Evaluation of the relationships between chronological age, skeletal maturation, dental maturation, and sagittal jaw relationships

Objective: The present study aimed to determine whether there is a correlation between chronological age, skeletal maturation, dental maturation, and ANB angle.Methods: Lateral cephalometric, panoramic, and hand-wrist radiographs of 200 orthodontic patients were used (100 males and 100 females; mean age 13.00 and 13.70 years, respectively). Skeletal maturation was determined by two different methods: cervical vertebral maturation (CVM) and the hand-wrist radiography method of Grave-Brown. Dental maturation was defined by the Demirjian Index using the mandibular canine, premolars, and second molar on the left side. The ANB angle was measured on lateral cephalometric head films. The data were analyzed by Spearman's rank correlation analysis.Results: Correlation coefficients of the male and female subjects were 0.825 and 0.802 between chronological age and hand-wrist evaluation; 0.744 and 0.778 between chronological age and CVM evaluation; 0.677 and 0.443 between chronological age and mandibular canine development; 0.722 and 0.458 between chronological age and mandibular first premolar development; 0.730 and 0.517 between chronological age and mandibular second premolar development; 0.701 and 0.531 between chronological age and mandibular second molar development; and -0.183 and -0.045 between chronological age and ANB, respectively. All the correlations mentioned above were statistically significant (p<0.001), except for the last one.Conclusions: High correlations were found between the chronological age, hand-wrist, and cervical vertebral maturation evaluations. Chronological age was also correlated with dental maturation, particularly in mandibular second molars. There was no correlation between ANB and the other parameters

Prevalence and characteristics of supernumerary teeth in a non-syndrome Turkish population : associated pathologies and proposed treatment

Objective: The objectives of the present study were to investigate the prevalence and characteristics of supernumerary teeth and evaluate the associated pathologies and treatment protocol in a Turkish patient population. Study design: A retrospective study was performed using full-mouth periapical and panoramic radiographs of 3491 patients (2146 females and 1345 males) ranging in age from 12 to 25. For each patient with supernumerary teeth we recorded the demographic variables (including age, sex), number, location, position, type, and morphology of supernumerary teeth, associated pathologies or complications, and whether any treatment has been carried out. The Pearson chi-squared test was used to determine potential differences in the distribution of supernumerary teeth when stratified by gender. Results: Supernumerary teeth were detected in 42 subjects (1.2%), of which 27 were males and 15 were females with a 1.8:1 male female ratio (P<.001). The most commonly found supernumerary teeth were mesiodens (31.3%) followed by premolar (25.0%), lateral (22.9%), distomolar (14.5%), paramolar (4.2%), and canine (2.1%). Of the 48 supernumerary teeth examined, 50.0% (n=24) were conical, 81.3% (n=39) were in a vertical position, and 20.8% (n=10) were erupted. Supernumerary teeth caused rotation or displacement of the adjacent teeth in 14 cases, and the impaction of the permanent teeth in 8 cases. Conclusion: The prevalence of supernumerary teeth in our series was found to be 1.2%, the most frequent type being mesiodens. Rotation or displacement of permanent teeth was the most frequent complication caused by supernumerary teeth

Early treatment of a class III malocclusion using mini maxillary protractor: A case report

Bu vaka raporu 12 yaşındaki Sınıf III maloklüzyona sahip bir hastanın tedavisini anlatmakta ve tedavi sonuçlarını tartışmaktadır. Hastaya pozitif overjet sağlanıncaya kadar apareyini günde en az 20 saat kullanması söylendi. Maksiller protraksiyon ile ön çapraz kapanış düzeltildikten sonra, Sınıf I kanin ve molar ilişkiyi sağlamak ve orta hat sapmasını düzeltmek için edgewise sabit mekanikleri kullanıldı. Maksiller protraksiyon için tedavi süresi 6 ay, toplam tedavi süresi ise 18 aydı. Maloklüzyonun düzeltilmesi hem iskeletsel hem de dişsel değişiklikler ile sağlandı.This case report describes the treatment of a patient aged 12 years with a Class III malocclusion using a modified maxillary protractor and discusses the results of the treatment. The patient was instructed to wear the appliance at least 20 hours a day until a positive overjet was achieved. After the overcorrection of the anterior crossbite with protraction therapy, edgewise fixed appliances were used to correct the midline discrepancy and to establish Class I canine and molar relationships. Treatment time for maxillary protraction was 6 months, and the total treatment time was 18 months. Correction of the malocclusion was accomplished with both skeletal and dental changes

Orthodontic intervention to impacted and transposed lower canines

WOS: 000400611100001PubMed ID: 28540090Impacted and transposed teeth cause serious difficulties in tooth eruption and movement as well as esthetic and functional outcomes. Proper treatment planning including good biomechanical control is essential in order to avoid side effects during traction and aligning of the impacted and/or transposed teeth. The purpose of the present study was to present a successfully treated female patient having transposed and impacted lower canines by means of a modified lingual arch and fixed orthodontic appliance. A female patient aged 13 years and 9 months presented to the orthodontic department with a chief compliant of bilateral spacing and missing teeth in mandibular dentition. After leveling and creating sufficient space in themandibular arch for the canines, a modified lingual arch was cemented to the mandibular first molars. The lingual arch had two hooks extending to the distobuccal areas of the canine spaces. Elastic chains were applied between the hooks on the lingual arch and the ligatures tied to the attachments on the canine crowns. The light forces generated by elastic materials caused impacted canines to erupt and tend towards their own spaces in the dental arch. As a result, impacted and transposed lower canines were properly positioned in their spaces, and the treatment results were stable during the retention period

