Changes in masticatory performance during the retention period following 4-premolar extraction and non-extraction orthodontic treatment

Lee, Song-Hyun; Fang, Mei Ling; Choi, Yoon Jeong; Yu, Hyung Seog; Kim, Jeehwan; Hu, Kyung-Seok; Lee, Kee‐Joon

doi:10.1007/s00784-022-04817-y

Cited by 3 publications

(2 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This study has the following shortcomings. Research on the remodeling of the entire alveolar process at different retention stages after completing orthodontic treatment was not included The stability of the zygomatic pillar during the retention period is vital for the long-term effectiveness of the orthodontic treatment because occlusal force may recover during the retention period [ 22 ]. Therefore, further expanding the sample size and extending the follow-up observation time are warranted.…”

Section: Resultsmentioning

confidence: 99%

Orthodontic maxillary molar movement-induced zygomatic pillar remodeling and its consequences on occlusal characteristics and stress distribution

Li,

Bao,

et al. 2024

Clin Oral Invest

View full text Add to dashboard Cite

Objective We aimed to evaluate changes in the zygomatic pillar during orthodontic treatment involving premolar extraction, analyze the effects of maxillary first molar movement on zygomatic pillar remodeling, and examine occlusal characteristics and stress distribution after remodeling. Methods Twenty-five patients who underwent premolar extraction were included in the study. The zygomatic pillar measurement range was defined, and cross-sectional areas, surface landmark coordinates, alveolar and cortical bone thicknesses, and density changes were assessed using Mimics software based on the cone-beam computed tomography scans taken before (T0) and after the treatment (T1). Multiple linear regression analysis was performed to determine the correlation between changes in the zygomatic pillar and maxillary first molar three-dimensional (3D) movement and rotation. Additionally, the correlation between pillar remodeling and occlusal characteristics was analyzed by Teetester. Pre- and post-reconstruction 3D finite element models were constructed and loaded with an average occlusal force of two periods. Results The morphological and structural remodeling of the zygomatic pillar after orthodontic treatment involving premolar extraction showed a decreased cross-sectional area of the lower segment of the zygomatic pillar. The zygomatic process point moved inward and backward, whereas the zygomatico-maxillary suture point moved backward. The thicknesses of the zygomatic pillar alveolar and cortical bones were thinner, and reduced alveolar bone density was observed. Simultaneously, the movement and angle change of the maxillary first molar could predict zygomatic pillar reconstruction to a certain extent. With decreasing the total occlusal force and the occlusal force of the first molar, occlusal force distribution was more uniform. With zygomatic pillar remodeling, occlusal stress distribution in the zygomatic alveolar ridge decreased, and occlusal stress was concentrated at the junction of the vertical and horizontal parts of the zygomatic bone and the posterior part of the zygomatic arch. Conclusions Orthodontic treatment involving premolar extraction led to zygomatic pillar remodeling, making it more fragile than before and reducing the occlusal force of the maxillary first molar and the entire dentition with stress concentrated in weak areas. Clinical relevance No other study has focused on the effects of orthodontics on pillar structures. The present study indicates that the mesial movement of the maxillary first molar weakened the zygomatic pillar and reduced occlusal function, thereby providing insights for inserting anchorage screws and facial esthetics.

show abstract

Section: Resultsmentioning

confidence: 99%

Orthodontic maxillary molar movement-induced zygomatic pillar remodeling and its consequences on occlusal characteristics and stress distribution

Li,

Bao,

et al. 2024

Clin Oral Invest

View full text Add to dashboard Cite

show abstract

“…In this study, tooth extraction did not affect the improvement of masticatory performance after orthodontic treatment. 15 Another study observed that in all malocclusion groups, bite force improved after orthodontic treatment. 16 By examining the quality of life in a study, research has reported that before orthodontics, there quality of life in patients with class III malocclusion was low, but improved significantly after the orthodontic treatment stage.…”

