Top PDF Clinical effects of fixed functional Herbst appliance in the treatment of class II/1 malocclusion

Clinical effects of fixed functional Herbst appliance in the treatment of class II/1 malocclusion

Clinical effects of fixed functional Herbst appliance in the treatment of class II/1 malocclusion

Case outline A 13-year-old girl was referred to the Clinic of Orthodontics, School of Dentistry in Belgrade following previous unsuccessful treatment of her skeletal Class II malocclusion using an activator. The patient’s poor cooperation had led to failure of the treatment. Patient was subjected to the Herbst treatment for 6 months followed by fixed appli- ance for another 8 months. Lateral cephalograms before and after the treatment was performed. The remodelation of condylar and fossal articulation was assessed by superimposition of pre- and post-treatment temporomandibular joint tomograms. The promotion of oral hygiene and fluoride use was performed because orthodontic treatment carries a high caries risk and risk for periodontal disease. Skeletal and dental changes were observed after treatment (correction [Max+Mand]: molar relation 7 mm, overjet 8 mm, skeletal relation 5 mm, molars 2 mm, incisors 3 mm). Combination of Herbst and fixed appliances was effective in the treatment of dental and skeletal irregularities for a short period of time. Conclusion In the retention period, 14 months after treatment, occlusal stability exists. Follow-up care in oral preven- tion is based on regular recalls at the dental office and supervision at home by the parents.
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Dental Press J. Orthod.  vol.16 número5 en a06v16n5

Dental Press J. Orthod. vol.16 número5 en a06v16n5

Objective: This prospective clinical study evaluated dentoskeletal changes in Class II malocclusion patients after treatment with the Twin Block functional appliance (TB). Method: The sample was divided into two groups with 19 subjects in each: Group TB, with mean age of 9 years and 6 months (sd = 10 months); and a control group, with mean age of 9 years and 9 months (sd =13 months), both situated before the pubertal growth spurt. Unpaired Student’s t test showed the sample homogeneity at the begin- ning of the study. Initial (T1) and one year follow-up (T2) cephalometric radiographs were obtained for all subjects. Wilcoxon test and Mann-Whitney test were used to evaluate changes intra and intergroups from T1 to T2. Results: A Class I molar relation- ship was achieved in 15 subjects of the TB group, while no modification occurred in the control group. No significant effect was observed either in the maxilla or in the vertical pattern. A significant increase in total mandibular length and an anterior displacement of the mandibular position occurred in the treated group (p<0.05) as well as an overjet reduction, influenced by significant upper incisor retroclination and lower incisor pro- clination (p<0.05). Conclusions: Class II treatment with the Twin Block appliance in Brazilian patients showed skeletal and dental effects, including increase in mandibular length and incisors compensation, respectively.
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Dental Press J. Orthod.  vol.16 número6 en a10v16n6

Dental Press J. Orthod. vol.16 número6 en a10v16n6

This is an uncontrolled, non-randomized clinical trial conducted on a sample comprising 56 lateral cephalograms (28 initial and 28 final cephalograms) of 28 Brazilian patients with An- gle Class II, Division 1 malocclusion, 12 males and 16 females, mean age of 13.06 years at the beginning of treatment, who were treated for a mean period of 14.43 months with mandibular protraction appliances (MPA) associated with fixed orthodontic appliance. All patients were treated at the private practice of Professor Car- los Martins Coelho Filho in São Luís, Maranhão State, Brazil. The following inclusion criteria were adopted: Angle Class II, Division 1 maloc- clusion with mandibular retrognathism, as as- sessed by photographs, study models, in addition to cephalograms that allowed clear visualization of the structures of interest. Sample exclusion criteria were: Patients who had agenesis, extrac- tion or missing permanent teeth, cases of Angle Class II, Division 1 treated only with MPA, pa- tients with pronounced overjet.
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Estudo longitudinal das alterações dentoesqueléticas à longo prazo da má oclusão de classe II, divisão 1ª tratada com o Bionator de Balters utilizando-se a cefalometria radiográfica e a morfometria geométrica

Estudo longitudinal das alterações dentoesqueléticas à longo prazo da má oclusão de classe II, divisão 1ª tratada com o Bionator de Balters utilizando-se a cefalometria radiográfica e a morfometria geométrica

