Treatment stability in patients with Class II malocclusion treated with 2 maxillary premolar extractions or without extractions

Janson, Guilherme; Camardella, Leonardo Tavares; Araki, Janine Della Valle; Freitas, Marcos Roberto de; Pinzan, Arnaldo

doi:10.1016/j.ajodo.2008.08.033

Cited by 30 publications

(37 citation statements)

References 40 publications

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“…These observations should be related to the higher number of posterior contacts, which give stable intercuspal contacts to allow elevator muscles to achieve higher activity during clenching . The term ‘stable occlusion’ is defined in prosthodontics as ‘the equalization of tooth contacts that prevents tooth movement after closure’ , although in orthodontics, it includes the relapse status of a finished orthodontic occlusion, which is stable to prevent relapse and unstable in relapse cases . Baba, et al .…”

Section: Introductionmentioning

confidence: 99%

Stable tooth contacts in intercuspal occlusion makes for utilities of the jaw elevators during maximal voluntary clenching

Wang

Zhang

Xing

et al. 2013

J of Oral Rehabilitation

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Data are inconsistent concerning whether the level of the surface electromyographic (SEMG) activity of jaw-closing muscles increases when biting forces elevated during maximal voluntary clenching (MVC). In this study, T-Scan III system and BioEMG III system were used to record bite force, occlusal contacts and SEMG activity of the anterior temporalis (TA) and of the masseter muscles (MM) simultaneously. Recordings were obtained from 16 healthy young adult males during different conditions: (i) a fast MVC from resting position to intercuspal position (ICP); (ii) mandibular movements from ICP to protrusive or lateral edge-to-edge positions with teeth in contact with biting; (iii) a fast MVC in protrusive and lateral edge-to-edge positions. A higher level of SEMG activity was associated with a higher bite force during occluding movements (P < 0.05). However, during fast MVC from rest to ICP, the largest number of occlusal contacts was achieved and distributed more symmetrically, the highest level of biting force was obtained, but the SEMG activity of the jaw elevator muscles was reduced compared with its maximum level (P < 0.05). This phenomenon was not observed during the fast MVC in protrusive or lateral edge-to-edge positions. The present results that a lower SEMG activity was associated with the largest number of occlusal contacts and the highest level of bite force during centric MVC demonstrated a complex integration of jaw-closing muscles when a stable occlusion is present.

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Section: Introductionmentioning

confidence: 99%

Stable tooth contacts in intercuspal occlusion makes for utilities of the jaw elevators during maximal voluntary clenching

Wang

Zhang

Xing

et al. 2013

J of Oral Rehabilitation

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“…12 Some authors speculate that dental extractions may cause some problems to the patient such as: Temporomandibular disorder, 2,6 lack of treatment stability, 10,17 and unwanted profile flattening, which would compromise the patient's esthetics by the end of the treatment. 22,23 However, other authors point the numerous favorable results obtained on treatment with extraction of two upper premolars with good occlusal stability in the long term 13,14 and without direct influence on the flattening of the patient's profile. 11,12,15 The cephalometric alterations promoted by this treatment protocol and often mentioned in literature are: Increase of nasolabial angle, retraction of upper lip, reduction of profile convexity and retraction with verticalization of upper incisors, [24][25][26][27] i.e., the orthodontic treatment with extractions of maxillary premolars has little influence in relation to skeletal changes and provides greater dental and profile alterations.…”

mentioning

confidence: 98%

Cephalometric changes in Class II division 1 patients treated with two maxillary premolars extraction

Seben

Valarelli

Freitas

et al. 2013

Dental Press J. Orthod.

