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Article: De onbesliste strijd tussen MTA en IRM bij apexresecties – een retrospectief cohortonderzoek.

Schutte, H / van Hooft, E

Nederlands tijdschrift voor tandheelkunde

2022 Volume 129, Issue 1, Page(s) 33–40

Abstract: When endodontic treatment of periapical infection does not suffice, apicoectomy might be the next treatment of choice. Years of treatment development have optimised it as far as possible, but the optimal apical barrier material has still not been ... ...

Title translation	The unresolved contest between MTA and IRM as apical barrier material in apicoectomies. A retrospective cohort study.
Abstract	When endodontic treatment of periapical infection does not suffice, apicoectomy might be the next treatment of choice. Years of treatment development have optimised it as far as possible, but the optimal apical barrier material has still not been indicated. Does MTA as an apical barrier material in apicoectomies effectuate a higher success rate than IRM? A retrospective cohort study analysed all patients who underwent an apicoectomy between 2015 and 2020. Patients for whom the apical barrier material had not been registered, or who were treated by a resident, were excluded. Patients were retrospectively allocated to either the MTA or IRM group. A total of 1,347 treatments were analysed, with an overall success rate of 71%. The MTA group had a success rate of 71%, and the IRM group had a success rate of 70% (p = 0.794). The study revealed that the success rate of apicoectomies was 71%, regardless of the type of material used as the apical barrier. Hence, the use of either material is justified.
MeSH term(s)	Aluminum Compounds ; Apicoectomy ; Calcium Compounds ; Drug Combinations ; Humans ; Oxides ; Pemetrexed ; Retrospective Studies ; Root Canal Filling Materials ; Silicates
Chemical Substances	Aluminum Compounds ; Calcium Compounds ; Drug Combinations ; Oxides ; Root Canal Filling Materials ; Silicates ; Pemetrexed (04Q9AIZ7NO)
Language	Dutch
Publishing date	2022-01-11
Publishing country	Netherlands
Document type	Journal Article
ZDB-ID	603498-6
ISSN	0028-2200
ISSN	0028-2200
DOI	10.5177/ntvt.2022.01.21028
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Heralds of Future Volcanism

Schmid, F. / Petersen, G. / Hooft, E. / Paulatto, M. / Chrapkiewicz, K. / Hensch, M. / Dahm, T.

Geochemistry Geophysics Geosystems (G3)

Swarms of Microseismicity Beneath the Submarine Kolumbo Volcano Indicate Opening of Near‐Vertical Fractures Exploited by Ascending Melts

2022

Abstract: The Kolumbo submarine volcano in the southern Aegean (Greece) is associated with repeated seismic unrest since at least two decades and the causes of this unrest are poorly understood. We present a ten-month long microseismicity data set for the period ... ...

Abstract	The Kolumbo submarine volcano in the southern Aegean (Greece) is associated with repeated seismic unrest since at least two decades and the causes of this unrest are poorly understood. We present a ten-month long microseismicity data set for the period 2006–2007. The majority of earthquakes cluster in a cone-shaped portion of the crust below Kolumbo. The tip of this cone coincides with a low Vp-anomaly at 2–4 km depth, which is interpreted as a crustal melt reservoir. Our data set includes several earthquake swarms, of which we analyze the four with the highest events numbers in detail. Together the swarms form a zone of fracturing elongated in the SW-NE direction, parallel to major regional faults. All four swarms show a general upward migration of hypocenters and the cracking front propagates unusually fast, compared to swarms in other volcanic areas. We conclude that the swarm seismicity is most likely triggered by a combination of pore-pressure perturbations and the re-distribution of elastic stresses. Fluid pressure perturbations are induced likely by obstructions in the melt conduits in a rheologically strong layer between 6 and 9 km depth. We conclude that the zone of fractures below Kolumbo is exploited by melts ascending from the mantle and filling the crustal melt reservoir. Together with the recurring seismic unrest, our study suggests that a future eruption is probable and monitoring of the Kolumbo volcanic system is highly advisable.
Subject code	550
Publishing country	de
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Heralds of Future Volcanism

Schmid, Florian / Petersen, G. / Hooft, E. / Paulatto, M. / Chrapkiewicz, K. / Hensch, M. / Dahm, T.