Cephalometric records of 23 white patients (15 females and 8 males) with Class II division 1 malocclusion with mandibular retrusion determined by cephalometric analysis of Ricketts et al. 32 and Schwarz, modified by Faltin et al., 33 consecutively treated with the Balters bionator (BG group; Figure 1) were collected from a single orthodontic practice (Kurt Faltin Jr.) The treatment protocol consisted of a bionator, constructed without coverage of the lower incisors, to be worn 16-18 hours a day and followed by approximately 1 year of fixed appliance therapy to refine occlusion. Those patients still in the mixed dentition phase by the end of bionator treatment were instructed to wear the appliance only at night until complete eruption of the premolars and permanent canines. After the comprehensive phase of treatment, each patient was given a lower incisor fixed retainer. Lateral cephalograms were obtained at three time periods: T0, at the start of treatment; T1, at the end of bionator therapy; and T2, at long-term observation after completion of growth, 34 including the phase with fixed appliances. Patient compliance and treatment success were not considered as inclusion criteria so that sample selection was conducted irrespective of clinical results.
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Dental and skeletal components of Class II open bite treatment with a modified Thurow appliance

Dental and skeletal components of Class II open bite treatment with a modified Thurow appliance

The ability to distinguish between skeletal/dental contributions and correction is important not only to ensure that treatment objectives were met, but also to further improve therapies performed with the ap- pliance. Clinically, understanding the effects of Thu- row high-pull headgear is vital to understand Class II correction in growing hyperdivergent patients. The aim of this retrospective study was to assess den- tal and skeletal changes produced by a Thurow high- pull headgear appliance for hyperdivergent patients with open bite and Class II division 1 malocclusion, by means of cephalometric radiographs.
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Dental Press J. Orthod.  vol.15 número1

Dental Press J. Orthod. vol.15 número1

Objectives: The purpose of this study was to compare the occlusal outcomes and the treat- ment time of Class II malocclusion with the Pendulum appliance and with two maxillary premolar extractions. Methods: For this, 48 Class II malocclusion patients were selected and divided into two groups according to the treatment protocol: group 1 consisted of dental study casts and initial cephalograms of 22 patients treated with the Pendulum appliance, with an initial mean age of 14.44 years and group 2, comprised of dental study casts and initial cephalograms of 26 patients treated with two maxillary premolar extractions and a initial mean age of 13.66 years. The occlusal outcomes were evaluated on dental casts with the PAR occlusal index and the treatment time of each group was calculated by the clinical records. The variables were compared by the t tests. Results and conclusions: The results demonstrated that the occlusal outcomes were similar between the groups, however, the two maxillary premolar extractions protocol provided occlusal outcomes in a shorter treatment time than the Pendulum treatment.
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Dental Press J. Orthod.  vol.18 número5

Dental Press J. Orthod. vol.18 número5

Objective: The objective of this study was to evaluate dentoskeletal effects in the treatment of Class II malocclusion performed with the Herbst appliance in patients at post-peak stage of growth. Methods: The sample consisted of 16 patients with Class II malocclusion and average initial and final ages of 14.04 (ranging from 11.50 to 35.66) and 17.14 (ranging from 13.68 to 38.64) years, respectively, who were treated for an mean time of 2.52 years. Lateral cephalograms were obtained at treatment onset (T 1 ) and completion (T 2 ) to evaluate the effects of therapy. Initial dental casts were also used to evaluate the overjet and the anteroposterior severity of molar relationship at treatment onset. The cephalometric changes between initial and final stages were compared by means of the non-parametric Wilcoxon test. Results: The results showed that the Herbst appliance did not promote significant changes in the maxillary component and the effective length of the mandible significantly increased without improving the maxillomandibular relationship. Changes in the maxillary and mandibular dentoalveolar components revealed that the maxillary incisors exhibited retrusion and lingual tipping, while the mandibular incisors presented increased protrusion and buccal tipping. The dental relationships exhibited significant improvements with the treatment. Conclusion: Based on the present results, it was concluded that the effects of treatment performed with the Herbst appliance in patients at post-peak stage of growth are predominantly of dentoalveolar nature.
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Dental Press J. Orthod.  vol.18 número4

