TODENTJ-25-03-2019_TODENTJ-12-255 1553507330 Bentham Open doi@benthamopen.net Bentham Open The Open Dentistry Journal TODENTJ 1874-2106 03 30 2018 12 1 Yuki Hashimoto Kyoko Sugimoto Yuki Tanaka Hikaru Sugimoto Shogo Minagi Background: Mastication has been regarded to play an important role in achieving quality daily life for the elderly. On the occlusal surface of posterior artificial teeth, parallel grooves of 1 mm depth and 1 mm width with an inter-groove distance of 2 mm have been found to significantly improve masticatory efficiency on a mechanical simulator. Materials and Methods: In the present study, the effect of the grooved design on masticatory efficiency in edentulous subjects using a short-term crossover trial was evaluated. Six edentulous participants, 1 male and 5 females, were assigned into two groups. One received duplicated complete dentures with grooved molars first, and the other received duplicated complete dentures with conventional molars first. The design of the teeth was crossover after evaluating masticatory efficiency. Raw carrot, raw lettuce and mixed foodstuffs were used to evaluate masticatory efficiency. Subjects were instructed to masticate 20 strokes and arbitrary strokes until they felt like swallowing. Results: The number of masticatory strokes taken was significantly smaller using the grooved design (p<.05). Masticatory efficiency analysis revealed that the grooved design achieved significantly higher masticatory efficiency at 20 masticatory strokes for raw carrot and mixed foodstuffs (p<.05). Conclusion: Results show that compared with conventional lingualized occlusion, the grooved design accomplishes higher masticatory efficiency in vivo. Considering the distinction of this design that it can be applied to any existing denture occlusion, the design might help improve the dietary life of the elderly. 03 30 2018 255 264 TODENTJ-12-255 1 10.2174/crossmark_policy opendentistryjournal.com benthamopen.com true Peer Reviewed Single blind Checked with iThenticate 2017-9-22 2018-02-15 2018-3-14 2018-03-30 https://creativecommons.org/licenses/by/4.0/legalcode 10.2174/1874210601812010255 1553507330 https://opendentistryjournal.com/VOLUME/12/PAGE/255/ https://opendentistryjournal.com/contents/volumes/V12/TODENTJ-12-255/TODENTJ-12-255.pdf https://opendentistryjournal.com/contents/volumes/V12/TODENTJ-12-255/TODENTJ-12-255.pdf https://opendentistryjournal.com/contents/volumes/V12/TODENTJ-12-255/TODENTJ-12-255.pdf https://opendentistryjournal.com/contents/volumes/V12/TODENTJ-12-255/TODENTJ-12-255.pdf https://opendentistryjournal.com/contents/volumes/V12/TODENTJ-12-255/TODENTJ-12-255.pdf https://opendentistryjournal.com/contents/volumes/V12/TODENTJ-12-255/TODENTJ-12-255.pdf https://opendentistryjournal.com/contents/volumes/V12/TODENTJ-12-255/TODENTJ-12-255.pdf https://opendentistryjournal.com/contents/volumes/V12/TODENTJ-12-255/TODENTJ-12-255.xml Int. J. Prosthodont. Ribeiro J.A. 25 625 2012 Ribeiro JA, de Resende CM, Lopes AL, et al. Evaluation of complete denture quality and masticatory efficiency in denture wearers. Int J Prosthodont 2012; 25 (6) : 625-30. Arch. Oral Biol. Ikebe K. 56 991 2011 10.1016/j.archoralbio.2011.03.019 Ikebe K, Matsuda K, Kagawa R, et al. Association of masticatory performance with age, gender, number of teeth, occlusal force and salivary flow in Japanese older adults: Is ageing a risk factor for masticatory dysfunction? Arch Oral Biol 2011; 56 (10) : 991-6. J. Oral Rehabil. Geertman M.E. 26 7 1999 10.1046/j.1365-2842.1999.00353.x Geertman ME, Slagter AP, van ’t Hof MA, van Waas MA, Kalk W. Masticatory performance and chewing experience with implant-retained mandibular overdentures. J Oral Rehabil 1999; 26 (1) : 7-13. Gerontology Goiato M.C. 54 138 2008 10.1159/000118099 Goiato