scholarly journals Teeth in the Line of Fracture: To Retain or Remove?

2010 ◽  
Vol 3 (4) ◽  
pp. 177-184 ◽  
Author(s):  
Jimson Samson ◽  
Reena John ◽  
Shalini Jayakumar
Keyword(s):  
Fracture Site ◽  
Mandibular Fracture ◽  
Fracture Line ◽  
Panoramic Radiographs ◽  
Fracture Displacement ◽  
Pulp Vitality ◽  
Relationship Of ◽  
The Relationship

The purpose of this study was to analyze mandibular fracture site, relationship of the fracture line to the periodontium, vitality of teeth, displacement of the fracture segments and their implications, and determine whether to retain or remove the teeth in the fracture line. Fifty patients with 62 fractures were involved in this study. An electric pulp tester was used to measure the pulpal response. The degree of fracture displacement and the relationship of the fracture line to the periodontium were evaluated using panoramic radiographs. Fractures of the parasymphysis region constituted a majority of 60.87% in the gross displacement category. Four of 50 patients showed no response presurgically and minimal response postoperatively on pulp vitality testing. Patients with teeth in the fracture line showing no response on pulp vitality testing should be advised extraction to avoid further complications.

Evaluation of the Prognosis of the Teeth in the Mandibular Fracture Line

2020 ◽  
pp. 194338752095267
Author(s):  
Hatice Hosgor ◽  
Fatih Mehmet Coskunses ◽  
Deniz Akin
Keyword(s):  
Survival Rate ◽  
Open Reduction ◽  
Mandibular Fracture ◽  
Fracture Line ◽  
Preventive Approach ◽  
Clinical Records ◽  
Relationship Of ◽  
The Relationship

Objective: The aim of this study was to evaluate the prognosis of the teeth in the mandibular fracture line and to analyze the relationship between the degree of displacement of fracture fragments, the relationship of the fracture line to the periodontium, and the relationship between the condition of the teeth at the first postoperative (post-op) year. Methods: A total of 60 teeth from 38 patients (11 female and 27 male) who had erupted teeth in the line of mandibular fracture and were treated with open reduction were examined. The data were collected from the patients’ clinical records and radiographs. Age at the time of injury, gender, cause of trauma, site of fracture, the relationship of the fracture line to the periodontium, the degree of displacement of fracture fragments, and the condition of the teeth in the line of the fracture at the first post-op year were evaluated. Results: The degree of displacement of fracture fragments had an effect on the condition of the teeth at the first post-op year ( P = .036) and the regions of the mandible had an effect on the degree of displacement of the fracture fragments ( P = .000). The survival rate of the pulp of the teeth was 69.8%. Conclusions: A preventive approach should be preferred for teeth in the mandibular fracture line. Retained teeth in the fracture line should be monitored clinically and radiologically for at least 1 year, and unnecessary endodontic treatments should be avoided.

scholarly journals Radiographic assessment of the quality of dental restorations and their relationship with periodontal radiographic changes

2017 ◽  
Vol 32 (1) ◽  
pp. 17
Author(s):  
João Henrique Parise Fortes ◽  
Felipe Guarda Dallavilla ◽  
Camila Tirapelli ◽  
Plauto Christopher Aranha Watanabe ◽  
Ana Caroline Ramos Brito ◽  
...  
Keyword(s):  
Restorative Material ◽  
Radiographic Assessment ◽  
Periodontal Health ◽  
Panoramic Radiographs ◽  
Dental Restorations ◽  
Relationship Of ◽  
The Relationship ◽  
Radiographic Changes

INTRODUCION: The quality of dental restorations can be directly related to the maintenance of periodontal health. Particularly in relation to the contour of interproximal restorations, radiographs allow the assessment of possible excess or lack of proximal contact of restorative materials.OBJECTIVE: To evaluate the frequency of adequate and inadequate restorations, the type of restorative material and the relationship of these parameters with periodontal alterations.METHODS: One hundred digital panoramic radiographs were evaluated, with interproximal restorations being observed on these examinations, classifying them according to the material used and the quality of interproximal restoration and the presence of periodontal alterations. Thepossible correlation between these parameters was evaluated.RESULTS: The frequency of adequate restorations was 48% of restored proximal surfaces. Among the inadequate restorations, 46.2% and 53.8% were over-contour and lack of proximal contact, respectively. The restorations were metallic in 64% of cases.CONCLUSIONS: Over-contour were more common among metal restorations and lack of proximal contact was more frequent among non-metal restorations. The presence of restorations was associated with increased prevalence of periodontal alterations.

