scholarly journals Esthetic Assessment Succeeding Anterior Atrophic Maxilla Augmentation with Cancellous Bone-Block Allograft and Late Restoration Loading

2021 ◽  
Vol 10 (20) ◽  
pp. 4635
Author(s):  
Sarit Naishlos ◽  
Eran Zenziper ◽  
Helena Zelikman ◽  
Joseph Nissan ◽  
Shaked Mizrahi ◽  
...  
Keyword(s):  
Cancellous Bone ◽  
Threshold Value ◽  
Mean Value ◽  
Bone Block ◽  
Anterior Maxilla ◽  
Long Term Stability ◽  
Implant Placement ◽  
Atrophic Maxilla ◽  
The Mean ◽  
Loading Methods

Background: Various conditions may lead to bony deficiency in the anterior maxilla. The present study evaluated esthetic (PES—pink esthetic score and WES—white esthetic score) results after augmentation of the anterior atrophic maxilla using cancellous bone-block allograft followed by implant placement and late (conventional) loading. Methods: Cohort study that included 33 patients with missing teeth in the upper anterior region characterized by extensive bone loss. Allogeneic cancellous bone-blocks were used for augmentation. Six months later, a dental implant was inserted. After a waiting time of an additional six-months, implant exposure and reconstruction were performed. The mean follow-up period was 62.93 ± 17.37 months (range 19–82 months). Results: The mean value of PES/WES was 17.8 ± 2.78. All patients had a PES/WES value above 12 (threshold value defined as clinically acceptable esthetics). The mean value of PES was 9.0 ± 1.79 and the mean value of WES was 8.8 ±1.84. Conclusions: Bone augmentation of the anterior atrophic maxilla using cancellous block-allograft and late loading supports achievement of a predictable esthetic result with long-term stability of soft and hard tissues around implant-supported reconstructions.

scholarly journals Unprotected autogenous bone block grafts in anterior maxilla: Resorption rates and clinical outcomes

2017 ◽  
Vol 74 (4) ◽  
pp. 305-310
Author(s):  
Ivan Kosanic ◽  
Miroslav Andric ◽  
Bozidar Brkovic ◽  
Vladimir Kokovic ◽  
Milan Jurisic
Keyword(s):  
Bone Grafts ◽  
Autogenous Bone ◽  
Bone Block ◽  
Alveolar Ridge ◽  
Implant Stability ◽  
Anterior Maxilla ◽  
Ridge Augmentation ◽  
Implant Placement ◽  
Mean Width ◽  
The Mean

Background/Aim. The use of autogenous bone grafts for augmentation of the resorbed alveolar ridge is still considered the gold standard in implant dentistry. The aim of this study was to analyze the resorption rate of autogenous bone block grafts from the retromolar region placed in the frontal segment of the upper jaw unprotected by barrier membranes, to assess the stability of implants placed into the grafted bone, as well as to monitor its changes during the healing period. Methods. The study included 18 patients with a total of 20 grafted sites. The residual alveolar ridge was measured before and after the augmentation and prior to implant placement. All implants were restored with provisional crowns within 48 hours after the placement. Implant stability was assessed using resonance frequency analysis. Results. The average period from ridge augmentation to reentry was 5.4 months (range 4?6 months). At reentry the healed alveolar ridge had a mean width of 6.1 ? 1.27 mm. The mean calculated width gain was 3.04 ? 1.22 mm. The overall surface resorption of block grafts was 0.68 ? 0.69 mm (18.85%). At the time of implant placement the mean value of implant stability quotient (ISQ) was 71.25 ? 5.77. The lowest ISQ values were noted after three weeks of healing, followed by a gradual increase until week 12. After 12 weeks implants showed significantly higher ISQ values compared to primary stability (p < 0.05 Wilcoxon signed ranks test). During the 3-years followup period no cases of implant loss were recorded. Conclusion. Despite a significant resorption of bone grafts, it was possible to place implants in all the cases and to use the immediate loading protocol without affecting implant survival rate.

