A Critical Evaluation of Fatigue Studies for Restorative Materials in Dentistry

Rosentritt, Martin; Behr, Michaël; Preis, Verena

doi:10.1007/s40496-016-0097-8

Cited by 20 publications

(16 citation statements)

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“…9 Reviewing fatigue studies shows substantial variations in testing setup; experimental variables such as indenter material and size, periodontal ligament simulation, abutment material, number of cycles, and thermocycling regime vary considerably. [10][11][12][13] The influence of these variables on the results of the simulation studies has not been investigated sufficiently in the literature. Therefore, many studies tend to simulate all variables; however, others choose to simplify the design because of the difficulty in controlling and standardizing all testing parameters.…”

Section: Introductionmentioning

confidence: 99%

Influence of Antagonist Material on Fatigue and Fracture Resistance of Zirconia Crowns

et al. 2020

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Objective This study investigates the influence of the most commonly used indenter materials on fatigue survival and fracture resistance of zirconia crowns. Materials and Methods A total of 40 zirconia crowns were prepared using computer-aided design (CAD)/computer-aided manufacturing (CAM) technology: 30 crowns were divided into three experimental groups of 10 specimens and the last 10 specimens acted as the control group. The experimental groups were subjected to chewing simulation with simultaneous thermocycling. Three indenter materials (steatite ceramic, stainless steel, and tungsten carbide) with identical diameter were used to load the specimens. All crowns were then subjected to single load to fracture test in universal testing machine. Load was applied vertically with a crosshead speed of 1 mm/min until failure, and fracture load was recorded. Statistical Analysis Normal distribution of data was confirmed using the Shapiro–Wilk test. Descriptive statistics including means and standard deviations were determined for all groups. Differences between groups were tested using Dunnett’s test and paired sample t-test. Results Chewing simulation for 1.2 million cycles resulted in 100% survival. The highest mean fracture load was recorded for the control group and the lowest one was for the group fatigued with stainless steel indenter. Chewing simulation statistically significantly (p < 0.05) reduced the mean fracture load of the crowns fatigued with stainless steel and steatite ceramic indenter. However, the mean fracture load for the crowns fatigued with tungsten carbide was not significantly different from that of the control group. Conclusion Steatite ceramic and stainless steel indenters produced close results and significantly reduced fracture load of zirconia crowns. However, tungsten carbide indenter caused nonsignificant reduction in the fracture load of zirconia crowns.

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Section: Introductionmentioning

confidence: 99%

Influence of Antagonist Material on Fatigue and Fracture Resistance of Zirconia Crowns

et al. 2020

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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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“…Fatigue tests have been presented as an efficient method for the evaluation of the mechanical properties of long-term dental materials [3,[16][17][18]. This type of test promotes the occurrence of chemical phenomena like slow crack growth, mechanical process degradation such as "hydraulic pumping", and internal friction in the walls of microcracks that occur in ceramic materials [18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%