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.

scholarly journals Redefining Knee Balance in a Medially Stabilized Prosthesis: An In-Vitro Study

2017 ◽  
Vol 11 (1) ◽  
pp. 1165-1172
Author(s):  
Philippe Van Overschelde ◽  
Vera Pinskerova ◽  
Peter P. Koch ◽  
Christophe Fornasieri ◽  
Sandro Fucentese
Keyword(s):  
Soft Tissue ◽  
Soft Tissues ◽  
In Vitro Study ◽  
Lateral Release ◽  
Soft Tissue Release ◽  
Iliotibial Band ◽  
Soft Tissue Envelope ◽  
Medial Side ◽  
Fresh Frozen

Background: To date, there is still no consensus on what soft tissues must be preserved and what structures can be safely released during total knee arthroplasty (TKA) with a medially stabilized implant. Objective: The aim of this study was to analyze the effect of a progressive selective release of the medial and lateral soft tissues in a knee implanted with a medially stabilized prosthesis. Method: Six cadaveric fresh-frozen full leg specimens were tested. In each case, kinematic pattern and mediolateral laxity were measured in three stages: firstly, prior to implantation; secondly, after the implantation of the trial components, but before any soft tissue release; and thirdly, progressively as soft tissue was released with the trial implant in place. The incremental impact of each selective release on knee balance was then analyzed. Results: In all cases sagittal stability was not affected by the progressive release of the lateral soft tissue envelope. It was possible to perform progressive lateral release provided the anterior one-third of the iliotibial band (ITB) remained intact. Progressive medial release could be performed on the medial side provided the anterior fibers of the superficial medial collateral ligament (sMCL) remained intact. Conclusion: The medially conforming implant remains stable provided the anterior fibers of sMCL and the anterior fibers of the ITB remain intact. The implant’s sagittal stability is mainly dependent on its medial ball-in-socket design.

scholarly journals In vitro comparison of cone beam computed tomography with different voxel sizes for detection of simulated external root resorption

2012 ◽  
Vol 54 (3) ◽  
pp. 219-225 ◽  
Author(s):  
Frederico S. Neves ◽  
Deborah Q. de Freitas ◽  
Paulo S. F. Campos ◽  
Solange M. de Almeida ◽  
Francisco Haiter-Neto
Keyword(s):  
Computed Tomography ◽  
Cone Beam Computed Tomography ◽  
Root Resorption ◽  
Cone Beam ◽  
External Root Resorption ◽  
In Vitro Comparison

Envelopes of Passive Motion in the Intact Tibiofemoral Joint: An In Vitro Study

2013 ◽  
Author(s):  
Joshua D. Roth ◽  
S. M. Howell ◽  
M. L. Hull
Keyword(s):  
Computational Models ◽  
Soft Tissues ◽  
Surgical Techniques ◽  
Knee Kinematics ◽  
In Vitro Study ◽  
Neutral Position ◽  
Tibiofemoral Joint ◽  
Passive Motion ◽  
Posterior Translation

The kinematics (i.e. passive motions) of the knee are determined and constrained by the articular surfaces and soft tissues of the tibiofemoral joint [1]. Knee kinematics may be characterized by measuring the envelopes of passive motion which are described, for each DOF over a range of flexion, by the positive and negative limits of displacement about a neutral position, under a prescribed load. It is crucial to understand the kinematics of the intact tibiofemoral joint because the envelopes of passive motion could serve as a gold standard for validating computational models of the knee as well as evaluating the effectiveness of innovative and established surgical techniques. Therefore, the objective of this study was to define the envelopes of passive motion for internal-external (I-E) rotation, varus-valgus (V-V) rotation, anterior-posterior translation (A-P), and distraction (D) translation of the intact tibiofemoral joint.

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.

Sign in / Sign up

Export Citation Format

Share Document