Post orthodontic treatment stability measurement in dentoskeletal class I malocclusion based on the objective grading system index

The purpose of this study was to examine the stability of orthodontic treatment results in dentoskeletal class I malocclusion treated with and without extraction of four premolars and to compare the stability of treatment result between those groups. Occlusal relationship after treatment and six-month post retention were measured on dental cast using The Objective Grading System Index at Orthodontic Specialist Clinic, Faculty of Dentistry Universitas Padjadjaran. The analytic descriptive study was carried out on 30 samples that comprised 14 samples were treated without extraction of four premolars and 16 samples were treated with extraction of four premolars. ABO Measuring Gauge was used to measure seven variables: tooth alignment, the height of the marginal ridges, buccolingual inclination, occlusal relationships, occlusal contacts, overjet, and interproximal tooth contacts. The results were statistically analyzed with the Wilcoxon rank test to test the difference of The Objective Grading System Index between posttreatment and postretension. Mann-Whitney U test was applied to determine the difference between the group with the extraction of four premolars and the group without extraction of four premolars. The level of significance was set at 0.05. The results of this study showed these following variables: tooth alignment, occlusal contacts, and overjet were unstable at the group with the extraction of four premolars, while only tooth alignment was found to be unstable in the group without extraction of the four premolars. Mann-Whitney U test did not show statistically significant difference in stability comparison test between the groups.

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The differences in the objective grading system index before and after dentoskeletal class I ortodontic treatment using the standard Edgewise appliances

Padjadjaran Journal of Dentistry ◽

10.24198/pjd.vol26no3.14002 ◽

2014 ◽

Vol 26 (3) ◽

Author(s):

Endah Damaryanti ◽

Bergman Thahar ◽

Jono Salim ◽

Endah Mardiati

Keyword(s):

Orthodontic Treatment ◽

Class I ◽

Grading System ◽

Panoramic Radiographs ◽

American Board Of Orthodontics ◽

Objective Grading System ◽

Before And After ◽

The Difference ◽

Smile Esthetics ◽

Dental Casts

Orthodontic treatment has a main purpose to reach balanced functional occlusion and create a harmonic esthetic face. But several studies indicates that orthodontic treatment influence smile esthetics, especially smile arc and buccal corridor. One-third of the treated patients showed a flat smile arc and orthodontic treatment with extraction resulted in excessive buccal corridors. The purpose of this research is to evaluate the difference of the Objective Grading System index, developed by the American Board of Orthodontics (ABO) and smile aesthetics in patients with Class I dentoskeletal malocclusion before and after orthodontic treatment. Twenty dental casts, panoramic radiographs and grouped pre and post-treatment. Dental casts and panoramic radiographs are scored according to the guidelines of the Objective Grading System. Extra-oral photographs were assessed by researcher using modified Goldstein dentofacial analysis. Result of measurements were evaluated with statistical t-test. Results of the research indicates Objective Grading System index and also score of smile esthetics before and after orthodontic treatment shows difference statistically (for Objective Grading System index P = -1121 > 2.09 and for smile esthetics P = 5.15 > 2.09). But extremely weak relationship was found between Objective Grading System index and Aesthetics smiles (231).

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Outcome assessment of lingual and labial appliances compared with cephalometric analysis, peer assessment rating, and objective grading system in Angle Class II extraction cases

The Angle Orthodontist ◽

10.2319/031014-173.1 ◽

2014 ◽

Vol 85 (3) ◽

pp. 400-407 ◽

Cited By ~ 9

Author(s):

Toru Deguchi ◽

Fumie Terao ◽

Tomo Aonuma ◽

Tomoki Kataoka ◽

Yasuyo Sugawara ◽

...

Keyword(s):

Treatment Outcomes ◽

Orthodontic Treatment ◽

Root Resorption ◽

Peer Assessment ◽

Class Ii ◽

Grading System ◽

Cephalometric Analysis ◽

Significant Difference ◽

Objective Grading System ◽

Peer Assessment Rating

ABSTRACT Objective: To validate our hypothesis that there would be significant differences in treatment outcomes, including cephalometric values, degree of root resorption, occlusal indices, and functional aspect, between cases treated with labial and lingual appliances. Materials and Methods: Twenty-four consecutively treated Class II cases with extractions and lingual appliance were compared with 25 matched cases treated with extraction and labial appliance. Orthodontic treatment outcomes were evaluated by cephalometric analysis, peer assessment rating, and an objective grading system (OGS). Additionally, functional analysis was also performed in both groups after orthodontic treatment. Statistical comparison was performed using the Wilcoxon signed rank test within the groups, and the Mann-Whitney U-test was used to compare between the labial and lingual groups. Results: The only significant difference between the groups was that the interincisal angle was larger in the lingual group than in the labial group. OGS evaluation showed that control over root angulation was significantly worse in the lingual group than in the labial group. There was no significant difference between groups in the amount of root resorption or in functional evaluation. Conclusions: Generally, lingual appliances offer comparable treatment results to those obtained with labial appliances. However, care should be taken with lingual appliances because they are more prone to produce uprighted incisors and root angulation.

