scholarly journals Advocacy of diagnostic criteria for maxillary incisive canal cysts based on alteration of normal maxillary incisive canals according to aging in Japanese populations

2019 ◽  
Vol 15 (1) ◽  
Author(s):  
Naruhiko Ueda ◽  
Tatsurou Tanaka ◽  
Masafumi Oda ◽  
Nao Wakasugi-Sato ◽  
Shinobu Matsumoto-Takeda ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Diagnostic Criteria ◽  
Normal Subjects ◽  
Anatomic Variations ◽  
Imaging Findings ◽  
Cystic Change ◽  
Incisive Canal ◽  
Significant Difference ◽  
Males And Females ◽  
Age Over 60

Abstract Background The purpose of the present study was to describe the CT imaging findings of normal incisive canals and incisive canal cysts and propose cut-off values to differentiate between them. Methods A total of 220 normal subjects and 40 patients with incisive canal cysts on multi-detector row computed tomography (MDCT) were retrospectively analyzed. The shapes, sizes, anatomic variations, Hounsfield scale values, and so on of maxillary incisive canals and the sizes and Hounsfield scale values of maxillary incisive canal cysts were analyzed. Results A significant difference in sizes of maxillary incisive canals in normal subjects was found between males and females. The sizes of maxillary incisive canals were significantly wider during aging, but shapes, anatomic variations, and Hounsfield scale values in the maxillary incisive canals were not significantly different with aging. A significant difference in sizes but not Hounsfield scale values was found between normal maxillary incisive canals and maxillary incisive canal cysts. Based on a cut-off of over 6 mm in the width of incisive canals, maxillary incisive canal cysts could not be appropriately diagnosed for subjects over 60 years of age. Over 60 years of age, maxillary incisive canal cysts could be appropriately diagnosed based on a cut-off of over 7.1 mm in width of incisive canals. When maxillary incisive canals of the hourglass types were seen on sagittal sections, significantly more patients had maxillary incisive canal cysts than other types. Conclusion In coincidentally diagnosing asymptomatic incisive canal cysts on imaging, we should apply different cut-offs for the size of the maxillary incisive canal for patients over and under 60 years of age. Specifically, the cut-offs for the long axis of maxillary incisive canal cysts were 7.1 mm for patients over 60 years of age and 6.0 mm for those under 60 years of age. In addition, we should pay attention to wider canals with hourglass shapes as indicative of cystic change of maxillary incisive canals.

Radiological observations on the olfactory fossa and ethmoid roof

2010 ◽  
Vol 124 (12) ◽  
pp. 1251-1256 ◽  
Author(s):  
S Elwany ◽  
A Medanni ◽  
M Eid ◽  
A Aly ◽  
A El-Daly ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Multislice Computed Tomography ◽  
Cribriform Plate ◽  
Type I ◽  
Adult Males ◽  
Significant Difference ◽  
Computed Tomography Scans ◽  
Operative Evaluation ◽  
Males And Females ◽  
The Right

AbstractObjective:To establish normative dimensions for the depth of the olfactory fossa, the length and angulation of the lateral lamella of the cribriform plate, and the height of the ethmoid roof, in adult males and females.Design:The study assessed 300 high resolution, multislice computed tomography scans of the paranasal sinuses, which were evaluated using Merge Efilm software (version 2.0.0, build 37).Results:According to the original Keros classification, the type II olfactory fossa was the commonest type in men (66.7 per cent), while the type I fossa was commonest in women (53 per cent). A difference of 3 mm or more between the depths of the right and left olfactory fossae was present in 11 per cent of men and 2 per cent of women. The lateral lamella of the cribriform plate was significantly shorter and less oblique in men than in women. The length of the lateral lamella was greater anteriorly than posteriorly in both sexes. There was a statistically significant difference between the angle of the lateral lamellae, comparing right and left sides. The ethmoid roof was lower in women than men.Conclusion:The observed differences between men and women and between the right and left sides are of surgical importance, and should alert surgeons to the need for thorough, systematic pre-operative evaluation of computed tomography scans.

scholarly journals Correlation of Tooth Contact Habit in Patients with Signs and Symptoms of Temporomandibular Disorders and Healthy Normal Subjects

2014 ◽  
Vol 02 (01) ◽  
pp. 022-025
Author(s):  
Subhash Vasudeva ◽  
Asha Iyengar ◽  
Nagesh Seetaramaiah
Keyword(s):  
Temporomandibular Disorders ◽  
Signs And Symptoms ◽  
Normal Subjects ◽  
Tooth Contact ◽  
Normal Individuals ◽  
Significant Difference ◽  
History Of ◽  
Males And Females ◽  
Group 2 ◽  
Group 1

