Short-term effects of systematic premolar extraction on lip profile, vertical dimension and cephalometric parameters in borderline patients for extraction therapy—a retrospective cohort study

Kirschneck, Christian; Proff, Peter; Reicheneder, Claudia; Lippold, Carsten

doi:10.1007/s00784-015-1574-5

Cited by 40 publications

(42 citation statements)

References 56 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The orthodontic treatment of bimaxillary protrusive patients usually involves the extraction of premolars and retraction of anterior teeth, which results in increased chin prominence and improved facial profiles [4]. Several studies and clinical trials have shown that these changes of soft tissue chin were mainly due to the redistribution or reshaping of the soft tissues around the chin area following the retraction of incisors [5].…”

Section: Introductionmentioning

confidence: 99%

Orthodontic incisor retraction caused changes in the soft tissue chin area: a retrospective study

Zhang

et al. 2020

BMC Oral Health

View full text Add to dashboard Cite

Background: To investigate the area and morphological changes around the soft tissue chin after orthodontic incisor retraction. Methods: Fifty-nine female adults with bimaxillary protrusion requiring extraction of four premolars were included in the study. Cephalograms were taken before (T0) and after (T1) orthodontic treatment. The soft tissue changes, including the area, thickness and morphology were measured. Paired-t tests were performed for statistical comparisons. Pearson correlation analyses and backward multivariate regression analyses were used to identify the relationship between the soft tissue changes and incisor retraction. Results: Following the incisor retractions (5.35 ± 1.79 mm and 4.42 ± 1.62 mm for the upper and lower, respectively), there was a significant increase in the soft tissue thickness of L1c-LL (0.64 ± 1.67 mm, P = 0.025) and Pog-Pog' (0.44 ± 1.10 mm, P = 0.022), and a significant decrease in the soft tissue thickness of B-B′ (1.21 ± 1.34 mm, P < 0.01). Changes in the area of soft tissue chin and lower lip were not statistically significant (P > 0.05). Pearson coefficient between the thickness changes of B-B′ and the retraction of lower incisors was − 0.376. The multiple correlations between the soft tissue thickness changes and incisor retractions were Y = 1.02-0.42a + 0.42b for L1c-LL, and Y = 0.17-0.31b for B-B′. Conclusions:The orthodontic incisor retraction could cause soft tissue thickness changes (i.e. an increase in L1c-LL and Pog-Pog' and a decrease in B-B′) without area changes.

show abstract

Section: Introductionmentioning

confidence: 99%

Orthodontic incisor retraction caused changes in the soft tissue chin area: a retrospective study

Zhang

et al. 2020

BMC Oral Health

View full text Add to dashboard Cite

show abstract

“…The choice between extraction and nonextraction treatment is usually based on orthodontic training, treatment philosophy, or temporal trends . At the same time, the choice to extract teeth might have substantial impact on various parameters, such as vertical dimension, treatment stability, or arch widths, as well as on the perioral soft tissues and facial convexity .…”

mentioning

confidence: 99%

Soft tissue changes following extraction vs. nonextraction orthodontic fixed appliance treatment: a systematic review and meta‐analysis

Konstantonis

Vasileiou

Papageorgiou

et al. 2018

European J Oral Sciences

View full text Add to dashboard Cite

The aim of this systematic review was to assess the effect of systematic extraction protocols during orthodontic fixed appliance treatment on the soft tissue profile of human patients. Nine databases were searched until December 2016 for controlled clinical studies including premolar extraction or nonextraction treatment. After elimination of duplicate studies, data extraction, and risk-of-bias assessment according to the Cochrane guidelines, random-effects meta-analyses of mean differences (MD) or standardized mean differences (SMD) and their 95% CIs were performed, followed by subgroup, meta-regression, and sensitivity analyses. Extraction treatment was associated with increased lower lip retraction (24 studies; 1,456 patients; MD = 1.96 mm), upper lip retraction (21 studies; 1,149 patients; MD = 1.26 mm), nasolabial angle (21 studies; 1,089 patients; MD = 4.21°), soft-tissue profile convexity (six studies; 408 patients; MD = 1.24°), and profile pleasantness (three studies; 249 patients; SMD = 0.41). Patient age, extraction protocol, and amount of upper incisor retraction during treatment were significantly associated with the observed extraction effects, while the quality of evidence was very low in all cases due to risk of bias, baseline confounding, inconsistency, and imprecision. Although tooth extractions seem to affect patient profile, existing studies are heterogenous and no consistent predictions of profile response can be made.

