[Prevalance of infraorbital ethmoid [Haller's] air cell on CT image in patients over 6 years of age]

Infraorbital ethmoid air cells are extensions of anterior ethmoid sinus into the floor of the orbit and superior aspect of the maxillary sinus. Such anatomical variations may result sinusitis, mucocele, retention cyst and headache. CT scan is commonly used for imaging infraorbital ethmoid cells. The aim of present study was: To determine the prevalence of infraorbital ethmoid cells on CT Image in patients over 6 years of age. In this descriptive analytic study, 190 CT Cronal Images [91 women and 99 men] were examined for infraorbital ethmoid cells and their characteristics Other data such as age, sex, involved side, history or symptom of sinusitis, and sinus disorder were recordedusing a questionnaire Data analysis were done in spss statistical softwere by chi-squre test. Prevalance of infraorbital ethmoid [haller's] cells on CT Image in patients older than 6 years were 11. 6% [12.1% for men and 11% for women]. There was no statistically significant difference between men and women. The most frequency related to patient who were between 41-50 years old [24.1%] and the least frequent age was in patient under 20 years [0%]. Unilateral involvements [9.5%] were more than bilateral form [2.1%] and there was statistically significant difference between right and left sides. two patients [9.1%] with haller cells were multilocular, and 20 patients [90.9%] with haller cells were unilocularview. There was a satistically significant difference in haller's cell frequency between different shapes. ten patients [45.5%] with haller cells had history or symptoms of sinusitis and 3 patients [13.6%] with haller cells had retention cyst in CT Image. sixteen Patients [72.7%] with haller cells had narrowing of Infandibuloum on CT Images. According to the result of this study and the prevalence of infraorbital ethmoid cells on CT Image, Identification of these cells can help the dental professional, to diagnoses orofacial pain with origin of sinus

[Prediction of maxillary canine impaction with panoramic radiographs]

The incidence of maxillary canine impaction is between 1% and 3% populations. Determining whether impaction will occur and timing the treatment modalities that are affected by impacted canine [s] are paramount for a successful out come, panoramic radiograph to identify canine impaction; not only is economical but treatment result will be more desirable. The aim of this investigation was to develop a reliable method for predictors of maxillary canine impaction on a panoramic radiograph. Sixty - four panoramic radiographs of mixed dentition patients were inspected to belong to two groups of patient with impacted and not impacted canines. 88 were found with no impaction and 40 with impacted canines. For predicting canine impaction panoramic radiographs were inspected for two indices: 1- The erupted lateral tooth were divided to fourfold zone from 4 to 1 sectors in mesiodistal dimension; therefore identified the unerupted permanent canines cusp tip location related to the erupted permanent lateral. 2-The internal angle between the long axis of the unerupted canine and a horizontal line between superior points of condyles was measured. The data were analyzed by descriptive statistics and logistic regression. All of not impacted teeth were found in sector I and II. [69.3% in sector I and 30.7% were placed in sector II]. 17.5% of impacted teeth were in sector I, 42.5% in sector II, 27.5% in sector Ill and 12.5% were placed in sector IV. Furthermore the mean angle for non impacted teeth was 74.72' and for impacted teeth was 67.12'. The location of canine cusp tip in panoramic radiograph is the most important factor in predicting probable impaction, but often, the angle of canine is not worth

Relative frequency of sinusitis features in waters' radiographs of under 12 years old children referring to Isfahan city clinics

