Maximum voluntary bite force, occlusal contact points and associated stresses on posterior teeth

Vuuren, Ludwig Jansen van; Broadbent, Jonathan M.; Duncan, Warwick; Waddell, John Neil

doi:10.1080/03036758.2019.1691612

Cited by 20 publications

(14 citation statements)

References 25 publications

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“…The mammalian tooth is a rugged structure capable of withstanding extreme forces (Jansen van Vuuren et al 2020) generated during mastication (Shimada et al 2012). Its specialized anatomy includes an outer layer of enamel, the hardest known biomaterial (Engel 2017), in keeping with a need to preserve its functional integrity.…”

Section: Discussionmentioning

confidence: 99%

Transcriptomic Classification of Neurons Innervating Teeth

2020

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Toothache is a common painful consequence of damage to the teeth, particularly when coupled to infection. Clinical restoration of tooth integrity, sometimes involving physical and chemical sterilization of the tooth with nerve fiber ablation (i.e., endodontic therapy), generally alleviates pain and allows long-lasting dental function. These observations raise questions regarding the biological role of tooth-innervating fibers. Here, we determined the transcriptomic diversity of the sensory neurons that can be retrogradely labeled from mouse molar teeth. Our results demonstrate that individual molars are each targeted by a dedicated population of about 50 specialized trigeminal neurons. Transcriptomic profiling identifies the majority of these as expressing markers of fast-conducting neurons, with about two-thirds containing nociceptive markers. Our data provide a new view of dental innervation, extending previous reports that used candidate gene approaches. Importantly, almost all retrogradely labeled neurons, including nociceptors, express the recently characterized mechanosensor Piezo2, an ion channel that endows cells with sensitivity to gentle touch. Intriguingly, about a quarter of the labeled neurons do not appear to be nociceptors, perhaps insinuating a role for them in discriminative touch. We hypothesize that dental neurons are capable of providing mechanosensitive information to drive rapid behavioral responses and protect teeth from damage. Damage to the teeth and exposure of the large population of molar nociceptors may trigger prolonged or abnormal activation driving toothache. Future studies examining the responses of these transcriptomically defined classes of neurons will help define their significance in oral sensation.

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Section: Discussionmentioning

confidence: 99%

Transcriptomic Classification of Neurons Innervating Teeth

2020

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“…This newly introduced glass ceramic, besides from outstanding aesthetics, has mechanical properties similar and even higher than lithium disilicate [ 13 ]. On the other hand, zirconia, a polycrystalline ceramic with no amorphous glassy phase, has drawn lots of attention to its superb mechanical characteristics [ 14 – 16 ], especially as a material to be used in high-stress conditions [ 17 , 18 ]. Zirconia cannot be etched by routine methods, and its retention in partial coverage restorations, like endocrown, is not as reliable as other ceramics.…”

Section: Introductionmentioning

confidence: 99%

Comparison of retention and fracture load of endocrowns made from zirconia and zirconium lithium silicate after aging: an in vitro study

et al. 2022

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Background This study aimed to compare retention and fracture load in endocrowns made from translucent zirconia and zirconium lithium silicate. Methods Fifty-six intact human maxillary molars after being mounted in acrylic resin, were scanned to acquire biogeneric copies. Specimens underwent standard endodontic treatment and were prepared for endocrown up to 2 mm above the cementoenamel junction. The specimens were randomly divided into two groups of 28, and endocrowns were designed using biogeneric copies and milled from high-translucent zirconia disks (Zr) and zirconium lithium silicate blocks (ZLS). After cementation with dual-cure resin cement, all the specimens underwent thermomechanical aging, and pull-out retention test and compressive test were conducted (14 specimens were used for each test in each group, n = 14), and failure modes in both tests were evaluated. Results Independent samples t-test showed significant difference between the retention of Zr (271.5 N ± 114.31) and ZLS (654.67 N ± 223.17) groups (p value = 0.012). Compressive test results were also significantly different between Zr (7395.07 N ± 1947.42) and ZLS (1618.3 N ± 585) (p = 0.002). Failure mode of retention test was primarily adhesive failure at the cement-restoration interface in Zr group and cement-tooth interface in ZLS group. Failure modes of fracture test for Zr group were 7 non-restorable fractures and one restorable fracture while 6 specimens resisted compressive loads up to 8500 N without fracture. ZLS group showed 7 restorable and 7 non-restorable failures. Conclusions Zr endocrowns showed significantly lower retention and higher fracture strength. Both materials seem to be suitable for fabrication of endocrown in clinical setup.

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“…Both groups in the present study showed su cient fracture resistances to be used in endocrown restorations in clinical cases. However, maximum voluntary bite forces up to 1642.8 N was recorded in Jansen van Vuuren et al study which is higher than mean fracture load of ZLS group, but lower than Zr group [15]; therefore, it seems in high stress cases like bruxism, zirconia is a more reliable option to be used in endocrown fabrication.…”

Section: Discussionmentioning

confidence: 80%

“…This newly introduced glass ceramic, besides from outstanding aesthetics, has mechanical properties similar and even higher than lithium disilicate [11]. On the other hand, zirconia, a polycrystalline ceramic with no amorphous glassy phase, has drawn lots of attention to its superb mechanical characteristics [12][13][14], especially as a material to be used in high stress conditions [15,16]. Zirconia cannot be etched by routine methods and its retention in a partial coverage restoration like endocrown is not as reliable as other ceramics.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Retention and Fracture Load of Endocrowns Made from Zirconia and Zirconium Lithium Silicate After Aging: An in-Vitro Study

Sahebi

Ghodsi

Berahman

et al. 2021

Preprint

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Background: This study aimed to compare retention and fracture load in endocrowns made from zirconium lithium silicate and translucent zirconia.Methods: Fifty-six intact human maxillary molars after being mounted in acrylic resin, were scanned to acquire biogeneric copies. Specimens underwent standard endodontic treatment and were prepared for endocrown up to 2 mm above the cementoenamel junction. The specimens were randomly divided into two groups of 28 and endocrowns were designed using biogeneric copies and milled from high-translucent zirconia disks (Zr) and zirconium lithium silicate blocks (ZLS). After cementation with dual cure resin cement, all the specimens underwent thermomechanical aging and pull-out retention test and compressive test were conducted (14 specimens were used for each test in each group, n=14) and failure modes in both tests were evaluated.Results: Independent samples t-test showed significant difference between the retention of Zr (271.5 N ±114.31) and ZLS (654.67 N ±223.17) groups (p value = 0.012). Compressive test results were also significantly different between Zr (7395.07 N ±1947.42) and ZLS (1618.3 N ±585) (p = 0.002). Failure mode of retention test was primarily adhesive failure at the cement-restoration interface in Zr group and cement-tooth interface in ZLS group. Failure modes of fracture test for Zr group were 7 non-restorable fractures and one restorable fracture while 6 specimens resisted compressive loads up to 8500 N without fracture. ZLS group showed 7 restorable and 7 non-restorable failures.Conclusions: Zr endocrowns showed significantly lower retention and higher fracture strength. Both materials seem to be suitable for fabrication of endocrown in clinical setup.

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Maximum voluntary bite force, occlusal contact points and associated stresses on posterior teeth

Cited by 20 publications

References 25 publications

Transcriptomic Classification of Neurons Innervating Teeth

Transcriptomic Classification of Neurons Innervating Teeth

Comparison of retention and fracture load of endocrowns made from zirconia and zirconium lithium silicate after aging: an in vitro study

Comparison of Retention and Fracture Load of Endocrowns Made from Zirconia and Zirconium Lithium Silicate After Aging: An in-Vitro Study

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