Swarms of Microseismicity Beneath the Submarine Kolumbo Volcano Indicate Opening of Near‐Vertical Fractures Exploited by Ascending Melts

2022

Abstract	The Kolumbo submarine volcano in the southern Aegean (Greece) is associated with repeated seismic unrest since at least two decades and the causes of this unrest are poorly understood. We present a ten-month long microseismicity data set for the period 2006–2007. The majority of earthquakes cluster in a cone-shaped portion of the crust below Kolumbo. The tip of this cone coincides with a low Vp-anomaly at 2–4 km depth, which is interpreted as a crustal melt reservoir. Our data set includes several earthquake swarms, of which we analyze the four with the highest events numbers in detail. Together the swarms form a zone of fracturing elongated in the SW-NE direction, parallel to major regional faults. All four swarms show a general upward migration of hypocenters and the cracking front propagates unusually fast, compared to swarms in other volcanic areas. We conclude that the swarm seismicity is most likely triggered by a combination of pore-pressure perturbations and the re-distribution of elastic stresses. Fluid pressure perturbations are induced likely by obstructions in the melt conduits in a rheologically strong layer between 6 and 9 km depth. We conclude that the zone of fractures below Kolumbo is exploited by melts ascending from the mantle and filling the crustal melt reservoir. Together with the recurring seismic unrest, our study suggests that a future eruption is probable and monitoring of the Kolumbo volcanic system is highly advisable. Key Points Seismicity is clustered in a cone-shaped volume beneath Kolumbo; the cone's tip coincides with a melt reservoir at 2–4 km depth Seismicity swarms occupy nearby, yet different portions of the crust, ruling out an origin on a single fault Swarms were likely triggered by a combination of fluid pressure perturbations and redistribution of elastic stresses
Subject code	550
Language	English
Publishing date	2022-07-01
Publisher	AGU (American Geophysical Union)
Publishing country	de
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Conference proceedings ; Online: This Rift is on Fire

Preine, Jonas / Hübscher, Christian / Karstens, Jens / Hooft, Emilie / Nomikou, Paraskevi

Volcano-Tectonic Evolution of the Christiana-Santorini-Kolumbo volcanic field, Aegean Sea

2022

Language	English
Publishing country	de
Document type	Conference proceedings ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Magma accumulation beneath Santorini volcano, Greece, from P-wave tomography

McVey, B. / Hooft, E. / Heath, B. / Toomey, D. / Paulatto, M. / Morgan, J. / Nomikou, P. / Papazachos, C.

Geology

2020

Abstract: Despite multidisciplinary evidence for crustal magma accumulation below Santorini volcano, Greece, the structure and melt content of the shallow magmatic system remain poorly constrained. We use three-dimensional (3-D) velocity models from tomographic ... ...

Abstract	Despite multidisciplinary evidence for crustal magma accumulation below Santorini volcano, Greece, the structure and melt content of the shallow magmatic system remain poorly constrained. We use three-dimensional (3-D) velocity models from tomographic inversions of active-source seismic P-wave travel times to identify a pronounced low-velocity anomaly (–21%) from 2.8 km to 5 km depth localized below the northern caldera basin. This anomaly is consistent with depth estimates of pre-eruptive storage and a recent inflation episode, supporting the interpretation of a shallow magma body that causes seismic attenuation and ray bending. A suite of synthetic tests shows that the geometry is well recovered while a range of melt contents (4%–13% to fully molten) are allowable. A thin mush region (2%–7% to 3%–10% melt) extends from the main magma body toward the northeast, observed as low velocities confined by tectono-magmatic lineaments. This anomaly terminates northwest of Kolumbo; little to no melt underlies the seamount from 3 to 5 km depth. These structural constraints suggest that crustal extension and edifice loads control the geometry of magma accumulation and emphasize that the shallow crust remains conducive to melt storage shortly after a caldera-forming eruption. GeoRef Subject Aegean Islands geophysical methods Santorin Europe Greece Greek Aegean Islands Mediterranean region Cyclades magmas Southern Europe
Subject code	550
Language	English
Publishing country	de
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article: Relationship Between Active Faulting/Fracturing and Magmatism Around Santorini: Seismic Anisotropy From an Active Source Tomography Experiment