scholarly journals Mandibular Fractures: Pre-Operative Panoramic Radiography and Duplication Sign Patterns

2021 ◽  
Vol 5 (5) ◽  
pp. 57-66
Author(s):  
Oleksandr Nosyr ◽  
Serhii Khrulenko
Keyword(s):  
Cortical Bone ◽  
Management Strategy ◽  
Panoramic Radiography ◽  
Mandibular Fracture ◽  
Fracture Line ◽  
Mandibular Fractures ◽  
Panoramic Radiographs ◽  
Sign Patterns ◽  
Precise Diagnosis ◽  
Mandible Fractures

The purpose of this essay is to present the multiple patterns of the duplication sign at the mandibular fracture line/gap visualized at the panoramic radiography as two-line fracture gap or pseudocomminuted fracture. We retrospectively reviewed the orthopantomography of patients with mandible fractures and presented nine patients with 12 duplication signs (also known as lambda course fracture line). On panoramic radiographs the fracture line/gap with duplication sign is visualized as two-line cortical bone discontinuity with or without dislocation due to the fact that the fracture gap runs asymmetrically on the external and internal cortical plates of the jaw. Knowledge of duplication sign patterns, artifacts is also crucial for the precise diagnosis and choice of correct management strategy.

scholarly journals Positive Predictive Value of Panoramic Radiography for Assessment of the Relationship of Impacted Mandibular Third Molars with the Mandibular Canal Based on Cone-Beam Computed Tomography: A Cross-Sectional Study

Diagnostics ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 1578
Author(s):  
Maryam Tofangchiha ◽  
Soheil Koushaei ◽  
Maryam Mortazavi ◽  
Zahra Souri ◽  
Ahad Alizadeh ◽  
...  
Keyword(s):  
Root Apex ◽  
Mandibular Canal ◽  
Cross Sectional Study ◽  
White Line ◽  
Cross Sectional ◽  
Panoramic Radiographs ◽  
Impacted Mandibular Third Molars ◽  
Mandibular Third Molars ◽  
Relationship Of ◽  
The Relationship

The aim of the present study was to assess the positive predictive value (PPV) of panoramic radiographic signs in the assessment of the relationship between impacted mandibular third molars (IMTMs) and the mandibular canal (MC). This cross-sectional study was conducted by reviewing 102 cone-beam computed tomography (CBCT) and panoramic radiographs of patients with IMTMs and radiographic signs of the contact of the IMTMs with the MC on panoramic radiographs (i.e., root apex darkening and interference with the white line). A positive relationship of the IMTM roots with the MC based on CBCT findings was recorded as the gold standard. The PPV of panoramic radiographic signs was calculated for the detection of the relationship of the IMTM root with the MC. The IMTMs were in contact with the MC on CBCT scans in 90.1% of the cases. The PPV of root apex darkening and the interference with the white line was found to be 89.09% (95% CI: (77.75, 95.88)) and 91.48% (95% CI: (79.62, 97.63)), respectively. The MC had a buccal position in 63.7%, and a lingual position in 35.2%, of the cases. The contact of IMTMs with the MC was more commonly seen in patients with a lingual position (100% of the samples). The IMTM root apex darkening and interference with the white line of the MC on panoramic radiographs had a high PPV for determination of the contact of IMTMs with the MC. Thus, presence of the above-mentioned risk factors indicates the need for subsequent 3D radiographic assessments.

The relationship of the scleractinian corals to the rugose corals

Paleobiology ◽  
1980 ◽  
Vol 6 (02) ◽  
pp. 146-160 ◽  
Author(s):  
William A. Oliver
Keyword(s):  
Critical Points ◽  
Scleractinian Corals ◽  
Convincing Evidence ◽  
Early Triassic ◽  
Rugose Corals ◽  
History Of ◽  
The Subject ◽  
Relationship Of ◽  
The Relationship ◽  
Biologic Factors

The Mesozoic-Cenozoic coral Order Scleractinia has been suggested to have originated or evolved (1) by direct descent from the Paleozoic Order Rugosa or (2) by the development of a skeleton in members of one of the anemone groups that probably have existed throughout Phanerozoic time. In spite of much work on the subject, advocates of the direct descent hypothesis have failed to find convincing evidence of this relationship. Critical points are:(1) Rugosan septal insertion is serial; Scleractinian insertion is cyclic; no intermediate stages have been demonstrated. Apparent intermediates are Scleractinia having bilateral cyclic insertion or teratological Rugosa.(2) There is convincing evidence that the skeletons of many Rugosa were calcitic and none are known to be or to have been aragonitic. In contrast, the skeletons of all living Scleractinia are aragonitic and there is evidence that fossil Scleractinia were aragonitic also. The mineralogic difference is almost certainly due to intrinsic biologic factors.(3) No early Triassic corals of either group are known. This fact is not compelling (by itself) but is important in connection with points 1 and 2, because, given direct descent, both changes took place during this only stage in the history of the two groups in which there are no known corals.

