Coágulo sanguíneo: uma opção NÃO viável para a preservação alveolar

2021 ◽  
Vol 12 (46) ◽  
pp. 24-31
Author(s):  
Renata Silveira Sagnori ◽  
Bruno Costa Martins de Sá ◽  
Claudio Ferreira Nóia
Keyword(s):  
Computed Tomography ◽  
Statistical Analysis ◽  
Dental Implants ◽  
Pearson Correlation ◽  
Cone Beam ◽  
Alveolar Process ◽  
Significance Level ◽  
Dimensional Changes ◽  
Pearson Correlation Test ◽  
Natural Healing

The loss of dental elements leads to an intense remodeling of the alveolar process, resulting in important dimensional changes, which often make it difficult to install dental implants. Considering this, the objective of the present study was to evaluate the changes in height and thickness that occurred in dental alveoli after extraction. For this, 10 patients were evaluated and submitted to extraction of dental elements and followed up in the postoperative period in which there was natural healing. Cone beam computed tomography were obtained preoperatively and 3 months postoperatively and were used as a basis for assessing loss of height and thickness that occurred. Pearson correlation test with a significance level of 5% was used to assess dimensional changes. The results showed that vertical loss (average of 2.99 mm) was greater than the horizontal loss (average of 2.52 mm). The statistical analysis pointed out the existence of a very good and significant correlation between these bone losses and also revealed that the higher the loss of height, the greater the loss of thickness. In 8 of 10 patients in the sample, some grafting was necessary prior to the installation of the implants, thus increasing morbidity and time of treatment. Considering this, it was concluded that the clot was not a viable alternative for alveolar preservation aiming posterior installation of dental implants.

scholarly journals Comparison of the Hounsfield Unit Values Obtained From Cone-Beam Computed Tomography (CBCT) and Multidetector Computed Tomography (MDCT) Images for Different Bone Densities

2021 ◽  
Vol 7 (2) ◽  
Author(s):  
Atefeh Khavid ◽  
Mojgan Sametzadeh ◽  
Mostafa Godiny ◽  
Mohammad Mehdi Moarrefpour
Keyword(s):  
Computed Tomography ◽  
Cone Beam Computed Tomography ◽  
Pearson Correlation ◽  
Hounsfield Unit ◽  
Cone Beam ◽  
Ct Scanner ◽  
Significance Level ◽  
Dental Practitioners ◽  
Significant Difference ◽  
The Mean

Background and objective: In recent years, cone-beam computed tomography (CBCT) has become a key diagnostic tool in dentistry. CBCT can provide 3D images of the maxillofacial area to help dental practitioners in diagnosis and treatment, especially implant placement and treatment of pathogenic lesions. This study aimed to compare the Hounsfield Unit (HU) values obtained from CBCT images for bones of different densities with the corresponding HU values from MDCT images. Materials and methods: cube-shaped bone blocks of identical size were cut from the middle section of the cow ribs and femur area such that they had a layer of cortical bone in their buccal, lingual, and top surfaces and trabecular bone in the middle. MDCT scans were performed using a Somatom Sensation Ct Scanner. After determining HU from the results of these scans, nine suitable specimens from different ranges of HU were chosen for comparison. HU of the CBCT images was computed by the dedicated software of the CBCT machine. Finally, HU values obtained from MDCT and CBCT were compared. Data analysis was performed using SPSS version 25 at the 0.05 significance level. Results: The results showed a statistically significant difference between the mean HU from MDCT images and the mean HU from CBCT images (P<0.05). For similar specimens, CBCT produced higher mean HU values than MDCT. The Pearson correlation test detected a significant direct relationship between the HU values of specimens in MDCT and CBCT (P<0.05). Conclusion: For the tools and software used in this study, there was no significant difference between the HU values obtained from MDCT and CBCT, but the mean HU obtained from CBCT was higher than that from MDCT.

scholarly journals Location of the Mandibular Canal and Thickness of the Occlusal Cortical Bone at Dental Implant Sites in the Lower Second Premolar and First Molar

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Jui-Ting Hsu ◽  
Heng-Li Huang ◽  
Lih-Jyh Fuh ◽  
Rou-Wei Li ◽  
Jay Wu ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Statistical Analysis ◽  
Cortical Bone ◽  
Dental Implants ◽  
Dental Implant ◽  
Cone Beam Computed Tomography ◽  
Statistical Difference ◽  
Mandibular Canal ◽  
Careful Consideration ◽  
Cone Beam