Heath, B. A. / Hooft, E. E. E. / Toomey, D. R. / Paulatto, M. / Papazachos, C. B. / Nomikou, P. / Morgan, J. V.

Journal of geophysical research. 2021 Aug., v. 126, no. 8

2021

Abstract: In extending volcanic arcs such as the Aegean, tectonic processes exert a significant control on magmatism. Spanning scales from 1 to 10s of km, volcanic vents, edifices, and eruptive centers follow the orientation of, and are located near, fault zones. ... ...

Abstract	In extending volcanic arcs such as the Aegean, tectonic processes exert a significant control on magmatism. Spanning scales from 1 to 10s of km, volcanic vents, edifices, and eruptive centers follow the orientation of, and are located near, fault zones. Whether this tectonic control on magmatism results from individual faults/fractures weakening the crust or because regional stresses control magma input into the crust is debated. Here we investigate the scales of tectonic and magmatic interactions, specifically focusing on the role of local‐scale (<10 km) faults/fractures in controlling magmatism. We infer local‐scale fault/fracture orientations from anisotropic active‐source P‐wave travel‐time tomography to investigate tectonic and magmatic interactions in the upper crust of Santorini Volcano, Greece, and the actively deforming region to the east. We use the anisotropy magnitude and seismic velocity reduction to model the relative distribution of both consistently oriented and randomly oriented faults/fractures. Our results show that oriented faulting/fracturing resulting from regional‐scale (>10 km) tectonic stresses is distributed broadly across the region at 2–3 km depth, approximately paralleling volcanic/magmatic features. On a local‐scale, magmatism is neither localized in areas of higher oriented fault/fracture density, nor is it accommodating enough extensional strain to inhibit oriented faulting/fracturing of host rock. The alignment of magmatic features shows strong tectonic control despite the lack of correlation with local oriented fault/fracture density. These results suggest that magmatic processes are strongly influenced by regional‐scale, not local‐scale, tectonic processes. We infer regional processes have a greater impact on magmatism than local features due to their greater effect at depth.
Keywords	anisotropy ; geophysics ; research ; tectonics ; tomography ; Greece
Language	English
Dates of publication	2021-08
Publishing place	John Wiley & Sons, Ltd
Document type	Article
Note	JOURNAL ARTICLE
ISSN	2169-9313
DOI	10.1029/2021JB021898
Database	NAL-Catalogue (AGRICOLA)

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Article ; Online: Magma chamber detected beneath an arc volcano with full-waveform inversion of active-source seismic data

Chrapkiewicz, Kajetan / Paulatto, Michele / Heath, Benjamin / Hooft, Emilie / Nomikou, Paraskevi / Papazachos, Constantinos / Schmid, Florian / Toomey, Douglas / Warner, Michael / Morgan, Joanna

2022

Abstract: Arc volcanoes are underlain by complex systems of molten-rock reservoirs ranging from melt-poor mush zones to melt-rich magma chambers. Petrological and satellite data indicate that eruptible magma chambers form in the topmost few kilometres of the crust. ...

