Effects of tooth loading on the periodontal vasculature of the mandibular fourth premolar in dogs

Ng, G.C.; Walker, Thomas; Zingg, Walter; Burke, P.S.

doi:10.1016/0003-9969(81)90129-1

Cited by 18 publications

(4 citation statements)

References 8 publications

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“…Humans compensate for shifts in blood volume when moving between upright and supine postures by a coordination of the musculoskeletal, nervous, and circulatory systems (Smith and Kampine, 1980;Rowell and Blackmon, 1984). Further, vascular pressures can produce forces sufficient to move teeth under physiological conditions (Moxham, 1988); studies have demonstrated that teeth show pulsatile movements that are synchronous with the arterial pulse (Korber, 1970;Ng et al, 1981). It does not seem unreasonable to suggest that movement from an upright to a supine posture could increase either vascular pressure or pooling of blood in the periodontal ligament, which in turn could slightly extrude teeth out of their bony alveolar sockets.…”

Section: Discussionmentioning

confidence: 96%

Variation of Approximal Tooth Contact Tightness with Postural Change

Southard

Tolley

1990

J Dent Res

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In order to investigate the role played by posture in determining posterior dental contact tightness, we measured contact tightness of maxillary and mandibular posterior teeth in ten adult subjects, while each was initially seated upright, after each had assumed a supine posture for two h, and finally after each had returned to an upright posture for two h. The technique used for measurement of contact tightness was based on frictional force concepts and consisted of the recording of the force required to withdraw a 0.038-mm-thick stainless-steel strip that had been slipped into each contact. A decreased mean tightness of all maxillary and mandibular contacts followed the change from an upright to a supine posture. The most significant decrease (-32%) occurred at the mandibular first molar-second premolar contact, and the smallest decrease (-10%) occurred at the mandibular first premolar-canine contact. An increased mean tightness of all maxillary and mandibular contacts followed a return to an upright posture. The most significant increase (20%) occurred at the maxillary first molar-second premolar contact, and the smallest increase (8%) occurred at the maxillary first premolar-canine contact. We conclude that posterior dental contact tightness, generally regarded by dentists as a static feature of occlusion, varies significantly as a function of posture.

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Section: Discussionmentioning

confidence: 96%

Variation of Approximal Tooth Contact Tightness with Postural Change

Southard

Tolley

1990

J Dent Res

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“…Furthermore, the increased pressure of the blood vessels produces a force sufficiently large to move the teeth under the physiological state 27. Several studies have reported that teeth undergo pulsatile movements corresponding to the arterial pulse 28,29. Changing posture from an upright to a supine position can increase the level of blood congestion or blood pressure in the periodontal ligament.…”

Section: Discussionmentioning

confidence: 99%

Evaluation of proximal contact strength by postural changes

Kim

et al. 2009

J Adv Prosthodont

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STATEMENT OF PROBLEMProper proximal contact is important for maintaining and stabilizing the dental arch. However, the proximal contact strength (PCS) is not a constant value and can be affected by a variety of factors.PURPOSEThis study examined the influences of postural changes on the posterior PCS.MATERIAL AND METHODSTwelve adults with a normal occlusion and had not undergone prosthetic treatment or proximal restoration were participated in this study. A metal strip was inserted into the proximal surface and removed at a constant velocity. The contact strength was measured in every contact point between canine to second molar in both arches. The PCSs were obtained initially in the upright position, secondly in the supine position and finally in the upright position again. All measurements were repeated after a 2 hour period. Statistical analysis was carried out using the Friedman test (P < .05).RESULTSGenerally, a decrease in PCS occurred when the posture was changed from the initial upright to supine position, while it increased when the posture was changed from the supine to upright position. A significant change was observed in all areas except for between the canine-first premolar in the maxilla and between the first molarsecond molar in the mandible areas.CONCLUSIONThe posterior PCS, which dentists generally believe to be a static feature of occlusion, is affected significantly by posture.

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“…The blood vessels allow for pressure compensation through fluid displacement which, in turn, affects the biomechanical response to loads applied to the tooth Radlanski, 2011). Additionally, the systemic blood pressure in the vessels of the PDL results in a measurable pulsation of a tooth under loading (Imamura et al, 2002;Ng et al, 1981). Vessel distribution is affected by the applied loading regime.…”

Section: Introductionmentioning

confidence: 99%