ADM guidance-ceramics: Fatigue principles and testing

Kelly, J. Robert; César, Paulo Francisco; Scherrer, Susanne S.; Bona, Álvaro Della; Noort, Richard van; Tholey, M.J.; Vichi, Alessandro; Lohbauer, Ulrich

doi:10.1016/j.dental.2017.09.006

Cited by 129 publications

(59 citation statements)

References 77 publications

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“…Ideally, fatigue or aging should be tested by cyclic loading until fracture [31]. Very few previous studies have shown any effect of cyclic loading at sub-critical load prior to quasi-static loading.…”

Section: Aging Proceduresmentioning

confidence: 99%

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Monolithic zirconia crowns – wall thickness, surface treatment and load at fracture

Øilo

Schriwer

Flinn

et al. 2019

Biomaterial Investigations in Dentistry

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Purpose: The aim of this study was to evaluate the effect of wall thickness on load at fracture of monolithic zirconia dental crowns after aging. Materials and Methods: Seventy translucent monolithic zirconia crowns (DD Bio ZX 2 , Dental Direkt GmbH) were produced to fit a second upper premolar preparation with a circumferential shallow chamfer. Thirty crowns had a minimum wall thickness of 0.4 mm and 40 had 0.8 mm. TwentyAQ4 of the thick-walled crowns were glazed. The remaining crowns were polished. Ten crowns from each group functioned as controls, while the remaining were subjected to an aging procedure of alternation between dynamic loading and autoclaving. The surviving crowns were assessed for margin damages and surface wear before beeing subjected to quasi-static loading until fracture. All fractures were analyzed by fractographic methods. Results: There were statistically significant differences among the test groups concerning the effects of aging and surface wear. All thick-walled and eight of the thin-walled crowns survived the aging procedure. All fracture origins both from dynamic and quasi-static loading were located in the cervical margin with crack propagation corresponding to cervical hoop stress as observed in clinical failures. Conclusions: Thin-walled translucent monolithic zirconia crowns were more affected by the aging procedure than thick-walled crowns.

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Section: Aging Proceduresmentioning

confidence: 99%

“…Aging of zirconia crowns has been investigated by a large number of in vitro trials [20,22,[35][36][37][38]. However, there is no consensus regarding the method to mimic a clinically relevant aging [31]. High temperature, thermo-cycling and cyclic loading have all been used to provoke aging, either alone or in different combinations.…”

Section: Aging Proceduresmentioning

confidence: 99%

Monolithic zirconia crowns – wall thickness, surface treatment and load at fracture

Øilo

Schriwer

Flinn

et al. 2019

Biomaterial Investigations in Dentistry

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“…3,11 Many articles have been published in the past few years providing valuable input in understanding this topic and guiding new research. 1,10,12,13 Nevertheless, reviewing recent publications shows considerable variations in fatigue testing methodologies, which make the comparability of results a serious challenge. Fatigue testing studies vary in many aspects such as the number and frequency of cycles, abutment and antagonist materials, periodontal ligament (PDL) simulation, and sometimes thermocycling protocols.…”

Section: Introductionmentioning

confidence: 99%

In vitro Simulation of Periodontal Ligament in Fatigue Testing of Dental Crowns

et al. 2020

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Abstract Objective Fatigue testing of restorative material has been appreciated as an appropriate method to evaluate dental restorations. This study aims to investigate the influence of periodontal ligament (PDL) simulation on fatigue and fracture tests results of zirconia crowns. Materials and Methods A standard tooth preparation for all ceramic zirconia crown was made on a typodont mandibular molar. The prepared master die was duplicated using epoxy resin to produce 40 replicas. PDL simulation was made by surrounding the root of 20 dies with a 0.3-mm thick silicon layer. The other 20 specimens had no PDL simulation. Zirconia crowns were fabricated using computer-aided design/computer-aided manufacturing technology and cemented to the epoxy resin dies. Ten crowns from each group were subject to chewing simulation with simultaneous thermocycling (5–55°C). All specimens were then loaded until failure in universal testing machine. Statistical Analysis Statistical analysis was conducted using SPSS software. Shapiro–Wilk test confirmed the normal distribution of data. Descriptive statistic was performed and differences between the groups were analyzed using paired samples t-test. Results All fatigued crowns survived chewing simulation; no failure was observed after finishing simulation. The highest mean fracture load recorded was 3,987 ± 400 N for the no fatigue/no periodontal simulation group. Comparing the mean fracture load of the two groups with periodontal simulation and the two groups with no periodontal simulation showed no statistically significant difference (p > 0.5). Conclusion Considering the testing set-up applied in this study, simulating PDL using resilient materials does not affect the in vitro survival and fracture resistance of zirconia crowns.

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“…In addition, Kelly et al [20] developed an in vitro test assembly that better simulates the failure mechanism and stress state observed in clinically retrieved failed prostheses (e.g. radial cracks starting from the cementation surface -tensile side) [21].…”

Section: Introductionmentioning

confidence: 99%