Treatment Of Angle Class Research Articles

Abordagem precoce da má oclusão de Classe II esquelética com atresia maxilar e mordida aberta anterior e o uso de alinhadores ClearCorrect – relato de caso

Adequate planning and early treatment of Angle Class II malocclusion with maxillary atresia and anterior open bite provides harmonization of maxillomandibular bone bases in the three planes of space. Orthodontic aligners have emerged as an alternative treatment having the following advantages: being more aesthetic and more comfortable for the patient, less treatment time when they are correctly indicated, less chairside time, less complications, possibility of remote monitoring, easier feeding, and dental hygiene. On the other hand, they offer difficulties to treat adults with severe skeletal Class II malocclusions, posterior crossbite and anterior open bite. Therefore, the objective of this clinical case report is to early correct skeletal Class II malocclusion with maxillary atresia through the use of mechanical orthopedics and devices that help eliminate habits and close the anterior open bite, and later the use of orthodontic aligners to finish the treatment. It was concluded that the early interceptive treatment of malocclusion was efficient to harmonize the bone bases in the anteroposterior, vertical, and transversal directions, changing this malocclusion from high to low complexity and, consequently, highly predictable and with an excellent prognosis for treatment with orthodontic aligners. The treatment with ClearCorrect aligners corrected the occlusion in a shorter period of time when compared to corrective orthodontics and with a high predictability in relation to the virtual setup.

Treatment of Angle class I malocclusion with severe crowding by extraction of four premolars: A case report

Aims: To correct the Angle class I malocclusion with crowding via four premolar extractions.Presentation of case:A 19-year-old Malaysian female presented with the bimaxillary protrusion, crowding, high canines, midline deviation and edge-to-edge anterior bite. Upper lateral incisors were palatalized and in crossbite interactions with the opposite teeth.Discussion: Treatment was initiated using fixed orthodontic appliances followed by four 1st premolar extractions in both arches. Case was finished with good inter cuspation of the upper and lower teeth. Molars were finished in a Class I relationship with canine guidance, and ideal overjet and overbite were obtained.Conclusion: Successful finishing of a case with beautiful smile, obtained proper overjet and overbite, corrected cross bite, midline shifting and the improved soft tissue profile.Bangladesh Journal of Medical Science Vol.17(4) 2018 p.683-687

Clinical Implications of Preformed Archwire Selection on the Treatment of Angle Class I/II division 1 Malocclusions in Thais.

The dental arch forms were compared of untreated Class I and Class II div 1 malocclusions to those of non-customized preformed archwires manufactured by American Orthodontics, G&H, Highland, Ormco, RMO, and 3MUnitek. Arch forms of post-treatment Class II div 1 malocclusions treated by four 1st premolar extractions are also compared. Four metrics of archform shape and size (canine and 1(st) molar depth and inter-canine and inter 1(st) molar width) were measured on dental casts of 40 Class I and 22 Class II div 1 patients. These same metrics were also used to describe preformed archwire forms. Non-customized preformed wires all showed significantly narrowed mandibular arch forms. This was true for maxillary archwires, with four exceptions. The Highland Natural Arch form, G&H True form I, and RMO natural preformed archwires showed both inter-canine and 1(st) molar widths statistically the same as mean dental arch widths in both the untreated and post-treatment Class II groups. In Class I patients, these three archwires showed only inter-canine widths equivalent to dental measurements. The Highland Progressive archwire matched only the 1(st) molar width in the untreated Class II group. None of these archwires - if used unadjusted, will produce a significant expansive force in either the maxillary or mandibular arch. Three maxillary non-customized preformed archwires showed both inter-canine and 1(st) molar arch widths statistically the same as Thai Class II div 1 dental arch dimensions. Using them to treat this malocclusion should minimally affect both pre and post-treatment maxillary arch form.