Abstract	Arc volcanoes are underlain by complex systems of molten-rock reservoirs ranging from melt-poor mush zones to melt-rich magma chambers. Petrological and satellite data indicate that eruptible magma chambers form in the topmost few kilometres of the crust. However, very few chambers have ever been definitively located, suggesting that most are too short-lived or too small to be imaged, which has direct implications for hazard assessment and modelling of magma differentiation. Here we use a high-resolution technology based on inverting full seismic waveforms to image a small, high-melt-fraction magma chamber that was not detected with standard seismic tomography. The melt reservoir extends from ∼2 to at least 4 km below sea level (b.s.l.) at Kolumbo – a submarine volcano near Santorini, Greece. The chamber coincides with the termination point of the recent earthquake swarms and may be a missing link between a deeper melt reservoir and the high-temperature hydrothermal system venting at the crater floor. The chamber poses a serious hazard as it could produce a highly explosive, tsunamigenic eruption in the near future. Our results suggest that similar reservoirs (relatively small but high-melt-fraction) may have gone undetected at other active volcanoes, challenging the existing eruption forecasts and reactive-flow models of magma differentiation. Key Points A shallow, very strong negative Vp anomaly imaged under the explosive, submarine Kolumbo volcano, Greece, using full-waveform inversion The high-fidelity image and petrologic data indicate the anomaly is a small (∼0.6-km wide, ∼2-km deep), magma chamber with ∼42% of melt The chamber was missed by travel-time tomography indicating similar reservoirs may have gone undetected at other volcanoes
Subject code	550
Language	English
Publisher	AGU (American Geophysical Union)
Publishing country	de
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Conference proceedings ; Online: Revising the volume of the Minoan eruption (Santorini) based on new marine geophysical and sedimentological data

Karstens, Jens / Schmid, Florian / Elger, Judith / Berndt, Christian / Crutchley, Gareth J. / Kutterolf, Steffen / Kühn, Michel / Preine, J. / Van der Bilt, W. / Hooft, E. / Druitt, T.H. / Cederstroem, J.M. / Hübscher, C. / Nomikou, P. / Carey, S.

2022

Abstract: With a maximum volume estimate of up to 86 km³ dense-rock equivalent (DRE), the Minoan Eruption is considered one of the largest Holocene eruptions. However, as most eruption products were deposited in the Mediterranean, previous volume estimates based ... ...

Abstract	With a maximum volume estimate of up to 86 km³ dense-rock equivalent (DRE), the Minoan Eruption is considered one of the largest Holocene eruptions. However, as most eruption products were deposited in the Mediterranean, previous volume estimates based on a limited database. We present new marine geophysical and sedimentological datasets allowing us to reassess the volume of the Minoan eruption in unprecedented detail. We combine high- resolution reflection seismic and P-wave tomography datasets with more than 40 marine sediment cores, constrained by X-ray computer-tomography (CT) scanning. The reflection seismic profiles indicate an ignimbrite volume of ~5.7 km³ DRE deposited on Santorini’s flanks, which is seven times smaller than previous estimates, while the P-wave tomography indicates ~5.5 km³ DRE of Minoan intra-caldera deposits, which is four times smaller than previous estimates. CT-guided analysis of the sediment cores allows us to differentiate two ash layers, which are separately integrated into ash deposit isopach maps and allows determine deposit porosities with high accurary. The combined ash volume of ~19.5 km³ DRE is in the same order as previous estimates. This yields a total eruption volume of ~31 km³ DRE. In addition, we use the new datasets to constrain the post-eruptive topography of the caldera and estimate the caldera collapse volume to be ~31.5 km³. The internal consistency of both independent approaches implies high confidence in our estimates, likely representing the most precise volume reconstruction of any major (M6.5+) volcanic eruption in the Holocene. Our analysis implies that the Minoan Eruption was smaller and produced significantly less ignimbrites than previous reconstructions indicated, while still causing a devastating tsunami. This highlights the significant tsunamigenic potential of submarine- emplaced ignimbrites
Subject code	333
Language	English
Publishing country	de
Document type	Conference proceedings ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Tectonism and Its Relation to Magmatism Around Santorini Volcano From Upper Crustal P Wave Velocity

Heath, B. / Hooft, E. / Toomey, D. / Papazachos, C. / Nomikou, P. / Paulatto, M. / Morgan, J. / Warner, M.

Journal of Geophysical Research: Solid Earth

2019

Abstract: At extensional volcanic arcs, faulting often acts to localize magmatism. Santorini is located on the extended continental crust of the Aegean microplate and is one of the most active volcanoes of the Hellenic arc, but the relationship between tectonism ... ...

