Magnetic resonance imaging in human teeth internal space visualization for requirements of dental prosthetics

Abstract

Objectives: The aim of this work has been a verification possibility to use 3D spin echo magnetic resonance imaging techniques in the dentistry within the scope of a dimensional imaging of the inner spaces of teeth during an prosthetic procedure. Methods: 6 extracted molar teeth were used after preparation for the inner root canals fixations. Magnetic resonance (MR) measurements were carried out on a 4.7 T MRI system with Maran DRX console and home built actively shielded gradient coils and rf probe head. Results: Research proceedings made it possible to compare the quality of internal tooth space after preparation for inner root canals fixations constructed using both classical methods (polymer mass impression) and non-imressional methods (MRI representation) Conclusions: A numerical model of prepared root canals obtained with the method of the magnetic resonance visualization may constitute in the future a basis for a non-impressional technique of imaging, usefull for dental prosthetics. A numerical model of the prepared root canals obtained with the method of the magnetic resonance visualization imaging combined with the method of images analysis, may in the future constitute a basis for an automatic 3D modelling of the inner root canals fixations, supported with computer applications dedicated for the designing purposes (CAD-computer aided design).

The effect of 3 T MRI on microleakage of amalgam restorations

“…5,6 MRI of the craniomaxillofacial area is currently used to examine salivary glands, articular pathologies of the temporomandibular joint, inflammatory changes of the orofacial region, maxillary sinuses, muscles, haematomas, space infections, head and neck masses and lymphatics, early pathological changes in bones, fractures and anatomical contiguities. 4,6,7,9,10 MRI is also used for planning dental implants and locating and evaluating the loci of facial skeletal growth. 9 MRI systems produce magnetic fields whose strengths are expressed in units of Tesla, with 1 T equal to 10 000 G (by comparison, the earths' magnetic field is approximately 0.5 G).…”

“…4,6,7,9,10 MRI is also used for planning dental implants and locating and evaluating the loci of facial skeletal growth. 9 MRI systems produce magnetic fields whose strengths are expressed in units of Tesla, with 1 T equal to 10 000 G (by comparison, the earths' magnetic field is approximately 0.5 G). MRI scanners with homogenous and stable field strengths ranging from 0.15 T to 11 T may be used on humans, whereas units of up to 24 T may be used in animal experiments.…”

Effect of Continuous Echo-Planer Imaging Pulse (Epi) on Residual Monomer and Color Stability of Self-Cure Acrylic Resin

“…The electrical properties of self-cure acrylic resin can be sharply affected by the absorption of humidity, it is resistance to arcing is excellent, and since PMMA is electrostatic which can spoil it's appearance (attraction of dust), this drawback can be corrected by using of ant-static product's [2]. "T1", "T2" Relaxations and energy groups "T1" or longitudinal or "spin-lattice relaxation "time refer to events happened from start of magnetization until it reach equilibrium, and the nuclei during "T1" give-up the energy gained from the transmitted radio-frequency pulse to returnee to equilibrium and the hydrogen-nuclei are bond with other atoms to form a molecule.…”

Human tooth pulp anatomy visualization by 3D magnetic resonance microscopy

“…Tanasiewicz demonstrated the use of the 3D spin-echo MR imaging technique as a tool to visualize the inner space in the root canal system during the prosthodontic procedure for post preparation. 26 …”