Treatment of Angle Class I Malocclusion with Severe Bimaxillary Protrusion using Miniscrew Implants and Periodontal Ligament Distraction

Treatment of Angle Class I Malocclusion with Severe Bimaxillary Protrusion using Miniscrew Implants and Periodontal Ligament Distraction

Observation of the clinical effect of MBT straight wire appliance in the treatment of patho-occlusion

Objective To investigate the clinical effect of the MBT straight wire technique for treatment of angle class Ⅱ 1 patho-occlusion.Methods 62 cases of adult class Ⅱ division 1 patients were randomly divided into the observation group (32 cases) and the control group (30 cases).The observation group was treated with MBT straight wire appliance therapy,the control group received the traditional straight wire appliance therapy.The two groups were given cephalometric film before and after treatment,and the clinical effect was observed and recorded.Results In the observation group,there were no significant differences in SNA,SNB,ANB,LI-MP,MP-SN after treatment compared with before treatment (t =0.46,0.73,0.24,1.05,P ＞ 0.05),while there were statistically significant differences in ANB,U1-SN,U1-L1 after treatment compared with before treatment (t =1.58,6.32,7.43,P ＜ 0.05).Before treatment 7 mm of openbite,OB 2 mm after treatment,returned to normal overbite and overjet,there was statistically significant difference(t =3.26,P ＜ 0.05).The mean treatment time was (22.0 ± 2.5) months in the observation group,it was significantly lower than(3 1.0 ± 3.8)months in the control group,there was statistically significant difference (t =7.47,P ＜ 0.05).After treatment,U1-SN,U1-L1 and OB in the observation group were significantly better than those of the control group,there were statistically significant differences(t =5.47,3.43,5.41,1.67,all P ＜ 0.05).Conclusion MBT straight wire appliance has the advantages of simple operation,accurate positioning of teeth,simplified correction procedure and short treatment time,it is worth the clinical promotion. Key words: Orthodontic appliances ,functional ; Touth abnormalities

Treatment of Angle Class I Malocclusion with Severe Bimaxillary Protrusion using Miniscrew Implants and Periodontal Ligament Distraction

Bimaxillary dentoalveolar protrusion is common in Asian population. In this patient with procumbent upper and lower lips, excessive lip strain, proclined and protruded maxillary and mandibular incisors with vertical growth pattern, an acceptable treatment result, was achieved with 4-first-premolar extractions. This case report is presented with the aim, to describe the treatment approach for bimaxillary dentoalveolar protrusion using miniscrew implants for anchorage in upper arch and periodontal ligament distraction for canine retraction in lower arch and then retraction of incisors into the newly formed bone distal to lateral incisor. Treatment was completed in 18 months. The patient profile was improved, with reduction in lip procumbency, decrease in lip eversion and protrusion, and decrease mentalis strain. Dentally, the interincisal angulation improved significantly because both the maxillary and mandibular incisors were uprighted after space closer.

Orthodontic movement of upper central incisor with fractured roots that are intraradicularly united with an endodontic instrument: A follow-up. Radiographic observations on root fractures

A patient under orthodontic upper first premolar extraction treatment of Angle Class II, Division 1, malocclusion suffered traumatic multiple fractures of the root of the maxillary right central in...

Variation with age of dental cephalometric variables in Class II, division 2 patients

The treatment of Angle Class II/2 malocclusion requires an understanding not only of the dental and maxillofacial features but also of the changes occurring with age in the dental relationships. This paper attempts to determine certain dental relationships in patients with Angle II/2 malocclusion and any changes that might occur with age. The study material included 96 lateral cephalometric X-rays of patients with Angle II/2 malocclusion, the youngest of whom was 7 years old and the eldest 35. Six cephalometric measurements were performed on every cephalometric X-ray. Statistical processing of data included one-variable analyses and correlations of two variables. Statistical one-variable analysis used methods from descriptive statistics. Methods of inferential statistics have been applied in order to revel statistical significance. The evaluation of the findings of this research study concluded that, in patients with Angle II/2 malocclusion, maxillary central incisors presented pronounced palatal tipping, which exacerbated significantly with age, while mandibular incisors displayed reduced labial tipping and projection, which significantly reduced with age. Furthermore, it was found that there was pronounced incisor overjet, which increased with age, due to increased protrusion of mandibular incisors.

Treatment of Angle Class II malocclusions with a newly modified bionator combined with headgear

The bionator is one of the most commonly used functional appliances in treating Angle Class II division 1 malocclusions. However, the original type of bionator often causes lower incisor flaring and is limited in cases with mild crowding. There is little published literature on treating Angle Class II division 2 malocclusions using bionators. Our group suggested some modifications to the original-type bionator, including addition of an anterior resin cap, upper and lower labial bows, an expansion screw and a posterior resin wedge, to attempt to overcome limitations of the original design. This article shows our results on two male patients, one with an Angle Class II division 1 malocclusion with a large overjet and the other with an Angle Class II division 2 malocclusion. The treatment was completed using a newly modified bionator with no other fixed appliance and resulted in a decrease in facial convexity, a reduced overjet and overbite, ideal interincisal relationships, and a harmonious profile.

