Dynamics of Repair in the Pulp

Luostarinen, V.; Pohto, M; Scheinin, Arje

doi:10.1177/00220345660450031301

Cited by 11 publications

(5 citation statements)

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“…With all classes of trauma,, a resorbed area was most frequently identified coronally or in the middle third of the root. This should not be an unexpected result as it has been shown that necrosis may progress from the coronal to the apical part of the pulp (10). Thus, the pulp may remain vital apically for a while.…”

Section: Discussionmentioning

confidence: 68%

Criteria for diagnosis of pulp necrosis in traumatized permanent incisors

Jacobsen

1980

European J Oral Sciences

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– Records and radiographs of 108 patients (6–18 years) with 134 root canal treated incisors were examined. Subluxation was the most common type of injury, followed by intrusive, extrusive or lingual luxation, exarticiulation and uncomplicated crown fracture. Negative response to electric stimulation was noted in 107 teeth from the first examination. In 23 teeth an initial positive response changed to negative within 3 weeks to 9 months, whereas persistent positive reactions were recorded in four teeth. The diagnosis of necrosis was based on the following observations: negative vitality and radiographic changes (76 teeth), negative vitality and discoloration (45 teeth), negative vitality only (nine teeth), positive vitality and radiographic changes (four teeth). External inflammatory root resorption confirmed the diagnosis of necrosis in all replanted teeth and in 13 of 16 intruded teeth. Discoloration and periapical lesions were the most important diagnostic factors following subluxation, extrusive and lingual luxation. Necrosis was disclosed within 4 months in 117 teeth (87%). Diagnoses based on negative vitality and discoloration were made within 6 days to 3 months in all but one case. All external root resorptions and 37 of the 49 periapical lesions were observed within 3 weeks to 4 months of the injury.

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Section: Discussionmentioning

confidence: 68%

Criteria for diagnosis of pulp necrosis in traumatized permanent incisors

Jacobsen

1980

European J Oral Sciences

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“…There are several possible explanations for why the "strangulation" hypothesis of pulpal blood flow during heavy intrusive force application was not upheld. One possibility is that there was insufficient apical displacement of the tooth because of the short-term nature of the force application as well as the limited compressibility of the PDL due to presence of strong collagen fibers and hydraulic dampers system 10,11,12,13 If only 0.028 mm of apical tooth movement occurred and the average width of the PDL at the apex is between 0.18 and 0.21 mm, then the resulting reduction of less than 17% of the PDL space may be insufficient to compress the apical vasculature.…”

Section: Discussionmentioning

confidence: 99%

“…However, when the force application is prolonged, viscoelastic properties of the collagen fibers become more predominant and the tissue of the PDL will creep. In addition, a hydrodynamic damping system has been proposed that would resist rapid axial tooth movement in the short term 10,11,12,13 .…”

Section: Discussionmentioning

confidence: 99%

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Effective Human Pulpal Blood Flow Changes During Brief Intrusive Force Application and Continuous Orthodontic Force Application using Laser Doppler Flowmetry

Sadhasivam¹,

Mds²,

Mds³

2010

J Indian Orthod Soc

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Aims: 1.To study the changes in human pulpal blood flow (PBF)during and after application of intrusive force for 4 minutes in right maxillary central using laser Doppler flowmeter.2.To evaluate the effect on human pulpal blood flow after application of continuous orthodontic intrusive force for 72 hrs in right maxillary central incisor using laser Doppler flowmeter. Material and methods: Brief intrusive force application: Eight subjects (men; mean age = 19.6 yrs) had an intrusive force applied to a maxillary central incisor through lever system. A cast chrome cobalt coping was fabricated to fit over the incisor and thus provided a reproducible point of force application. Each subject participated in six testing sessions (0 gm, 5 gm, 50 gm, 100 gm, 250 gm force application and local anesthetic application). During each session, PBF was measured by laser Doppler flowmeter, 4 mins baseline period, then 4 min force application and then continuously measures next 12 mins. The last session local anesthetic with vasoconstrictor (epinephrine 1:100,000) was administrated in place of the force application to determine the ability of this experimental paradigm to detect reductions in PBF. Continuous orthodontic force application: Seven subjects (men, mean age = 19.6 yrs) were selected and 2 OZ intrusive force applied to a maxillary central incisor using modified utility arch. PBF was measured before application of orthodontic force and after 72 hrs intrusive force application Results: There is no significant reduction in pulpal blood flow during and after the application of brief intrusive force for 4 mins. But there is definite amount of reduction in pulpal blood flow that occurs after application of 2 oz continuous orthodontic force for 3 days. Conclusion: The study result indicates that there is a definite alteration in pulpal blood flow following continuous force application. But pulp does not affected by brief intrusive force.

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“…3. Measured valves of temperature T , a t the center of maxillary first bicuspides vs. time t (on log scale), subsequent to immersion in liquid nitrogen.…”

Section: Temperature Vs Time In a Toothmentioning

confidence: 99%

Thermally induced stresses and rapid temperature changes in teeth

Barker

Rafoth

Ward

1972

J. Biomed. Mater. Res.

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SummaryThe central theme of this paper revolves about an attempt to provide information and ideas that might be useful to persons interested in cryogenic dental procedures. However, a broad spectrum of thermal properties is also considered. For convenience a summary table is given for pertinent thcrmal and mechanical properties of dental materials. A point demonstrated is that observations which are of direct empirical utility to dentists often can be enhanced in value if viewed in terms of simple analytical models. For example, a tooth can be expected to be somewhere between a sphere and a long rod in its cooling or heating characteristics. The importance of the thermal diffisivity rather than thermal conductivity in transient phenomena is discussed. Some graphical techniques that circumvent mathematical difficulties are developed in detail. An isolated extracted tooth in contact with a coolant approaches to within 98% of its final temperature in less than 1 min but in the jaw, in contact with a rold (or hot) probe, the equilibration will take much longer. Thermally generated stresses, either due to differences in expansivities of the dentin and enamel or t o large temperature gradients across a single component, can be quite large (comparable to the reported tensile strength, 9.3 AIN/m2 for enamel) a t cryogenic temperatures. Our observations and analysis make ILS believe that the reported strength of 9.3 MN/mZ is too low by at least an order of magnitude.

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Dynamics of Repair in the Pulp

Cited by 11 publications

References 0 publications

Criteria for diagnosis of pulp necrosis in traumatized permanent incisors

Criteria for diagnosis of pulp necrosis in traumatized permanent incisors

Effective Human Pulpal Blood Flow Changes During Brief Intrusive Force Application and Continuous Orthodontic Force Application using Laser Doppler Flowmetry

Thermally induced stresses and rapid temperature changes in teeth

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