Reply

We would like to express our thanks to Dr Duterloo for his interest in our study (1) entitled ‘Effects of maxillary protraction for early correction of class III malocclusion’ and his appreciation of our efforts. considered the most reliable and precise method for facial superimpositions (2)

Effects of maxillary protraction for early correction of class III malocclusion

WOS: 000330836700012PubMed ID: 23460730This prospective study investigated the skeletal, dental, and soft-tissue effects of a mini maxillary protractor appliance in class III subjects with maxillary retrusion and mandibular protrusion and compared these changes with those of untreated, well matched control sample with normal occlusions. Twenty patients with class III malocclusion (mean age 11.10.8 years) and 20 subjects with normal occlusion (mean age 10.90.4 years) were included to this study. The class III subjects were treated with the mini maxillary protractor appliance, and the others were used as control subjects. Paired t-test and Students t-test were used to determine the within- and between-group differences, respectively. In the study group, the maxilla moved forward (SNA, 2.0 degrees and AY, 2.4mm) (P 0.05). The mandible displaced backwards and downwards (SNB, 1.1 degrees; SND, 0.9 degree; BY, 0.9mm and PogY, 0.3mm; P < 0.001). These movements in the maxilla and mandible caused a significant improvement in intermaxillary sagittal relationship (ANB, 3.0 degrees; Convexity, 6.3 degrees; Wits, 4.6mm; P < 0.001). The maxillary incisors moved forward (2.2 degrees) while the mandibular ones backward (1.9 degrees). The improvement in overjet was 5.0mm, and 66.1 per cent of this change (3.3mm) was skeletal (AY; 2.4mm and BY; 0.9mm), and the remaining (1.7mm) dentoalveolar (U1NA; 0.9mm and L1-NB; 0.8mm). The change in LsE measurement was more in the study group (2.1mm), and the difference between the groups was statistically significant (P < 0.001)

Effects of the functional regulator III on profile changes in subjects with maxillary deficiency

WOS: 000284638800023PubMed ID: 20453006The results of the Student's t-test showed that the treatment group had a concave facial profile when compared with the controls. At the end of treatment, the maxilla and surrounding soft tissues showed significant anterior movement (P < 0.001 and P < 0.01, respectively), whereas mandibular growth was restricted. The vertical dimensions increased, the upper incisors proclined, and the lower incisors retroclined significantly (P < 0.001). The FR-3 appliance produced significant improvements in the hard and soft tissues of Class III subjects with a concave profile

Effects of force magnitude on relapse: An experimental study in rabbits

Introduction: The aims of this study were to investigate the effects of 2 force levels on the amount of relapse and to determine whether there is a relationship between the rates of tooth movement and relapse. Methods: Approximately 20-g (group I) and 60-g (group II) forces were applied to the maxillary central incisors of 25 young adult (14 weeks of age) New Zealand female rabbits. Active tooth movement lasted 20 days. Then, the appliances were removed, and the incisors were released. The distance between the incisors was measured daily from the midlevels of the crowns by using a digital caliper during the active phase of tooth movement for 20 days, and then relapse was measured at the same level for 37 days. Analysis of variance and the Bonferroni multiple range test were used for statistical analyses. Results: After active tooth movement, the mean total opening amounts were 3.98 ± 0.59 mm in group I and 4.82 ± 0.82 mm in group II, and the mean difference was approximately 0.8 mm. A rapid relapse was observed on the initial days in both groups, and its rate decreased with time. Significant relapse was observed in the first 5 and 8 days of the experiment in 20-g and 60-g force groups, respectively. The relapse in group II was significantly greater than in group I only on the first day of experiment. Statistically significant correlations were found between total tooth movement and relapse (R = 0.896, P <0.001). Conclusions: These results showed a close relationship between the amount of relapse and orthodontic force magnitude. Greater relapse occurred during the initial days after appliance removal, and this indicates that retention appliances are needed immediately after the removal of orthodontic appliances

Erken sınıf 3 malokluzyonun buño apareyi ile tedavisi

Skeletal Class III malocclusion is one of the most challenging, complex and difficult problems to treat. Functional orthopedic appliances can produce favorable outcomes during early mixed dentition in cases with Class III malocclusion. The purpose of this case report was to present a successfully treated 8-years-old female patient having skeletal Class III malocclusion due to maxillary retrusion by means of a simple Class III corrector, the bimaxillar prognathism upper plate according to Buño.İskeletsel Sınıf III malokluzyon tedavisi en zor ve karmaşık problemlerden biridir. Fonksiyonel ortopedik apareyler erken karışık dişlenme dönemimdeki Sınıf III malokluzyonlu vakalarda olumlu sonuçlar oluşturabilir. Bu vaka raporunun amacı, maksiller retrüzyona bağlı olarak gelişen iskeletsel Sınıf III malokluzyonlu 8 yaşındaki bir kız çocuğunun basit bir Sınıf III düzeltme apareyi (“Buno apareyi) ile başarılı şekilde tedavisini göstermektir