scholarly journals Comparison between Two Radiological Methods for Assessment of Tooth Root Resorption: An In Vitro Study

2018 ◽  
Vol 2018 ◽  
pp. 1-7 ◽  
Author(s):  
Sabina Saccomanno ◽  
Pier Carmine Passarelli ◽  
Bruno Oliva ◽  
Cristina Grippaudo
Keyword(s):  
Root Resorption ◽  
In Vitro Study ◽  
Clinical Settings ◽  
Radiographic Image ◽  
Panoramic Radiographs ◽  
The Real ◽  
Radiological Images ◽  
Digital Methods ◽  
Radiological Methods

Purpose. This study aims to verify the validity of the radiographic image and the most effective radiological techniques for the diagnosis of root resorption to prevent, cure, and reduce it and to verify if radiological images can be helpful in medical and legal situations. Methods. 19 dental elements without root resorption extracted from several patients were examined: endooral and panoramic radiographs were performed, with traditional and digital methods. Then the root of each tooth was dipped into 3-4 mm of 10% nitric acid for 24 hours to simulate the resorption of the root and later submitted again to radiological examinations and measurements using the same criteria and methods. Results. For teeth with root resorption the real measurements and the values obtained with endooral techniques and digital sensors are almost the same, while image values obtained by panoramic radiographs are more distorted than the real ones. Conclusions. Panoramic radiographs are not useful for the diagnosis of root resorption. The endooral examination is, in medical and legal fields, the most valid and objective instrument to detect root resorption. Although the literature suggests that CBCT is a reliable tool in detecting root resorption defects, the increased radiation dosage and expense and the limited availability of CBCT in most clinical settings accentuate the outcome of this study.

scholarly journals Comparison of MTA, CEM Cement, and Biodentine as Coronal Plug during Internal Bleaching: An In Vitro Study

2020 ◽  
Vol 2020 ◽  
pp. 1-8
Author(s):  
Paridokht Zarean ◽  
Parichehr Zarean ◽  
Arash Ravaghi ◽  
Maryam Zare Jahromi ◽  
Mitra Sadrameli
Keyword(s):  
Root Resorption ◽  
Mineral Trioxide Aggregate ◽  
In Vitro Study ◽  
Negative Control ◽  
Vitro Study ◽  
Control Group ◽  
Endodontically Treated Teeth ◽  
Cem Cement ◽  
Significant Difference

Background. Internal bleaching is a choice of treatment in discolored endodontically treated teeth. Cervical root resorption is one of the important complications of this treatment. A suggested procedure to prevent this type of resorption is using a coronal barrier under the bleaching materials. The aim of the study was to compare the microleakage of mineral trioxide aggregate (MTA), calcium-enriched mixture (CEM) cement, and Biodentine. Materials and Methods. In this in vitro study, a total of 60 single canal incisors were included. They were randomly divided into three experimental groups (n = 16), one positive control group (n = 6), and one negative control group (n = 6). Coronal portion of the canals in the experimental groups was sealed with 3 mm of MTA, CEM cement, or Biodentine as a coronal barrier. After 3 days, specimens were bleached. A fresh Enterococcus faecalis suspension was added to the samples. The culture tubes were observed for 45 days, and the daily turbidity was recorded. Statistical analysis was accomplished by the Kaplan–Meier test and SPSS 22. Results. All positive samples showed turbidity, whereas none of the negative samples allowed bacterial leakage. Results showed no significant difference between MTA, CEM cement, and Biodentine groups. ( P value = 0.304, 0.695, and 0.217). The bacterial microleakage for the two groups also did not show significant differences. Conclusions. CEM cement and Biodentine showed promising results as coronal plug, and clinical studies are needed to test these materials with MTA for avoiding microleakage in internal bleaching treatment.

scholarly journals Study of the Distortion of the Indirect Angular Measurements of the Calcaneus Due to Perspective: In Vitro Testing

Sensors ◽  
2021 ◽  
Vol 21 (8) ◽  
pp. 2585
Author(s):  
Isidoro Espinosa-Moyano ◽  
María Reina-Bueno ◽  
Inmaculada C. Palomo-Toucedo ◽  
José Rafael González-López ◽  
José Manuel Castillo-López ◽  
...  
Keyword(s):  
Sagittal Plane ◽  
Frontal Plane ◽  
In Vitro Study ◽  
Body Segment ◽  
The Real ◽  
Foot Progression Angle ◽  
Regression Formula ◽  
Angular Measurements ◽  
Kinematic Analyses

