Specialty of Concept "Creativity " in Architecture

Architecture is one of the most effective changing methods in society. It's a cultural phenomena that reveal thoughts and believes of its society through its production. That production must have the power to introduce the unique, and which never been known. To achieve that is what could be named "Creativity". The object of this research is concemed with clarif,ing the concept ,,Creativity,, in general, and its specialty in Architecture. The method which have been followed was by: l. Clarifying the concept in philosophy and linguistics theories because of its influence on Architecture. 2. Clarifuing the concept in different theoretical attitudes and strategies that have been used in Architecture. The research concluded that Creativity could be meaning both Revealing and creation. The Revealing would be reached by passed over what have been kaown, and the Creation would be by displacement what has been known

The Effect of Intra-Canal Posts on Diagnostic Accuracy of Cone Beam Computed Tomography and Digital Radiography in Detection of Vertical Root Fractures

Objective: Diagnosis of vertical root fractures (VRFs) is critical in endodontics. Cone Beam Computed Tomography (CBCT) has significantly enhanced image quality compared to digital radiography (DR) and greatly aids the diagnosis of VRFs but, metal artifacts has remained as a problem in VRF detection. This study evaluated the effect of intra canal posts on the diagnostic accuracy of CBCT and DR for detection of VRFs.Methods: In this experimental in vitro study eighty extracted human premolar teeth were cut at the cement-enamel junction .After root canal preparation, the casting posts were made. Samples were randomly divided into 2 groups of 40; group one with induced fracture and group 2 as the control group. Radiographs were taken for all specimens with and without posts with both imaging systems. Three observers assessed the presence or absence of VRF. Accuracy of the two imaging systems and the effect of post on VRF detection were assessed, using two-way ANOVA test and inter observer coefficient agreement was calculated.Results: Absolute diagnostic sensitivity and specificity of CBCT and absolute sensitivity of DR in the group with intracanal posts were significantly lower than those in the group without posts (p=0.023, p=0.034 and p=0.034 respectively). Absolute specificity of DR in the group with posts was significantly higher than that of the CBCT (p=0.014). The absolute and complete specificity of CBCT in the group without posts was significantly higher than those of DR (p=0.024, p=0.04). No statistically significant difference was found in inter observer agreement coefficient in presence or absence of posts or between the two imaging systems (p=0.119).Conclusion: Intra canal posts decreased the diagnostic accuracy of CBCT and DR for detection of VRFs and this reduction was greater in CBCT. However, absolute specificity of DR in the group with posts was significantly higher than that of the CBCT, where as CBCT images of teeth without posts still had higher diagnostic accuracy than DR

A Novel Technique for Minimizing the Metal Artifacts on Anterior Teeth in Cone-Beam Computed Tomography

In endodontics, metal artifacts are the major weak points of employing cone-beam computed tomography (CBCT) in teeth with metallic posts and restorations. The aim of this article is to introduce a novel technique for preparation of beneficial CBCT images of anterior teeth with metal posts and/or crowns. In this novel technique, the patient who was instructed to take CBCT images for reason of implant surgery, was asked to puff out his cheeks/lips during the rotation of x-ray tube. By comparing the image taken with this technique to normal image it was obvious that after applying the cheek puffing technique, the metal artifacts around restored anterior teeth significantly reduced. Then it seems that this novel technique removes the metal artifacts from the crowned teeth to distances far from the tooth structure and enables more accurate diagnosis.Keywords: Artifact; Cone-Beam Computed Tomography; Cone-Beam Computer-Assisted Tomography; Endodontics; Metal Artifact Reductio