Abstract Purpose: Temporomandibular disorders are among the common musculoskeletal conditions affecting the individual. Modern day lifestyle and work environment may introduce abnormal habits like constant tooth contact habit which may have a role in the pathogenesis of temporomandibular disorder. This study aimed to correlate the prevalence of tooth contact habits in individuals suffering from TMD and compare them with that of normal individuals without any signs and symptoms of TMD. Material and Methods: 505 individuals were included in the study. They were divided into 2 groups. Group 1 consisted of 255 individuals who presented with signs and symptoms of temporomandibular disorders and group 2 consisted of 250 normal individuals. Detailed case history with emphasis on habits of constant tooth contact was recorded. Fischer's t test was used to compare the results between the two groups. Results: In group 1,54.5% of males and 58.02% of females gave a history of tooth contact habit while in group 2 individuals 38.7% males and 39.8% females gave a history of this habit. There was no statistically significant difference between males and females of group 1 with regard to this habit. There was a statistically significant difference between group 1 and group 2 individuals (both males and females combined) with regards to this habit. (p= 0.0003) Conclusion: Individuals with temporomandibular disorders exhibited higher prevalence of tooth contact habit when compared to normal subjects.

scholarly journals Assessment of the Mandibular Incisive Canal by Panoramic Radiograph and Cone-Beam Computed Tomography

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Ricardo Raitz ◽  
Elisabeth Shimura ◽  
Israel Chilvarquer ◽  
Marlene Fenyo-Pereira
Keyword(s):  
Computed Tomography ◽  
Cone Beam Computed Tomography ◽  
Preoperative Planning ◽  
Panoramic Radiograph ◽  
Mental Foramen ◽  
Cone Beam ◽  
Anterior Portion ◽  
Incisive Canal ◽  
Significant Difference ◽  
Examination Methods

Objectives.The region between mental foramens is considered as a zone of choice for implants. However, complications may arise due to an extension anterior to the mental foramen that forms the mandible incisive canal [MIC]. Our goal is to evaluate identification of MIC by both panoramic radiograph [PAN] and cone-beam computed tomography [CBCT].Methods.150 cases with bilateral MIC were analyzed. Images of a radiolucent canal, within the trabecular bone, surrounded by a radiopaque cortical bone representing the canal walls, and extending to the anterior portion beyond the mental foramen, were considered by two independent radiologists as being images of MIC. PAN and CBCT of these cases were evaluated by 2 other radiologists at different times. Agreement between results of examination methods was assessed by the Kappa coefficient. The interexaminer and intramethod rates for detection of MIC were analyzed by the McNemar test. Gender, mandible side, examiner, and type of method were analyzed by the generalized estimating equations [GEE] model.Results.significant difference between examiners [PAN: P=0.146; CBCT:P=0.749] was not observed. Analysis by GEE model showed no significant difference between genders[P=0.411]and examiners[P=0.183]. However, significant difference was observed for identification in both mandible right side[P=0.001], where the identification frequency was higher, and CBCT method[P<0.001].Conclusions.PAN was not shown to be a safe examination to identify MIC. CBCT should always be used in preoperative planning and to reduce the number of complications in implant surgeries.

scholarly journals Facial Flatness Indices: A Comparison of Two Methods of Assessment

2020 ◽  
Vol 10 ◽  
pp. 68
Author(s):  
Chimène Chalala ◽  
Maria Saadeh ◽  
Fouad Ayoub
Keyword(s):  
Computed Tomography ◽  
Cone Beam Computed Tomography ◽  
Three Dimensional ◽  
Cone Beam ◽  
Class Iii ◽  
Direct Measurements ◽  
Significant Difference ◽  
Males And Females ◽  
Trigonometric Formula

Objectives: The objective of the study was to evaluate and compare facial flatness indices calculated from the trigonometric formula as opposed to those generated from the direct measurements on three-dimensional radiographs. Material and Methods: A total of 322 cone-beam computed tomography radiographs were digitized and three facial indices (frontal, simotic, and zygomaxillary) were assessed in two different methods and compared between different groups. Results: There was a discrepancy between facial flatness indices generated from the two different approaches. The highest difference was seen in the findings of the simotic index and the lowest for the zygomaxillary index. No statistically significant difference was displayed in the three formula-generated flatness indices between males and females and between growing and non-growing subjects (P > 0.05). The zygomaxillary index was the only measurement revealing no statistically significant difference in Class III sagittal malocclusions (t = −0.5 P = 0.621). The orthodontic application would yield to the same interpretations for both ways of indices calculation. Conclusion: The validity of the trigonometric formula used to appraise facial flatness indices might be questionable. The zygomaxillary index could be more clinically considered compared to the frontal and simotic indices.