Dental Press J. Orthod. vol.18 número4

Introduction: This article demonstrates the description and use of a new appliance for Class II correction. Mate- rial and Methods: A case report of a 10-year 5 month-old girl who presented with a skeletally-based Class II divi- sion 1 malocclusion (ANB = 6.5°) on a slightly low-angle pattern, with ML-NSL angle of 30° and ML-NL angle of 22.5°. Overjet was increased (7 mm) and associated with a deep bite. Results: Overjet and overbite reduction was undertaken with the new appliance, Fixed Lingual Mandibular Growth Modificator (FLMGM). Conclusion: FLMGM may be effective in stimulating the growth of the mandible and correcting skeletal Class II malocclusions. Clinicians can benefit from the unique clinical advantages that FLMGM provides, such as easy handling and full integration with bracketed appliance at any phase.
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UNIARARAS – Fundação Hermínio Ometto, Araras, SP, Brasil

UNIARARAS – Fundação Hermínio Ometto, Araras, SP, Brasil

Objective: This study was designed to evaluate the skeletal, dental and soft tissue effects of mandibular deficiency treatment with the mandibular protraction appliance (MPA) using 12 factors of the Ricketts analysis. Material and method: This cross-sectional retrospective study sample consisted of a group (n = 27), with Class II malocclusion, convex facial profile, increased horizontal trespass and mandibular deficiency, with initial mean age of 12.27 and final of 15.18 years, treated with fixed appliance combined with the MPA, in an average time of 2.9 years. Initial and final radiographs were investigated using Ricketts analysis. The dependent t-test was used to compare the initial and final phases of the MPA group, with a significance level of 5%. Result: Statistically significant differences were observed for dental changes such as retrusion (p=0.000) and palatal inclination of the maxillary incisors (p=0.000); protrusion (p=0.000) and buccal inclination of the mandibular incisors (p=0.000); increased interincisal angle (p=0.002) and improved molar ratio (p=0.003). There was also a restriction of the anterior displacement of the maxilla (p=0.000) and a decrease in the mandibular plane angle (p=0.024). The variable inferior labial protrusion with significance (p=0.000), reiterated the improvement in the profile. Conclusion: The effects of MPA on correction of malocclusion Class II, verified by Ricketts analysis occurred predominantly by dentoalveolar changes, decrease in the Mandibular Plane Angle, and restriction of anterior displacement of the maxilla, which contributed to the improvement in the patient’s profile. Descriptors: Angle class II malocclusion; functional orthopedic appliance; mandibular advancement.
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Changes in temporomandibular joint disc position and form following Herbst and fixed orthodontic treatment

Changes in temporomandibular joint disc position and form following Herbst and fixed orthodontic treatment

Thirty-two white Brazilian adolescents (16 boys and 16 girls) with Angle Class II division 1 malocclusion and mandibular retrognathism were selected consec- utively for treatment. Mean pretreatment age of the subjects was 12.8 6 1.2 year (range, 10.9 to 15.8 years). Selected characteristics of the patients are presented in Table 1. The Research Ethical Committee from the Federal University of Sa˜o Paulo analyzed and approved the research project on June 12, 2000. All patients and guardians signed an informed consent form. Patients enrolled in the study showed the following characteristics:
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Dental Press J. Orthod.  vol.19 número1