Algorithm for Automatic Pattern Classification Designed for Real Metallographic Images

2014 ◽  
pp. 165-179
Keyword(s):  
Pattern Classification ◽  
Threshold Value ◽  
Mean Value ◽  
Process Quality ◽  
Steel Plant ◽  
Central Axis ◽  
Grey Scale ◽  
The Mean ◽  
Metallographic Images

The problem of automatic pattern classification in real metallographic images from the steel plant ArcelorMittal Ostrava is addressed. The goal is to monitor the process quality in the steel plant. In the images of metal, there are dark dots that are produced by imperfections along the central axis of each plate. It is necessary to determine automatically the number and sizes of these dots. The number and sizes of the dots is a measure of how imperfect each plate is. The process is presented that segments the area of plates that contains segregation, identifies those rows of pixels along which the dots lie, and counts the pixels that are marked as dots by evaluating all the vertical columns of pixels that intersect the rows that contain the dots. The threshold value is set to be 95% of the mean value of grey scale for each column of pixels and makes the dots white. White dots that are most likely noise are removed to identify dots that are smaller than 4 connected pixels across. The explanations related to the obtained results are firmly related to the information provided by human experts.

scholarly journals Long-term Stability of Soft Tissue Esthetic Outcomes Following Conventional Single Implant Treatment in the Anterior Maxilla: 10-12 Year Results

2016 ◽  
Vol 10 (1) ◽  
pp. 602-609 ◽  
Author(s):  
A Rokn ◽  
SH Bassir ◽  
AA Rasouli Ghahroudi ◽  
MJ Kharazifard ◽  
R Manesheof
Keyword(s):  
Soft Tissue ◽  
Anterior Maxilla ◽  
Term Stability ◽  
Long Term Stability ◽  
Implant Placement ◽  
Single Tooth ◽  
Delayed Implant Placement ◽  
Implant Treatment

Purpose: The present study aimed to evaluate the long-term stability of esthetic outcomes of soft tissue around maxillary anterior single-tooth implants after 10-to-12 years of loading. Methods: Patients who had been treated for single-tooth implants in the anterior maxilla between February 2000 and July 2002 were invited to participate in the study. All implants had been placed according to delayed implant placement and conventional loading protocols without any connective tissue graft or papilla preservation flaps. Pink Esthetic Score (PES) was rated using standardized clinical photographs to assess the esthetic outcomes of the implant treatment at the time of crown placement and at time of follow-up examination which was at least 10 years after the crown placement. Results: A total of 19 patients were included. The mean score of PES was 11.63 (SD 1.61; range 7-14) at baseline. After 10-to-12 years of function, a mean PES score of 11.05 (SD 2.09; range 6–14) was recorded. No significant differences were found in the esthetic outcomes, categorized based on clinically relevant levels, between the baseline and follow-up session (p>0.05). Conclusion: Within limitation of the present study, it can be concluded that the esthetic outcomes of soft tissue around the maxillary anterior single-tooth implants placed using conventional implant placement technique remained stable in the long-term.

Contamination and Radionuclides Concentration in Imported Canned Foodstuffs in Baghdad Markets

2015 ◽  
Vol 61 ◽  
pp. 49-57
Author(s):  
Abdul Jabbar Abbas Oudah ◽  
Asia H. Al-Mashhadani
Keyword(s):  
Sweet Corn ◽  
Milk Powder ◽  
Threshold Value ◽  
Mean Value ◽  
Dose Equivalent ◽  
Radium Equivalent Activity ◽  
High Purity Germanium ◽  
Radium Equivalent ◽  
The Mean ◽  
Indoor And Outdoor

This work was concerned with study the contamination and concentration of natural and man-made radioactivity 40K, 137Cs, 214Bi (238U series) and 228Ac (232Th series) in 19 different imported foodstuffs canned samples (Mushrooms, Black Olives, Broad Beans, Peaches, Sweet Corn, Tomato Past, Green Peas, Chick Peas, Baby milk 1,2,3 and Full milk powder) , were collected from locally markets in different regions in Baghdad city. Samples were analyzed by high-purity germanium (HPGe) detector gamma spectrometer systems from Canberra, with high resolution (2.0 keV at 1332 keV) and relative efficiency of ~30% for 137Cs (661.7 keV) and provide (Software Genie 2000 from Canberra). From the data obtained, the activity concentrations (Bq/kg or Bq/l) for 40K, 137Cs, 214Bi and 228Ac in above foodstuff samples were measured. It was found that these values lie within the worldwide range for radioactivity in food. The mean value of radium equivalent activity (Raeq) in all samples it was below the threshold value of 370 Bq/kg. The all value of indoor and outdoor annual effective dose equivalent in samples it was lower than the world average values (0.45 mSv/y for indoor and 0.07 mSv/y for outdoor).

