+ Site Statistics
+ Search Articles
+ PDF Full Text Service
How our service works
Request PDF Full Text
+ Follow Us
Follow on Facebook
Follow on Twitter
Follow on LinkedIn
+ Subscribe to Site Feeds
Most Shared
PDF Full Text
+ Translate
+ Recently Requested

A three-dimensional evaluation of the effects of functional occlusal forces on the morphology of dental and periodontal tissues of the rat incisor



A three-dimensional evaluation of the effects of functional occlusal forces on the morphology of dental and periodontal tissues of the rat incisor



Journal of Dental Research 68(8): 1269-1274



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. 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.

Please choose payment method:






(PDF emailed within 0-6 h: $19.90)

Accession: 039130939

Download citation: RISBibTeXText

PMID: 2632615

DOI: 10.1177/00220345890680081101


Related references

Effect of occlusal functional forces on incisor socket morphology and location in the rat mandible. Anatomical Record 226(3): 367-372, 1990

Relationship of vitamin E to changes in dental and periodontal tissues of the rat incisor. Jour Dental Res 24(3/4): 197, 1945

Effect of repeated orthodontic treatment on the dental and periodontal tissues of the rat incisor. American Journal of Orthodontics and Dentofacial Orthopedics 116(6): 642-650, 1999

Structural changes in the dental and periodontal tissues of the rat incisor following application of orthodontic loads. American Journal of Orthodontics and Dentofacial Orthopedics 91(1): 49-56, 1987

Orthodontic vs. restorative treatment of the congenitally absent lateral incisor--long term periodontal and occlusal evaluation. Journal of Periodontology 46(3): 139-143, 1975

Functional morphology of the periodontal ligament in the incisor region of the sheep. Research in Veterinary Science 25(2): 144-151, 1978

Recovery of the dental and periodontal tissues of the rat incisor following application of continuous intrusive loads: a long-term study. American Journal of Orthodontics 87(2): 135-143, 1985

Occlusal examination in the diagnosis and treatment of periodontal disease. 2. Examination of signs and symptoms in dental structures. Periodontal, radiographic and clinical evaluation of occlusion. Revista Europea de Odonto-Estomatologia 2(2): 111-116, 1990

The effect of combined occlusal and mechanical forces on the pdl of rat incisor. Journal of Dental Research 69(SPEC ISSUE MAR): 283, 1990

Evaluation of periodontal probing forces used by dental clinicians. Journal of Dental Research 61(SPEC ISSUE): 200, 1982

The effects of local trauma to the enamel-related periodontal tissues in the eruption of the rat incisor. Archives of Oral Biology 45(4): 323-333, 2000

Long-term effects of orthodontic forces on the morphology of the rat-incisor socket and its location in the mandible. Journal of Dental Research 69(12): 1834-1838, 1990

Effects of loss of occlusal contact on the expression of matrix metalloproteinase-2, membrane type 1-MMP, tissue inhibitor of the MMP-2, eruption rate, organization and resistance of collagen fibers of the rat incisor periodontal ligament. Journal of Periodontal Research 53(1): 40-46, 2017

Effect of bite force in occlusal adjustment of dental implants on the distribution of occlusal pressure: comparison among three bite forces in occlusal adjustment. International Journal of Implant Dentistry 1(1): 14, 2016

Distribution of occlusal forces during occlusal adjustment of dental implant prostheses: a nonlinear finite element analysis considering the capacity for displacement of opposing teeth and implants. International Journal of Oral and Maxillofacial Implants 27(2): 329-335, 2012