Lingual Discrimination of Angular Changes of a Grooved Line by Normal Subjects

1974 ◽  
Vol 38 (2) ◽  
pp. 579-582 ◽  
Author(s):  
William N. Williams ◽  
Leonard L. La Pointe ◽  
John E. Riski
Keyword(s):  
Young Adults ◽  
Horizontal Plane ◽  
Vertical Plane ◽  
Normal Subjects ◽  
Angular Deviation ◽  
Vertical Orientation ◽  
Oral Region ◽  
Significant Difference ◽  
Males And Females ◽  
Perceptual Characteristics

To explore the perceptual characteristics of the oral region, 20 young adults were required to trace lingually a groove scored in a plastic disc and report its horizontal or vertical orientation. Performance was significantly better ( P < .001) in perceiving orientation around the horizontal plane than around the vertical. An angular deviation of 30° was required before all Ss could detect that the groove was not in the horizontal or vertical plane. No significant difference ( P > .05) was found in performance by males and females.

scholarly journals Tibia vara in Asians: Myth or fact? Verification with three-dimensional computed tomography

2021 ◽  
Vol 29 (1) ◽  
pp. 230949902199261
Author(s):  
Jade Pei Yuik Ho ◽  
Azhar Mahmood Merican ◽  
Khairul Anwar Ayob ◽  
Shahrul-Hisham Sulaiman ◽  
Muhammad Sufian Hashim
Keyword(s):  
Computed Tomography ◽  
Three Dimensional ◽  
3D Analysis ◽  
3 Dimensional ◽  
Significant Difference ◽  
Males And Females ◽  
The Mean ◽  
Post Hoc ◽  
Best Fit ◽  
Standard Frame

Background: There is a common perception among surgeons that Asian tibiae are significantly more varus compared to non-Asians, contributed both by an acute medial tibial proximal angle (MPTA) and diaphyseal bowing. Insight into the normative morphology of the tibia allows generation of knowledge towards disease processes and subsequently planning for corrective surgeries. Methods: Computed tomography (CT) scans of 100 normal adult knees, aged 18 years and above, were analysed using a 3-dimensional (3D) analysis software. All tibiae were first aligned to a standard frame of reference and then rotationally aligned to the tibial centroid axis (TCAx) and the transmalleolar axis (tmAx). MPTA was measured from best-fit planes on the surface of the proximal tibia for each rotational alignment. Diaphyseal bowing was assessed by dividing the shaft to three equal portions and establishing the angle between the proximal and distal segments. Results: The mean MPTA was 87.0° ± 2.2° (mean ± SD) when rotationally aligned to TCAx and 91.6° ± 2.7° when aligned to tmAx. The mean diaphyseal bowing was 0.1° ± 1.9° varus when rotationally aligned to TCAx and 0.3° ± 1.6° valgus when aligned to tmAx. The mean difference when the MPTA was measured with two different rotational alignments (TCAx and tmAx) was 4.6° ± 2.3°. No statistically significant differences were observed between males and females. Post hoc tests revealed statistically significant difference in MPTA between different ethnic sub-groups. Conclusion: The morphology of the proximal tibiae in the disease-free Asian knee is inherently varus but not more so than other reported populations. The varus profile is contributed by the MPTA, with negligible diaphyseal bowing. These implications are relevant to surgical planning and prosthesis design.

Auditory Selective Attention in Cerebral-Palsied Individuals

1985 ◽  
Vol 16 (4) ◽  
pp. 260-266 ◽  
Author(s):  
Lee Ann Laraway
Keyword(s):  
Selective Attention ◽  
White Noise ◽  
Normal Subjects ◽  
Auditory Selective Attention ◽  
Normal Individuals ◽  
Significant Difference

The purpose of this study was to determine whether there is a statistically significant difference between the auditory selective attention abilities of normal and cerebral-palsied individuals. Twenty-three cerebral-palsied and 23 normal subjects between the ages of 5 and 21 were asked to repeat a series of 30 items consisting of from 2 to 4 digits in the presence of intermittent white noise. Results of the study indicate that cerebral-palsied individuals perform significantly poorer than normal individuals when the stimulus is accompanied by noise. Noise was not a significant factor in the performance of the normal subjects regardless of age.

