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Register a new userSkeletal and Dento -Alveolar Changes During Treatment of Class II Malocclusion with Fixed Appliances and Combined with the Distal Jet
التغيرات الهيكلية و السنخية السنية الناتجة عن معالجة حالات سوء إطباق من الصنف الثاني باستخدام الأجهزة الثابتة و بالمشاركة مع جهاز Distal Jet
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يعد إرجاع الأرحاء العلوية إلى الوحشي إحدى الطرائق المهمة لتأمين مسافات أو لتصحيح علاقة الصنف الثاني السنية في الفك العلوي. ظهر في المدة الأخيرة جهاز Distal Jet بهدف دفع الأرحاء العلوية إلى الوحشي في إطار معالجات سوء الإطباق من الصنف الثاني، و هو عبارة عن جهاز ثابت لا يعتمد على تعاون المريض.
Distalizition of the upper first Molar is a common treatment modality and very important method to correct Distal Malocclusion, or to create Spaces in the upper arch. The Distal Jet has recently been proposed to distalize maxillary molars in Class II cases with no need for patient cooperation.
References used
Bass NM.: The use of extra-oral traction in current orthodontics. Orthodontist 1970;2:11-15
Baumrind S, Korn EL, Isaacson RJ, West EE, Molthen R.: Quantitative analysis of the orthodontic and orthopedic effects of maxillary traction. Am J Orthod 1983;84:384-93
Bolla E, Muratore F, Carano A, Bowman J.: Evaluation of Maxillary Molar Distalization with the Distal Jet: A Comparison with other ContemporaryMethods. Angle Orthod. 2002; 72, 5, 481-494
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Class II malocclusion is a common clinical problem among white Caucasian population and its transverse component is a critical aspect of a functional and stable occlusion. The size and shape of the arches have considerable implications in orthodontic
diagnosis and treatment planning, affecting the space available, dental esthetics, and stability of the dentition. Hence , it is important to study the alveolar arch width in this group of patients using the wide possibilities of cone beam computed tomography of evaluating real anatomy , true-to-scale images without distortions or superimpositions, and the selection of the desired sections.Objective:To evaluate the width of maxillary and mandibular alveolar arches in skelatal Class II adults compared to skeletal class I using cone beam computed tomography. Materials and methods: thirty-two subjects with skeletal Class II relationship and 10 subjects with skeletal Class I who were ordinary undergoing CBCT scan for non-orthodontics nor for otorihnolaryngology purpose were selected to measure the maxillary and mandibular alveolar width of first premolar and first molars.Independent samples’ t-test was calculated. Results:No statistically significant differences were found of alveolar widths between skeletal Class II and Class I subjects in both maxillary and mandibular widths of molar and premolar regions. Gender had no statistically significant effect in the results of the study. Conclusion :There is no differences in alveolar width between adults with skeletal Class II and Class I relationships, so the transverse discrepancy in skeletal Class II when exsists , it is more probably not originated from the alveolar base.
The aim of this study was to investigate the relationship
between cervical vertebral posture in patients with skeletal Class II
malocclusion by using lateral cephalometric radiographs were taken
by natural head position.
Orthodontic treatment is considered successful only if optimal esthetic and
function are achieved.The objective of this study was to compare facial soft tissue profile changes
produced by a new technique (elastic forces based on skeletal anchorage
mini-plates) with changes
produced by conventional class-II elastic forces.
Objective: The aim of this study was to determine palatal and maxillary arch width
changes during MBT PEA with maxillary first premolars extraction treatment in patients
with Class II division 1 malocclusion.
Material and Methods: Dental casts of
24 Class II division 1 patients (8 males and 16
females) were evaluated. The minimum age of the subjects at the beginning of treatment
was above 16 years with mean age 02.02± 2.82. All patients were treated with extraction of
the maxillary first premolars and MBT PEA. Pre- and post-treatment maxillary and palatal
(inter-canine and inter-molar) widths were measured using a digital calliper of 0.01
accuracy. Paired samples t-test was used to evaluate the treatment changes within total
sample and within males group and females group. Differences between males and females
were tested using independent samples t-test.
Results: At the end of treatment, maxillary and palatal inter-canine widths increased
significantly (P>0.001).The maxillary inter-molar width increased but the values were
statistically insignificant (P<0.05). The palatal inter-molar width increased significantly
(P>0.01). No significant differences were observed between males and females.
Conclusions: Class II division 1 patients treated with extraction of maxillary first
premolars had tendency for an increase in palatal and arch width during treatment except
maxillary inter-molar width. It seems that a more thorough assessment and investigation
including pretreatment arch shape and factors related to anchorage should be carried out.
The purpose of this comparative study was to evaluate the correlation between
two radiographic methods used to evaluate skeletal maturation, hand-wrist analysis method and cervical
vertebrae analysis method.
Within the limits of this study, the ce
rvical vertebrae maturation method might mislead the
clinician when treating adolescent skeletal Class II patients at the pubertal growth spurt since it is not
correlated with hand wrist skeletal maturation method.
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