The objective of this study was to evaluate the location of the mandibular canal and the thickness of the occlusal cortical bone at dental implant sites in the lower second premolar and lower first molar by using dental cone-beam computed tomography (CBCT). Seventy-nine sites (47 second premolar and 32 first molar sites) were identified in the dental CBCT examinations of 47 patients. In this study, 4 parameters were measured: (1) MC—the distance from the mandibular canal to the upper border of the mandible; (2) CD—the distance from the mandibular canal to the buccal border of the mandible; (3) MD—the distance from the mandibular canal to the lingual border of the mandible; (4) TC—the thickness of the cortical bone at the occlusal side. A statistical analysis was employed to compare the size and differences between these 4 parameters at the lower second premolar and lower first molar. Regarding the MC and MD, the experimental results showed no statistical difference between the first molar and second premolar. However, the TC for the second premolar was greater than that of the first molar. Thus, careful consideration is necessary in choosing the size of and operation type for dental implants.

scholarly journals Are metric parameters sufficient alone in evaluation of the patellar instability? New angular measuring parameters

2017 ◽  
Vol 25 (1) ◽  
pp. 230949901668449 ◽  
Author(s):  
Alper Deveci ◽  
Deniz Cankaya ◽  
Serdar Yilmaz ◽  
Ersin Celen ◽  
Bulent Sakman ◽  
...  
Keyword(s):  
Statistical Analysis ◽  
Strong Correlation ◽  
Patellar Instability ◽  
Pearson Correlation ◽  
Trochlear Groove ◽  
Rotational Movement ◽  
Pearson Correlation Test ◽  
Angular Measuring ◽  
Metric Measurement ◽  
Tibia Shaft

Purposes: When the evaluation of patellar instability is examined from the aspect of the conical-cylindrical anatomy of the tibia, metric measurement parameters such as the tuberositas tibia (TT)–trochlear groove (TG) and patellar tendon (PT) insertion–trochlear groove (TG) distances are not sufficient. We asked whether defined angular parameters reveal the rotational movement of the tuberositas tibia on the tibia shaft, additional to the metric parameters and there is a correlation between the metric and angular parameters. Methods: 19 patients with patellar instability and 22 patients without patellar instability were evaluated. For all patients, two angle and three length parameters were evaluated on the slices taken. Evaluations were made of the TT-TG, the midpoint of the PT insertion-TG distances, the anatomic midpoint of the dome of the TT-TG, the TG-PT angle, and the TG-dome angle (DA). The Pearson correlation test was used for the statistical analysis of correlations between groups. Results: A statistically significant increase was determined in the patellar instability group in the TG-DA and TG-PT angle values compared to the group without patellar instability ( p < 0.05). In both groups, a positive and strong correlation was determined between the TT-TG and the TG-PT and dome of the TT-TG distances, but no statistically significant correlation was determined between the tuberositas TT-TG and TG-PT angle and TG-DA. Conclusion: Metric parameters may not be sufficient alone in the evaluation of patellar instability. Metric parameters should be supported by additional angular parameters which reveal the rotational movement of the TT on the tibia shaft.

THE INFLUENCE OF STUDENTS LEARNING STYLE AND LEARNING INTEREST ON THE LEARNING OUTCOMES OF PHYSICS CLASS X IPA DURING THE COVID-19 PANDEMIC

2021 ◽  
Vol 9 (3) ◽  
pp. 132-143
Author(s):  
Albert Lumbu ◽  
Bonefasius Y Boy ◽  
Muhamad Akbar
Keyword(s):  
Learning Styles ◽  
Learning Outcomes ◽  
Learning Style ◽  
Significant Influence ◽  
Pearson Correlation ◽  
Physics Learning ◽  
Significance Level ◽  
Pearson Correlation Test ◽  
Learning Interest ◽  
Learning Together

This study aims to determine whether there are: 1) the influence of learning styles on physics learning outcomes, 2) the influence of interest in learning on physics learning outcomes, 3) the influence of learning styles and interest in learning together on physics learning outcomes in class X SMA Negeri 1 Nimboran . This research was conducted at SMA Negeri 1 Nimboran in April - May 2021. The subjects in this study were all 52 students of class X majoring in science and the objects of research were learning styles, interest in learning and physics learning outcomes. The instruments used are questionnaires and documentation. Data analysis was carried out using the Pearson correlation test with a significance level of 0.05 and a regression test which resulted in conclusions as a result of the study. The results showed that, 1) there was a significant influence of learning style on physics learning outcomes with a contribution of 50.8%, 2) there was a significant influence of interest in learning on physics learning outcomes with a contribution of 60.9%, 3) there were significant influence of learning style and interest in learning, together on the learning outcomes of physics with a contribution of 64.3% influence

scholarly journals Association between Adenoid-Nasopharyngeal Ratio and Tympanogram Width in Adenoid Hypertrophy Patients

