Evaluation of Occlusal Status of Japanese Adults Based on Functional Tooth Units

Overview

Journal Int Dent J

Publisher Elsevier

Specialty Dentistry

Date 2021 May 9

PMID 33965238

Citations 4

Authors

Takashi Zaitsu

Mari Ohnuki

Yuichi Ando

Yoko Kawaguchi

Affiliations

Soon will be listed here.

Abstract

Objectives: Although extensive national oral health data on dental caries and periodontal diseases in Japan are available, few studies have assessed the occlusal status of the Japanese population, and none are based on national survey data. The presence and prosthodontic conditions of the molar region are important for masticatory function, and the functional tooth unit (FTU) approach can be used to evaluate the occlusal status. Thus, using the national oral health survey data, this study investigated the occlusal status of the Japanese population using FTU.

Methods: Overall, 3,605 adults (aged ≥20 years) who participated in the 2011 Japanese national oral health survey were included. FTUs were used as indices for evaluating the occlusal status. FTUs were calculated according to sex, age group, and the number of teeth present, and their associations were further analysed.

Results: The number of teeth present, posterior teeth, and FTUs decreased with age in both men and women. In the age group of those ≥60 years, all only natural teeth-FTU (n-FTU) and natural teeth and artificial teeth from fixed prostheses or implant-supported FTU (nif-FTU) scores were <8. The total-FTU scores of all age groups, except the 60-69 and 70-79 years age groups, were >10.

Conclusion: This is the first study to use FTUs and national oral health survey data to investigate the occlusal status in the Japanese population. People aged ≥60 years who have low n-FTU or natural teeth and artificial teeth from fixed prostheses or implant-supported FTU scores or those aged 60-70 years who have the lowest total-FTU scores require careful evaluation of masticatory performance.

Citing Articles

Lee D, Kim H, Choi J Healthcare (Basel). 2024; 12(2).

PMID: 38275546 PMC: 10815140. DOI: 10.3390/healthcare12020267.

Association Between Reduced Posterior Occlusal Contact and Alzheimer's Disease Onset in Older Japanese Adults: Results from the LIFE Study.

Miyano T, Ayukawa Y, Anada T, Takahashi I, Furuhashi H, Tokunaga S J Alzheimers Dis. 2023; 97(2):871-881.

PMID: 38160352 PMC: 10894584. DOI: 10.3233/JAD-230449.

Oral frailty is a risk factor for body weight loss after gastrectomy: a single-center, retrospective study.

Teranishi R, Yamamoto K, Kurokawa Y, Uchihashi T, Sugauchi A, Tanikawa C Int J Clin Oncol. 2023; 28(12):1625-1632.

PMID: 37875767 DOI: 10.1007/s10147-023-02413-y.

The Impact of Masticatory Function on Cognitive Impairment in Older Patients: A Population-Based Matched Case-Control Study.

Ko K, Park J, Lee J, Ye B, Jung U, Choi S Yonsei Med J. 2022; 63(8):783-789.

PMID: 35914761 PMC: 9344271. DOI: 10.3349/ymj.2022.63.8.783.

References

Akaho E, Coffin G, Kusano T, Locke L, Okamoto T . A proposed optimal health care system based on a comparative study conducted between Canada and Japan. Can J Public Health. 1998; 89(5):301-7. PMC: 6990325. View

Charyeva O, Altynbekov K, Nysanova B . Kennedy classification and treatment options: a study of partially edentulous patients being treated in a specialized prosthetic clinic. J Prosthodont. 2012; 21(3):177-80. DOI: 10.1111/j.1532-849X.2011.00809.x. View

Iwasaki T, Fukuda H, Kitamura M, Kawashita Y, Hayashida H, Furugen R . Association between number of pairs of opposing posterior teeth, metabolic syndrome, and obesity. Odontology. 2018; 107(1):111-117. DOI: 10.1007/s10266-018-0386-x. View

Ikebe K, Matsuda K, Murai S, Maeda Y, Nokubi T . Validation of the Eichner index in relation to occlusal force and masticatory performance. Int J Prosthodont. 2011; 23(6):521-4. View

Hongal S, Torwane N, Chandrashekhar B, Saxena V, Chavan K . An evaluation of dental prosthetic status and prosthetic needs among eunuchs (trans genders) residing in bhopal city, madhya pradesh, India: a cross-sectional study. Ann Med Health Sci Res. 2014; 4(6):943-8. PMC: 4250996. DOI: 10.4103/2141-9248.144921. View

