The Measurement of Changes in the Angulation of Incisor Teeth During Orthodontic Treatment PDF Download
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Author: Donald T. Bennett
Publisher:
ISBN:
Category :
Languages : en
Pages : 195
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Author: Donald T. Bennett
Publisher:
ISBN:
Category :
Languages : en
Pages : 195
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Author: Brett C. Alvey
Publisher:
ISBN:
Category : Molar
Languages : en
Pages : 25
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Introduction: Proper root parallelism is an important goal of orthodontic treatment that allows for the best possible functional and esthetic result. Maxillary lateral incisors and second molars are two common teeth for which practitioners fail to achieve acceptable root parallelism. The aim of this study was to investigate angulation changes that non-parallel roots of maxillary lateral incisors and second molars undergo after orthodontic treatment. Methods: Records of 68 patients with angled roots of interest were analyzed immediately following orthodontic treatment, T1 (average age 16.1 ± 3.7 years) and at long-term follow-up, T [subscript] Latest (15.4 ± 4.5 years). Panoramic radiographs were used to measure the mesiodistal angulations of roots at both time points. Dental casts, lateral cephalometric radiographs, and patient demographic information were used to analyze factors that could be associated with interradicular angulation changes occurring between T1 and T [subscript] Latest. Results: On average, lateral incisors uprighted 4.79 ± 3.23 degrees, and second molars uprighted 5.52 ± 5.33 degrees. Gender (male) and age at T1 were significantly associated with incisor uprighting. Interradicular angulation at T1 and increased facial height were significantly associated with uprighting of both incisor and molar roots. Conclusions: On average, non-parallel roots of maxillary lateral incisors and second molars tend to upright after orthodontic treatment. Poor interradicular angulation at T1 and factors involving vertical facial growth leading to tooth eruption are associated with greater change. Despite angulation improvements on average, some patients did not experience favorable mesiodistal root angulation changes. Therefore, it is recommended that clinicians attempt to parallel roots during orthodontic treatment.
Author: Long Dao Tieu
Publisher:
ISBN:
Category : Bone resorption
Languages : en
Pages : 110
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When camouflaging Class II malocclusions, there are often changes to both the maxillary and mandibular incisor angulations that can lead to artificial elongation and/or foreshortening of the dental image. OIEARR is a common result of orthodontic treatment and given the inherent limitations of 2D radiography, it would be beneficial to better understand how changes of tooth angulation can alter the perceived root lengths. With this knowledge, clinicians may be better equipped at recognizing cases of true root resorption as opposed to cases where the appearance of root resorption on the radiograph is due to an imaging foreshortening. This information can help clinicians identify teeth that need further imaging (periapical) to confirm/assess severity of root resorption and will also allow clinicians to make modifications to their treatment in an attempt to minimize the progression of root resorption. Research Question 1. Critically evaluate incisor OIEARR in patients undergoing non-surgical treatment of Class II Division I malocclusion by systematic review of the published data. a.Current evidence suggests comprehensive orthodontic treatment to correct Class II malocclusion results in increased prevalence of OIEARR, however given the fact that there was no RCT and only limited prospective data included in this SR, the findings should be considered with caution. i.Prevalence ranged between 65.6%-98.1% ii.OIEARR -Per patient -- 65.6%-98.1% iii.OIEARR - Per tooth -- 72.9%-94.2% iv.Majority of teeth experienced mild-moderate resorption with severe resorption being reported to be between 6.25-17.2% v.No Sex difference was reported vi.No evidence that either the Mx CI or LI more susceptible to RR vii.Weak to moderate positive correlation between Tx duration and RR viii.Weak to moderate positive correlation between AP apical displacement and RR 2. What is the prevalence of OIEARR over the course of treatment in a selected sample of patients treated with either the X-bow for Forsus? a.Prevalence per tooth 65.3% b.Prevalence per patient 98.6% 3.What is the severity of OIEARR over the course of treatment in a selected sample of patients treated with either X-bow for Forsus? a.Per tooth -- None (34.7%); Mild (45.2%); Moderate (9.3%); Severe (11%) b.Per patient -- None (1.4%), Mild (32.9%); Moderate (30%); Severe (35.7%) 4.Are the incisor length measurements determined from panoramic radiographs accurate and reliable when maxillary and mandibular incisor angulations are modified in a custom made typodont? a.Under experimental conditions, Md incisors appear to respond as expected when compared to theoretical model (assumption -- teeth within focal trough) i.10 degrees -- 1.4% shorter ii.20 degrees -- 6.3% shorter iii. 30 degrees -- 13.4% shorter iv.40 degrees -- 