Dental Press J. Orthod. vol.19 número1

Objective: To assess the dentoskeletal changes observed in treatment of Class II, division 1 malocclusion patients with mandibular retrognathism. Treatment was performed with the Herbst orthopedic appliance during 13 months (phase I) and pre-adjusted orthodontic fixed appliance (phase II). Methods: Lateral cephalograms of 17 adolescents were taken in phase I onset (T 1 ) and completion (T 2 ); in the first thirteen months of phase II (T 3 ) and in phase II completion (T 4 ). Differences among the cephalometric variables were statistically analyzed (Bonferroni variance and multiple comparisons). Results: From T 1 to T 4 , 42% of overall maxillary growth was observed between T 1 and T 2 (P < 0.01), 40.3% between T 2 and T 3 (P < 0.05) and 17.7% between T 3 and T 4 (n.s.). As for overall mandibular move- ment, 48.2% was observed between T 1 and T 2 (P < 0.001) and 51.8% between T 2 and T 4 (P < 0.01) of which 15.1% was observed between T 2 and T 3 (n.s.) and 36.7% between T 3 and T 4 (P < 0.01). Class II molar relationship and overjet were properly corrected. The occlusal plane which rotated clockwise between T 1 and T 2 , returned to its initial position between T 2 and T 3 remaining stable until T 4 . The mandibular plane inclination did not change at any time during treat- ment. Conclusion: Mandibular growth was significantly greater in comparison to maxillary, allowing sagittal maxil- lomandibular adjustment. The dentoalveolar changes (upper molar) that overcorrected the malocclusion in phase I, partially recurred in phase II, but did not hinder correction of the malocclusion. Facial type was preserved.
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Dental Press J. Orthod.  vol.17 número6

Dental Press J. Orthod. vol.17 número6

The correction of Class II malocclusion with FR-2 presented statistically significant values, as the final score obtained in stage T 3 , averaged 2.49 (Table 3), especially considering that no fixed orthodontic treatment was held after orthopedic treatment. By examining the TPI index obtained at the end of orthopedic treatment, it is verified that much of the achieved correction is due to improvement of the molar relationship, overjet and overbite. This fact was already expected, since the use of the orthopedic appliance really aims at the correction of malocclusion, especially in the sagittal direction and, secondarily, in the vertical direction. At this stage (T 2 ), 73% of patients had an overjet between 2 and 4 mm (normal rate) and only 27% showed a horizontal overlap greater than 5 mm. These patients were probably those who at baseline had a horizontal overlap greater than 9 mm, i.e., very severe. Also, 73% of patients had normal vertical relationship at the end of orthopedic treatment, and only 27%, an overbite between 1/3 and 2/3 of the crown of the lower incisor. This demonstrates the degree of occlusal correction only using FR-2.
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Analysis of quality and cost of FeSiMg treatment master alloy vs. cored wire in production of ductile cast iron

Analysis of quality and cost of FeSiMg treatment master alloy vs. cored wire in production of ductile cast iron

The PE technique is applicable to both cupola- and electric- furnace- melted iron. Investigations of the cupola process carried out at two domestic foundries in parallel with investigations of the efficiency of equipment for cast iron nodularising treatment have proved full applicability in production of ductile iron of both these installations operating in foundries. Over the past 13 years, the PE technique of the cast iron treatment has roused vivid interest of the Polish foundry industry and has been implemented, among others, in several domestic foundries, the Department of Alloys and Composites Casts Engineering at the (AGH) University of Science and Technology being responsible for implementation of this process in at least 13 foundries. For production of ductile iron in the above mentioned foundries, the technique of cored wire was used to treat the batches of molten metal in ladles ranging in capacities from 0,15 to 10 Mg.
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CONTINUOUS CREATION IN THE PROBABILISTIC WORLD OF THE THEOLOGY OF CHANCE

CONTINUOUS CREATION IN THE PROBABILISTIC WORLD OF THE THEOLOGY OF CHANCE

I think we can answer this question in the positive: Yes, He can, because He is the most perfect being and His omnipotence is absolutely unlimited. A very important premise underlying the answer to the last question is that the risk is not so great, or even that it is very small. It is so because the nature and mechanism of the created world ensure with a very high proba- bility that all purposes intended by God will be attained without his causal action in the processes occurring in the world. The emergence of life in the universe is almost inevitable, because the universe is large and old enough, and biochemical mechanisms are very effective. The emergence of sentient beings was also almost inevitable because of longstanding and countless mutations and adaptations of living organisms to their environment. All this was very probable and hence in a sense necessary (inevitable). The great advantage of the non-deterministic world is its own creativity, which is possible because of the chance events happening in a way restricted only by the laws of nature. Thus, if one evolutionary path fails another one is opened. Perhaps a mutation suitable for the growth and development of a given species happened by chance and enabled it to survive in hard con- ditions and further develop. Elasticity and redundancy are very typical for the world of chance, but because of these properties, this world has a large number of possibilities and abilities to develop and regenerate after various natural catastrophes (Łukasiewicz 2006).
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Dental Press J. Orthod.  vol.17 número5

