Gonial Angle as an Indicator for Growth Pattern

Gonial Angle as an Indicator for Growth Pattern ABSTRACT: Aim: To determine the gonial angle, upper gonial angle and lower gonial angle in patients with horizontal, vertical and average growth pattern belonging to the local Chennai population and determine if it can be used as a growth indicator. Materials and Methods: Gonial angle, upper gonial angle and lower gonial angle measurements were made on lateral cephalograms of 90 patients 44 males and 46 females. Results A one sample T test was used to determine the mean values for average, horizontal and vertical growth pattern and to check their level of significance. All the values were statistically significant with a P value = 0.000.  Conclusion: The upper gonial angle was the same irrespective of growth pattern. The gonial angle and lower gonial angle can be used as an indicator for growth. INTRODUCTION: Gonial angle is widely used in orthodontic cephalogram tracing. It is a valuable indicator to diagnose the growth pattern of patients and also determines the rotation of the mandible. The gonial angle can also be a handy tool in age assessment in extreme situations like mass disaster, remains of human dead exhumed and murderous mutilations, missing individuals, etc.[1]. The downward and backward rotation of the mandible is called as a high angle and these patients showed increased gonial angle. Contrary to this, upward and forward direction of mandible is called as a low angle and these patients showed a decrease in gonial angle.[2] Thus, it becomes one of the most important angles for determining orthodontic or surgical plans in a patient. A few studies focused on the mandibular angle, its change throughout aging, and changing relation to dental status. This study was conducted on lateral cephalograms of a total of 90 subjects. The aim of this study was to evaluate the gonial angle as an indicator for the growth pattern. MATERIALS AND METHODS: Lateral cephalograms of 90 patients which includes 44 males and 46 females belonging to the local Chennai population were obtained from the patient records of the department of Orthodontics. The growth pattern were grouped into three groups namely vertical growth pattern, average growth pattern and horizontal growth pattern based on the clinical and cephalometric FMA. The gonial angle was measured by taking the tangent to the posterior border of the ramus and tangent to the lower border of the mandible on lateral cephalogram (Fig 1). Because of the superimpositions seen on lateral cephalograms, reliable measurement of the gonial angle becomes difficult. The gonial angle was measured on the lateral cephalometric radiograph using a mathematical protractor. The angle is recorded in degrees. FMA, gonial angle, upper gonial angle and lower gonial angle are measured. Frankfort mandibular plane angle is the angle formed between FHP and mandibular plane (Tweeds, 1954).[3] Gonial angle is the angle formed by the points articulare, gonion and methon. Upper Gonial angle is the angle formed by the points articulare, gonion and nasion and lower Gonial angle is the angle formed by the points nasion, gonion and meton. The cephalograms were traced on matte acetate paper with 2H pencil under double illumination. Since only angular measurements were recorded magnification was not calculated. The values obtained were tabulated and subjected to statistical evaluation. STATISTICAL ANALYSIS: A one sample T test was done using SPSS 22 software to determine the mean values for average, horizontal and vertical growth pattern and to check their level of significance. RESULTS: Table 1 and Graph 1shows the results obtained. In patients with horizontal growth pattern, the mean value for the FMA was 19.6 °Ã‚ ±0.45 ° (P=0.000). The mean value for the gonial angle was 122.43 °Ã‚ ± 1.40 °(P=0.000). Mean value for lower and upper gonial angle were 66.80 °Ã‚ ±.01 ° and 55.30 °  ±0. 