Early Implant Placement in Bilateral Sinus Floor Augmentation Using Iliac Bone Block Grafts in Severe Maxillary Atrophy: A Clinical, Histological, and Radiographic Case Report

2009 ◽  
Vol 35 (1) ◽  
pp. 37-44 ◽  
Author(s):  
Alessandro Acocella ◽  
Roberto Sacco ◽  
Paolo Nardi ◽  
Tommaso Agostini
Keyword(s):  
Bone Graft ◽  
Maxillary Sinus ◽  
Dental Implants ◽  
Autologous Bone Graft ◽  
Bone Block ◽  
Alveolar Ridge ◽  
Implant Placement ◽  
Posterior Maxilla ◽  
Atrophic Maxilla ◽  
Maxillary Atrophy

Abstract Effectively restoring a grossly atrophic maxilla can be difficult for the implant surgeon. The placement of dental implants in patients who are edentulous in the posterior maxilla can present difficulties because of deficient posterior alveolar ridge and increased pneumatization of the maxillary sinus, resulting in a minimal hard tissue bed. Implant placement requires adequate quality and quantity of bone, especially in the posterior maxilla. Insufficient bone height and width in this area of the maxilla, because of expansion of the maxillary sinus and atrophic reduction of the alveolar ridge, represents a contraindication for conventional insertion of dental implants. The reconstruction of edentulous patients with adequate bone volume and density by the use of bone graft and, subsequently, the placement of dental implants has become a viable treatment option with high predictability. It is commonly shared that autologous bone graft is the gold standard grafting method in the augmentation of Higmoro antrum and in any kinds of guided bone regeneration. In this article, the authors report a case of severe maxillary atrophy that is augmented by block bone graft harvested from iliac crest. An early placement of implants is possible due to the quick healing of the site, as proven by histologic examinations.

Evaluation of Effects of Topical Melatonin Application on Osseointegration of Dental Implant: An Experimental Study

2016 ◽  
Vol 42 (5) ◽  
pp. 386-389 ◽  
Author(s):  
Serkan Dundar ◽  
Ferhan Yaman ◽  
Arif Saybak ◽  
M. Fatih Ozupek ◽  
Vesile Elif Toy ◽  
...  
Keyword(s):  
Experimental Study ◽  
Soft Tissues ◽  
Mean Value ◽  
Control Group ◽  
Bone Implant ◽  
Implant Placement ◽  
The Mean ◽  
Implant Integration ◽  
Additive Materials ◽  
New Zealand Rabbits

The aim of the present study was to evaluate the effect of local melatonin application during surgery on bone implant connection (BIC) in rabbit tibiae. Six 0.8- to 1-year-old male New Zealand rabbits were divided into 3 groups: (1) a control group (CG) in which rabbits were not treated with additive materials and only implant integration was executed; (2) a melatonin dose 1 (MLT D-1) group in which rabbits were treated with 1.2 mg of melatonin locally before implant placement into the rabbits' tibiae; and (3) a melatonin dose 2 (MLT D-2) group in which rabbits were treated with 3 mg melatonin locally before implant placement into the rabbits' tibiae. Four weeks after the procedure, the rabbits were euthanized; their tibiae were dissected from muscles and soft tissues, fixed with formaldehyde, and later embedded in methacrylate. Histologic and histomorphometric analyses were then performed under light microscopy. Following this, BIC was detected histomorphometrically, and P &lt; .05 was considered statistically significant. Results showed that the highest BIC percentage was detected in MLT D-2, with a mean value of 39.46% ± 0.78, as compared with a mean value of 33.89% ± 0.92 in group MLT D-1 and 27.42% ± 0.89 in CG. Similarly, the mean BIC percentage of the MLT D-2 group was the highest among the three, with the mean BIC percentage of the MLT D-1 still registering as higher than CG. Within the limitations of this rabbit study, it appears that local melatonin application during implant surgery may improve BIC.

Orbit Response Recognition During Touchdowns by Instantaneous Frequency in Active Magnetic Bearings

2017 ◽  
Vol 140 (2) ◽  
Author(s):  
Mindong Lyu ◽  
Tao Liu ◽  
Zixi Wang ◽  
Shaoze Yan ◽  
Xiaohong Jia ◽  
...  
Keyword(s):  
Instantaneous Frequency ◽  
Sampling Period ◽  
Threshold Value ◽  
Mean Value ◽  
Magnetic Bearings ◽  
Active Magnetic Bearings ◽  
Local Variance ◽  
Displacement Signal ◽  
Novel Method ◽  
The Mean