23.7% shorter v.50 degrees -- 34.6% shorter b.Mx Incisors are more difficult to say. At some angulations yes (80, 90), at others (50,60, 70, 100, 110) the answer isn't clear c.Severe Resorption in clinical study was found in 11% of treated incisors and of the 25 patients with at least one tooth with severe RR, 20 of the cases were found on the Md arch 5. When several cephalometric variables are considered simulataneously over time, does sex and or treatment type affect the final outcome in a selected sample of patients treated with either X-bow or Forsus? a.No evidence of a Sex (p=0.840) difference in the overall pattern of cephalometric variables. b.No Evidence of a treatment type (p=0.395) difference in the overall pattern of cephalometric variables. c.Convincing evidence of a Time (p=0.006) difference in the overall pattern of cephalometric variables. d.Convincing evidence (p=0.019) that over the course of treatment OB was reduced by 1.79mm [1.66,1.92]. e.Convincing evidence (p=0.015) that over the course of treatment Y-Axis increased 1.3° [1.24,1.33]. 6.Additional Findings a.Shorter treatment length (p=0.037) with X-bow (24.18 months) compared to Forsus (30.17 months) b.Both compliance free Class II correction protocols (X-bow and Forsus) for the treatment of mild to moderate class II malocclusion appear to generate similar degrees of lower incisor proclination with similar variability. It appears than that foreshortening of the image on a panoramic radiograph due to proclination of lower incisors accounts for a small part, and the larger reason maybe due to the difficulties of accurately measuring the teeth due to distortion caused by the narrow focal trough size or superimposition.
Author: Konstantinos Bakos
Publisher:
ISBN:
Category :
Languages : en
Pages : 43
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Objective: The purpose of this study was to evaluate the maxillary central incisor position changes after orthodontic treatment in Class I, II and III malocclusions. Material and Methods: This retrospective cohort study evaluated nighty non extraction orthodontic Class I, II and III cases which were collected randomly from the Orthodontic clinic at the University of Alabama at Birmingham and the Institutional Review Board of the University of Alabama at Birmingham approved the study. All the chosen cases were treated with fixed appliances and according to the standards of American Board of Orthodontics. All the lateral cephalo-metric radiographs were taken using the Orthopantomograph OP100, Instrumentarium Corp.Imaging Division machine(Finland) and traced digitally using the Dolphin Management and Imaging Software, Version05.05.5070.221436(US &Canada). In order to evaluate the maxillary incisor position changes ,the U1-PP(°), U1-SNo, U1-NAo, U1-NA(mm), U1 perpendicular to FH mm(U1-FH) and U1-Oc° cephalometric measurements were carried out based on the post-treatment lateral cephalometric measurements. In order to determine if there is a statistically significant difference in Maxillary central incisor positions among class I, II and III malocclusions , equivalence tests for post-treatment cephalometric measurements were performed using a range of ± 2 either degrees or millimeters Results: The maxillary incisors position does show a significant difference from the normal value among the Class I, II and III. Class III malocclusion presented a greater proclination of maxillary incisor teeth compared to Class I and Class II malocclusions. Class I has a tendency to be more positive of the normal and Class II to be more negative than the normal. The maxillary incisors changes, seem to not fall within the range of ±2 mm according with the equivalent tests for post-treatment cephalometric measurements compared to the respective normal value. The final position of the maxillary incisors after orthodontic treatment depends mainly on the initial position of these teeth and the discrepancy of jaws. Conclusion: There is a significant difference in the positioning of the maxillary incisors among the class I, II and III malocclusions. The post-treatment measurements such as U1-FHmm, U1-NA mm and U1-SN° and U1-NA° present a significance difference among Class I, II and III malocclusions. In In the class II, the maxillary teeth showed to be more upright than Class I and III malocclusions after orthodontic treatment. The U1-PP° showed no significant difference among the malocclusions. In this study, the U1-PP° was the same for r the Class I and III.
Author: Luis E. Arroyo
Publisher:
ISBN:
Category : Cephalometry
Languages : en
Pages : 114
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Author: John J. Murray
Publisher:
ISBN:
Category : Dental schools
Languages : en
Pages : 220
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Author: Waino M. Kaihlanen
Publisher:
ISBN:
Category :
Languages : en
Pages : 80
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Author: Olin Edison Wyatt
Publisher:
ISBN:
Category :
Languages : en
Pages : 88
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Author: Nawaf A. Masri
Publisher:
ISBN:
Category :
Languages : en
Pages : 168
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Author: Fred F. Schudy
Publisher:
ISBN:
Category : Cephalometry
Languages : en
Pages : 440
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