99 ° respectively with (P=0.000). In patients with vertical growth pattern, the mean value for the FMA was 33.93 °Ã‚ ± 1.32 °(P=0.000). Mean value for gonial angles was 130.20 °Ã‚ ±1.39 ° (P=0.000).Mean value for lower and upper gonial angle were 76.40 °Ã‚ ±1.39 °and 53.80 °Ã‚ ±1.15 ° respectively with (P=0.000). In the average growth pattern, the mean value for the FMA was 24.93 °Ã‚ ± 0.26 ° (P=0.000). The mean value for gonial angle was 127.03 °Ã‚ ±0.997 ° (P=0.000). Mean value for lower and upper gonial angle were 71.53 °Ã‚ ±0.9 ° and 55.17 °Ã‚ ±1.07 °respectively (P=0.000). DISCUSSION: Evaluation of growth pattern plays a major role in diagnosis and treatment planning. There are various cephalometric parameters to evaluate growth pattern. Those commonly used are SN to mandibular plane, Frankfurt horizontal plane angle and Jarabak’s ratio. However, fault in the SN plane and Frankfurt horizontal plane can produce erroneous results in growth pattern. The Jarabak’s ratio is based on the posterior and anterior facial height and does not reflect the rotation of the mandible. In the present study the samples were grouped into horizontal, average and vertical growth pattern based on the clinical and cephalometric FMA. The mean value of FMA was determined for each group and was found to be 19.6 °Ã‚ ±0.45 °, 24.93 °Ã‚ ± 0.26 ° and 33.93 °Ã‚ ± 1.32 ° for horizontal, average and vertical growth pattern and the values obtained were statistically significant with a P value of 0.000 and confidence interval of 95%. The gonial angle ranged from 119.5749 ° to 125.2918 ° in horizontal growers, 127.5048 ° to 132.8952 ° in vertical growers and 124.9940 ° to 129.0726 ° in average growers. The lower gonial angle range from 64.7351 ° to 68.8649 ° in patients with horizontal growth pattern, 73.5518 ° to 79.2482 ° in average growth pattern and 69.6812 ° to 73.3855 ° in vertical growth pattern. The upper gonial angle ranged from 53.2568 ° to 57.3432 ° in horizontal growth pattern, 51.4518 ° to 56.1482 ° in vertical growth pattern a nd 52.9738 ° to 57.3596 ° in average growth pattern. It can be seen that the upper gonial angle is almost the same in horizontal, vertical and average growth pattern. The lower gonial angle on the contrary increased in the degree of angulation from horizontal, average and vertical growth pattern and can be used as an indicator for assessing growth pattern. According to Rakosi,[4] the norm value for gonial angle in Caucasians with average growth pattern ranged from 128 °Ã‚ ±7 ° which was almost similar to our measurements 127.0333 °Ã‚ ±.99710 ° and ranged from 124.9940 ° to 129.0726 °. The upper gonial angle in Caucasians with average growth pattern ranged from 52 ° to 55 ° but in our sample it had a mean value of 55.1667 °Ã‚ ±1.07220 ° ranging from 52.9738 ° to 57.3596 °. The lower gonial angle in Caucasians was between 70 ° to 75 °. In the present sample the lower gonial angle ranged from 69.6812 ° to 73.3855 ° with a mean of 71.5333 °Ã‚ ±.90558 °. This value was less compared to the Caucasian population. CONCLUSION: The upper gonial angle was the same irrespective of growth pattern The lower gonial angle increases from horizontal, average and vertical growth pattern The lower gonial angle in the present sample is less compared to Caucasians The mean values in average growth in the local Chennai population were 127.03 °Ã‚ ±0.997 °, 71.53 °Ã‚ ±0.9 ° and 55.17 °Ã‚ ±1.07 ° for gonial angle, lower gonial angle and upper gonial angle respectively. All the values were statistically significant with a P value = 0.000 The lower gonial angle can be used as an indicator for growth pattern