Dental Press J. Orthod. vol.17 número5

Our results showed differences between the groups of evaluators in the preference after treat- ment, statistically significant difference in the pro- file evaluation performed by orthodontists (61.95%), compared with the group of dentists (57.76%) and laymen (56.85%), but no statistically significant dif- ference between dentists and lay people. The analy- sis of variance (ANOVA) denoted agreement between the choices of dentists and lay people (p = 0.85), but a disagreement with orthodontists (p = 0.03 and p = 0.00, respectively). Thus it is clear that the higher the degree of information of the evaluator in the spe- cific area, the greater the degree of criterion.
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Dental Press J. Orthod.  vol.21 número3

Dental Press J. Orthod. vol.21 número3

Objetivo: avaliar as alterações em variáveis cefalométricas esqueléticas, dentoalveolares e do perfil tegumentar, induzidas pelo aparelho Twin Block de Clark (TBC), em pacientes com má oclusão de Classe II, divisão 1, e comparar as alterações nos diferentes estágios de maturação das vértebras cervicais. Métodos: telerradio- grafias laterais pré- e pós-tratamento de 53 pacientes com má oclusão de Classe II, divisão 1, foram comparadas às telerradiografias de 60 pacientes controle, para avaliar as alterações esqueléticas, dentoalveolares e no perfil tegumentar. A maturação esquelética foi avaliada de acordo com os estágios de maturação das vértebras cervicais. As alterações médias e as diferenças entre o pré- e o pós-tratamento (T 2 – T 1 ) foram comparadas por meio do teste de postos sinalizados de Wilcoxon e do teste U de Mann-Whitney, respectivamente. Foram realizadas comparações intergrupos para os diferentes estágios de maturação das vértebras cervicais, por meio do teste de Kruskal-Wallis e teste U de Mann-Whitney (p ≤ 0,05). Resultados: em comparação aos pacientes do grupo controle, constatou-se que houve uma redução significativa do ângulo ANB (p < 0,001), em virtude de alterações no ângulo SNB nos estágios CS2 e CS3 (p < 0,001), e nos ângulos SNA (p < 0,001) e SNB (p = 0,016) no estágio CS4. Houve um aumento significativo do ângulo GoGn-SN nos estágios CS2 (p = 0,007) e CS4 (p = 0,024), e um aumento em Co-Gn e Go-Gn em todos os estágios de maturação das vértebras cervicais (p < 0,05). Houve redução significativa em U1-SN e um aumento do IMPA em todos os estágios de maturação das vértebras cervicais (p < 0,05). Houve retração significativa do lábio superior em CS3 (p = 0,001), protrusão do lábio inferior em CS2 (p = 0,005), aumento do ângulo nasolabial em CS4 (p = 0,006) e do ângulo Z em CS3 (p = 0,016), além de redução do ângulo H em CS2 (p = 0,013) e CS3 (p = 0,002). Quando as diferenças médias entre pré- e pós-tratamento foram comparadas entre os diferentes estágios de maturação das vértebras cervicais, foram identificadas diferenças significativas para os ângulos SNA, SNB e UI-SN, assim como para o overjet. Conclusões: o uso do aparelho Twin-Block, associado ao crescimento craniofacial normal, melhora a estética facial em pacientes com má oclusão de Classe II, divisão 1, por meio de alterações nas estruturas esqueléticas e dentoalveolares subjacentes. Esse crescimento mandibular mais favorável pode ocorrer durante qualquer um dos estágios de maturação das vértebras cervicais, com um efeito mais acentuado durante o estágio CS3.
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Rev. odontol. UNESP  vol.44 número5

Rev. odontol. UNESP vol.44 número5

Table  3 presents the results of the correlation and multiple regression analyses of the orthodontists’ characteristics and the indications for Class II treatment according to the stages of occlusal development and malocclusion severity. Multiple regression analysis including the variables (predictors) with the higher correlations revealed that the percentage of daily patients requiring interceptive orthodontics in the orthodontists’ practices and academic involvement were positively correlated with all of the dependent variables. he coeicients of multiple determination for the multiple regression ranged from 27% to 46%. he clinicians with higher demands of patients seeking “early” orthodontic treatment indicated earlier Class II therapies than the orthodontists with small percentages of young patients (P <0.01). Academic involvement was inversely correlated with Class II treatment (P <0.01), i.e., a greater the academic involvement was associated with fewer Class II treatment indications. he other predictors did not correlate signiicantly with the Class II therapy indications.
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CBCT evaluation of the upper airway morphological changes in growing patients of class II division 1 malocclusion with mandibular retrusion using twin block appliance: a comparative research.