The maxillary sinuses are the first sinuses form in the embryonic period and begin to be pneumatized from 4 th year of life. Sinusitis is a common disease in children and its on-time diagnosis and treatment is very important to prevent relevant side effects. Unfortunately, in some medical centers Waters' radiography is routinely prescribed for the diagnosis of sinusitis, regardless of the trend of sinuses evolution in children. The aim of this study was to evaluate the efficacy of Waters' radiography in diagnosis of children's sinusitis. This study was an observational, cross- sectional, and retrospective study. The samples included 180 of 0-12 years old children with sinusitis who had referred to Isfahan city clinics and the physicians had prescribed Waters' radiography for them. Required information was gathered via examination and enquiry into the patients' records. The radiographs were blindly surveyed by two radiologists [an oral and a general radiologist] and the data were statistically analyzed using the Chi-square and Kruskal - Wallis statistical tests. The coefficient of agreement between clinical signs and Waters' radiographic features in the samples was 52%.The greatest frequency rate of non - pneumatized sinuses was reported in the group of 3-years-olds and under. 30% of the maxillary sinuses were found to be normal in radiography [P=0.0005]. No difference was observed between sinusitis radiographic results, based on the time of involvement [P=0.219] and sex [P=0.546].Cough [%89.4] and nasal purulent excretions [%53.2] were the most common clinical symptoms of sinusitis. However, clinical signs in 2 groups of with positive radiographic results and with normal sinuses showed no statistically significant difference [0.11

Comparison of disinfectant efficacy of micro 10, sodium hypochlorite, betadine and savlon on the equipment ofradiology department, school of dentistry, Isfahan universityof medical science

Cross infection control is a great concern to which great attention should thus be paid. Infection control protocols in dental radiology are employed to reduce the potential for infectious disease transmission. The areas relevant to the exposure and processing of dental radiographs are not routinely associated with the spatter of blood or saliva; however, infectious disease transmission is still possible if we use contaminated equipment, supplies, film pockets or cassettes. This study aims at comparing the disinfectant efficacy of micro 10, sodium hypochlorite, betadine and savlon on the equipment of the radiology department. Foreach solution, sampling was performed, before disinfection, on 27 sections of the radiology department. Experimental surfaces were then disinfected by the spray-wipe-spray method followed by resembling. The samples were subsequently cultured on bloody agar plates and the colonies were counted. The results of this research showed that the mean rank of turbidity degrees of culture media are respectively 76.74, 68.96, 59.48, 68.96 and 65.85 before disinfection with sodium hypochlorite, betadine, savlon, micro 10 and normal saline. They are respectively 60.74, 50.91, 67.06, 49.37 and 111.93 after disinfection. The results of Kruskal-Wallis test showed that there is a significant difference between the turbidity degrees of culture media after disinfection with the five solutions [Pv<0.001]. Mann-Whitney test also revealed that the efficacy of each of the 4 disinfectant solutions is significantly different from that of the witness solution.[PV<0.001].Regarding the results of this research, micro 10 has the highest disinfectant efficacy as compared with other solutions. Betadine, sodium hypochlorite and savlon are respectively other high efficacy disinfectants. So, regarding micro 10 high efficacy [81.50%], it can be used to establish a disinfected and reliable environment for the radiological personnel and patients with the observance of sufficient contact time and viscosity

Use of cross-sectional tomography for the localization of impacted mandibular 3[rd] molar in relation to inferior alveolar canal

Extraction of mandibular third molar is one of the routine surgical procedures in dentistry. Disestesia because of damage to sensory bundles of inferior-alveolar nerve is one of the complications which may happen following this surgery. Panoramic radiograph is the method which, most of the dentists commonly apply for the assessment of the relationship between the tooth and canal. However, this technique can show a two dimensional view of the site. In this study we compared tomography which showed the third dimension with, panoramic in determining the position of the tooth relative to canal. Sixty tomographs and panoramic radiographs of 60 impacted mandibular 3rd molar of patients being 25 years old or more were evaluated. The mean of the vertical distance of the tooth apex to superior border of mandibular canal was measured in both radiographs and then means were compared together. The mean of horizontal distance was measured in tomographs compared with zero in panoramic. Buccolingual location of the canal relative to the tooth was determined in tomographs. The mean of vertical distance in tomographys and panoramic views was 2.7 mm and 1.1 mm respectively. Both of the differences were significant. About 39% of canals were buccal, 19.5% were lingual and 41.5% were inferior to the tooth. The difference between panoramic radiography and tomography in determining the vertical distance of the tooth apex to superior border of mandibular canal was significant. Tomography can show buccolingual relationship of the canal relative to the tooth and distinguish the roots superimposed on canal that seem tangent from real tangent roots