Abstract	At extensional volcanic arcs, faulting often acts to localize magmatism. Santorini is located on the extended continental crust of the Aegean microplate and is one of the most active volcanoes of the Hellenic arc, but the relationship between tectonism and magmatism remains poorly constrained. As part of the Plumbing Reservoirs Of The Earth Under Santorini experiment, seismic data were acquired across the Santorini caldera and the surrounding region using a dense amphibious array of >14,300 marine sound sources and 156 short‐period seismometers, covering an area 120 km by 45 km. Here a P wave velocity model of the shallow, upper‐crustal structure (<3‐km depth), obtained using travel time tomography, is used to delineate fault zones, sedimentary basins, and tectono‐magmatic lineaments. Our interpretation of tectonic boundaries and regional faults are consistent with prior geophysical studies, including the location of basin margins and E‐W oriented basement faults within the Christiana Basin west of Santorini. Reduced seismic velocities within the basement east of Santorini, near the Anydros and Anafi Basins, are coincident with a region of extensive NE‐SW faulting and active seismicity. The structural differences between the eastern and western sides of Santorini are in agreement with previously proposed models of regional tectonic evolution. Additionally, we find that regional magmatism has been localized in NE‐SW trending basin‐like structures that connect the Christiana, Santorini, and Kolumbo volcanic centers. At Santorini itself, we find that magmatism has been localized along NE‐SW trending lineaments that are subparallel to dikes, active faults, and regional volcanic chains. These results show strong interaction between magmatism and active deformation.
Subject code	550
Language	English
Publishing country	de
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article: Letsel na irrigatie met natriumhypochloriet tijdens een endodontische behandeling.

van Hooft, E / van Es, R J J

Nederlands tijdschrift voor tandheelkunde

2008 Volume 115, Issue 3, Page(s) 157–160

Abstract: A 58-year-old woman was referred by her dentist to a maxillofacial surgeon because of a rapidly increasing facial swelling. The swelling developed after sodium hypochlorite irrigation during the endodontic treatment of tooth 25. A mechanical heart valve, ...

Title translation	Injury following sodium hypochlorite irrigation during endodontic treatment.
Abstract	A 58-year-old woman was referred by her dentist to a maxillofacial surgeon because of a rapidly increasing facial swelling. The swelling developed after sodium hypochlorite irrigation during the endodontic treatment of tooth 25. A mechanical heart valve, a heart rhythm disorder, and antithrombotic therapy were complicating medical conditions. Treatment consisted of 12 mg dexamethason administered once intravenously, augmentin administered thrice daily intravenously, and oral analgetics. Damage following sodium hypochlorite irrigation during endodontic treatment is a rare disorder which is associated with a severe reaction in the surrounding tissue. Damage can be permanent.
MeSH term(s)	Amoxicillin-Potassium Clavulanate Combination/therapeutic use ; Dexamethasone/therapeutic use ; Facial Injuries/chemically induced ; Facial Injuries/drug therapy ; Facial Injuries/pathology ; Female ; Humans ; Middle Aged ; Mouth Mucosa/drug effects ; Mouth Mucosa/pathology ; Necrosis ; Root Canal Irrigants/administration & dosage ; Root Canal Irrigants/adverse effects ; Sodium Hypochlorite/administration & dosage ; Sodium Hypochlorite/adverse effects ; Treatment Outcome
Chemical Substances	Root Canal Irrigants ; Amoxicillin-Potassium Clavulanate Combination (74469-00-4) ; Dexamethasone (7S5I7G3JQL) ; Sodium Hypochlorite (DY38VHM5OD)
Language	Dutch
Publishing date	2008-03
Publishing country	Netherlands
Document type	Case Reports ; English Abstract ; Journal Article
ZDB-ID	603498-6
ISSN	0028-2200
ISSN	0028-2200
Database	MEDical Literature Analysis and Retrieval System OnLINE

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