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Invisalign and Traditional Orthodontic Treatment Postretention Outcomes Compared Using the American Board of Orthodontics Objective Grading System

The Angle Orthodontist ◽

10.2319/100106-398.1 ◽

2007 ◽

Vol 77 (5) ◽

pp. 864-869 ◽

Cited By ~ 52

Author(s):

Daniel Kuncio ◽

Anthony Maganzini ◽

Clarence Shelton ◽

Katherine Freeman

Keyword(s):

New York ◽

Orthodontic Treatment ◽

Rank Test ◽

Grading System ◽

American Board Of Orthodontics ◽

Signed Rank ◽

Objective Grading System ◽

Signed Rank Test ◽

Fixed Appliances ◽

One Year

Abstract Objective: To compare the postretention dental changes between patients treated with Invisalign and those treated with conventional fixed appliances. Materials and Methods: This is a comparative cohort study using patient records of one orthodontist in New York City. Two groups of patients were identified that differed only in the method of treatment (Invisalign and Braces group). Dental casts and panoramic radiographs were collected and analyzed using the objective grading system (OGS) of the American Board of Orthodontics (ABO). The cases were evaluated immediately after appliance removal (T1) and at a postretention time (T2), three years after appliance removal. All patients had completed active orthodontic treatment and had undergone at least one year of retention. A Wilcoxon rank sum test was used to evaluate differences in treatment outcomes between the groups for each of the eight categories in the OGS, including four additional subcategories in the alignment category. A Wilcoxon signed rank test was used to determine the significance of changes within each group from T1 to T2. Results: The change in the total alignment score in the Invisalign group was significantly larger than that for the Braces group. There were significant changes in total alignment and mandibular anterior alignment in both groups. There were significant changes in maxillary anterior alignment in the Invisalign group only. Conclusions: In this sample for this period of observation, patients treated with Invisalign relapsed more than those treated with conventional fixed appliances.

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PECULIARITIES OF TEETH SIZE IN ADOLESCENTS WHO ARE DIAGNOSED TO HAVE ANGLE’S CLASS I MALOCCLUSION AND DISPLAY DIFFERENT SOMATOTYPES

Wiadomości Lekarskie ◽

10.36740/wlek201905108 ◽

2019 ◽

Vol 72 (5) ◽

pp. 765-768

Author(s):

Lyubov V. Smahliuk ◽

Dmytro V. Sheshukov

Keyword(s):

Treatment Planning ◽

Orthodontic Treatment ◽

Class I ◽

Maxillary Incisor ◽

Treatment Results ◽

Male Adolescents ◽

Mandibular Canine ◽

The Difference ◽

The Stability ◽

Size Evaluation

Introduction: The issues on identifying criteria for teeth aesthetic and teeth size evaluation regarding body constitutional characteristics are still remaining undeveloped. The aim of this study was to specify the peculiarities of teeth size in adolescents who were diagnosed with Angle’s Class I malocclusion and display different somatotypes. Materials and methods: The study included 63 male and 66 female subjects diagnosed with Class I malocclusion by E. Angle classification (1906). Results: It has been determined that the 33rd tooth in hypersthenic female individuals is of a greater mesiodistal size than in normosthenic and asthenic body types (p <0.05). Left maxillary incisor in hypersthenic individuals is of a larger size than in asthenic and normosthenic (p <0,05). The normosthenic male individuals have been found out to have significantly larger size of all canines than that in the females (p <0,05). The asthenic male adolescents compared with females of the same somatotype there has been revealed the difference in the size of the left mandibular canine (p <0.05). The hypersthenic male adolescents demonstrate an increase in the size of the lateral maxillary incisors and the first right premolar (p <0,05) compared with those in female individuals of the same somatotype. Conclusions: Some peculiarities of mesiodistal size typical for adolescents with Angle’s Class I malocclusion and their somatotypes should be taken into account in treatment planning and maintaining the stability of orthodontic treatment results.