The study of the foot is relevant in kinematic analyses of gait. Images captured through a lens can be subjected to various aberrations or distortions that affect the measurements. An in vitro study was performed with a rearfoot simulator to compare the apparent degrees (photographed) with the real ones (placed in the simulator) in the plane of the rearfoot’s orientation, according to variations in the capture angle in other planes of space (the sagittal plane and transverse plane—the latter determined by the foot progression angle). The following regression formula was calculated to correct the distortion of the image: real frontal plane = 0.045 + (1.014 × apparent frontal plane) − (0.018 × sagittal plane × foot progression angle). Considering the results of this study, and already knowing its angle in the transverse and sagittal planes, it is possible to determine the angle of a simulated calcaneus with respect to the ground in the frontal plane, in spite of distortions caused by perspective and the lack of perpendicularity, by applying the above regression formula. The results show that the angular measurements of a body segment made on frames can produce erroneous data due to the variation in the perspective from which the image is taken. This distortion must be considered when determining the real values of the measurements.

scholarly journals Accuracy of Different Apex Locators in Teeth with Simulated Apical Root Resorption: an In Vitro Study

Folia Medica ◽  
2018 ◽  
Vol 60 (4) ◽  
pp. 624-631
Author(s):  
Ganesh Ranganath Jadhav ◽  
Priya Mittal ◽  
Vishal Patil ◽  
Prashant Kandekar ◽  
Anish Kulkarni ◽  
...  
Keyword(s):  
Root Resorption ◽  
In Vitro Study ◽  
Permanent Teeth ◽  
Fourth Generation ◽  
Apical Root Resorption ◽  
Anterior Teeth ◽  
Group I ◽  
Working Length ◽  
Significant Difference

Abstract Background: Accurate working length (WL) determination is necessary in achieving optimal healing by non-surgical root canal therapy in teeth with inflammatory apical root resorption. Electronic apex locators (EALs) are one of the mainstays in determination of WL of teeth. Aim: This study evaluated the accuracy of three EALs [RootZX (third generation), iPex (fourth generation) and Raypex 6 (modification of a fifth generation)] in determining the WL of teeth with simulated apical root resorption in permanent teeth. Materials and methods: Forty freshly extracted maxillary anterior teeth were collected and a 45° oblique cut was made at the root apex with a disc to simulate apical root resorption. Actual working length (AWL) was determined by direct visual method and was used as a control. Electronic working length (EWL) values were measured by three different apex locators that are RootZX (Group I), iPex (Group II) and Raypex 6 (Group III) at apex, 0.5 mm and 1 mm from apex. All values obtained were tabulated and statistical evaluation was carried out. Results: At apex, EWL obtained using iPex (p=0.05) showed a statistically significant difference from AWL. At 0.5 mm and 1.0 mm tolerance, iPex showed non-acceptability for WL measurement in 67.5% and 17.5% of samples compared to Root ZX (12.5% and 2.5%) and Raypex (7.5% and none) respectively. Conclusion: Within the limitation of this study, it can be concluded that Raypex 6 and RootZX show statistically significant accuracy in WL measurement compared with iPex in teeth with apical root resorption.

scholarly journals Efficacy of conventional and digital radiographic imaging methods for diagnosis of simulated external root resorption

2004 ◽  
Vol 12 (2) ◽  
pp. 108-112 ◽  
Author(s):  
Vânia Portela Ditzel Westphalen ◽  
Ivaldo Gomes de Moraes ◽  
Fernando Henrique Westphalen
Keyword(s):  
Soft Tissues ◽  
Root Resorption ◽  
In Vitro Study ◽  
Digital Method ◽  
Radiographic Imaging ◽  
Steel Cylinder ◽  
External Root Resorption ◽  
Deep Cavities ◽  
Shift Technique

This in vitro study evaluated and compared the efficacy of conventional (Kodak F-speed (Insight), Kodak) and a digital (DRS Gnatus System, Gnatus) radiographic imaging for diagnosis of simulated external root resorption cavities. Human mandibles containing teeth were covered with bovine muscle slices in order to simulate the soft tissues. Nine teeth out of each group of teeth were investigated. Initially, three periapical radiographs of each tooth were taken using a tube shift technique with mesial and distal angulations in both methods. All teeth were subsequently extracted and had 0.7 and 1.0-mm deep cavities prepared on their buccal, mesial and distal surfaces at the cervical, middle and apical thirds. Steel cylinder burs (DORMER® - HSS) with 0.7 and 1.0-mm diameter were used. Each tooth was replaced on its socket and new radiographs were taken. Three examiners, an endodontist (1), a radiologist (2) and a general dentist (3), evaluated the images. Results were compared by z-test and showed a higher number of cavities detected by the digital method compared to the conventional, regardless of the deepness of the cavity. In decreasing order, examiners 2, 3 and 1 exhibited different potentials of detection of cavities with the conventional method. Examiners 1 and 3 exhibited superior potential than examiner 2 for detection of cavities of different sizes with the digital method.

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