Quantitative analysis of MRI signal intensity as a tool for evaluating tooth pulp vitality

Kress, Bodo; Buhl, Yvonne Agnes; Anders, L.; Stippich, Christoph; Palm, Fredrik; Bähren, W; Sartor, Klaus

doi:10.1259/dmfr/33063878

Cited by 40 publications

(34 citation statements)

References 6 publications

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“…Application of a contrast agent to the pulp can be considered. Previously, intravenous contrast agent administration was used to visualize the dental pulp [33] and to evaluate pulp vitality [34]. This method was also shown to be suitable for assessing reperfusion of autotransplanted teeth [35] and for monitoring pulp cavity signal intensity changes with age [36].…”

Section: Discussionmentioning

confidence: 99%

High-resolution 3D magnetic resonance imaging and quantification of carious lesions and dental pulp in vivo

Tymofiyeva

Boldt

Rottner

et al. 2009

Magn Reson Mater Phy

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Section: Discussionmentioning

confidence: 99%

High-resolution 3D magnetic resonance imaging and quantification of carious lesions and dental pulp in vivo

Tymofiyeva

Boldt

Rottner

et al. 2009

Magn Reson Mater Phy

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“…However, up to now, only a few reports have been published on the application of MRI in dentistry mainly due to the limited access of dentists to MRI and limitations of MRI arising from metal artifacts caused by dental fillings. Without being used widely, reported applications of MRI in dentistry include the assessment of extracranial tumors [18 -21], the assessment of the morphology and function of the temporomandibular joint [22 -27], the planning of dental implantation procedures [28 -32], planning and evaluating orthodontics and orthognathic surgery [33], the assessment of impacted teeth [34] and the mandibular and the trigeminal nerve channel [35 -41], caries diagnosis [42 -45], assessment of dental pulp [46,47], or for imaging of the mandible and mandibular for other purposes [48 -50]. With the introduction of faster imaging techniques that are less sensitive to dental filling material and the advent of new compounds, the application of MRI for periapical lesion diagnosis and characterization appears increasingly attractive and should be reconsidered.…”

Section: Materials Und Methoden: In Die Studie Wurden 19mentioning

confidence: 99%

Assessment of Apical Periodontitis by MRI: A Feasibility Study

Geibel

Schreiber

Bracher

et al. 2015

Fortschr Röntgenstr

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Purpose: The purpose of this clinical feasibility study was to evaluate the applicability of magnetic resonance imaging (MRI) for the assessment of apical periodontitis in direct comparison with cone beam CT (CBCT). Materials and Methods: 19 consecutive patients (average age 43???13 years) with 34 lesions in total (13 molars, 14 premolars and 7 front teeth) were enrolled in this feasibility study. Periapical lesions were defined as periapical radiolucencies (CBCT) or structural changes in the spongy bone signal (MRI), which were connected with the apical part of a root and with at least twice the width of the periodontal ligament space. The location and dimension of the lesions were compared between MRI and CBCT. Results: While mainly mineralized tissue components such as teeth and bone were visible with CBCT, complimentary information of the soft tissue components was assessable with MRI. The MRI images provided sufficient diagnostic detail for the assessment of the main structures of interest. Heterogeneous contrast was observed within the lesion, with often a clear enhancement close to the apical foramen and the periodontal gap.?No difference for lesion visibility was observed between MRI and CBCT. The lesion dimensions corresponded well, but were slightly but significantly overestimated with MRI. A heterogeneous lesion appearance was observed in several patients. Four patients presented with a well circumscribed hyperintense signal in the vicinity of the apical foramen. Conclusion: The MRI capability of soft tissue characterization may facilitate detailed analysis of periapical lesions. This clinical study confirms the applicability of multi-contrast MRI for the identification of periapical lesions. Key Points: ??MRI can be applied for the identification of periapical lesions without ionizing radiation exposure ??MRI might facilitate more detailed characterization of periapical lesions ??MRI might provide more accurate lesion dimensions as X-ray-based methods Citation Format: ??Geibel MA., Schreiber ES, Bracher AK et?al. Assessment of Apical Periodontitis by MRI: A Feasibility Study. Fortschr R?ntgenstr 2015; 187: 269???275

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“…A series of standard dental materials from different classes listed in Table 1 ; matrix, 320 3 320 3 72; bandwidth, 190 Hz per pixel. Image distortions were analysed for cylindrically shaped materials by measuring the length L z in the SE images ( Figure 1) and the magnetic susceptibility was estimated according to Equation (1).…”

Section: In Vitro Measurementsmentioning

confidence: 99%

“…This classification also serves as a definition of "detectable", "noticeable" and "strong" image distortions by relating the distortion length L z to the actual radius R of the cylindrically shaped material through Equation (1).…”

Section: In Vitro Measurementsmentioning

confidence: 99%

See 1 more Smart Citation

Influence of dental materials on dental MRI

Tymofiyeva¹,

Vaegler²,

Rottner³

et al. 2013

Dentomaxillofacial Radiology

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Objectives: To investigate the potential influence of standard dental materials on dental MRI (dMRI) by estimating the magnetic susceptibility with the help of the MRI-based geometric distortion method and to classify the materials from the standpoint of dMRI. Methods: A series of standard dental materials was studied on a 1.5 T MRI system using spin echo and gradient echo pulse sequences and their magnetic susceptibility was estimated using the geometric method. Measurements on samples of dental materials were supported by in vivo examples obtained in dedicated dMRI procedures. Results: The tested materials showed a range of distortion degrees. The following materials were classified as fully compatible materials that can be present even in the tooth of interest: the resinbased sealer AH Plus ® (Dentsply, Maillefer, Germany), glass ionomer cement, gutta-percha, zirconium dioxide and composites from one of the tested manufacturers. Interestingly, composites provided by the other manufacturer caused relatively strong distortions and were therefore classified as compatible I, along with amalgam, gold alloy, gold-ceramic crowns, titanium alloy and NiTi orthodontic wires. Materials, the magnetic susceptibility of which differed from that of water by more than 200 ppm, were classified as non-compatible materials that should not be present in the patient's mouth for any dMRI applications. They included stainless steel orthodontic appliances and CoCr. Conclusions: A classification of the materials that complies with the standard grouping of materials according to their magnetic susceptibility was proposed and adopted for the purposes of dMRI. The proposed classification can serve as a guideline in future dMRI research.

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Quantitative analysis of MRI signal intensity as a tool for evaluating tooth pulp vitality

Abstract: Contrast-enhanced MRI enables us to draw conclusions on pulpal perfusion in vivo.

Cited by 40 publications

References 6 publications

High-resolution 3D magnetic resonance imaging and quantification of carious lesions and dental pulp in vivo

High-resolution 3D magnetic resonance imaging and quantification of carious lesions and dental pulp in vivo

Assessment of Apical Periodontitis by MRI: A Feasibility Study

Influence of dental materials on dental MRI

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