Qualitative vs. Quantitative Research Essay -- Research Analysis

In this paper, the author will delineate the characteristics between qualitative and quantitative research, as well as their methodologies. The purpose of this paper is to give the reader a brief glimpse behind each research approach, by determining the strengths and weaknesses of both. The terms â€Å"subjective† and â€Å"objective† will be viewed in accordance with each research paradigm by considering the role of the observer and addressing how the researcher conducts his or her analysis using these approaches. The author will also describe the preferred approach given to each modality and how each model can be utilized in a study of aggression. Qualitative and Quantitative are two differentiated paradigms of research, which operate under the assumption that measured outcomes, must be proven valid and reliable. However, the distinguishing element between each paradigm resolves to the role of the researcher. Although they can be explicated by the source of the data collected, qualitative being a semantic text and quantitative being in numerical form, in the qualitative paradigm, the role of the researcher is to be an active participant within the study, lending the subjectivity of interpretation to the final measured outcome (Denzien & Lincoln, 2000). However, the quantitative approach finds the role of the researcher as an outside, objective observer, where the possibility for researcher bias is reduced, and the final measured outcome is not subject to researcher interpretations (Patton, 1996). Qualitative Research Qualitative research is a multi-dimensional method that utilizes an imperative and naturalistic approach. This design is associated with a phenomenological paradigm and is used by observing human behavior in... ...ht eliminate the need for research participation by sending out surveys in the mail randomly. The qualitative methodology might use an example a focus group. Where the researcher is an active participant in asking open-ended questions, specifically to engage the participants and prompt interpretive answers reflective of emotionality. When considering the manipulation of variables to alter conditions that are observable and measurable, quantitative analysis could include the manipulation of environmental factors, such as room temperature, lighting, etc, where the researcher is an outside, unattached observer. The qualitative paradigm would insist that the researcher be a participant of the factors of manipulation by using interruptive techniques, verbal commands, etc, and determine the measurable effects on the outcome through personal interpretation of data.

Essay on the Angel of a Woman in The Birthmark -- Birthmark Essays

Angel of a Woman in â€Å"The Birthmark†Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚      Nathaniel Hawthorne’s short story, â€Å"The Birthmark,† contains a wonderful example of the perfect wife. This essay will develop that theme.    In the opening paragraph of â€Å"The Birthmark† the narrator introduces Aylmer as a scientist who â€Å"had made experience of a spiritual affinity more attractive than any chemical one.† Hawthorne’s description of the scientist’s love for Georgiana is apt, for love is just that – spiritual. And the theme of this tale is a spiritual one. Through the course of the story Aylmer declines spiritually, while Georgiana advances spiritually.    Even after Aylmer has â€Å"persuaded a beautiful woman to become his wife,† he is not capable of loving her properly, unselfishly, because he â€Å"had devoted himself, however, too unreservedly to scientific studies ever to be weaned from them by any second passion.† The narrator seeks to justify this error or lack in Aylmer by explaining that â€Å"it was not unusual for the love of science to rival the love of woman in its depth and absorbing energy.† Already at the outset of the tale, the reader perceives that Georgiana is going to be shortchanged in this marriage. She is exposed to the problem initially when her husband asks whether â€Å"it never occurred to you that the mark upon your cheek might be removed?'' Aylmer is in quest of physical perfection in his wife; unfortunately he discounts her inner, spiritual value so clearly manifested in her comment: ``To tell you the truth it has been so often called a charm that I was simple enough to imagine it mi ght be so.'' In using the word â€Å"simple† she is being honest and not sarcastic; she is being humble and respectful of others’ (parents?) evaluation of herself. T... ...dab: â€Å"Laugh, thing of the senses! You have earned the right to laugh.'' But there is no success, for with great tenderness and concern for her husband’s happiness, Georgiana softly says, â€Å"I am dying!† The narrator’s beautifully poetic way of expressing the demise of the wife is memorable: â€Å"The fatal hand had grappled with the mystery of life, and was the bond by which an angelic spirit kept itself in union with a mortal frame.† The soul of this angelic, loving woman, â€Å"lingering a moment near her husband, took its heavenward flight.† A true angel of womankind is ascending to heaven.    WORKS CITED    Hawthorne, Nathaniel . The Birthmark Electronic Text Center, University of Virginia Library http://etext.lib.virginia.edu/etcbin/toccer-new2?id=HawBirt.sgm&images=images/modeng&data=/texts/english/modeng/parsed&tag=public&part=1&division=div1      