show abstract

“…32 Katsaros and Katsaros et al also emphasized that the nasal and chin growth affect soft tissues, and those changes are more imperative than the effects of extraction patterns. 33,34 Kirschneck et al in their study of all first premolars extraction in borderline cases reported a significant decrease in SNA along with a reduction in incisor inclination, and no significant change in SNB 35 ; our study showed no significant change in either.…”

Section: Discussionmentioning

confidence: 43%

Comparison of soft and hard tissue changes between symmetric and asymmetric extraction patterns in patients undergoing orthodontic extractions

Irfan¹,

Fida²

2019

Dent. Med. Probl.

View full text Add to dashboard Cite

Background. Orthodontic treatment modalities and biomechanics are important factors influencing soft and hard tissues. Objectives. The aim of this study was to compare soft and hard tissue changes after implementing asymmetric and symmetric extraction patterns. Material and methods. A retrospective cross-sectional study was conducted using the orthodontic files of 62 patients from the dental clinics of a tertiary care hospital. Patients were divided into 2 groups, each of 31 patients. Group 1 referred to the symmetric extraction patterns (SEP), whereas group 2 regarded the asymmetric extraction patterns (AEP). The Wilcoxon signed-rank test was used to determine differences between the initial and final cephalometric parameters. The Mann-Whitney U-test was used to compare the treatment changes between SEP and AEP. The SEP and AEP groups were divided into subgroups for further analyses. The Kruskal-Wallis test was used to determine significant differences in the cephalometric changes among the different subgroups. In order to further establish inter-group differences, a pairwise comparison between the subgroups was made using the Mann-Whitney U-test. Results. In the symmetric group, the pre-and post-treatment values for all soft tissue variables, upper incisor-sella-nasion plane angle (UI-SN), lower incisor mandibular plane angle (L-IMPA), and Frankfurtmandibular plane angle (FMA) showed significant differences (p ≤ 0.05). In the asymmetric group, none of the soft tissue parameters showed any significant difference in the pre-and post-treatment values; however, FMA and L-IMPA differed significantly (p ≤ 0.05). The parameters UI-SN and FMA as well as all soft tissue variables except Z-angle (Z), were significantly different between the SEP and AEP groups. The medians and interquartile ranges (IQRs) of the cephalometric changes among the subgroups were compared using the Kruskal-Wallis test. All soft tissues parameters except Z showed significant differences. Conclusions. The symmetric extraction patterns leads to a greater change in the patient's profile, whereas asymmetric extractions can be carried out to remedy occlusal discrepancies without the risk of profile flattening. While employing premolar extractions aiming to reduce the facial height, due consideration with respect to biomechanics must be given.

show abstract

Short-term effects of systematic premolar extraction on lip profile, vertical dimension and cephalometric parameters in borderline patients for extraction therapy—a retrospective cohort study

Abstract: The decision, whether to extract healthy premolars in borderline patients for extraction therapy, is difficult to make. Our study clarifies the repercussions on cephalometric dentofacial parameters, facilitating future orthodontic extraction decisions.

Cited by 40 publications

References 56 publications

Orthodontic incisor retraction caused changes in the soft tissue chin area: a retrospective study

Orthodontic incisor retraction caused changes in the soft tissue chin area: a retrospective study

Soft tissue changes following extraction vs. nonextraction orthodontic fixed appliance treatment: a systematic review and meta‐analysis

Comparison of soft and hard tissue changes between symmetric and asymmetric extraction patterns in patients undergoing orthodontic extractions

Contact Info

Product

Resources

About