During touchdowns of active magnetic bearings (AMB), the violent collision between rotors and touchdown bearings (TDB) can cause damages to both parts. Orbit response recognition provides a way for the AMB controller to automatically switch the control algorithm to actively suppress the rotor–TDB vibration and promptly relevitate the rotor during touchdowns. A novel method based on Hilbert transform (HT) is proposed to recognize the orbit responses (pendulum vibration, combined rub and bouncing, and full rub) in touchdowns. In this method, the rotor suspension status is monitored by the AMB controller in real-time. When touchdown is detected, the rotor displacement signal during the sampling period is intercepted, and the instantaneous frequency (IF) is calculated by HT. Then, the local variance of IF during the sampling period is calculated, and it is compared with the threshold value. Combined rub and bouncing can be identified for it has the largest local variance. Finally, the mean value of IF during the sampling period is calculated and is compared with the other threshold value. Pendulum vibration can be identified for it has a lower and fixed mean value, while full rub has a larger value. The principle of the recognition method is demonstrated by the simulated results of a thermo-dynamic model. The results reveal that the method is feasible in recognizing the orbit responses and can be implemented in the AMB controller to help switch the control algorithms automatically in case of touchdowns.

Order Decision by Difference Method for Least Square in Trend Fitting

2012 ◽  
Vol 160 ◽  
pp. 373-376
Author(s):  
Yu Hua Dong ◽  
Xin Ming Zhou
Keyword(s):  
Difference Method ◽  
Threshold Value ◽  
High Accuracy ◽  
Mean Value ◽  
Least Square ◽  
Decision Criteria ◽  
Trend Extraction ◽  
Proper Order ◽  
The Mean ◽  
Fitting Accuracy

A difference method to order decision for least square in trend fitting is proposed in this paper. When the least square is used for fitting trend, choosing the proper order is important for trend fitting accuracy. We can use difference n times to obtain difference result data, and the mean value can be taken as decision criteria. Comparing with the threshold value, when the mth difference result mean is smaller, the trend fitting order for least square can be set to m. Simulation processing results show that this method resolve the problem of order decision for least square in trend fitting, and the method has high accuracy for trend extraction.

scholarly journals Evaluation of Radiation Hazard Indices in Mining Sites of Nasarawa State, Nigeria

2020 ◽  
pp. 8-16
Author(s):  
U. Rilwan ◽  
I. Umar ◽  
G. C. Onuchukwu ◽  
H. A. Abdullahi ◽  
M. Umar
Keyword(s):  
Gamma Spectrometry ◽  
Sodium Iodide ◽  
Threshold Value ◽  
Mean Value ◽  
Radiation Hazard ◽  
Hazard Indices ◽  
Mean Values ◽  
Mining Sites ◽  
The Mean ◽  
Radiation Hazard Indices

This work evaluates the radiation hazard indices from some selected mining sites in Nasarawa West, using Sodium Iodide Thallium Gamma Spectrometry. Raeq ranged from 100.39-197.40 Bq/Kg with a mean 161.44 Bq/Kg, which is lower than the average of 370 Bq/Kg. The GADR ranged from 44.85 nGy/hr-90.71 nGy/hr with the mean 73.68 nGy/hr. which is also below the average of 89 nGy/hr for soil. The AGED ranged from 315.77 mSv/yr-640.91 mSv/yr with the mean 519.19. Which is above the threshold value of 300 mSv/yr. ACI ranged from 0.73-1.45 with the mean value 1.18 which is above the standard of unity. The AEDE (outdoor) ranges from 0.055 mSv/yr-0.111 mSv/yr with the mean 0.090 mSv/yr which is above the 0.07 mSv/yr standard permissible limit. The AEDE (indoor) ranged from 0.220 mSv/yr-0.445 mSv/yr, with the mean value 0.361mSv/yr. This is below the 0.45 mSv/yr threshold. The ELCR ranged from 00.770-1.558 with the mean value 1.265 and from 0.193-0.389 with the mean value 0.317 for outdoor and indoor respectively, which exceed the 0.29 X 10-3 threshold limit. The External  and  Internal  Hazard  indices ranges from 0.271-0.533 and 0.289-0.675 as well as mean values 0.435 and 0.512 respectively, which are  below the threshold. Therefore, there may be serious radiological effects to the populace.

Cancellous Bone Block Allografts for the Augmentation of the Anterior Atrophic Maxilla

2011 ◽  
Vol 13 (2) ◽  
pp. 104-111 ◽  
Author(s):  
Joseph Nissan ◽  
Ofer Mardinger ◽  
Shlomo Calderon ◽  
George E. Romanos ◽  
Gavriel Chaushu
Keyword(s):  
Cancellous Bone ◽  
Bone Block ◽  
Atrophic Maxilla
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