scholarly journals Efeito da Microcirculação Pulpar Simulada e Fontes Fotoativadoras na Geração de Calor na Câmara Pulpar Durante Restaurações Bulk Fill

2018 ◽  
Vol 19 (5) ◽  
pp. 141
Author(s):  
L R S O Schliebe ◽  
M T H Ribeiro ◽  
A B F Vilela ◽  
R B Price ◽  
C J Soares
Keyword(s):  
Dental Pulp ◽  
Pulp Cavity ◽  
Dental Pulp Cavity

Avaliou-se o efeito da fonte de luz e microcirculação pulpar (MP) simulada na geração de calor na câmara pulpar (CP) sob restaurações de resina composta inseridas em incremento único. Duas fontes de luz multi espectros (Bluephase G2, Ivoclar e VALO Cordless, Ultradent) foram caracterizadas com MARC-Resin Calibrator (BlueLight), a potência radiante com medidor de potência de laboratório e grau de conversão (GC) foi avaliado, utilizando FTIR. 40 molares humanos tiveram a coroa seccionada gerando preparo oclusal plano com 2 mm de dentina. Restaurações foram feitas com sistema adesivo auto-condicionante (Clearfil SE Bond, Kuraray) e resina composta bulk fill fluida (SDR, Dentsply) ou regular (AURA, SDI). A temperatura na CP foi medida com termopar tipo-J, na presença ou ausência de MP. Os dados foram analisados com ANOVA e teste Tukey (a0,05). A irradiância e a potência sofreram atenuação significativa com 3 mm de resina composta sobre os 2 mm de dentina remanescente. Bluephase obteve maior irradiância e potência que o VALO. As resinas e fontes de luz avaliadas influenciaram o GC, porém com valores que confirmam adequada polimerização. Simulação da MP reduziu o aumento de temperatura na CP. Maior aumento de temperatura ocorreu na fotoativação do adesivo. As fontes de luz foram diferentes com o VALO resultando em menor variação de temperatura na ativação do adesivo apenas na ausência de MP. SDR permitiu maior transmissão de luz e alcançou maior GC que AURA. O ponto crítico de temperatura foi na fotoativação do sistema adesivo, sendo que a presença de MP minimiza estes efeitos.Palavras-chave: Temperature. Dental Pulp Cavity. Adhesives.

scholarly journals Narrowing of the Dental Pulp Cavity in Patients Undergoing Long-Term Administration of Steroids.

2001 ◽  
Vol 68 (4) ◽  
pp. 294-299 ◽  
Author(s):  
Osamu Shinozuka ◽  
Goro Sekiguchi ◽  
Yasuka Tamamori ◽  
Minoru Inada ◽  
Tsuneyoshi Yamazaki ◽  
...  
Keyword(s):  
Dental Pulp ◽  
Pulp Cavity ◽  
Term Administration ◽  
Dental Pulp Cavity

scholarly journals Evaluation of secondary dentin formation for forensic age assessment by means of semi-automatic segmented ultrahigh field 9.4 T UTE MRI datasets

2020 ◽  
Vol 134 (6) ◽  
pp. 2283-2288
Author(s):  
Maximilian Timme ◽  
Jens Borkert ◽  
Nina Nagelmann ◽  
Andreas Schmeling
Keyword(s):  
Dental Pulp ◽  
Automatic Segmentation ◽  
Tooth Pulp ◽  
Human Teeth ◽  
Age Assessment ◽  
Ultrahigh Field ◽  
Tooth Structure ◽  
Pulp Cavity ◽  
Magnetic Resonance Imaging Mri ◽  
Dentin Formation

Abstract Dental methods are an important element of forensic age assessment of living persons. After the development of all the teeth, including third molars, is completed, degenerative characteristics can be used to assess age. The radiologically detectable reduction of the dental pulp cavity has been described as such a feature. We investigated the suitability of ultrahigh field 9.4 T ultrashort time echo (UTE) magnetic resonance imaging (MRI) for the evaluation of pulp cavity volume in relation to the total tooth volume in 4 extracted human teeth. The volume calculations were performed after semi-automatic segmentation by software AMIRA using the different intensities of the structures in the MRI dataset. The automatically selected intensity range was adjusted manually to the structures. The visual distinction of pulp and tooth structure was possible in all cases with in-plane resolution < 70 μm. Ratios of tooth/pulp volume were calculated, which could be suitable for age estimation procedures. Intensity shifts within the pulp were not always correctly assigned by the software in the course of segmentation. 9.4 T UTE-MRI technology is a forward-looking, radiation-free procedure that allows the volume of the dental pulp to be determined at high spatial resolution and is thus potentially a valuable instrument for the age assessment of living persons.