Zaitsu T, Saito T, Kawaguchi Y . The Oral Healthcare System in Japan. Healthcare (Basel). 2018; 6(3). PMC: 6163272. DOI: 10.3390/healthcare6030079. View

Samnieng P, Ueno M, Shinada K, Zaitsu T, Wright F, Kawaguchi Y . Oral health status and chewing ability is related to mini-nutritional assessment results in an older adult population in Thailand. J Nutr Gerontol Geriatr. 2011; 30(3):291-304. DOI: 10.1080/21551197.2011.591271. View

Ueno M, Yanagisawa T, Shinada K, OHara S, Kawaguchi Y . Masticatory ability and functional tooth units in Japanese adults. J Oral Rehabil. 2008; 35(5):337-44. DOI: 10.1111/j.1365-2842.2008.01847.x. View

Ikeda N, Takimoto H, Imai S, Miyachi M, Nishi N . Data Resource Profile: The Japan National Health and Nutrition Survey (NHNS). Int J Epidemiol. 2015; 44(6):1842-9. DOI: 10.1093/ije/dyv152. View

10.

Aida J, Ando Y, Akhter R, Aoyama H, Masui M, Morita M . Reasons for permanent tooth extractions in Japan. J Epidemiol. 2006; 16(5):214-9. PMC: 7683702. DOI: 10.2188/jea.16.214. View

11.

Ben-Ur Z, Shifman A, Aviv I, Gorfil C . Further aspects of design for distal extension removable partial dentures based on the Kennedy classification. J Oral Rehabil. 1999; 26(2):165-9. DOI: 10.1046/j.1365-2842.1999.00344.x. View

12.

Lantto A, Lundqvist R, Wardh I . Tooth Loss and Prosthetic Treatment in Dependent and Functionally Impaired Individuals with Respect to Age and Gender. Int J Prosthodont. 2016; 29(1):68-70. DOI: 10.11607/ijp.4339. View

13.

Kovaeevic Pavicic D, Delic Z, Lajnert V, Fugosic V, Simonic Kocijan S, Bukovic D . Changes of alveolar bone density around the abutment teeth in patients wearing removable partial dentures depending on Kennedy classification. Coll Antropol. 2010; 33(4):1349-52. View

14.

Hanioka T, Ojima M, Tanaka K, Aoyama H . Relationship between smoking status and tooth loss: findings from national databases in Japan. J Epidemiol. 2007; 17(4):125-32. PMC: 7058469. DOI: 10.2188/jea.17.125. View

15.

Kida I, Astrom A, Strand G, Masalu J . Chewing problems and dissatisfaction with chewing ability: a survey of older Tanzanians. Eur J Oral Sci. 2007; 115(4):265-74. DOI: 10.1111/j.1600-0722.2007.00459.x. View

16.

Hull P, Worthington H, Clerehugh V, Tsirba R, Davies R, Clarkson J . The reasons for tooth extractions in adults and their validation. J Dent. 1997; 25(3-4):233-7. DOI: 10.1016/s0300-5712(96)00029-2. View

17.

Yoshino K, Kikukawa I, Yoda Y, Watanabe H, Fukai K, Sugihara N . Relationship between Eichner Index and number of present teeth. Bull Tokyo Dent Coll. 2012; 53(1):37-40. DOI: 10.2209/tdcpublication.53.37. View

18.

Hamasaki T, Kitamura M, Kawashita Y, Ando Y, Saito T . Periodontal disease and percentage of calories from fat using national data. J Periodontal Res. 2016; 52(1):114-121. DOI: 10.1111/jre.12375. View

19.

Adiatman M, Ueno M, Ohnuki M, Hakuta C, Shinada K, Kawaguchi Y . Functional tooth units and nutritional status of older people in care homes in Indonesia. Gerodontology. 2012; 30(4):262-9. DOI: 10.1111/j.1741-2358.2012.00673.x. View

20.

Ueno M, Yanagisawa T, Shinada K, Ohara S, Kawaguchi Y . Category of functional tooth units in relation to the number of teeth and masticatory ability in Japanese adults. Clin Oral Investig. 2009; 14(1):113-9. DOI: 10.1007/s00784-009-0270-8. View