Oral Hard Tissue Lesions: A Radiographic Diagnostic Decision Tree

BACKGROUND: Focusing on history taking and an analytical approach to patient’s radiographs, help to narrow the differential diagnoses. AIM: This narrative review article aimed to introduce an updated radiographical diagnostic decision tree for oral hard tissue lesions according to their radiographic features. METHODS: General search engines and specialized databases including PubMed, PubMed Central, Scopus, Embase, EBSCO, ScienceDirect, and authenticated textbooks were used to find relevant topics by means of MeSH keywords such as “jaw diseases,” “maxilla,” “mandible,” “radiolucent,” “radiopaque,” “odontogenic,” “nonodontogenic,” “cysts,” and “tumors.” Related English-language articles published from 1973 to 2020, including reviews, meta-analyses, and original papers (randomized or non-randomized clinical trials; prospective; or retrospective cohort studies), case reports, and case series about oral hard tissue lesions were appraised. RESULTS: In this regard, bony lesions have been classified according to their radiographic pattern (radiolucent, mixed, radiopaque, and rarified), position (periapical, pericoronal and interradicular), margins (well and ill-defined), relation to dentition (with and without dental association), and number (solitary and multiple). In total, 50 entities were organized in the form of a decision tree. CONCLUSION: In this paper, an updated decision tree was proposed to help dental practitioners to make more accurate diagnoses and better treatment plans on the basis of radiographic characteristics

Comparison of CT-Number and Gray Scale Value of Different Dental Materials and Hard Tissues in CT and CBCT

Introduction: Computed tomography (CT) and cone-beam CT (CBCT) are valuable diagnostic aids for many clinical applications. This study was designed to compare the gray scale value (GSV) and Hounsfield unit (HU) of selected dental materials and various hard tissues using CT or CBCT. Methods and Materials: Three samples of all test materials including amalgam (AM), composite resin (CR), glass ionomer (GI), zinc-oxide eugenol (ZOE), calcium-enriched mixture (CEM) cement, AH-26 root canal sealer (AH-26), gutta-percha (GP), Coltosol (Col), Dycal (DL), mineral trioxide aggregate (MTA), zinc phosphate (ZP), and polycarbonate cement (PC) were prepared and scanned together with samples of bone, dentin and enamel using two CBCT devices, Scanora 3D (S3D) and NewTom VGi (NTV) and a spiral CT (SCT) scanner (Somatom Emotion 16 multislice spiral CT);. Subsequently, the HU and GSV values were determined and evaluated. The data were analyzed by the Kruskal-Wallis and Mann-Whitney U tests. The level of significance was determined at 0.05. Results: There were significant differences among the three different scanners (P<0.05). The differences between HU/GSV values of 12 selected dental materials using NTV was significant (P<0.05) and for S3D and SCT was insignificant (P>0.05). All tested materials showed maximum values in S3D and SCT (3094 and 3071, respectively); however, bone and dentin showed low/medium values (P<0.05). In contrast, the tested materials and tissues showed a range of values in NTV (366 to15383; P<0.05). Conclusion: Scanner system can influence the obtained HU/GSV of dental materials. NTV can discriminate various dental materials, in contrast to S3D/SCT scanners. NTV may be a more useful diagnostic aid for clinical practice

Prevalence of idiopathic osteosclerosis on cone beam computed tomography images

Objectives This study was performed to investigate the prevalence of idiopathic osteosclerosis on cone beam computed tomography (CBCT) images of patients.Methods In this descriptive, cross-sectional study, 240 CBCT scans of patients (125 women, 115 men) referred to a private oral and maxillofacial radiology clinic in Tehran in 2013 were selected and evaluated. Presence of idiopathic osteosclerosis and its features including its location in the jaw, its association with teeth, presence or absence of root resorption, number, shape and size of lesions and age and gender of patients were assessed. Descriptive statistics were reported. Chi-square test and independent t-test were used for statistical analysis.Results Idiopathic osteosclerosis was seen on CBCT images of 20 patients (8.33%). The lesion was more frequent in women than men, but the difference was not significant (P = 0.50). Also, the lesion was more common in the mandible than the maxilla (95.6% vs. 4.4%). Most lesions were observed in the molar (56.5%) and premolar (34.7%) areas of the lower jaw. Most lesions did not have any association with teeth (73.9%). More than half of the lesions (56.5%) were round in shape and the rest (43.4%) were irregular. The mean size of the lesions was 5.4 ± 1.8 and 5.7 ± 1.4 mm in the mesiodistal and superior-inferior aspects, respectively.Conclusion The prevalence of idiopathic osteosclerosis of the jaws on CBCT images of an Iranian population was within the range reported by other studies. The lesions were more common in the mandibular molar region with no relation to teeth

Survey of Anatomy and Root Canal Morphology of Maxillary First Molars Regarding Age and Gender in an Iranian Population Using Cone-Beam Computed Tomography