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Objective: The purpose of this study was to evaluate the cephalometric alterations in patients with Angle Class II division 1 malocclusion, orthodontically treated with extraction of two maxillary premolars. Methods: The sample comprised 68 initial and final lateral cephalograms of 34 patients of both gender (mean initial age of 14.03 years and mean final age of 17.25 years), treated with full fixed appliances and extraction of the first maxillary premolars. In order to evaluate the alterations due the treatment between initial and final phases, the dependent t test was applied to the studied cephalometric variables. Results: The dentoskeletal alterations due to extraction of two maxillary premolars in the Class II division 1 malocclusion were: maxillary retrusion, improvement of the maxillomandibular relation, increase of lower anterior face height, retrusion of the maxillary incisors, buccal inclination, protrusion and extrusion of the mandibular incisors, besides the reduction of overjet and overbite. The tissue alterations showed decrease of the facial convexity and retrusion of the upper lip. Conclusions: The extraction of two maxillary premolars in Class II division 1 malocclusion promotes dentoskeletal and tissue alterations that contribute to an improvement of the relation between the bone bases and the soft tissue profile. Objetivo: avaliar as alterações cefalométricas em pacientes com má oclusão Classe II, divisão 1, de Angle, tratados ortodonticamente com extrações de dois pré-molares superiores. Métodos: a amostra consistiu de 68 telerradiografias iniciais e finais de 34 pacientes de ambos os sexos (idade inicial média de 14,03 anos e idade final média de 17,25 anos), tratados com aparelho fixo completo e extrações de primeiros pré-molares superiores. Para avaliar as alterações decorrentes do tratamento entre as fases inicial e final, foi realizado o teste t dependente aplicado às variáveis cefalométricas estudadas. Resultados: as alterações dentoesqueléticas decorrentes da extração de dois pré-molares superiores na má oclusão de Classe II, divisão 1, foram retrusão da maxila, melhora da relação maxilomandibular, aumento da altura facial anteroinferior, retrusão dos incisivos superiores, vestibularização, protrusão e extrusão dos incisivos inferiores, além da diminuição dos trespasses horizontal e vertical. As alterações tegumentares mostraram diminuição da convexidade facial e retrusão do lábio superior. Conclusões: a extração de dois pré-molares superiores na má oclusão de Classe II, divisão 1, propicia alterações dentoesqueléticas e tegumentares que contribuem para uma melhora da relação entre as bases ósseas e do perfil mole.Palavras-chave: Ortodontia corretiva. Circunferência craniana. Estudos retrospectivos. Extração dentária.

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“…[2][3][4][5] The treatment of Class II Division 1 malocclusion can be accomplished by several methods. [6][7][8][9][10] Treatment considerations include the patient's facial profile, skeletal pattern, growth potential, and severity of the malocclusion. 6 A deep overbite can be corrected by intrusion of anterior teeth or extrusion of posterior teeth, or a combination of both.…”

Section: Introductionmentioning

confidence: 99%

Correlations between dentoskeletal variables and deep bite in Class II Division 1 individuals

et al. 2011

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This study aimed to evaluate the cephalometric pattern of Class II Division 1 individuals with deep bite, and to determine possible correlations between dentoskeletal variables and deep bite. Comparisons were also made between genders and cases that were to be treated both with and without premolar extraction. A total of 70 lateral cephalograms were used, from both male (n = 35) and female (n = 35) individuals with an average age of 11.6 years, who simultaneously presented with ANB ≥ 5º and overbite ≥ 4 mm. Statistical analysis involved parametric (t-test) and non-parametric (Mann-Whitney) tests for independent samples, as well as the Spearman correlation test (p ≤ 0.05). The values of Go-Me, Ar-Pog, PM-1 and PM-CMI were higher in males (p < 0.05). However, no significant differences were found among the averages of the cephalometric measurements when the sample was divided by treatment with and without extraction. Deep bite was positively correlated to the PM-1 and SNA measurements, and negatively correlated to the Go-Me, ArPog, SNB and SNGoMe measurements. The main factors associated with the determination of deep bite in Angle's Class II Division 1 cases were: greater lower anterior dentoalveolar growth and/or lower incisor extrusion, horizontal growth pattern, maxillary protrusion and mandibular retrusion.

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Treatment stability in patients with Class II malocclusion treated with 2 maxillary premolar extractions or without extractions

Cited by 30 publications

References 40 publications

Stable tooth contacts in intercuspal occlusion makes for utilities of the jaw elevators during maximal voluntary clenching

Stable tooth contacts in intercuspal occlusion makes for utilities of the jaw elevators during maximal voluntary clenching

Cephalometric changes in Class II division 1 patients treated with two maxillary premolars extraction

Correlations between dentoskeletal variables and deep bite in Class II Division 1 individuals

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