The periodontal enigma: eruption versus tooth support

European Journal of Orthodontics
D C Picton

Abstract

The response of the periodontal ligament is reviewed when single or repeated loads are applied to the tooth, as in mastication. A more nearly elastic recovery is produced with simulated chewing than is indicated by single semi-static applications of force. The resting position of the tooth between loadings changes with the time of day and recent loading history. An unstressed tooth extrudes at a variable rate. Soon after entry into the mouth, extrusion is a progressive feature, which manifests as eruption with consequent structural rearrangement of the periodontium. Rates of extrustion are substantially higher than eruption. Experimental evidence is presented that newly erupted teeth of monkey erupt in a similar manner to rodent incisors. Thus reduction in masticatory loads allows teeth to erupt faster than control teeth. It is concluded that the ligament is well constructed to withstand the large but short-acting forces which occur in mastication and which cause relatively small, long term effects, on the position of the tooth in the alveolus. When unstressed, mechanisms in the ligament of a tooth with a developing or fully formed root, generate a continuous net force in the order of a gram tending to cause extrusion. The posi...Continue Reading

Citations

Aug 18, 2010·Journal of Clinical Periodontology·Pascale Habre-HallageCécile B Grandin
Jun 9, 2010·Journal of Biomechanical Engineering·Marzio BergomiUrs C Belser
Apr 14, 2020·Journal of Periodontal Research·Mohammad NajafidoustIman Z Oskui
Jan 16, 2021·Scientific Reports·Tomomi NakamuraShinya Murakami
Jun 20, 2021·Computer Methods and Programs in Biomedicine·Jinlai ZhouChunqiu Zhang

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