{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,3]],"date-time":"2026-05-03T12:13:48Z","timestamp":1777810428878,"version":"3.51.4"},"reference-count":26,"publisher":"SAGE Publications","issue":"8","license":[{"start":{"date-parts":[[1989,8,1]],"date-time":"1989-08-01T00:00:00Z","timestamp":617932800000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/journals.sagepub.com\/page\/policies\/text-and-data-mining-license"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["J Dent Res"],"published-print":{"date-parts":[[1989,8]]},"abstract":"<jats:p>We examined the effect of function on tooth and periodontal ligament (PDL) morphology in 40 lower incisors of adult female rats. Ten teeth were exposed to occlusal hyperfunction for three months, ten to hypofunction for three weeks, ten to hypofunction for three months, while ten teeth in normal occlusion served as control. Transverse ground sections were cut at various levels perpendicular to the tooth long axis, and their distances from the apex were calculated. The outlines of the tissues were traced and fed into a computer. We plotted the measurements according to their location and fitted them by second-order polynomials. We calculated tissue volume for the proximal 18 mm of bone-embedded tooth.<\/jats:p>\n                  <jats:p>Hyperfunction affected tooth shape, in that it became more rounded. The volumes of the dental tissues remained unchanged, while width and volume of the cementum-bordering PDL increased. Hypofunction did not alter tooth shape, but influenced its size: After three weeks, tooth circumference decreased, and after three months, it expanded. Dentin width was reduced, with concomitant increase of pulp size. The amount of enamel diminished initially, but after three months returned to normal values. The PDL bordering enamel expanded proportionally to the duration of hypofunction. The changes in socket size reflected the total dimensional variations in the tooth and its PDL. The results demonstrate that the shape and size of growing teeth and their periodontium are influenced by functional occlusal forces.<\/jats:p>","DOI":"10.1177\/00220345890680081101","type":"journal-article","created":{"date-parts":[[2010,11,28]],"date-time":"2010-11-28T21:14:56Z","timestamp":1290978896000},"page":"1269-1274","source":"Crossref","is-referenced-by-count":38,"title":["A Three-dimensional Evaluation of the Effects of Functional Occlusal Forces on the Morphology of Dental and Periodontal Tissues of the Rat Incisor"],"prefix":"10.1177","volume":"68","author":[{"given":"S.","family":"Steigman","sequence":"first","affiliation":[{"name":"Department of Orthodontics, Hebrew University-Hadassah Dental and Medical Schools, P.O.B. 1172, Jerusalem 91010, Israel"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Y.","family":"Michaeli","sequence":"additional","affiliation":[{"name":"Department of Anatomy and Embryology, Hebrew University-Hadassah Dental and Medical Schools, P.O.B. 1172, Jerusalem 91010, Israel"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"M.","family":"Yitzhaki","sequence":"additional","affiliation":[{"name":"Department of Orthodontics, Hebrew University-Hadassah Dental and Medical Schools, P.O.B. 1172, Jerusalem 91010, Israel"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"M.","family":"Weinreb","sequence":"additional","affiliation":[{"name":"Hubert H. Humphrey Center of Experimental Medicine and Cancer Research, Hebrew University-Hadassah Dental and Medical Schools, P.O.B. 1172, Jerusalem 91010, Israel"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"179","published-online":{"date-parts":[[1989,8,1]]},"reference":[{"key":"atypb1","doi-asserted-by":"publisher","DOI":"10.1016\/0003-9969(72)90161-6"},{"key":"atypb2","doi-asserted-by":"publisher","DOI":"10.1093\/ejo\/6.3.205"},{"key":"atypb3","unstructured":"Carranza, F.A. (1979): Classification of Periodontal Disease. In: Glickman's Clinical Periodontology, Philadelphia: W.B. Saunders Co., pp. 194-208."