Bone density: comparative evaluation of Hounsfield units in multislice and cone-beam computed tomography

Silva, Isabela Maria de Carvalho Crusoé; Freitas, Deborah Queiroz; Ambrosano, Gláucia María Bovi; Bóscolo, Frab Norberto; Almeida, Solange María de

doi:10.1590/s1806-83242012000600011

Cited by 89 publications

(81 citation statements)

References 21 publications

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“…Multi slice CT (MSCT) scan is an established method to assess the bone density in implant planning and is commonly regarded as the gold standard. However, MSCT systems are associated with 40-60 times more radiation than CBCT systems which have recently gained popularity due to several advantages, among which are lower exposure dose, adequate image quality of the mineralized tissues, low cost, and fast scanning time (9).…”

Section: Discussionmentioning

confidence: 99%

“…Despite these preference factors, the reliability, consistency and accuracy of HU values derived from CBCT imaging systems in bone quality evaluation remain controversial. The imprecision of the intensity values of CBCT systems are commonly attributed to differences in characteristics of the devices, the imaging parameters and the position of the area being evaluated (8,9). However, CBCT systems have improved quantification ability, and the HU values highly correlate with findings of other established methods under certain circumstances.…”

Section: Introductionmentioning

confidence: 99%

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Hounsfield unit comparison of grafted versus non-grafted extraction sockets

et al. 2015

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Volumetric changes of the alveolar ridge after socket preservation with various techniques have been investigated frequently. However, changes in bone density and quality of bone within the extraction sockets have seldom been studied. The purpose of this study was to evaluate the bone quality of grafted versus non-grafted socket sites prior to dental implant placement using Hounsfield unit (HU) values derived from cone-beam computed tomography (CBCT) imaging. The data was collected from 39 healed extraction sites reviewed over a one-year period. Subjects eligible for the study had a bone replacement graft and barrier membrane. Both study and control groups had CBCT scans performed immediately after extraction and four to five months after extraction for planning implant placement. HU values were measured from the CBCT scans and compared between groups. Intragroup variability was assessed utilizing standard deviation and standard error of the mean. Intergroup differences were evaluated using unpaired t-test. A generalized lack of significant difference in bone quality was observed between groups with the only statistically significant difference observed in the posterior maxilla. Future radiographic and histologic assessments of bone quality after socket preservation are required to determine the 'ideal' approach to preserve an extraction socket prior to implant placement. (J Oral Sci 57, [195][196][197][198][199][200] 2015)

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Hounsfield unit comparison of grafted versus non-grafted extraction sockets

et al. 2015

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“…In dentistry CT is still used to evaluate the alveolar bone before implant placement, and the HU values are considered to give the objective and reliable information on the amount and quality of bone [6,7] compared to the subjective in its nature classification system of Lekholm and Zarb [8,9] The increasing application of CBCT to bone density assessment impelled researchers to evaluate the new system in relation to CT. Some studies showed that bone density measurements of the same selected regions in jaws made by means of both methods were not corresponding to each other [10,11] displaying higher HU values for CBCT images [8,10]. The HU values were also different for two different CBCT devices [12].…”

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confidence: 99%

Evaluating Maxilla Bone Quality Through Clinical Investigation of Voxel Grey Scale Values from Cone-Beam Computed Tomography for Dental Use

Andruch¹,

Płachta²

2015

Adv Clin Exp Med

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“…D: Square form basic projection image of the pyramid shape beam instrument (iCAT Classic). The 3D reconstructed image is cylindrically shaped [32,36].The main advantages of dental CBCT are relatively high-resolution acquisition and, compared with conventional CT, lower radiation doses with smaller and less-expensive equipment [11,12,16,17,32,36,[44][45][46][47][48][49][50][51].The next milestone in development was in 2003, when J. Morita Mfg Corporation produced equipment with relatively small volume. In this instrument the patient was already in a seated position (Figure 15 B).…”

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confidence: 99%

“…These may produce one class of artefacts, called metal artefacts, but there are fewer at the level of the occlusion by dental CBCT acquisition than in conventional CT [10,11,15,43,74]. -More noise in the dental CBCT image than in conventional CT [29,36,37,46,48,67,70,71,75]. …”

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confidence: 99%

Examination of Grey Value Accuracy and Improvement of Image Quality in Cone Beam Computed Tomography (CBCT)

Plachtovics

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The WARM operation mode represents that the CBCT machine was switched on for at least two hours before the scan but no detector calibration was performed. WARM+C WARM+C scan protocol is consistent with the cone beam computed tomography scan with the complete calibration sequence after the warming-up period. The two-hour warming-up period preceded the calibration process. WUP warming-up period 2D 2 dimensional 3D 3 dimensional iv Galen's principal interest was in human anatomy but, from about 150 BC [2], Roman law had prohibited the dissection of human cadavers. Because of this restriction, Galen performed anatomical dissections on living (vivisection) and dead animals, mostly focusing on pigs and primates [3]. This work was useful because the anatomical structures of these animals usually closely mirror those of humans. Galen clarified the anatomy of the trachea, and was the first to demonstrate that the larynx generates the voice [4,5]. In one experiment, Galen used bellows to inflate the lungs of a dead animal. In his work De motu musculorum, Galen explained the difference between motor and sensory nerves, discussed the concept of muscle tone, and explained the difference between agonists and antagonists [5,6].Andreas Vesalius ( This environment, which lasted from the second century (Galenius) to the sixteenth century (Vesalius), developed a strong desire to have the ability to see inside the human body [7]. Development of medical imagingDuring many centuries the only way to visualize the inside of the human body was through dissection. With technical development, scientists had started to investigate the inside of the human body without its opening. In 1881, Alexander Graham Bell attempted to use magnets and sound waves to discover the location of the bullet that eventually killed U.S.President James A. Garfield [8].After a lengthy period, during scientific experiments with various types of vacuum tube equipment, the discovery of X-rays in 1895, by the Bavarian physicist Conrad Röntgen, represented a major breakthrough (Figure 3 A). When X-rays were finally discovered, they found their way to medical applications within months [9]. B C A 3The original discovery by Röntgen, at the Physical Institute, Julius-Maximilian University, Würzburg, Germany, is recorded to be on 8 November 1895 [9][10][11][12][13][14][15][16][17]. During the discovery, he speculated that a new kind of ray might be responsible for the observation.Since 8 th November was a Friday, instead of relaxing over the weekend, Röntgen took advantage of the time to repeat his experiments. In the following weeks he investigated many properties of the new rays he had temporarily termed 'X-ray'. In fact, he virtually lived in his laboratory during that time. The new X-ray is called the 'Röntgen ray' in many languages [18]. Nearly two weeks after his discovery, he took the very first picture using X-rays of his wife Anna Bertha's hand. When she saw her skeleton she exclaimed 'I have seen my death!' (Figure 3 B and C) [10,18]. Röntgen receive the fir...

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Bone density: comparative evaluation of Hounsfield units in multislice and cone-beam computed tomography

Cited by 89 publications

References 21 publications

Hounsfield unit comparison of grafted versus non-grafted extraction sockets

Hounsfield unit comparison of grafted versus non-grafted extraction sockets

Evaluating Maxilla Bone Quality Through Clinical Investigation of Voxel Grey Scale Values from Cone-Beam Computed Tomography for Dental Use

Examination of Grey Value Accuracy and Improvement of Image Quality in Cone Beam Computed Tomography (CBCT)

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