CBCT evaluation of the upper airway morphological changes in growing patients of class II division 1 malocclusion with mandibular retrusion using twin block appliance: a comparative research.

The measurement variables were listed in Table 3. In the TB group, the mandible advanced by 3.5262.14 mm (mean6SD) in the horizontal direction and 3.7762.10 mm in the vertical direction, respectively. With the mandibular advancement, the hyoid bone showed a more forward and downward displacement, and the upper airway expanded after treatment. The greatest changes of volume and mean cross-sectional area occurred in the oropharynx. In addition, the post-oropharynx turned more elliptic in the transverse shape compared with the pre-treatment while the post-nasopharynx became more circular. The hypopharyngeal shape, however, showed no significantly change during treatment. By comparing the T2 data of TB group and the control data, we discovered that the hyoid bone in the post-TB group was more anterior but its vertical position did not show a significant difference. A significant enlargement in the oropharynx and hypopharynx after TB treatment was observed. In addition, the oropharynx showed more oval-shaped after TB treatment.
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Investigating The Use Of Mobile Computing In Zimbabwe Polytechnics Case Of A Polytechnic In Zimbabwe

Investigating The Use Of Mobile Computing In Zimbabwe Polytechnics Case Of A Polytechnic In Zimbabwe

1. INTRODUCTION In the period prior to 2003 Polytechnics in Zimbabwe had a mix of Information Communication Technologies (ICTs), varying from one institution to the other. There was no uniformity as to what ICTs individual institutions invested in, so while some institutions had several computer laboratories of clone desktops, some did not have even a single lab. While some had connected to the internet through the dialup system which came through telephone lines, some had no idea what internet was.A breakthrough came in 2003 when a non- governmental organization called VVOB, a Belgian abbreviation which translates in English to Flemish for Technical Assistance, came in with a project called the College Information Technology Enhancement Programme (CITEP), which helped to finance, train personnel and equip polytechnics with standard computer and network infrastructure (VVOB project document, 2003). They conducted training workshops for personnel, procured standard desktops, and installed fibre internet connectivity and setup Ethernet networks in these institutions. This project became the basis for mobile computing in Polytechnics. When the project ended in 2008, the institutions were now coordinated and some managed to go a step further by installing wireless access points within institutions using the fibre backbone. This allowed staff and students who had WIFI enabled devices to be able to access internet and research
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Rev. odontol. UNESP  vol.46 número3

Rev. odontol. UNESP vol.46 número3

Introduction: Several factors can interfere with orthodontic treatment, and it is important to verify which ones may hinder its success. Objective: To compare the duration of orthodontic treatment between nasal and mouth breathers with Angle Class II, Division 1 malocclusion. Material and method: This is an analytical observational study which used the records of orthodontic patients cared at a higher education institution in Sao Paulo state, Brazil, between 1999 and 2009. Data from the following variables were analyzed: age, gender, breathing mode (nasal or oral breathing), and treatment duration (beginning and end). Patients were matched for age and treatment used. The ANOVA test was applied to analyze the study data at 5% significance level (p<0.05). Result: The study sample consisted of 36 individuals, 16 female (10 nasal breathers and six mouth breathers) and 20 males (eight nasal breathers and 12 mouth breathers), aged nine to 15 years (mean age=13.021). As for orthodontic treatment duration, individuals in the nasal breathing group remained between 27 and 74 months (mean duration=39.61) under treatment, whereas treatment of individuals in the mouth breathing group lasted between 29 and 50 months (mean duration=36.66). No statistically significant differences were observed between the study groups. Conclusions: We conclude that the variable altered breathing mode does not interfere with treatment duration.
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