Cephalometric Predictor Variables for Treatment of Class II Division 2 Malocclusions

To many orthodontists, it is clinically relevant to avoid extractions in the treatment of Angle's Class Ⅱ Division 2 (Class Ⅱ/2) malocclusions. The most commonly cited side effects from extraction treatment are a tendency toward flattening of the facial profile and deepening of the bite. The aim of this study was to select a model of cephalometric predictor variables for treatment decision-making for Class Ⅱ/2 malocclusions with premolar extraction versus non-extraction. The pretreatment lateral cephalograms and study models of 92 patients (46 boys and 46 girls) with a Class Ⅱ/2 malocclusion were analyzed. Discriminant analysis was applied to select pretreatment predictive variables for the treatment options. Stepwise variable selection of the cephalometric and model measurements at the first observation identified 5 predictive variables (p＜0.001). In order of significance, they are ANB, overjet (OJ), S to Go (S-Go), lower (L) arch-length discrepancy, and lower lip to the E-plane (L lip-E plane). The discriminant function generated was Dz = -0.5652(ANB) + 0.6271(OJ) + 0.4126(S-Go) + 0.6183 (L arch-length discrepancy) -0.3496(L lip-E plane). Using this discriminant function, a standardized score (Dz) ＞ 0 can roughly be translated into non-extraction treatment. For a score ＜ 0, extraction treatment can be assigned. The cutoff score for this function was Dz = 0. The group membership correctly classified was 83.7%. The majority of the misclassified patients were grouped around zero. This study showed that the discriminant function was dependent upon ANB, OJ, S to Go, lower arch-length discrepancy, and the lower lip to the E-plane in order to make an extraction decision for Class Ⅱ/2 malocclusions.

The effects of Frankel's function regulator (FR-4) therapy on the treatment of Angle Class I skeletal anterior open bite malocclusion

The present study attempts to evaluate cephalometrically the effects of Fränkel's function regulator (FR-4) appliance on the treatment of Angle Class I skeletal anterior open bite malocclusion. Forty Turkish children (26 girls and 14 boys), with Angle Class I skeletal anterior open bite, were randomly divided into two groups of 20 (13 girls and 7 boys). Patients who had not undergone treatment served as the control group, whereas a second group was treated with lip-seal training and the FR-4 appliance. Chronologic mean decimal age at initial period of the investigation was 8.7 years in the treated group, and 8.9 years in the control group. Treatment and observation periods were 2 years. Investigation was carried out on lateral cephalograms taken before and after the study period. The results indicate that a spontaneous downward and backward growth direction of the mandible observed in the control group could be changed to a upward and forward direction by FR-4 therapy. The skeletal anterior open bite was successfully corrected through upward and forward mandibular rotation. (A M J O RTHOD D ENTOFAC O RTHOP 1995;108:9-21.)

Dentofacial changes in children with negative overjet treated by a combined orthodontic and orthopaedic approach.

The intention of this study was to investiga$$$e whether any morphologic characteristics found at an early age are helpful in prediction of a good or poor response to early treatment of Angle Class III malocciusions, and to study the dento-alveolar and basal effects of combined retractor and chin-cap therapy. The data were obtained from lateral cephalometric radiographs of 51 children taken before treatment at an age of 4 to 9 years, after a treatment period of 5–18 months and about one and a half years after treatment. A group of children with a normal maxillo-mandibular relationship and a positive overjet was used as a control group. The pretreatment comparison revealed a more anterior position of the jaw angle, a more open angle, and a more acute chin prominence in the group that responded poorly to treatment. The differences between each of the two treatment groups and the control group were very similar. The treatment changes were approximately the same in the two treatment groups, but changes in the group with the good treatment response were more like the changes in the control group than in the group with poor results. Also during the observation period the changes were very similar in the two groups, and without exception indicated a relapse towards Class III morphology. The positive overjet and overbite were maintained in the group with good treatment results. The study does not indicate whether it is possible to maintain the good result throughout the rest of the growth period, but obviously a correct anterior occlusion is favourable for dento-alveolar compensation of unfavourable skeletal change.

Effects of orthopedic force on the treatment of Angle Class III

Effects of orthopedic force on the treatment of Angle Class III

Is a palatal bite plate advantageous in the treatment of angle class II malocclusions?

Is a palatal bite plate advantageous in the treatment of angle class II malocclusions?