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Register a new userThe Effectiveness of Laceback Ligatures on Upper Incisor and Anchorage
دراسة تأثير رباط ال Laceback في القواطع العلوية و الإرساء
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Damascus University ورقة بحثية
Publication date
2010
fields
Dentistry
and research's language is
العربية
Created by
Shamra Editor
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هدف هذا البحث إلى تقييم تأثيرات رباط ال Laceback في المستويين الأمامي الخلفي و العمودي على القواطع العلوية، فضلاً عن تأثيره في الإرساء خلال مرحلة الرصف و التسوية لدى معالجة حالات الصنف الثاني نموذج أول التي تحتاج إلى إجراء قلع ضواحك أولى علوية في سياق المعالجة التقويمية. صممت هذه الدراسة على شكل دراسة عشوائية مع وجود مجموعة مراقبة RCT) Randomized controlled trial.
The purpose of this study is to evaluate the effects of laceback ligatures on the anteroposterior and vertical position of the upper incisors and the mesial position of the upper first molars during the alignment and leveling stage of orthodontic treatment of Class II Division 1 cases which require extraction of upper first premolars. This study was Randomized controlled trial (RCT).
References used
Proffit W R, Fields H W, Ackerman J L, Thomas P M, and Tulloch J.F. C. Contemporary orthodontics. C.V Mosby Co, 1986
AndrewsLF. The Straight-wire appliance: origin, controversy, commentary. J Clin Orthod 1976;10:174-195
AndrewsLF. The Straight-wire appliance: Explained and Compared. J Clin Orthod 1976;10:174-195
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Arch length preservation, and maintenance of the leeway space in the mixed dentition can often provide an adequate space to resolve lower incisor crowding. Yet, the frequency of this occurrence is not known. To obtain this information, lingual arches
were placed in the mandibular arches of 107 consecutive mixed dentition patients with incisor crowding to preserve arch length and make the leeway space available to resolve the crowding. Arch length decreased by only 0.44mm, whereas the intercanine, interpremolar, and intermolar dimensions increased by0.72-2.27mm. There was an adequate space to resolve the crowding in 65 out of 107 patients(60%). If perfect arch length preservation occurred, there would bean adequate space to resolve the crowding in 73 out of 107 patients(68%)
The research aim for testing the correlations between the morphology of the bone around the apexes of the central incisors and facial type.the sample consist of 59 patient.They were divided into three groups according to their facial Type.the result
is three groups ,19 short face type, 20 norm face type, and 20 long face type patients, aged 19 to 40 years.we have measured many measurement that determine the relationship between the apex of central upper incisor and its surroundings. The measurements were processed using analysis of variance Anova and Mann-Whitney U-tests and (Correlation coefficient )r .We find that at the upper central incisors, In short face type subjects the root apex of the upper central incisors was farther away from the lingual cortex than in the norm face type and long face type. In long face type subjects the root apex of the upper incisors was farther away from the palatal plane than in the norm face type and long face type.
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Lower incisor crowding ( L.I.C ) is identified as the
discrepancy between mesiodistal tooth widths of four permanent
incisors and available space in the alveolar process. However,
incisor crowding is not merely a tooth-arch size discrepancy. Many
factors such as incisor inclination can be affect crowding
development.
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crowding on maxillary and mandibular incisor position in the early
mixed dentition.
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Plus) Sealant. The sealed teeth were thermocycled then coated with
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the sealant margins and then immersed in 1% methylene blue for 24
hours. Each tooth was sectioned bucco-lingually and examined with
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microleakage, and penetration ability.
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