Numerical investigation of effects of incisor angle on production of sibilant /s/

Lu, HsuehJui; Yoshinaga, Takao; Li, Chung-Gang; Nozaki, Kazunori; Iida, Akiyoshi; Tsubokura, Makoto

doi:10.1038/s41598-021-96173-2

Cited by 9 publications

(7 citation statements)

References 30 publications

(40 reference statements)

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“…Studies demonstrated /s/ is the most frequently distorted when malocclusions or insertion of a prosthodontic restoration in the anterior region of the arch [21][22][23][24]. It also has been con rmed the central incisor position and inclination angle affect the production of the fricative consonant /s/ [11][12][13]. However, the impact of xed restoration on the changes of fricative acoustic features and speech movement behavior was not well illustrated [25].…”

Section: Discussionmentioning

confidence: 99%

“…Incisor overlap is a fundamental feature of anterior prosthetic restorations and cannot be simply complemented by aesthetics and occlusion standards as they are mostly achieved. It has been found that incisor overlap had a direct in uence on pronunciation [11][12][13], especially producing consonants like /s/ sound via obstructing and modifying the air ow. Therefore, it is necessary to clarify the relationship between overlaps of anterior restoration and pronunciation.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of /s/ sound acoustic characteristics and mandibular speech movements in aesthetic restoration: a case series evaluation

Liu

et al. 2023

Preprint

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Objectives Although great attention has been paid to improve aesthetic and biological function in restorative dentistry, the pronunciation issues after anterior restoration still trouble patients. The aims were to evaluate the effect of different incisor overlaps on the /s/ acoustic characteristics and mandibular speech movement trajectory of patients for anterior aesthetic restoration. Materials and Methods Eight patients who required bilateral upper incisors restoration were selected without any other oral diseases or malocclusion. Five prostheses with different overlaps (P0: prosthesis with original overlap; P1, P2, P3: prosthesis with overjet of 1mm, 2mm, 3mm, respectively; Pf: final prosthesis with overlap by considering the normal aesthetic and functional restoration principles) were made for each patient. Then /s/ sound acoustic characteristics and mandibular speech movement trajectory were tested. Results The overlap for each patient changed after restoration (Pf) compared with the original value (P0). Patients’ acoustic features of /s/ sound and mandibular speech movement altered with overlaps change. Only noise peak and maximum closing speed both before and after restoration (P0-Pf) were statistically different and lower than that of individual normal occlusion (INO) (P < 0.05). A certain variational trend was found between overlaps and acoustic features of /s/ sound and mandibular speech movement. Conclusions Aesthetic anterior restoration may result in overlap changes, which may disturb normal acoustic characteristics of /s/ sound and mandibular speech movement. Clinical Relevance: Only with the harmonious preconditions as occlusion, aesthetics and pronunciation, can we achieve the goal of integrating aesthetics and function in restorative dentistry. Clinical Relevance: Only with the harmonious preconditions as occlusion, aesthetics and pronunciation, can we achieve the goal of integrating aesthetics and function in restorative dentistry.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Analysis of /s/ sound acoustic characteristics and mandibular speech movements in aesthetic restoration: a case series evaluation

Liu

et al. 2023

Preprint

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“…However, SLTS method is not suitable for aeroacoustic simulations even when the convergence criteria are satisfied because of the Newton linearization error of the term . Hence, adaptively switched time stepping scheme (ASTS) 24 , 25 was applied to maintain the accuracy in the aeroacoustic simulation at the same time reducing the computational cost.…”

Section: Methodsmentioning

confidence: 99%

Numerical investigation of effects of tongue articulation and velopharyngeal closure on the production of sibilant [s]

Yoshinaga

et al. 2022

Sci Rep

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A numerical simulation of sibilant /s/ production with the realistically moving vocal tract was conducted to investigate the flow and acoustic characteristics during the articulation process of velopharyngeal closure and tongue movement. The articulation process was simulated from the end of /u/ to the middle of /s/ in the Japanese word /usui/, including the tongue elevation and the velopharyngeal valve closure. The time-dependent vocal tract geometry was reconstructed from the computed tomography scan. The moving immersed boundary method with the hierarchical structure grid was adopted to approach the complex geometry of the human speech organs. The acoustic characteristics during the co-articulation process were observed and consistent with the acoustic measurement for the subject of the scan. The further simulations with the different closing speeds of the velopharyngeal closure showed that the far-field sound during the co-articulation process was amplified with the slower closing case, and the velum closure speed was inverse proportional to the sound amplitude with the slope value of − 35.3 dB s/m. This indicates possible phonation of indistinguishable aeroacoustics sound between /u/ and /s/ with slower velopharyngeal closure.

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“…This simple improvement yields critical benefits that will not cause errors in any types of geometry data, and is applicable to Cartesian grids. We have applied the variations of these methods to various industrial problems ( Bale et al, 2020 ; Cao et al, 2019 ; Jansson et al, 2019 ; Li et al, 2016 ; Lu et al, 2021 ; Onishi et al, 2018 ). For COVID-19 digital twins of societal situations, the optimal method was selected for one making it possible to automatically and robustly simulate complex dirty geometry, reducing the time required for preprocessing to about 10 min or less.…”

Section: Innovations Realizedmentioning

confidence: 99%

Digital transformation of droplet/aerosol infection risk assessment realized on “Fugaku” for the fight against COVID-19

Ando

Bale

et al. 2022

The International Journal of High Performance Computing Applica

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The fastest supercomputer in 2020, Fugaku, has not only achieved digital transformation of epidemiology in allowing end-to-end, detailed quantitative modeling of COVID-19 transmissions for the first time but also transformed the behavior of the entire Japanese public through its detailed analysis of transmission risks in multitudes of societal situations entailing heavy risks. A novel aerosol simulation methodology was synthesized out of a combination of a new CFD methods meeting industrial demands in the solver, CUBE (Jansson et al., 2019), which not only allowed the simulations to scale massively with high resolution required for micrometer virus-containing aerosol particles but also enabled extremely rapid time-to-solution due to its ability to generate the digital twins representing multitudes of societal situations in a matter of minutes, attaining true overall application high performance; such simulations have been running for the past 1.5°years on Fugaku, cumulatively consuming top supercomputer-class resources and the communicated by the media as well as becoming the basis for official public policies.

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Numerical investigation of effects of incisor angle on production of sibilant /s/

Cited by 9 publications

References 30 publications

Analysis of /s/ sound acoustic characteristics and mandibular speech movements in aesthetic restoration: a case series evaluation

Analysis of /s/ sound acoustic characteristics and mandibular speech movements in aesthetic restoration: a case series evaluation

Numerical investigation of effects of tongue articulation and velopharyngeal closure on the production of sibilant [s]

Digital transformation of droplet/aerosol infection risk assessment realized on “Fugaku” for the fight against COVID-19

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