MC, Garcia AR, dos Santos DM. Electromyographic activity of the mandible muscles at the beginning and end of masticatory cycles in patients with complete dentures. Gerontology 2008; 54 (3) : 138-43. Gerodontology Cousson P.Y. 29 e685 2012 10.1111/j.1741-2358.2011.00545.x Cousson PY, Bessadet M, Nicolas E, Veyrune JL, Lesourd B, Lassauzay C. Nutritional status, dietary intake and oral quality of life in elderly complete denture wearers. Gerodontology 2012; 29 (2) : e685-92. J. Oral Rehabil. Yoshida K. 15 373 1988 10.1111/j.1365-2842.1988.tb00171.x Yoshida K, Okane H, Nagasawa T, Tsuru H. A criterion for the selection of artificial posterior teeth. J Oral Rehabil 1988; 15 (4) : 373-8. Ann Jpn Prosthodont Soc Yako S. 3 258 2011 10.2186/ajps.3.258 Yako S, Koide K, Sato T, Kawamura M. Influence of the base form of bladed teeth for lingualized occlusion on crushing food. Ann Jpn Prosthodont Soc 2011; 3 : 258-67. J. Prosthodont. Res. Shiga H. 56 125 2012 10.1016/j.jpor.2011.06.001 Shiga H, Kobayashi Y, Arakawa I, Yokoyama M, Nakajima K. Influence of two masticating conditions on assessment of movement path stability. J Prosthodont Res 2012; 56 (2) : 125-9. J. Prosthodont. Res. Tamura K. 58 237 2014 10.1016/j.jpor.2014.06.001 Tamura K, Shiga H. Gender differences in masticatory movement path and rhythm in dentate adults. J Prosthodont Res 2014; 58 (4) : 237-42. J. Prosthodont. Res. Hashimoto Y. 61 193 2017 10.1016/j.jpor.2016.05.004 Hashimoto Y, Sugimoto K, Tanaka Y, Oki K, Minagi S. A new occlusal surface design for artificial posterior teeth to achieve high masticatory performance. J Prosthodont Res 2017; 61 (2) : 193-201. Haynes RB, Sackett DL, Guyatt GH, Tugwell P. Clinical Epidemiology: How to Do Clinical Practice Research 3rd ed. 2016; 123-4. J. Oral Rehabil. Sugimoto K. 41 184 2014 10.1111/joor.12133 Sugimoto K, Hashimoto Y, Fukuike C, Kodama N, Minagi S. Image analysis of food particles can discriminate deficient mastication of mixed foodstuffs simulating daily meal. J Oral Rehabil 2014; 41 (3) : 184-90. J. Oral Rehabil. Sugimoto K. 39 405 2012 10.1111/j.1365-2842.2012.02288.x Sugimoto K, Iegami CM, Iida S, Naito M, Tamaki R, Minagi S. New image analysis of large food particles can discriminate experimentally suppressed mastication. J Oral Rehabil 2012; 39 (6) : 405-10. J. Dent. Res. Nowjack-Raymer R.E. 86 1171 2007 10.1177/154405910708601206 Nowjack-Raymer RE, Sheiham A. Numbers of natural teeth, diet, and nutritional status in US adults. J Dent Res 2007; 86 (12) : 1171-5. Community Dent. Oral Epidemiol. Hung H.C. 33 167 2005 10.1111/j.1600-0528.2005.00200.x Hung HC, Colditz G, Joshipura KJ. The association between tooth loss and the self-reported intake of selected CVD-related nutrients and foods among US women. Community Dent Oral Epidemiol 2005; 33 (3) : 167-73. J. Prosthet. Dent. Levin B. 38 3 1977 10.1016/0022-3913(77)90260-8 Levin B. A review of artificial posterior tooth forms including a preliminary report on a new posterior tooth. J Prosthet Dent 1977; 38 (1) : 3-15. Indiana Family & Social Services Administration. Fact Sheet. Health & Safety: Aspiration Prevention Available at: http://www.in.gov/fssa/files/aspiration_prevention_1.pdf accessed 15 January 2017. J Home Economics Japan Toda S. 59 969 2008 Toda S, Takamatsu M, Kasai M, Hatae K. Effect of occlusal condition on the mastication of raw and cooked vegetables by the elderly. J Home Economics Japan 2008; 59 : 969-78. Arch. Oral Biol. Prinz J.F. 40 401 1995 10.1016/0003-9969(94)00185-E Prinz JF, Lucas PW. Swallow thresholds in human mastication. Arch Oral Biol 1995; 40 (5) : 401-3. Kokubyo Gakkai Zasshi Morizawa M. 53 255 1986 10.5357/koubyou.53.255 Morizawa M. Occlusal contact of complete dentures during mastication. Kokubyo Gakkai Zasshi 1986; 53 (1) : 255-80.