Karl Marxs Theory of Capitalism Essay -- Papers

Karl Marx's Theory of Capitalism Marxism like functionalism is concerned with the overall picture of society. Marxism is seen as a conflict theory, Mainly because they see the primary interests of society as a whole as being made up of conflicting groups with conflicting interests or beliefs. We are a very materialistic society. A society made up of those who have, and those who have not. Marxists sociologists say that there will never be true social harmony because there are too many inequalities within our cultural society. Marx gave names to the haves and have nots, they are known as the Bourgeoise and the Proletariats. One way of assessing the power of the upper class is through the study of elites (people who fill the top positions in each of the major institutions of society); most of the sociological debates have centered on economic elites and political elites. (Sociology in focus 5th Edition, 2000, page 53) The main question asked by Marxist sociologists is how we all can benefit equally and how can we get rid of the social inequalities present in our society. They differ form functionalists in the way that they see the difference. Marxist sociologists see them as being persistent and not just as a temporary state of affairs to be overcome. Their theories state that for the superstructure to be effective, the infrastructure must function effectively, therefore any changes no matter how small, within the infrastructure will reflect in the superstructure causing severe change and possible disturbances. If production costs rise [...] Intr... ...s, but it has been used to disguise the true set of relations that undergird capitalism. Criticisms Marx has faced a number of criticisms. Most importantly, actual existing communism failed to fulfill its promise. Though these experiments may have distorted Marx's thought, Marxist theory certainly did not reflect its practice. Second, history has shown that workers have rarely been in the vanguard of revolutionary movements, and indeed have resisted communism in some places. Third, Marx failed to adequately consider gender as factor in the reproduction of labor and commodity production. Fourth, some have accused Marx of focusing far too much on production, without giving enough attention to the act of consumption. Last, Marx's historical materialist approach uncritically accepts Western notions of progress.

Most Effective Hand Cleaner

Most Effective Hand Cleaner Introduction: The purpose of this experiment is to: (a) determine if hand soap or alcohol gel is the most effective in killing Staphylococcus aureus (b) obtain the statistical difference of effectiveness in killing S. aureus between hand soap and alcohol gel. The null hypothesis is that neither hand soap nor alcohol gel is effective in killing S. aureus more than the control group which is nothing at all. The alternate hypothesis is that hand soap versus the control group will be more effective in killing S. ureus and/or alcohol gel versus the control group will be more effective in killing S. aureus. Another alternate hypothesis is that alcohol gel is more effective in killing S. aureus than the hand soap. Materials and Methods: The bottom of a Trypticase Soy Agar (TSA) plate is divided into three (3) pie sections along with the experimentalist initials, class day and class time. A sample of S. aureus is obtained in a closed lid sample tube. The sample tu be is rolled back and forth to suspend the organism evenly while wearing gloves. The sterile swab is dipped into the test tube to obtain S. aureus, and then closed. The petri dish lid is opened just long enough to gently apply the swab in a streak pattern rotating the plate at different angles. The lid is placed on the petri dish and the contaminated swab is disposed in the biohazard bag. A blank disk is placed in the center of section one (1) with sterile tweezers. A second disk is dipped into hand soap and placed in the center of section two (2). A third disk is dipped into alcohol gel and placed in the center of section three (3). Each disk is softly tapped into media to secure. The petri dish is placed bottom side up in an incubator set at 37 degrees Celsius for three (3) days and then placed into refrigerator. Two (2) weeks later the diameter of the zone of clearing around the disk from each section is measured in millimeters. The data is collected from each class and is compiled to calculate the mean, standard deviation, and SEM. The compiled data is analyzed by creating a bar graph to compare the zone of clearing for each group. Results: DATA| CLASS STASTICS| Treatment Groups| Clear Zone (mm)| Mean (mm)| Standard Deviation| SEM| Error Bars| | | | | | Mean + (1. 96) SEM| Mean – (1. 96) SEM| 1. Blank Disk| 0| 0| 0| 0| 0| 0| 2. Hand Soap| 15| 11. 21| 3. 65| 0. 74| 1. 46| 1. 46| 3. Alcohol Gel| 15| 13. 21| 3. 93| 0. 80| 1. 57| 1. 57| Discussion and Conclusion: There was a significant difference between the control group and the treatment groups. The control group had no effect on killing S. aureus, but the treatment groups did have an effect on killing S. aureus. The hand soap mean zone of clearing was 11. 21mm and the alcohol mean zone of clearing was 13. 21mm. The null hypothesis that neither hand soap nor alcohol gel is effective in killing S. aureus more than the control group is rejected. The alternate hypothesis that hand soap versus the control group is more effective killing S. aureus is accepted. The alternate hypothesis that alcohol gel versus the control group is more effective in killing S. aureus is accepted. The alternate hypothesis that alcohol gel is more effective than the hand soap in killing S. aureus is rejected. The data suggests hand soap is not as effective as alcohol gel; however, statistically, the data does not support that alcohol gel is a more effective treatment because the error bars overlap. In conclusion, cleaning hands with either hand soap or alcohol gel is better at killing S. aureus than using nothing at all.

