Objective: To compare the effect of three kinds of extraction model on high angle bimaxillary protrusion patients.
Methods: A total of 30 patients with Class I malocclusion and bimaxillary protrusion, aged 14-25 years old, were selected and divided into three groups. Four first premolars were extracted in the first group. The two maxillary first premolars and two mandibular first molars were extracted in the second group. The two maxillary first premolars and two mandibular first molars were extracted in the third group, and two additional micro-implants used as orthodontic anchorage in maxilla. Three groups were all treated with MBT appliance. Cephalometric analysis were carried out before and after treatment, and the results were analyzed with statistics.
Results: 1) About the hard tissues, compared with the first group, there were statistically significant differences of N-Me, SGo/NMe, ANS-Me, FH/MP, SN/MP, and ODI in the second and the third group after treatment (P<0.01). 2) About the soft tissues, the teeth and the alveolar bone, compared with the first group, there were statistically significant differences of Pg-Pos, Li-SnPos, Si-LiPos, LL-E, L1-NB, L1/NB, U1/L1, L7-MP in the second and the third group after treatment (P<0.01). 3) All patients received consummate orthodontic treatment and obtained fine occlusion. Facial profiles were improved significantly after orthodontic treatment.
Conclusion: 1) After orthodontic treatment with mandibular first molars extraction, FH/MP, SN/MP, N-Me, ANS-Me, L1-NB and L1/NB decreased respectively, and soft tissue profiles were improved significantly. 2) Additional micro-implant used as orthodontic anchorage in maxilla significantly contributed to the maxillary incisor retraction and subsequent soft tissue change. 3) The first molars extraction and additional micro-implant used as orthodontic anchorage are efficient in improving the facial profiles for high angle bimaxillary protrusion patients.
Download full-text PDF |
Source |
|---|
Publication Analysis
Top Keywords
Similar Publications
Objective: A 26-year-old woman came for orthodontic treatment to improve her profile with protrusive lips. Diagnosed as bimaxillary protrusion, extraction followed by anterior retraction was indispensable for the case. However, her left upper lateral incisor was absent, the left upper canine had moved mesially and replaced the adjacent incisor, and the original canine location was restored with a long implant, which was in good condition.
View Article and Find Full Text PDFTiming of Therapeutic Extractions Can Affect En Masse Anterior Retraction: A Split Mouth Randomized Clinical Trial.
Turk J Orthod
December 2024
Government Dental College, Kozhikode, Faculty of Orthodontics and Dentofacial Orthopaedics, Kerala, India.
Objective: To investigate the effect of deferred timing of therapeutic extraction on the rate of space closure during en masse anterior retraction.
Methods: Twenty-six patients (aged 16-24 years) with bimaxillary protrusion, crowding <3 mm, requiring bilateral extraction of four first premolars were recruited. Permuted block randomization was done.
Correction of Class I Bimaxillary Protrusion Using Sliding Mechanics With Mini-implant Anchorage: A Case Report.
Cureus
November 2024
Department of Orthodontics and Dentofacial Orthopaedics, Manav Rachna Dental College, Manav Rachna International Institute of Research and Studies, Faridabad, IND.
Class I bimaxillary protrusion is characterized by proclined incisors, a convex facial profile, procumbent lips, and increased lip strain. Treatment includes the extraction of premolars and the mesial movement of the proclined anterior teeth in the extraction spaces to correct the inclination. This case report describes the treatment of an 18-year-old male patient who presented with class I bimaxillary protrusion and procumbent lips.
View Article and Find Full Text PDFInterdisciplinary Management of a Class II Bimaxillary Protrusion Case With a Traumatized Maxillary Central Incisor: A Case Report.
Cureus
November 2024
Department of Orthodontics and Dentofacial Orthopedics, Manav Rachna Dental College, Faridabad, IND.
The class II bimaxillary protrusion malocclusion with class II or end on molar relation is generally associated with procumbency of lips. This case report presents a case of a 17-year-old nongrowing male patient with a traumatized left central incisor due to a fall with a chief complaint of forwardly placed and gap in upper front teeth. The traumatized left central incisor with Ellis class IV fracture was with a loss of crown structure and a poor prognosis of remaining tooth structure.
View Article and Find Full Text PDF3D analysis of long-term airway evolution following orthognathic approach of bimaxillary setback surgery without segmental osteotomy.
J Craniomaxillofac Surg
November 2024
Department of Oral and Maxillofacial Surgery, Capital Medical University School of Stomatology, 4 Tiantanxili St, Beijing, 100050, China. Electronic address:
Long-term evolution of airway space following bimaxillary setback surgery has been seldom reported. 31 patients with bimaxillary protrusion were included in this study. Bimaxillary setback surgery without segmental osteotomy were performed to alleviate their facial deformity.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!