A Specific Immunologic Assay for Functional Plasminogen Activator Inhibitor 1 in Plasma – Standardized Measurements of the Inhibitor and Related Parameters in Patients with Venous Thromboembolic Disease

1992 ◽  
Vol 68 (05) ◽  
pp. 486-494 ◽  
Author(s):  
Malou Philips ◽  
Anne-Grethe Juul ◽  
Johan Selmer ◽  
Bent Lind ◽  
Sixtus Thorsen
Keyword(s):  
Plasminogen Activator ◽  
Plasminogen Activator Inhibitor ◽  
Normal Subjects ◽  
Tissue Type ◽  
Blood Collection ◽  
Plasminogen Activator Inhibitor 1 ◽  
Type Plasminogen Activator ◽  
Significant Difference ◽  
Activator Inhibitor ◽  
Pai 1

SummaryA new assay for functional plasminogen activator inhibitor 1 (PAI-1) in plasma was developed. The assay is based on the quantitative conversion of PAI-1 to urokinase-type plasminogen activator (u-PA)-PAI-l complex the concentration of which is then determined by an ELISA employing monoclonal anti-PAI-1 as catching antibody and monoclonal anti-u-PA as detecting antibody. The assay exhibits high sensitivity, specificity, accuracy, and precision. The level of functional PAI-1, tissue-type plasminogen activator (t-PA) activity and t-PA-PAI-1 complex was measured in normal subjects and in patients with venous thromboembolism in a silent phase. Blood collection procedures and calibration of the respective assays were rigorously standardized. It was found that the patients had a decreased fibrinolytic capacity. This could be ascribed to high plasma levels of PAI-1. The release of t-PA during venous occlusion of an arm for 10 min expressed as the increase in t-PA + t-PA-PAI-1 complex exhibited great variation and no significant difference could be demonstrated between the patients with a thrombotic tendency and the normal subjects.

Comparative Plasma Heparin Levels after Subcutaneous Sodium and Calcium Heparin

1978 ◽  
Vol 40 (02) ◽  
pp. 397-406 ◽  
Author(s):  
Joyce Low ◽  
J C Biggs
Keyword(s):  
Peak Plasma ◽  
Plasma Concentrations ◽  
Factor Xa ◽  
Normal Subjects ◽  
Sodium Salts ◽  
Sodium Heparin ◽  
Significant Difference ◽  
Heparin Plasma ◽  
Calcium Heparin ◽  
Plasma Heparin

SummaryComparative plasma heparin levels were measured in normal subjects injected subcutaneously with 5,000 units of the sodium and calcium salts of heparin. Plasma heparin levels were measured up to 7 hr post-injection by an anti-factor Xa assay (Denson and Bonnar 1973). Preliminary studies indicated that heparin levels were reproducible in subjects who received two injections of the same heparin. Peak plasma concentrations (Cmax) and the time at which peak concentration was reached (Tmax) varied greatly from subject to subject. In one group of subjects (15) two commonly used heparins, a sodium heparin (Evans) and a calcium heparin (Choay) were compared. Peak heparin concentrations were not significantly different. However the Tmax for the sodium heparin (1.5 hr) was significantly earlier than the Tmax for the calcium heparin (3 hr) and this was not due to a difference in the volume of the two heparin injections. No significant difference could be detected in the plasma clearance rate and the molecular weight distribution of the two heparins.In two other groups of subjects, sodium and calcium preparations from two manufacturers were compared. In general, the sodium salts gave rise to significantly higher plasma concentrations, which could be interpreted as a greater bioavailability of sodium salts. These results indicate that the salt of the heparin can influence the plasma concentration achieved after subcutaneous injection.

A COMPARISON OF TWO METHODS FOR MEASUREMENT OF ALDOSTERONE SECRETION RATE IN MAN

1966 ◽  
Vol 53 (2) ◽  
pp. 177-188 ◽  
Author(s):  
P. Lund-Johansen ◽  
T. Thorsen ◽  
K. F. Støa
Keyword(s):  
Urinary Excretion ◽  
Normal Subjects ◽  
Secretion Rate ◽  
Aldosterone Secretion ◽  
Simple Method ◽  
Mean Values ◽  
Pathological Conditions ◽  
Significant Difference ◽  
Derivative Method ◽  
The Mean

ABSTRACT A comparison has been made between (A), a relatively simple method for the measurement of aldosterone secretion rate, based on paper chromatography and direct densitometry of the aldosterone spot and (B) a more elaborate isotope derivative method. The mean secretion rate in 9 normal subjects was 112 ± 26 μg per 24 hours (method A) and 135 ± 35 μg per 24 hours (method B). The »secretion rate« in one adrenalectomized subject after the intravenous injection of 250 μg of aldosterone was 230 μg per 24 hours (method A) and 294 μg per 24 hours (method B). There was no significant difference in the mean values, and correlation between the two methods was good (r = 0.80). It is concluded that the densitometric method is suitable for clinical purposes as well as research, being more rapid and less expensive than the isotope derivative method. Method A also measures the urinary excretion of the aldosterone 3-oxo-conjugate, which is of interest in many pathological conditions. The densitometric method is obviously the less sensitive and a prerequisite for its use is an aldosterone secretion of 20—30 μg per 24 hours. Lower values are, however, rare in adults.

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