Changes in occlusal function after extraction of premolars: 2-year follow-up

Yoon, Wookang; Hwang, Soonshin; Chung, Chooryung J.; Kim, Kyung Ho

doi:10.2319/112116-836.1

Cited by 24 publications

(21 citation statements)

References 23 publications

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“…There are studies showing that occlusal force may change during orthodontic treatment [19,20]. From this, we can infer that the morphology of the masseter muscles, which is one of the most superficial and massive muscles on the face, may influence the morphology of the face.…”

Section: Discussionmentioning

confidence: 81%

Thickness change of masseter muscles and the surrounding soft tissues in female patients during orthodontic treatment: a retrospective study

et al. 2020

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Background: Facial esthetics is a major concern of orthodontic patients. This study aims to evaluate orthodontic treatment-related thickness changes of the masseter muscles and surrounding soft tissues and the potential factors that would influence these changes during orthodontic treatment in female adults. Methods: Forty-two female adult patients were included in this retrospective study and were divided into extraction (n = 22) and nonextraction (n = 20) groups. Pretreatment and posttreatment cone-beam computed tomography (CBCT) images were superimposed and reconstructed. The thickness changes of the masseter area of facial soft tissue (MAS), masseter muscles (MM) and surrounding fat tissue (FT) were measured. Pretreatment age, treatment duration, sagittal relationship (ANB), and vertical relationship (Frankfort-mandibular plane angle, FMA)related MAS, MM and FT changes were compared between extraction and nonextraction groups. Spearman's correlation coefficient was calculated between the above variables. Regression analysis was conducted to confirm the causal relations of the variables. Results: The thickness of MAS and MM significantly decreased in both groups, with larger decreases (> 1 mm) in the extraction group. There were strong correlations (r > 0.7) between the thickness decrease in MAS and MM in both groups and moderate correlations (r > 0.4) between MAS and FT in the nonextraction group. A significantly greater decrease of MAS and MM were found to be moderately correlated with a smaller FMA (r > 0.4) in the extraction group. Scatter plots and regression analysis confirmed these correlations. Conclusions: Masseter muscles and the surrounding soft tissue exhibited a significant decrease in thickness during orthodontic treatment in female adults. Low-angle patients experienced a greater decrease in soft tissue thickness in the masseter area in the extraction case. But the thickness changes were clinically very small in most patients.

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Section: Discussionmentioning

confidence: 81%

Thickness change of masseter muscles and the surrounding soft tissues in female patients during orthodontic treatment: a retrospective study

et al. 2020

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“…As for the duration of retention investigated, the distalization group had an average of over 3 years of retention, which was similar to findings of recently published studies on retention, some even in growing patients. [32][33][34] The control group with minor tooth movement had a slightly longer retention period of nearly 4 years.…”

Section: Discussionmentioning

confidence: 98%

Long-term stability of miniscrew anchored maxillary molar distalization in Class II treatment

Bechtold¹,

Park²,

Kim³

et al. 2020

The Angle Orthodontist

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Objective To investigate treatment stability of miniscrew-anchored maxillary distalization in Class II malocclusion. Materials and Methods This retrospective study included a distalization (n = 19) and a control (n = 19) group; a patient group with minor corrections served the control. Lateral cephalograms of 38 adult patients were taken before (T0), immediately after (T1), and 3–4 years after (T2) treatment. Horizontal and vertical movement and tipping of the maxillary first molars (U6) and central incisors (U1) were measured along with skeletal craniofacial parameters at three time points to compare the two groups regarding the achieved treatment effects and their stability. Results Total arch distalization therapy led to 4.2 mm of distal movement of U6 without distal crown tipping (0.6° of axis change) and 3.3° of occlusal plane steepening. Over an average retention period of 42 months, maxillary total arch distalization provided high stability of treatment results, showing the same amount of mesial movement (0.7 mm) as the control group. Conclusions In Class II treatment, miniscrew-anchored maxillary total arch distalization can provide stable distal movement of the maxillary first molars and central incisors.

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“…19,20 In this study, the Dental Prescale System was used because it was relatively simple to use in practice and did not require any specific measuring device other than a thin pressure-sensitive film to cover the occlusal surface. 6,21,22 Although a possibility of overestimation of bite force exists because of technical limitations of the color scanning system, bite force and occlusal contact area are comfortably measured close to the maximal intercuspal position with good reproducibility. 23 This is an advantage over the rigid material used in the T-scan system, 24 which may include unnecessary shift or displace-ment of the mandible due to the inadequate flexibility of the device.…”

Section: Discussionmentioning

confidence: 99%

Posterior dental compensation and occlusal function in adults with different sagittal skeletal malocclusions

et al. 2020

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The aim of this study was to compare posterior tooth inclinations, occlusal force, and contact area of adults with different sagittal malocclusions. Methods: Transverse skeletal parameters and posterior tooth inclinations were evaluated using cone beam computed tomography images, and occlusal force as well as contact area were assessed using pressure-sensitive films in 124 normodivergent adults. A linear mixed model was used to cluster posterior teeth into maxillary premolar, maxillary molar, mandibular premolar, and mandibular molar groups. Differences among Class I, II, and III groups were compared using an analysis of variance test and least significant difference post-hoc test. Correlations of posterior dental inclinations to occlusal function were analyzed using Pearson's correlation analysis. Results: In male subjects, maxillary premolars and molars had the smallest inclinations in the Class II group while maxillary molars had the greatest inclinations in the Class III group. In female subjects, maxillary molars had the smallest inclinations in the Class II group, while maxillary premolars and molars had the greatest inclinations in the Class III group. Occlusal force and contact area were not significantly different among Class I, II, and III groups. Conclusions: Premolar and molar inclinations showed compensatory inclinations to overcome anteroposterior skeletal discrepancy in the Class II and III groups; however, their occlusal force and contact area were similar to those of Class I group. In subjects with normodivergent facial patterns, although posterior tooth inclinations may vary, difference in occlusal function may be clinically insignificant in adults with Class I, II, and III malocclusions.

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Changes in occlusal function after extraction of premolars: 2-year follow-up

Cited by 24 publications

References 23 publications

Thickness change of masseter muscles and the surrounding soft tissues in female patients during orthodontic treatment: a retrospective study

Thickness change of masseter muscles and the surrounding soft tissues in female patients during orthodontic treatment: a retrospective study

Long-term stability of miniscrew anchored maxillary molar distalization in Class II treatment

Posterior dental compensation and occlusal function in adults with different sagittal skeletal malocclusions

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