Thermal Fatigue in Teeth

Brown, Wayne; Jacobs, Hans; Thompson, R.E.

doi:10.1177/00220345720510023601

Cited by 120 publications

(70 citation statements)

References 6 publications

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“…In addition, it is reported that bovine teeth are more susceptible to thermal fatigue and crack propagation after thermocycling than human teeth. 18) However, ultimate tensile strength and elastic modulus of bovine teeth are not significantly different from those of human teeth, 19) and bovine teeth facilitate to ensure large number of immature incisors of similar sizes. Immature permanent teeth have open and even divergent apical morphology, thin and weakened root dentin wall because of arrested tooth development.…”

Section: ⅳ Discussionmentioning

confidence: 99%

Influence of post types and sizes on fracture resistance in the immature tooth model

Kim

Park

et al. 2010

J Korean Acad Conserv Dent

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The purpose of this study was to determine the effect of post types and sizes on fracture resistance in immature tooth model with various restorative techniques. Bovine incisors were sectioned 8 mm above and 12 mm below the cementoenamel junction to simulate immature tooth model. To compare various postand-core restorations, canals were restored with gutta-percha and resin core, or reinforced dentin wall with dual-cured resin composite, followed by placement of D.T. LIGHT-POST, ParaPost XT, and various sizes of EverStick Post individually. All of specimens were stored in the distilled water for 72 hours and underwent 6,000 thermal cycles. After simulation of periodontal ligament structure with polyether impression material, compressive load was applied at 45 degrees to the long axis of the specimen until fracture was occurred.Experimental groups reinforced with post and composite resin were shown significantly higher fracture strength than gutta-percha group without post placement (p < 0.05). Most specimens fractured limited to cervical third of roots. Post types did not influence on fracture resistance and fracture level significantly when cement space was filled with dual-cured resin composite. In addition, no statistically significant differences were seen between customized and standardized glass fiber posts, which cement spaces were filled with resin cement or composite resin individually. Therefore, root reinforcement procedures as above in immature teeth improved fracture resistance regardless of post types and sizes. [J Kor Acad Cons Dent 35(4):257-266, 2010]

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Section: ⅳ Discussionmentioning

confidence: 99%

Influence of post types and sizes on fracture resistance in the immature tooth model

Kim

Park

et al. 2010

J Korean Acad Conserv Dent

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“…As suggested by Gale and Darvell, a total number of 1000 cycles of thermocycling between 5°C and 55°C was applied on the samples kept in distilled water with a stopping time of 50 seconds in each of hot and cold environments [30]. According to a study by Brown et al [31], ten cycles of thermocycling on a sample is equivalent to placing in the oral conditions for a day. Thus, 1000 cycles of thermocycling selected in this research is equivalent to putting the sample inside the patient's mouth for 100 days.…”

Section: Methodsmentioning

confidence: 99%

Mechanical Properties of a Dental Nano-Composite in Moist Media Determined by Nano-Scale Measurement

Karimzadeh¹,

Ayatollahi²,

Shirazi³

2014

IJMMM

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Abstract-The aim of this study was to evaluate the influence of thermocycling on the mechanical properties of a commercial dental nanocomposite by using the nano-indentation experiment. The resin-based nanocomposite contained silica and zirconia nanofillers. Some disk specimens, each with the diameter of 10 mm and the thickness of 4 mm were prepared and the specimens were stored at various environmental conditions. Some of the samples were kept in the ambient condition, other samples were stored in distilled water at room temperature and other ones were thermocycled in distilled water for 1000 cycles between 5°C and 55°C. After preparation of samples, the nano-indentation test was applied on the prepared specimens by Triboscope setup. Then the modulus of elasticity and hardness of the test samples were calculated from the Oliver-Pharr's method using the data obtained from nano-indentation test. The present research showed that the samples stored in distilled water without thermocycling exhibited the highest elasticity modulus when compared to the other samples. In addition, the maximum hardness was observed for thermocycled specimens in distilled water.

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“…19,20 However, the number of cycles used seems to be a determining variable. 19,21 Thermal cycling exerts the same effect on cement, i.e., the difference in the coefficient of linear thermal expansion between tooth, cement and metal causes distinct movements of these substances, which in turn lead to fracture of the interlocking materials and, consequently, a reduction in tensile bond strength. Brown et al 19 (1972) showed that 3,650 cycles corresponded to one year of aging.…”

Section: Discussionmentioning

confidence: 99%

Effect of ultrasonic instrumentation on the bond strength of crowns cemented with zinc phosphate cement to natural teeth. An in vitro study

Filho¹,

Mori

Jardini³

et al. 2008

Braz. oral res.

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Several studies have reported the benefits of sonic and/or ultrasonic instrumentation for root debridement, with most of them focusing on changes in periodontal clinical parameters. The present study investigated possible alterations in the tensile bond strength of crowns cemented with zinc phosphate cement to natural teeth after ultrasonic instrumentation. Forty recently extracted intact human third molars were selected, cleaned and stored in physiologic serum at 4°C. They received standard preparations, at a 16º convergence angle, and AgPd alloy crowns. The crowns were cemented with zinc phosphate cement and then divided into four groups of 10 teeth each. Each group was then subdivided into two subgroups, with one of the subgroups being submitted to 5,000 thermal cycles ranging from 55 ± 2 to 5 ± 2°C, while the other was not. Each group was submitted to ultrasonic instrumentation for different periods of time: group 1 -0 min (control), group 2 -5 min, group 3 -10 min, and group 4 -15 min. Tensile bond strength tests were performed with an Instron testing machine (model 4310). Statistical analysis was performed using ANOVA and Tukey's test at the 5% level of significance. A significant reduction in the tensile bond strength of crowns cemented with zinc phosphate and submitted to thermal cycles was observed at 15 min (196.75 N versus 0 min = 452.01 N, 5 min = 444.23 N and 10 min = 470.85 N). Thermal cycling and ultrasonic instrumentation for 15 min caused a significant reduction in tensile bond strength (p < .05).

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Thermal Fatigue in Teeth

Cited by 120 publications

References 6 publications

Influence of post types and sizes on fracture resistance in the immature tooth model

Influence of post types and sizes on fracture resistance in the immature tooth model

Mechanical Properties of a Dental Nano-Composite in Moist Media Determined by Nano-Scale Measurement

Effect of ultrasonic instrumentation on the bond strength of crowns cemented with zinc phosphate cement to natural teeth. An in vitro study

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