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Evaluation of Changes in TMJ Position for Angle Class I Malocclusion After Orthodontic Treatment by Using Cephalometric Radiograph

UI Proceedings on Health and Medicine ◽

10.7454/uiphm.v1i0.25 ◽

2017 ◽

Vol 1 ◽

Author(s):

Jian Ke Khoo ◽

Thahar Bergman ◽

Laviana Avi ◽

Firman Ria N

Keyword(s):

Orthodontic Treatment ◽

Sampling Technique ◽

Class I ◽

Angle Class ◽

Normal Occlusion ◽

Significant Difference ◽

Before And After ◽

Condyle Position ◽

Fixed Appliances ◽

The Difference

Objective: A concern in fixed appliances orthodontic treatment besides reestablishing the normal occlusion characteristics might cause repositioning of the condyle position in TMJ region. The objective of this research is to find out whether there is a difference of TMJ position in Angle class I malocclusion type 1, 2, 3, 4, and 5 before and after fixed appliances orthodontic treatment.Methods: This research is a pre-and-post design study with analytical statistical approach which compared the TMJ position obtained from tracings 80 lateral cephalometric radiographs before and after fixed appliances orthodontic treatment. Purposive sampling technique was used to determine the sample size in Orthodontic Department of Rumah Sakit Gigi dan Mulut Universitas Padjadjaran from 2009-2015. The data was analyzed by using Kolmogorov-Smirnov Test and paired t-test.Results: This study revealed that the changes of condyle position in Condylion to Vertical T line (horizontally) after orthodontic treatment is not significant (P> 0.05) in Angle class I malocclusion. However, the difference of condyle position in Condylion to TC line (vertically) shows a significant difference (P< 0.05) in Angle class I malocclusion.Conclusion: The distance of the condyle from Condylion to TC line increased after fixed appliances orthodontic treatment for Angle class I malocclusion patients.

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Stability and mutual impact of perception of parental pressure and infants' social support – A study based on the difference between employment status and household income

International Journal of Electrical Engineering Education ◽

10.1177/0020720921997059 ◽

2021 ◽

pp. 002072092199705

Author(s):

Yong Wang

Keyword(s):

Household Income ◽

Employment Status ◽

Working Mothers ◽

Social Research ◽

Research Report ◽

Parental Pressure ◽

Income Levels ◽

Significant Difference ◽

The Difference ◽

The Stability

The purpose of this study is to explore the stability and interaction between parental pressure and social research report, as well as the role of employment status and family income levels in this process. This study used a special study on Korean children (PSKC) 2–4 waves. Use t-test, correlation and autoregressive cross-delay modeling to analyze the data. The main findings of this study are: First, over time, parental pressure and mother’s social research report are consistent. Secondly, the pressure of motherhood and childcare has an obvious lagging effect on upbringing, and vice versa. Third, there is no significant difference between working mothers and non-working mothers in terms of the stability of working parents' pressure, social research report and social research report for children's pressure channels. However, parental pressure can only predict the social research report of working mothers. Fourth, there is no significant difference between the stability and interaction of these two structures in household income levels. In short, the results show that, over time, parental pressure is consistent with mother’s social research report. The results also show that there is a significant cross-lag effect between the mothers’ perceptions of mutual pressure analysis. In the process from parental pressure to social research report, I found the difference between working and non-working mothers. The advantage of this study is that the expected longitudinal design was adopted during infancy and the priority between the two structures can be considered. The results of this study can be used as a source of intervention plans to help parents withstand severe parenting pressure and lack of social research report.

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Cohort study of the overall survival of patients with pancreatic cancer in a hospital of specialties of Quito-Ecuador in the period 2007–2017

Innovative Surgical Sciences ◽

10.1515/iss-2020-0030 ◽

2021 ◽

Vol 0 (0) ◽

Author(s):

Andrés Moreno Roca ◽

Luciana Armijos Acurio ◽

Ruth Jimbo Sotomayor ◽

Carlos Céspedes Rivadeneira ◽

Carlos Rosero Reyes ◽

...

Keyword(s):

Pancreatic Cancer ◽

Cohort Study ◽

Survival Time ◽

Univariate Analysis ◽

Rank Test ◽

Kaplan Meier ◽

Significant Difference ◽

Icd 10 ◽

The Difference ◽

Clinical Records

Abstract Objectives Pancreatic cancers in most patients in Ecuador are diagnosed at an advanced stage of the disease, which is associated with lower survival. To determine the characteristics and global survival of pancreatic cancer patients in a social security hospital in Ecuador between 2007 and 2017. Methods A retrospective cohort study and a survival analysis were performed using all the available data in the electronic clinical records of patients with a diagnosis of pancreatic cancer in a Hospital of Specialties of Quito-Ecuador between 2007 and 2017. The included patients were those coded according to the ICD 10 between C25.0 and C25.9. Our univariate analysis calculated frequencies, measures of central tendency and dispersion. Through the Kaplan-Meier method we estimated the median time of survival and analyzed the difference in survival time among the different categories of our included variables. These differences were shown through the log rank test. Results A total of 357 patients diagnosed with pancreatic cancer between 2007 and 2017 were included in the study. More than two-thirds (69.9%) of the patients were diagnosed in late stages of the disease. The median survival time for all patients was of 4 months (P25: 2, P75: 8). Conclusions The statistically significant difference of survival time between types of treatment is the most relevant finding in this study, when comparing to all other types of treatments.

