasp undercuts (0.25 mm and 0.5 mm) with thicknesses of 1 mm and 1.5 mm. Each was examined for retentive forces after cycle test on its abutment for 360 cycles. Initial and final retentive forces were recorded. The fitting surface deformation was determined using 3-Matic research analysis software. Results: The results revealed that highest mean initial retentive force was of Co-Cr clasps with 0.50 mm undercut 22.26 N (±10.15 N), and the lowest was the 1 mm PEEK clasps with 0.25 mm undercut 3.35 N (±0.72 N) and highest mean final retentive force was the Co-Cr clasps with 0.50 mm undercut 21.40 N (±9.66 N), and the lowest was the 1 mm PEEK clasps with 0.25 mm undercut 2.71 N (±0.47 N). PEEK clasps had a lower retentive force than Co-Cr clasps with 0.50 undercut. PEEK clasps (1.5 mm) at 0.25 mm undercut had the least deformation (35.3 µm). PEEK showed significantly less deformation (p ≤ 0.014) than Co-Cr. Conclusion: The deformation of PEEK clasps fitting surface was lower than Co-Cr clasps and retentive forces were close to the Co-Cr clasps, suggesting the use of PEEK as an aesthetic clasp option for RPD framework.

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Section: Discussionmentioning

confidence: 99%

Retentive Forces and Deformation of Fitting Surface in RPD Clasp Made of Polyether-Ether-Ketone (PEEK)

et al. 2023

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“…Another significant theoretical implication of the present study is the use of TAM in explaining the intended behavior of academicians to use e-learning. Many previous studies have used TAM to measure the intention of students to use e-learning methods such as social media, m-learning, and Internet learning [ 41 , 80 , 81 , 82 , 83 , 84 , 85 , 86 ]. However, studies lack the use of TAM to explore the behavioral intentions of academicians.…”

Section: Discussionmentioning

confidence: 99%

Challenges of E-Learning: Behavioral Intention of Academicians to Use E-Learning during COVID-19 Crisis

Khan

Reddy

Khan

et al. 2023

JPM

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The COVID-19 crisis demanded that all educational activities should be performed virtually to follow social distancing guidelines. Therefore, there was a need to perform a research study to assess the effects of external factors on the perceived usefulness, ease of use of e-learning, and the further effect of these perceptions on attitude and intent to use e-learning by using the technology acceptance model (TAM) among academicians at higher education institutions in the Kingdom of Saudi Arabia. Methods: A cross-sectional study was conducted, and data were collected from 263 academicians across Saudi Arabia through an online survey questionnaire using a non-probability purposive sampling technique and analyzed and tested using the SPSS and Smart PLS software. Results: This study found that self-efficacy was positively associated with perceived usefulness at β = 0.143 and p < 0.05, but it had no association with perceived ease of use at β = 0.057 at p > 0.05. System accessibility had a significant and positive relationship with perceived usefulness and perceived ease of use at β = 0.283, β = 0.247, and p < 0.01, respectively. Self-efficacy had a positive effect on perceived usefulness, whereas the subjective norm had no relationship with perceived usefulness and perceived ease of use at β = −0.065 and β = −0.012 at p > 0.05, respectively. Perceived ease of use and perceived usefulness were positively related to attitude towards use, which has a significant influence on intention to use e-learning. Conclusion: Perceived ease of application is the most significant factor (β = 0.556) in developing the attitude among academicians to practice e-learning, followed by perceived usefulness (β = 0.262). Moreover, it can be concluded that system accessibility has a stronger influence on developing perception among academicians about the expediency and ease of application of e-learning than self-efficacy.

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“…A recent study evaluated the fracture resistance of surveyed CAD‐CAM zirconia crowns fabricated out of two different brands (ZirCAD and Ceramill Zolid ZLHT) for maxillary first premolars. In the study, the authors compared a narrow disto‐occlusal rest housing 1/2 of the buccolingual width and a wide disto‐occlusal rest taking 2/3 of the buccolingual width, and the results concluded that narrow rest seat provided higher resistance for both types of zirconia brands (ZirCAD 3476 N; ZLHT 2666.70 N) than the crowns with wider occlusal rest seat (ZirCAD 2968 N; ZLHT 2083 N) 38 . Similarly, the results of the present study concurs with those results because the design with the widest rest seat (interproximal rest seat) had the lowest fracture resistance (2723 N) of all the rest seat design.…”

Section: Discussionmentioning

confidence: 99%

Fracture resistance of zirconia surveyed crowns with four different occlusal rest seat designs

Jurado

Ahmed

Lawson

et al. 2023

Journal of Prosthodontics

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PurposeTo determine the fracture resistance of chairside computer‐aided design and computer‐aided manufacturing (CAD‐CAM) zirconia surveyed crowns for a mandibular first molar without occlusal rest and with four different rest seat designs.Materials and MethodsSeventy CAD‐CAM zirconia 4Y‐PSZ (IPS e.max ZirCAD MT for CEREC A1, C15, Ivoclar Vivadent) crowns (14 specimens/group) were designed and fabricated with a dental chairside CAD‐CAM system (CEREC PrimeScan, and CEREC MCXL Dentsply Sirona). The restorations were divided into groups according to the following rest seat designs: (1) Surveyed crown without rest seat, (2) surveyed crowns with disto‐occlusal rest seat, (3) surveyed crowns with disto‐occlusal extended rest seat, (4) surveyed crowns with interproximal rest seat, and (5) continuous rest seat. Crowns were treated with a primer system (Monobond Plus, Ivoclar Vivadent) and cemented using resin luting cement (Multilink Automix, Ivoclar Vivadent) to resin‐printed dies (Grey Resin V4, FormLabs). Subsequently, the crowns were subjected to 200,000 load cycles at 1 Hz with 20 N force and then loaded with a steel indenter until fracture. The test results were analyzed with one‐way Analysis of Variance (ANOVA) and HSD Tukey post‐Hoc test.ResultsThe mean fracture resistance of surveyed crowns without and with different rest seats was significantly different from each other. Surveyed crowns with no rest seat displayed the highest resistance (4238 N) followed by crowns with continuous rest seat (3601 N), crowns with disto‐occlusal extended rest seat (3283 N), and crowns with disto‐occlusal rest seat (3257 N). Crowns with interproximal rest seat displayed the lowest fracture resistance (2723 N).ConclusionsSurveyed crowns without rest seats had a higher fracture resistance than crowns with rest seats Surveyed crowns with interproximal rest seats presented the lowest fracture resistance among all rest seat designs. Crowns with disto‐occlusal rest seats, disto‐occlusal extended rest seats, and continuous rest seats displayed similar fracture resistance.

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Fracture resistance of CAD-CAM all-ceramic surveyed crowns with different occlusal rest seat designs

Cited by 11 publications

References 29 publications

Retentive Forces and Deformation of Fitting Surface in RPD Clasp Made of Polyether-Ether-Ketone (PEEK)

Retentive Forces and Deformation of Fitting Surface in RPD Clasp Made of Polyether-Ether-Ketone (PEEK)

Challenges of E-Learning: Behavioral Intention of Academicians to Use E-Learning during COVID-19 Crisis

Fracture resistance of zirconia surveyed crowns with four different occlusal rest seat designs

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