Section: Discussionmentioning

confidence: 97%

Masticatory performance and oral health related to quality of life before and after orthodontic treatment: a systematic review and meta-analysis

Sabzevari,

Fatemi,

Soleimani

et al. 2024

Eur J Transl Myol

View full text Add to dashboard Cite

Masticatory performance is considered an important step in the beginning of the digestive process and considering the patient’s aesthetic and functional factors, it is necessary to choose appropriate treatments. Based on the evidence during orthodontic treatment, the restoration of the physiological function of masticatory performance should not be neglected. The present study aimed to evaluate the association between orthodontic treatment and improved masticatory performance and oral health related to quality of life. In the present study, all articles published till the end of August 2023 were extracted by two trained researchers independently through a search in databases like PubMed, Scopus, Science Direct, ISI, Web of Knowledge, Elsevier, Wiley, and Embase, and Google Scholar search engine using keywords and their combinations. Data analysis was done using the fixed effects model in a meta-analysis, by STATA (version 17); a P-value of less than 0.05 was considered significant. Based on the results, the mean difference in masticatory performance between pre-treatment and post-treatment was 2.23 (MD: 2.23; 95CI, 2.17, 2.29. p<0.01; I2= 99.98%; p<0.01). The mean difference in oral health related to quality of life between pre-treatment and post-treatment was -32.23 (MD: -32.23; 95CI, -33.35, -31.11. p<0.01; I2= 97%; p<0.01). Orthodontic treatment had a positive effect on masticatory performance and improved the quality of life of patients after treatment.

show abstract

Orthodontic Maxillary Molar Movement-Induced Zygomatic Pillar Remodeling and its Consequences on Occlusal Characteristics and Stress Distribution

Li,

Bao,

et al. 2024

Preprint

View full text Add to dashboard Cite

Objective: To evaluate zygomatic pillar changes during orthodontic treatment with premolar extraction, then analyze the effects of maxillary first molar movement on zygomatic pillar remodeling, and examine occlusal characteristics and stress distribution after reconstruction. Methods: 25 premolar extraction patients were included. Zygomatic pillar measurement range was defined, and cross-sectional areas, surface landmark coordinates, and alveolar and cortical bone thickness and density changes were assessed using Mimics based on the CBCT taken before(T0)and after treatment(T1). Multiple linear regression was employed to explain correlations between zygomatic pillar changes and maxillary first molar 3D movement and rotation. Correlations between pillar remodeling and occlusal characteristics, as analyzed by Tteester, were calculated. Pre- and post-reconstruction 3D finite element models (FEA) were constructed and loaded with average occlusal force of two period , respectively. Results: Zygomatic pillar cross-sectional area, landmark coordinates, bone thickness and alveolar bone density decreased. The mesial and lingual movement of the maxillary molars was strongly correlated with these changes, accounting for >40% variations. Occusal stress concentrated on weak areas after remodeling. Conclusions: Orthodontic treatment with premolar extraction led to zygomatic pillar remodeling, making it more fragile and reducing the occusal force of the maxillary first molar and the entire dentition with stress concentrating on weak areas. Clinical Relevance: No other study has focused on the effects of orthodontics on pillar structures.This research indicates that mesial movement of the maxillary first molar weakened zygomatic pillar, reduced occlusal function, and providing insights for insrting anchorage screws and facial aesthetics.

show abstract

Changes in masticatory performance during the retention period following 4-premolar extraction and non-extraction orthodontic treatment

Cited by 3 publications

References 40 publications

Orthodontic maxillary molar movement-induced zygomatic pillar remodeling and its consequences on occlusal characteristics and stress distribution

Orthodontic maxillary molar movement-induced zygomatic pillar remodeling and its consequences on occlusal characteristics and stress distribution

Masticatory performance and oral health related to quality of life before and after orthodontic treatment: a systematic review and meta-analysis

Orthodontic Maxillary Molar Movement-Induced Zygomatic Pillar Remodeling and its Consequences on Occlusal Characteristics and Stress Distribution

Contact Info

Product

Resources

About