The relationship between lip-closing strength and the related factors in a cross-sectional study

Saitoh, Issei; Inada, Emi; Kaihara, Yasutaka; Nogami, Yukiko; Murakami, Daisuke; Ishitani, Norihito; Sawami, Tadashi; Iwase, Yoko; Nakajima, Takashi; Kubota, Naoko; Sakurai, Kazuo; Tsujii, Toshiya; Shirazawa, Yoshito; Hanasaki, Mika; Kurosawa, Mie; Goto, Miyuki; Nosou, Maki; Kozai, Katsuyuki; Yamasaki, Yuichi; Hayasaki, Haruaki

doi:10.1016/j.pdj.2017.06.002

Cited by 19 publications

(24 citation statements)

References 19 publications

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“…The acquisition of a daily habit to close the lips is particularly important in children. Lip-closing strength related to closed lips increased with age in children, but children with ILS tended to have weak lip-closing strength [ 11 , 32 ]. Owing to ILS immobilization without spontaneous improvement, the prevalence of ILS may increase with age.…”

Section: Discussionmentioning

confidence: 99%

Prevalence of an incompetent lip seal during growth periods throughout Japan: a large-scale, survey-based, cross-sectional study

Nogami

Saitoh

Inada

et al. 2021

Environ Health Prev Med

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Background Systemic and local factors may lead to disruption of craniofacial growth and development, causing an imbalance between the orofacial skeleton, muscle and soft tissue, dental occlusion, and the dental arch during growth periods. We aimed to reveal whether the prevalence of incompetent lip seal (ILS) varies with age and region, as well as to clarify the factors related to an ILS, in a national, large-scale epidemiological study. Methods We surveyed 3399 children, from 3 to 12 years of age, visiting 66 pediatric dental clinics throughout Japan. For this survey, we employed a questionnaire consisting of 44 questions regarding daily health conditions and lifestyle habits. We evaluated the differences in ILS prevalence by age and region (using a Cochran-Armitage test for trend and a Kruskal-Wallis test), and the relationship between ILS and factors investigated in the questionnaire (using Spearman’s rank correlation coefficient). Results We observed that 30.7% of Japanese children exhibited an ILS and that the ILS rate increased with age (p < 0.001). There were no regional differences in the rate of ILS in Japanese children (p = 0.506). We revealed that 12 of 44 survey items exhibited a statistically significant correlation with ILS (p < 0.001), using Spearman’s rank correlation coefficient. These items involved orofacial morphology, mouth breathing, and possibly, allergic rhinitis. Conclusion The rate of ILS seems to increase with age in children, throughout Japan. Therefore, this disorder may not self-correct during the growth periods in these children. Guidelines are required for pediatric dentists to recognize ILS among children aged 3–12 years.

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Section: Discussionmentioning

confidence: 99%

Prevalence of an incompetent lip seal during growth periods throughout Japan: a large-scale, survey-based, cross-sectional study

Nogami

Saitoh

Inada

et al. 2021

Environ Health Prev Med

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“…Lip-seal strength was measured with a digital medical strain gauge (Lipplekun; Shofu, Kyoto, Japan), in accordance with a method reported previously ( Fig. 1) 11) . The Lipple button (Shofu) for measurement ( Fig.…”

Section: Methodsmentioning

confidence: 99%

“…A probetype tongue pressure gauge 4,16) or pressure sensor sheet 5,9) are commonly used to measure tongue pressure in determining muscle strength. The muscle strength of the lips has been called lip-seal 1) , lip-strength 13) , vertical labial pressure 15) , lip-closing strength 11) , lipforce 3,12) , lip-closing force 6) , maximum voluntary lip-closing force 7) , and maximum restraining lip-force 14) ; and various methods have been developed for its evaluation.…”

Section: Introductionmentioning

confidence: 99%

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Intra- and Inter-Investigator Reliability of Measurement of Lip-Seal Strength in Adults

Ueda

Oki

Ohta

et al. 2019

Bull. Tokyo Dent. Coll.

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The purpose of this methodological study was to clarify intra-and inter-investigator reliability of lip-seal strength measurement in adults. Lip-seal strength was measured with a digital medical strain gauge using the button-pull method. The coefficient of variation (CV) of intra-investigator reliability of measurement in 24 healthy adult volunteers (16 men, 8 women; mean age, 26±3 years) ranged from 0.088 to 0.103 (mean for 3 investigators, 0.098). The intraclass correlation coefficient (ICC [1,1]) of intra-investigator reliability of this method of lip-seal strength measurement ranged from 0.759 to 0.832 (mean, 0.804). The ICC (2,1) of inter-investigator reliability of the measured values was 0.737. The CV of intra-investigator reliability of lip-seal strength measurement by a single investigator in 54 adult patients (14 men, 40 women; mean age, 49±16 years) was 0.072. The ICC (1,1) of intra-investigator reliability of this measurement method of lip-seal strength was 0.863. A CV of approximately 0.2 or lower is considered to indicate excellent agreement; an ICC of approximately 0.75 or higher is considered indicative of good reliability. These results demonstrate that measurement of lip-seal strength in adults with this device offers sufficient intra-and inter-investigator reliability.

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“…As the gauge was pulled parallel to the floor, it recorded the highest tension before the button was pulled from the mouth (Saitoh et al, 2017).…”

Section: Lip-closing Strengthmentioning

confidence: 99%

Relationship between oral function and mandibular anterior crowding in early mixed dentition

Ohno

Fujita

Ohno

et al. 2020

Clinical & Exp Dental Res

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The position of the dentition is considered to be determined by a combination of forces exerted by the perioral muscles and tongue. We hypothesized that mandibular anterior crowding may be related to abnormalities in the development of oral function. To determine the relationship between oral function and mandibular anterior crowding in early mixed dentition. A total of 61 children (30 boys, 31 girls) with early mixed dentition were included in this study. Height, body weight, maximum occlusal force, lip-closing strength, and maximum tongue pressure were measured in all participants, and their dental casts and lateral cephalograms were evaluated. Little's irregularity index (LII), evaluated by dental casts, was used as an indicator of mandibular anterior crowding. Maximum occlusal force and lip-closing strength were not significantly correlated with the LII, although they were positively correlated with maximum tongue pressure, mandibular intercanine perimeter distance, and upper central incisor (U1)-to-NL angle (p < .05). Maximum tongue pressure was negatively correlated with LII (p < .05). Maximum tongue pressure and LII were significantly positively correlated with the mandibular intercanine perimeter distance and U1/NL angle, and negatively correlated with the interincisal angle (p < .05 for all). Crowding of the mandibular anterior teeth was directly correlated with tongue pressure function and indirectly correlated with maximum occlusal force and lip-closing strength.

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The relationship between lip-closing strength and the related factors in a cross-sectional study

Cited by 19 publications

References 19 publications

Prevalence of an incompetent lip seal during growth periods throughout Japan: a large-scale, survey-based, cross-sectional study

Prevalence of an incompetent lip seal during growth periods throughout Japan: a large-scale, survey-based, cross-sectional study

Intra- and Inter-Investigator Reliability of Measurement of Lip-Seal Strength in Adults

Relationship between oral function and mandibular anterior crowding in early mixed dentition

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