Skeletal elements of crinoid echinoderms: High-resolution structural and microanalytical results

1983 ◽  
Vol 41 ◽  
pp. 194-195
Author(s):  
D. F. Blake ◽  
L. F. Allard ◽  
D. R. Peacor
Keyword(s):  
High Resolution ◽  
Marine Invertebrates ◽  
Sea Urchins ◽  
Structural Features ◽  
Sea Stars ◽  
High Resolution Tem ◽  
Relationship Of ◽  
The Relationship ◽  
Insight Into

Echinodermata is a phylum of marine invertebrates which has been extant since Cambrian time (c.a. 500 m.y. before the present). Modern examples of echinoderms include sea urchins, sea stars, and sea lilies (crinoids). The endoskeletons of echinoderms are composed of plates or ossicles (Fig. 1) which are with few exceptions, porous, single crystals of high-magnesian calcite. Despite their single crystal nature, fracture surfaces do not exhibit the near-perfect {10.4} cleavage characteristic of inorganic calcite. This paradoxical mix of biogenic and inorganic features has prompted much recent work on echinoderm skeletal crystallography. Furthermore, fossil echinoderm hard parts comprise a volumetrically significant portion of some marine limestones sequences. The ultrastructural and microchemical characterization of modern skeletal material should lend insight into: 1). The nature of the biogenic processes involved, for example, the relationship of Mg heterogeneity to morphological and structural features in modern echinoderm material, and 2). The nature of the diagenetic changes undergone by their ancient, fossilized counterparts. In this study, high resolution TEM (HRTEM), high voltage TEM (HVTEM), and STEM microanalysis are used to characterize tha ultrastructural and microchemical composition of skeletal elements of the modern crinoid Neocrinus blakei.

Studies on Leukemogenic and Sarcomagenic Viruses

1970 ◽  
Vol 28 ◽  
pp. 156-157
Author(s):  
Leon Dmochowski
Keyword(s):  
Electron Microscopy ◽  
Electron Microscope ◽  
Morphological Properties ◽  
Mode Of Development ◽  
Relationship Of ◽  
The Relationship

Electron microscopy has proved to be an invaluable discipline in studies on the relationship of viruses to the origin of leukemia, sarcoma, and other types of tumors in animals and man. The successful cell-free transmission of leukemia and sarcoma in mice, rats, hamsters, and cats, interpreted as due to a virus or viruses, was proved to be due to a virus on the basis of electron microscope studies. These studies demonstrated that all the types of neoplasia in animals of the species examined are produced by a virus of certain characteristic morphological properties similar, if not identical, in the mode of development in all types of neoplasia in animals, as shown in Fig. 1.

The relationship of IGE receptor topography to signaling activity in RBL-2H3 mast cells

1991 ◽  
Vol 49 ◽  
pp. 236-237
Author(s):  
J.R. Pfeiffer ◽  
J.C. Seagrave ◽  
C. Wofsy ◽  
J.M. Oliver
Keyword(s):  
Mast Cells ◽  
Protein A ◽  
Scattered Electron ◽  
Ige Receptor ◽  
Receptor Complexes ◽  
Ige Binding ◽  
Electron Imaging ◽  
Small Clusters ◽  
Relationship Of ◽  
The Relationship

In RBL-2H3 rat leukemic mast cells, crosslinking IgE-receptor complexes with anti-IgE antibody leads to degranulation. Receptor crosslinking also stimulates the redistribution of receptors on the cell surface, a process that can be observed by labeling the anti-IgE with 15 nm protein A-gold particles as described in Stump et al. (1989), followed by back-scattered electron imaging (BEI) in the scanning electron microscope. We report that anti-IgE binding stimulates the redistribution of IgE-receptor complexes at 37“C from a dispersed topography (singlets and doublets; S/D) to distributions dominated sequentially by short chains, small clusters and large aggregates of crosslinked receptors. These patterns can be observed (Figure 1), quantified (Figure 2) and analyzed statistically. Cells incubated with 1 μg/ml anti-IgE, a concentration that stimulates maximum net secretion, redistribute receptors as far as chains and small clusters during a 15 min incubation period. At 3 and 10 μg/ml anti-IgE, net secretion is reduced and the majority of receptors redistribute rapidly into clusters and large aggregates.

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