2021 ◽  
Author(s):  
Muhammad Arif Sudianto Utama ◽  
Widodo Ario Kentjono ◽  
Haris Mayagung Ekorini
Keyword(s):  
Risk Factor ◽  
Pearson Correlation ◽  
Radiographic Examination ◽  
Adenoid Hypertrophy ◽  
Significance Level ◽  
Average Value ◽  
Middle Ear Pressure ◽  
Skull Radiography ◽  
Pearson Correlation Test ◽  
Male Patients

Abstract Introduction Adenoid hypertrophy is a change in adenoid size that can lead to obstruction the Eustachian tube and become a risk factor for otitis media effusion (OME) in children. Standard objective examination of adenoid hypertrophy uses adenoid-nasopharyngeal ratio (A-N ratio) based on correct lateral skull radiography. Adenoid hypertrophy is one of the factors causing OME in children. There is still much debate about the association between A-N ratio and tympanogram width (Tw). Determining the association of A-N ratio and Tw in adenoid hypertrophy patients. Methods Participants performed a true lateral radiographic examination using Fujioka method to determine A-N ratio, and Tw to determine middle-ear pressure. The distance between examination of A-N ratio and tympanogram examination was at maximum of ~1 week. The association between A-N ratio and Tw in patients with adenoid hypertrophy used the Pearson correlation test. This research employed significance level p < 0.05. Results Most participants were aged between 6 and 10 years (38.10%), male patients (57.14%), and the symptom most participants complained of was snoring during sleep (38.10%). Most participants had A-N ratio of 0.53 to 0.70 (61.90%) with an average of 0.60 ± 0.05. The average value of Tw measurement was 102.83 ± 50.03 daPa (r = 0.605; p < 0.001). Conclusion There is a significant association between A-N ratio base on true lateral radiographic examination and Tw in adenoid hypertrophy patients.

scholarly journals Bone Loss around Dental Implants 5 Years after Implantation of Biphasic Calcium Phosphate (HAp/βTCP) Granules

2018 ◽  
Vol 2018 ◽  
pp. 1-7 ◽  
Author(s):  
Vadims Klimecs ◽  
Alexanders Grishulonoks ◽  
Ilze Salma ◽  
Laura Neimane ◽  
Janis Locs ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Calcium Phosphate ◽  
Bone Loss ◽  
Dental Implants ◽  
Biphasic Calcium Phosphate ◽  
Alveolar Bone ◽  
Clinical Situation ◽  
Cone Beam ◽  
Calcium Phosphate Ceramic ◽  
Middle Point

Biphasic calcium phosphate ceramic granules (0.5–1.0 mm) with a hydroxyapatite and β-tricalcium phosphate ratio of 90/10 were used. Biphasic calcium phosphate ceramic granules produced in the Riga Technical University, Riga Rudolph Cimdins Biomaterials Innovation and Development Centre, were used for filling the bone loss on 18 patients with peri-implantitis. After 5 years at the minimum, clinical and 3D cone-beam computed tomography control was done. Clinical situation confirmed good stability of implants without any signs of inflammation around. Radiodensity of the previous gap and alveolar bone horizontally from middle point of dental implants showed similar radiodensity as in normal alveolar bone. This trial is registered with ISRCTN13514478.

Postoperative Assessment of Incisor Dental Implants Using Cone-Beam Computed Tomography

2010 ◽  
Vol 36 (5) ◽  
pp. 377-384 ◽  
Author(s):  
Munetaka Naitoh ◽  
Hiromitsu Nabeshima ◽  
Hisashi Hayashi ◽  
Takehiko Nakayama ◽  
Kenichi Kurita ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Dental Implants ◽  
Cone Beam Computed Tomography ◽  
Bone Grafts ◽  
Cone Beam ◽  
Postoperative Assessment ◽  
Labial Side ◽  
Bone To Implant Contact ◽  
The Mean ◽  
Postoperative Findings