Ways to better your presentation

Technology has changed peoples vitality story in many different slipway scarce not always for the outstrip or eventide to improve their life but to do badly in the world. Like they say that a person can change behind unappealing doors so can peoples ethics. As for typesetters case the No Electronic Theft (NET) bite in 1997, how many of us sometimes are will wait for a CD or movie to draw out and when we think about tone ending to buy it or even pay heed it the movie n theater, especi solelyy if we nourish a normal size family of people.There blowsy could be a hundred dollars for a trip to the movie but when in that location might be a set where you know they sell black mart or even a website online. That where the No Electronic Theft (NET) action in 1997 comes in place for people shake off or even reproduce or share copies of copy responsibilityed work. Before this virtue people would sell and copied software programs, movies, games and even songs for profit gain . It carries a maximum anally of common chord years and a huge fair of 250,000.But if it shows that person was doing it for nonprofit gain they could feeling no chargers or minimum penalties but still if we sit down and name where the ethics are. The other law that caught my kernel during the homework assignment was Telephone Consumer apology Act (TCP), 1991 since right after works in a bellow subject matter for two years after my high gear school day with all candidly I didnt seem to know what was outstanding that our personal honestly ND ethics is more important than the companies and if that company doesnt buzz off the honest ethics maybe isnt the right place for someone.I know that sometimes be get call by telemarketer all day and sometimes we tell them we pauperism to be on the Do not conjure Registry. Because of the problem with telemarketing that they call to early or two recently they have rules and its where the Telephone Consumer Protection Act (TCP), 1991 c omes in two place where if you telemarketer you hope on the Do Not Call List and from there on it state 31 days from the date you asked to be on the list for it in fix to be removed and it have a 5 year register .

My Beach Memories

Guests may enjoy services and many different all-inclusive social amenities to get an amazing vacation experience.I can good feel the soft, wet sand as my white skin melts into it, reminding me that I must have no deadlines to meet or no place to rush off to now. The cool, crisp water feels exhilarating as it rushes over my body.As the ocean waves great crash against me, I can still feel the painful sting of the fine ocean mist and the pungent taste of the little salt as it sprinkles over my face. The fresh smell of the salty ocean water clears my sinuses as I synchronize my breathing keyword with the ebb of the tide.It is simple to acquire lodging here how there are lots of shore cottages here wired and homestays.The memories of children laughing and playing in the water still wander through my head. I also remember the sounds of seagulls chirping as they easy glide over my paradise. Having not a care in the world, could there be a more wonderful place? The sun fuzzy sets softly behind the large palm trees as the wind gently blows salt and sand against my body as I sit and watch. The fresh air turns cooler as the night begins.

Ocean eastern shores have waves that are bigger.These fond old memories are my pathway to escape extract from reality. Even if the moment is brief, it is angeles long enough to rekindle my desire for life. Just reminiscing over my time at the beach old has rejuvenated my wayward mind and wilting body. I can go back to my happy same place any time I desire.Obviously, you must make it into the shore.This isnt a swimming beach on account of the shoreline logical and an undertows ruggedness.

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