scholarly journals Prevalence and Configuration of C-shaped Canals in Lower Molars from a Chilean Subpopulation

2021 ◽  
Vol 24 (4) ◽  
Author(s):  
Fernando Peña Bengoa ◽  
Carlos Ibañez ◽  
Paula Ericles ◽  
Patricio Meléndez ◽  
Carolina Cáceres
Keyword(s):  
Computed Tomography ◽  
Cone Beam Computed Tomography ◽  
Root Canal ◽  
Dental Pulp ◽  
Demographic Characteristics ◽  
High Rate ◽  
Cone Beam ◽  
Significance Level ◽  
Dental Pulp Cavity ◽  
Cone Beam Tomography

Objective: To determine the prevalence of C-shaped canals in lower molars (first and second molars) in a Chilean subpopulation, and to identify root configuration and demographic characteristics using cone beam tomography. Materials and method: 912 molars (456 first and 456 second molars) resulting from the analysis of 228 mandibular CBCT scans (89 men and 139 women between 15 and 80 years old) were evaluated. Through panoramic reconstruction and axial tomographic sections, the root configuration was established, and the presence and type of C-shaped canal were classified, analyzing 5 levels along the root canal. Data were statistically analyzed with a 5% significance level. Results: Of the 912 molars analyzed, 69 were classified as C-shaped (7.57%), constituting 65.72% of those molars that presented fused roots. 100% of this configuration of canals was observed in lower second molars, presenting a higher prevalence in women (n = 49, 71.01%). 40.82% of the cases that presented a C-shaped configuration manifested bilaterally. The most frequent C-shaped canal configuration was C3 (n = 347, 66.10%), according to Melton's classification. Conclusion: The C-shaped canals in the studied population were observed entirely in lower second molars, showing a clear predilection for the female sex and a high rate of bilaterality.   Keywords  Anatomy; Cone beam computed tomography; Dental pulp cavity; Endodontics.

Refined tooth and pulp segmentation using U-Net in CBCT image

2021 ◽  
pp. 20200251
Author(s):  
Wei Duan ◽  
Yufei Chen ◽  
Qi Zhang ◽  
Xiang Lin ◽  
Xiaoyu Yang
Keyword(s):  
Deep Learning ◽  
Dental Pulp ◽  
Small Data ◽  
Two Phase ◽  
Valuable Data ◽  
Pulp Cavity ◽  
Structural Problems ◽  
Single Tooth ◽  
Cbct Image ◽  
Feature Pyramid

Objectives The aim of this study was extracting any single tooth from a CBCT scan and performing tooth and pulp cavity segmentation to visualize and to have knowledge of internal anatomy relationships before undertaking endodontic therapy. Methods: We propose a two-phase deep learning solution for accurate tooth and pulp cavity segmentation. First, the single tooth bounding box is extracted automatically for both single-rooted tooth (ST) and multirooted tooth (MT). It is achieved by using the Region Proposal Network (RPN) with Feature Pyramid Network (FPN) method from the perspective of panorama. Second, U-Net model is iteratively performed for refined tooth and pulp segmentation against two types of tooth ST and MT, respectively. In light of rough data and annotation problems for dental pulp, we design a loss function with a smoothness penalty in the network. Furthermore, the multi-view data enhancement is proposed to solve the small data challenge and morphology structural problems. Results: The experimental results show that the proposed method can obtain an average dice 95.7% for ST, 96.2% for MT and 88.6% for pulp of ST, 87.6% for pulp of MT. Conclusions This study proposed a two-phase deep learning solution for fast and accurately extracting any single tooth from a CBCT scan and performing accurate tooth and pulp cavity segmentation. The 3D reconstruction results can completely show the morphology of teeth and pulps, it also provides valuable data for further research and clinical practice.

