Axiographic findings in patients undergoing orthodontic treatment with and without premolar extractions

Heiser, W; Stainer, Martin; Reichegger, Hans; Niederwanger, Andreas; Kulmer, S

doi:10.1093/ejo/26.4.427

Cited by 5 publications

(4 citation statements)

References 5 publications

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“…They recorded the tracings before and soon after active orthodontic treatment and then again after the retention period and did not find significant differences between groups. The variables gathered by Heiser et al 6 are not directly comparable to those used in this study, because, contrary to us, they did not document the movements based on the hinge axis owing to technical limitations of the axiography device they used. However, they observed a significantly increased horizontal condylar inclination on the sagittal plane during protrusive movements after the retention period, in both groups.…”

Section: Discussioncontrasting

confidence: 83%

“…To the best of our knowledge, the research by Heiser et al 6 is the only work previously published on the same topic treated here. These authors compared mechanic axiographic tracings for protrusion/retrusion movements in patients treated with dental extractions to a control group without extractions.…”

Section: Discussionmentioning

confidence: 86%

“… 3 Others showed that the same rate of relapses and crowding after orthodontic treatment with or without premolar extraction treatment is to be expected. 4 5 6 In the beginning of the 20th century, Angle 7 and his followers maintained that treatment without extractions was preferable. Very soon, Case 8 counter-argued Angle's teaching recommending extraction in less than 10% of the cases.…”

Section: Introductionmentioning

confidence: 99%

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Premolar Extraction Affects Mandibular Kinematics

et al. 2022

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Objectives The practice of premolar extraction in orthodontics is controversial for its potential detrimental effects on the stomatognathic system. However, the ways in which premolar extraction affects mandibular function are still poorly understood. The purpose of this study was to assess the influence of premolar extraction on mandibular kinematics by evaluating axiographic tracings. Materials and Methods Forty-five orthodontically treated patients with premolar teeth extraction were compared with 45 paired untreated controls, selected for the absence of malocclusions. Systematic three-dimensional axiographic recordings of the mandibular movements were performed for protrusive–retrusive movements and speech. The transversal deviations and length of the movements were recorded for both sides along with the rotation angle during speech. Statistical Analysis Differences between the axiographic variables were analyzed via the permutation test and Wilcoxon rank-sum test. Linear regression was performed to test whether axiographic parameters were predictive of group affiliation. Dot plots were used to explore the distribution of each of the axiographic outcomes, and isometric principal component analysis to assess the differences between the cumulative effects of premolar extraction on jaw motion. Results The mandibular lateral translation in protrusion–retrusion and speech, the amount of rotation as well as the length of mandibular movements during speech were significantly higher in the treated subjects than in the controls, while retral stability did not differ. The linear regression yielded significant results for the mandibular lateral translation in protrusion–retrusion. The isometric principal component analysis showed higher values of the axiographic variables for 11 out of 45 individuals in the study sample compared with the control group. Conclusions Premolar extraction altered mandibular kinematics in at least 25% of the cases within our sample, and the transversal discrepancy between protrusive and retrusive tracings was even predictive of group affiliation. These results support the notion that the routine practice of premolar extraction as part of the orthodontic treatment should be discouraged. It is compelling to perform further studies to assess whether a disrupted kinematics of the mandible is associated to temporomandibular disorders.

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Section: Discussioncontrasting

confidence: 83%

Section: Discussionmentioning

confidence: 86%

Section: Introductionmentioning

confidence: 99%

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Premolar Extraction Affects Mandibular Kinematics

et al. 2022

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“…Many studies have investigated changes in the skeletal and soft tissue parameters in orthodontic patients treated with premolar extractions [13,14]. However, there were only a few reports that evaluated changes in masticatory function in orthodontic patients treated with premolar extraction [14][15][16][17]. Tome et al [16] concluded in their kinesiology study that skillfulness in mandibular movement did not differ between extraction and non-extraction groups.…”

Section: Introductionmentioning

confidence: 99%

Chewing performance in orthodontic patients treated with extraction of premolars

Jang

Choi

et al. 2019

Oral Biol Res

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The purpose of the present study was to evaluate the kinematic parameters of the chewing cycles in patients who had undergone comprehensive orthodontic treatment with extraction of premolars and to compare these parameters with those of a non-extraction group. The samples for this retrospective study consisted of kinesiographic recordings obtained from patients who had undergone comprehensive orthodontic treatment without orthognathic surgery. They were divided into a non-extraction group (n=19) and an extraction group (n=40) depending on whether their premolars were extracted for orthodontic treatment. Mandibular kinesiography was recorded using Bio-EGN before (T1) and after (T2) the treatment, and chewing cycle time, velocity, the position of turning point, and the lateral width of the cycle were measured. No significant difference was found in most of the kinematic parameters between the extraction and non-extraction groups at T1 and in those between T1 and T2 in the non-extraction group. In the extraction group, on the other hand, opening and closing velocities significantly decreased and the turning point of the chewing cycle was significantly more superior at T2 than at T1. The chewing cycle time did not significantly differ between T1 and T2 in the extraction group. Patients who have undergone orthodontic treatment with premolar extraction have chewing cycles that are shorter and slower than those before the treatment, and their chewing movement may differ from that of those who have not undergone extraction.

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