},{"key":"atypb4","unstructured":"Goldman, H.M. and Cohen, D.W. (1980): Lesions of the Attachment Apparatus. In: Periodontal Therapy, 6th ed. St. Louis: C.V. Mosby Co., pp. 239-261."},{"key":"atypb5","doi-asserted-by":"publisher","DOI":"10.1111\/j.1600-0765.1983.tb00370.x"},{"key":"atypb6","unstructured":"Grant, D.A.; Stern, LB; and Everett, F.G. (1979): Role of Occlusion in Periodontal Disease. In: Periodontics, 5th ed. St. Louis : C.V. Mosby Co., pp. 400-427."},{"key":"atypb7","doi-asserted-by":"publisher","DOI":"10.1016\/0002-9416(86)90068-0"},{"key":"atypb8","doi-asserted-by":"publisher","DOI":"10.1093\/ejo\/7.4.273"},{"key":"atypb9","volume-title":"Abstr Proceedings 63rd Congress of the European Orthodontic Society","author":"Kjellberg, H."},{"key":"atypb10","doi-asserted-by":"publisher","DOI":"10.1016\/0002-9416(84)90143-X"},{"key":"atypb11","doi-asserted-by":"publisher","DOI":"10.1902\/jop.1972.43.5.311"},{"key":"atypb12","doi-asserted-by":"publisher","DOI":"10.1002\/ar.1092150409"},{"key":"atypb13","doi-asserted-by":"publisher","DOI":"10.1177\/00220345680470042101"},{"key":"atypb14","first-page":"73","volume":"14","author":"Michaeli, Y.","year":"1981","journal-title":"Cell Tissue Kinet"},{"key":"atypb15","doi-asserted-by":"publisher","DOI":"10.1016\/0002-9416(85)90023-5"},{"key":"atypb16","unstructured":"Michaeli, Y.; Steigman, S.; Weinreb, M., Jr.; and Zajicek, G. (1982): Histomorphomctric Study of the Impeded and Unimpeded Rat Incisor. In: Current Advances in Skeletogenesis, M. Silberman and H.C. Slavkin , Eds. Amsterdam: Excerpta Medica , pp. 276-283."},{"key":"atypb17","doi-asserted-by":"publisher","DOI":"10.1177\/00220345740530052401"},{"key":"atypb18","doi-asserted-by":"publisher","DOI":"10.1007\/BF00209242"},{"key":"atypb19","doi-asserted-by":"publisher","DOI":"10.1016\/0002-9416(75)90138-4"},{"key":"atypb20","unstructured":"Picton, D.C.A. (1969): The Effect of External Forces on the Periodontium . In: Biology of the Periodontium, A.H. Melchcr and W.H. Bowen, Eds. London: Academic Press, Inc., pp. 378-381."},{"key":"atypb21","doi-asserted-by":"publisher","DOI":"10.1111\/j.1600-0765.1976.tb00057.x"},{"key":"atypb22","doi-asserted-by":"publisher","DOI":"10.1016\/0889-5406(87)90208-3"},{"key":"atypb23","doi-asserted-by":"publisher","DOI":"10.1002\/ar.1092050410"},{"key":"atypb24","doi-asserted-by":"publisher","DOI":"10.1016\/0002-9416(84)90144-1"},{"key":"atypb25","doi-asserted-by":"publisher","DOI":"10.1016\/0003-9969(84)90088-8"},{"key":"atypb26","doi-asserted-by":"publisher","DOI":"10.1002\/ar.1092110215"}],"container-title":["Journal of Dental Research"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/journals.sagepub.com\/doi\/pdf\/10.1177\/00220345890680081101","content-type":"application\/pdf","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/journals.sagepub.com\/doi\/pdf\/10.1177\/00220345890680081101","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2026,4,29]],"date-time":"2026-04-29T21:00:00Z","timestamp":1777496400000},"score":1,"resource":{"primary":{"URL":"https:\/\/journals.sagepub.com\/doi\/10.1177\/00220345890680081101"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[1989,8]]},"references-count":26,"journal-issue":{"issue":"8","published-print":{"date-parts":[[1989,8]]}},"alternative-id":["10.1177\/00220345890680081101"],"URL":"https:\/\/doi.org\/10.1177\/00220345890680081101","relation":{},"ISSN":["0022-0345","1544-0591"],"issn-type":[{"value":"0022-0345","type":"print"},{"value":"1544-0591","type":"electronic"}],"subject":[],"published":{"date-parts":[[1989,8]]}}}