scholarly journals Age-dependent decrease in dental pulp cavity volume as a feature for age assessment: a comparative in vitro study using 9.4-T UTE-MRI and CBCT 3D imaging

2021 ◽  
Author(s):  
Maximilian Timme ◽  
Jens Borkert ◽  
Nina Nagelmann ◽  
Adam Streeter ◽  
André Karch ◽  
...  
Keyword(s):  
Dental Pulp ◽  
Specific Reference ◽  
Good Reliability ◽  
Human Teeth ◽  
Age Assessment ◽  
Ultrashort Echo Time ◽  
Pulp Cavity ◽  
The Mean

AbstractEvaluation of secondary dentin formation is generally suitable for age assessment. We investigated the potential of modern magnetic resonance imaging (MRI) technology to visualize the dental pulp in direct comparison with cone beam computed tomography (CBCT). To this end, we examined 32 extracted human teeth (teeth 11–48 [FDI]) using 9.4-T ultrashort echo time (UTE)-MRI and CBCT (methods). 3D reconstruction was performed via both manual and semi-automatic segmentation (settings) for both methods in two runs by one examiner. Nine teeth were also examined by a second examiner. We evaluated the agreement between examiners, scan methods, and settings. CBCT was able to determine the pulp volume for all teeth. This was not possible for two teeth on MRI due to MRI artifacts. The mean pulp volume estimated by CBCT was consistently higher (~ 43%) with greater variability. With lower variability in its measurements, evaluation of pulp volume using the MRI method exhibited greater sensitivity to differences between settings (p = 0.016) and between examiners (p = 0.009). The interactions of single-rooted teeth and multi-rooted teeth and method or setting were not found to be significant. For examiner agreement, the mean pulp volumes were similar with overlapping measurements (ICC > 0.995). Suitable for use in age assessment is 9.4-T UTE-MRI with good reliability and lower variation than CBCT. For MRI, manual segmentation is necessary due to a more detailed representation of the interior of the pulp cavity. Since determination of pulp volume is expected to be systematically larger using CBCT, method-specific reference values are indispensable for practical age assessment procedures. The results should be verified under in vivo conditions in the future.

Detection and Assessment of Interleukin 6 in Irreversible Pulp Inflamation

2017 ◽  
Vol 68 (2) ◽  
pp. 323-327
Author(s):  
Cristian Levente Giuroiu ◽  
Maria Vataman ◽  
Gabriel Melian ◽  
Dragos Bularda ◽  
Ludmila Lozneanu ◽  
...  
Keyword(s):  
Dental Caries ◽  
Interleukin 6 ◽  
Dental Pulp ◽  
The Other ◽  
Control Group ◽  
Study Group ◽  
Pulp Tissue ◽  
Immunohistochemical Technique ◽  
Systemic Distribution ◽  
Cell Zone

The study aimed to assess the number, localization and distribution of interleukin 6 (IL-6) positive cells in healthy pulp, acute and chronic pulpitis. The study group included 48 patients aged between 18-72, treated in University of Medicine and Pharmacy Grigore T. Popa Iasi, Romania. The pulpectomy was performed on 42 patients diagnosed with acute and chronic pulpitis. The other 6 patients, without signs of dental caries or periodontal disease, were submitted to extractions of teeth for orthodontic purposes, with pulpectomy performed before extraction. The pulp samples were examined with optic microscope. The detection and assessment of IL-6 were performed using immunohistochemical technique. Data were statistically analysed using non-parametric tests. According to morphopathological criteria, 42.85% were classified as acute pulpitis and 57.14% as chronic pulpitis. The pulp samples in control group were not associated with IL-6 positive cells. The analysis of all samples with acute and chronic pulpitis identified 73.80% samples with IL-6 and 26.20% associated with the absence of IL-6. The highest frequency of IL-6 positive cells was recorded in rich-cell zone of crown dental pulp. The systemic distribution of IL-6 positive cells was mostly diffused without well-defined orientation. IL-6 release in acute and chronic pulpitis is significantly higher comparing with healthy pulp tissue.

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