Introduction: The purpose of this study was to investigate the root and canal morphology of maxillary first molars with regards to patients’ age and gender with cone-beam computed tomography (CBCT). Methods and Materials: A total of 149 CBCT scans from 92 (67.1%) female and 57 (31.3%) male patients with mean age of 40.5 years were evaluated. Tooth length, presence of root fusion, number of the roots and canals, canal types based on Vertucci’s classification, deviation of root and apical foramen in coronal and sagittal planes and the correlation of all items with gender and age were recorded. The Mann Whitney U, Kruskal Wallis and Fisher’s exact tests were used to analyze these items. Results: The rate of root fusion was 1.3%. Multiple canals were present in the following frequencies: four canals 78.5%, five canals 11.4% and three canals 10.1%. Additional canal was detected in 86.6% of mesiobuccal roots in which Vertucci’s type VI configuration was the most prevalent followed by type II and I. Type I was the most common one in distobuccal and palatal roots. There was no statistically significant difference in the canal configurations in relation to gender and age as well as the incidence root or canal numbers (P>0.05). The mean tooth length was 19.3 and 20.3 mm in female and male patients, respectively which was statistically significant (P<0.05). Evaluation of root deviation showed that most commonly, a general pattern of straight-distal in the mesiobuccal and straight-straight for distobuccal and palatal roots occurred. In mesiobuccal roots, straight and distal deviations were more dominant in male and female, respectively (P<0.05). The prevalence of apical foramen deviation in mesiobuccal and palatal roots statistically differed with gender. Conclusion: The root and canal configuration of Iranian population showed different features from those of other populations.Keywords: Age; Cone-Beam Computed Tomography; Gender; Maxillary Molar; Root Canal Morphology; Tooth Anatomy

Evaluation of Posterior Superior Alveolar Canal on Cone Beam Computed Tomography Images

Objectives The posterior superior alveolar artery (PSAA) is one of the branches of the maxillary artery that is located on the lateral wall of the maxillary sinus. The aim of the present study was to evaluate the detectability, position, and diameter of the posterior superior alveolar (PSA) canal and its relationship with the alveolar ridge using cone-beam computed tomography (CBCT).Methods A total of 257 CBCT images were evaluated. The PSA canal location was categorized into three forms of intra-osseous, below the membrane, and on the outer cortex of the lateral sinus wall. The distance between the lower border of the artery and the alveolar crest, the distance between the artery and the medial wall of the sinus, and the diameter of the artery were all measured. The prevalence of sinusitis and mucous retention cyst was also determined. The Chi-square test and independent t-test were used for statistical analysis.Results The most common type of PSA canal was intra-osseous, followed by beneath the mucosal membrane and on the outer cortex of the lateral sinus wall. The lowest distance between the PSA canal and medial sinus wall and ridge crest, and canal diameter were higher in males (P<0.05). In addition, sinus pathologies were significantly more common in males than females (P<0.05).Conclusion The most common type of PSA canal was intra-osseous, and the distances between the lower border of the canal and the alveolar crest and ridge height decreased with aging; thus, it should be considered during implant surgery

Effect of Amperage and Field of View on Detection of Vertical Root Fracture in Teeth with Intracanal Posts

Introduction: This study sought to assess the effects of amperage (mA) and field of view (FOV) on intracanal metal post artifacts and the diagnostic parameters for detection of vertical root fracture (VRF) in teeth with intracanal posts. Methods and Materials: In this diagnostic study, 80 human single-canal teeth were evaluated by cone-beam computed tomography (CBCT). Nickel chrome cast posts were placed into root canals after root canal therapy and canal preparation. In the test group, fracture was induced by an instron machine while no fracture was induced in the control group. Deterministic and probabilistic sensitivity and specificity values at different exposure settings were statistically analyzed using the one-way ANOVA and pairwise comparisons were performed by Tukey’s test. Results: Significant differences were found between the two groups in terms of deterministic (P<0.0001) and probabilistic (P<0.013) sensitivity and deterministic (P<0.037) and probabilistic (P<0.0001) specificity at different FOV and mA combinations. Conclusion: A smaller FOV and lower mA should be preferably used for detection of VRFs in teeth with intracanal posts.Keywords: Amperage; Cone-Beam Computed Tomography; Field of View; Metal Artifact; Vertical Root Fractur