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Clinical Evaluation of Bracket Bonding Using Two Different Polymerization Sources

The Angle Orthodontist ◽

10.2319/072807-351.1 ◽

2008 ◽

Vol 78 (5) ◽

pp. 922-925 ◽

Cited By ~ 12

Author(s):

Nikolaos S. Koupis ◽

Theodore Eliades ◽

Athanasios E. Athanasiou

Keyword(s):

Failure Rate ◽

Orthodontic Treatment ◽

Light Emitting Diode ◽

Rank Test ◽

Dental Arch ◽

Halogen Lamp ◽

Failure Rates ◽

Bond Failure ◽

Significant Difference ◽

The Right

Abstract Objective: To comparatively assess clinical failure rate of brackets cured with two different photopolymerization sources after nine months of orthodontic treatment. Materials and Methods: The sample of this study comprised 30 patients who received comprehensive orthodontic treatment by means of fixed appliances. Using the same adhesive, 600 stainless steel brackets were directly bonded and light cured for 10 seconds with the light-emitting diode (LED) lamp or for 20 seconds with the conventional halogen lamp. A split-mouth design randomly alternated from patient to patient was applied. Failure rates were recorded for nine months and analyzed with Pearson χ2 test, and log-rank test at α = .05 level of significance. Results: The overall failure rate recorded with the halogen unit (3.33%) was not significantly different from the failure rate for the LED lamp (5.00%). Significantly more failures were found in boys compared with girls, in the mandibular dental arch compared with the maxillary arch, and in posterior segments compared with anterior segments. However, no significant difference was found between the right and left segments. Conclusion: Both light-curing units showed sufficiently low bond failure rates. LED curing units are an advantageous alternative to conventional halogen sources in orthodontics because they enable a reduced chair-time bonding procedure without significantly affecting bond failure rate.

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Clinical evaluation of the failure rate of metallic brackets bonded with orthodontic composites

Brazilian Dental Journal ◽

10.1590/s0103-64402012000400015 ◽

2012 ◽

Vol 23 (4) ◽

pp. 399-402 ◽

Cited By ~ 5

Author(s):

Fábio Lourenço Romano ◽

Rodrigo Alexandre Valério ◽

Jaciara Miranda Gomes-Silva ◽

José Tarcísio Lima Ferreira ◽

Gisele Faria ◽

...

Keyword(s):

Failure Rate ◽

Orthodontic Treatment ◽

Color Change ◽

Rank Test ◽

Initial Alignment ◽

Bond Failure ◽

Log Rank Test ◽

Significant Difference ◽

Mandibular Teeth

The purpose of the present study was to evaluate in vivo the failure rate of metallic brackets bonded with two orthodontic composites. Nineteen patients with ages ranging from 10.5 to 38.7 years needing corrective orthodontic treatment were selected for study. The enamel surfaces from second premolars to second premolars were treated with Transbond Plus-Self Etching Primer (3M Unitek). Next, 380 orthodontic brackets were bonded on maxillary and mandibular teeth, as follows: 190 with Transbond XT composite (3M Unitek) (control) and 190 with Transbond Plus Color Change (3M Unitek) (experimental) in contralateral quadrants. The bonded brackets were light cured for 40 s, and initial alignment archwires were inserted. Bond failure rates were recorded over a six-month period. At the end of the evaluation, six bond failures occurred, three for each composite. Kaplan-Meyer method and log-rank test (Mantel-Cox) was used for statistical analysis, and no statistically significant difference was found between the materials (p=0.999). Both Transbond XT and Transbond Plus Color Change composites had low debonding rates over the study period.

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Dynamics Analysis of a Mathematical Model for New Product Innovation Diffusion

Discrete Dynamics in Nature and Society ◽

10.1155/2020/4716064 ◽

2020 ◽

Vol 2020 ◽

pp. 1-13

Author(s):

Chunru Li ◽

Zujun Ma

Keyword(s):

Mathematical Model ◽

Time Delay ◽

Media Coverage ◽

New Product ◽

Normal Form Theory ◽

Center Manifold Theorem ◽

Significant Difference ◽

Form Theory ◽

The Difference ◽

The Stability

In this paper, a mathematical model with time-delay-related parameters and media coverage to describe the diffusion process of new products is proposed, in which the time-delay-related parameters denote the stage in which potential customers decide whether to adopt a new product. Then, the stability and the Hopf bifurcation of the proposed model are analyzed in detail. The center manifold theorem and the normal form theory are used to investigate the stability of the bifurcating periodic solution. Moreover, a numerical simulation is conducted to investigate the difference between the model with delay-dependent parameters and that with delay-independent parameters. The results show that there is significant difference between the two models.

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