Abstract The bone configuration surrounding anterior dental implants was postoperatively assessed using cone-beam computed tomography (CBCT). In 21 patients with a mean age of 41.5 years, 36 implants placed in the incisor region were postoperatively evaluated using CBCT. The rate of bone-to-implant contact (%) was calculated. The mean rate of bone-to-implant contact on the labial side was 78.3% with and 65.3% without bone grafts. The postoperative findings of incisor implants could be assessed using CBCT.

scholarly journals The Validity of In Vivo Tooth Volume Determinations From Cone-Beam Computed Tomography

2010 ◽  
Vol 80 (1) ◽  
pp. 160-166 ◽  
Author(s):  
Yi Liu ◽  
Raphael Olszewski ◽  
Emanuel Stefan Alexandroni ◽  
Reyes Enciso ◽  
Tianmin Xu ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Cone Beam Computed Tomography ◽  
Interobserver Reliability ◽  
Pearson Correlation ◽  
Intraclass Correlation ◽  
Correlation Coefficients ◽  
Volumetric Analysis ◽  
Cone Beam ◽  
Water Displacement

Abstract Objective: To determine the accuracy of volumetric analysis of teeth in vivo using cone-beam computed tomography (CBCT). Materials and Methods: The physical volume (Vw) of 24 bicuspids extracted for orthodontic purposes (16 were imaged with the I-CAT and 8 with the CB MercuRay) were determined using the water displacement technique. Corresponding pretreatment CBCT image data were uploaded into Amira 4.0 for segmentation and radiographic volume (Va). All measurements were performed twice by two observers. The statistical difference between Vw and Va was assessed using a paired t-test. The intraobserver and interobserver reliability were determined by calculating Pearson correlation coefficients and intraclass correlation coefficients. Results: The overall mean Vw of teeth specimens was 0.553 ± 0.082 cm3, while the overall mean Va was 0.548 ± 0.079 cm3 (0.529 ± 0.078 cm3 for observer 1 and 0.567 ± 0.085 cm3 for observer 2). There were statistically significant differences between Va and Vw (P &lt; .05). Between observer 1 and observer 2, Va measurements were statistically significantly different (P &lt; .05). The interobserver and intraobserver correlation coefficient for Vw was high. Lastly, surface smoothing reduced the volume by 3% to 12%. Conclusions: In vivo determination of tooth volumes from CBCT data is feasible. The measurements slightly deviate from the physical volumes within −4% to 7%. Smoothing operations reduce volume measurements. Currently, no requirements for accuracy of volumetric determinations of tooth volume have been established.

scholarly journals Influence of intracanal post on apical periodontitis identified by cone-beam computed tomography

2009 ◽  
Vol 20 (5) ◽  
pp. 370-375 ◽  
Author(s):  
Carlos Estrela ◽  
Mike Reis Bueno ◽  
Olavo César Lyra Porto ◽  
Cleomar Donizeth Rodrigues ◽  
Jesus Djalma Pécora
Keyword(s):  
Computed Tomography ◽  
Cone Beam Computed Tomography ◽  
Apical Periodontitis ◽  
Cone Beam ◽  
Chi Square ◽  
Significance Level ◽  
Anterior Teeth ◽  
Kappa Value ◽  
Chi Square Test ◽  
Periapical Radiography

The determination of the success of endodontic treatment has been often discussed based on outcome obtained by periapical radiography. The aim of this study was to verify the influence of intracanal post on apical periodontitis detected by cone-beam computed tomography (CBCT). A consecutive sample of 1020 images (periapical radiographs and CBCT scans) taken from 619 patients (245 men; mean age, 50.1 years) between February 2008 and September 2009 were used in this study. Presence and intracanal post length (short, medium and long) were associated with apical periodontitis (AP). Chi-square test was used for statistical analyses. Significance level was set at p<0.01. The kappa value was used to assess examiner variability. From a total of 591 intracanal posts, AP was observed in 15.06%, 18.78% and 7.95% using periapical radiographs, into the different lengths, short, medium and long, respectively (p=0.466). Considering the same posts length it was verified AP in 24.20%, 26.40% and 11.84% observed by CBCT scans, respectively (p=0.154). From a total of 1,020 teeth used in this study, AP was detected in 397 (38.92%) by periapical radiography and in 614 (60.19%) by CBCT scans (p<0.001). The distribution of intracanal posts in different dental groups showed higher prevalence in maxillary anterior teeth (54.79%). Intracanal posts lengths did not influenced AP. AP was detected more frequently when CBCT method was used.

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