Soft Tissue Changes Following the Extraction of Premolars in Nongrowing Patients With Bimaxillary Protrusion

Abstract

Objective: To quantify the amount of perioral tissue changes following the extraction of four premolars in patients with bimaxillary protrusion who had nearly completed active growth. Materials and Methods: A literature search was conducted to identify clinical trials that assessed cephalometric perioral soft tissue changes in patients affected by biprotrusion and treated with extractions. Electronic databases (PubMed, ISI WoS Science Citation Index Expanded, and HubMed) were searched. Abstracts that appeared to fulfill the initial selection criteria were selected, and the full-text original articles were retrieved and analyzed. Only articles that fulfilled the final selection criteria were finally considered. Their references were also hand-searched for possible missing articles from the database searches. Results: Nine abstracts met the initial inclusion criteria and these articles were retrieved. From these, five were later rejected mostly because the sample dealt with growing subjects. Four articles remained and they showed that the upper and lower lips retracted and the nasolabial angle increased following premolar extraction. Upper lip retraction ranged from 2 mm to 3.2 mm, lower lip retraction ranged from 2 mm to 4.5 mm. Conclusions: The lip procumbency improves following the extraction of four premolars and this improvement is predictable. However, the changes are small and do not dramatically modify the profile. A ''dished in'' profile is not to be expected. Individual variation in response is large. (Angle Orthod 2010;80:211-216.)

Measurement of three-dimensional perioral soft tissue changes in dentoalveolar protrusion patients after orthodontic treatment using a structured light scanner

“…Therefore, improved soft tissue esthetics has become an important treatment objective. Dentoalveolar protrusion, characterized by protrusive and proclined upper and lower incisors and increased procumbency of the lips, 1 is a common chief complaint among Asian patients 2,3 seeking orthodontic care for esthetic reasons. Generally, extraction of first premolars is planned, along with retraction of the anterior teeth with maximum anchorage.…”

“…[2][3][4] In the past, soft tissue changes following the extraction of premolars in patients with dentoalveolar protrusion were evaluated primarily with lateral cephalometric radiographs. [5][6][7][8] Leonardi et al 1 reported in their systematic review that the upper and lower lips were retracted 2 to 3.2 mm and 2 to 4.5 mm, respectively, after treatment. However, conventional two-dimensional cephalometry presents several limitations, owing to its midsagittal projection, when investigating the changes of perioral soft tissue.…”

Effect of large incisor retraction on upper airway morphology in adult bimaxillary protrusion patients

“…Bimaxillary protrusion is a common disease in China and is commonly characterized by protrusive and prominent upper and lower incisors and an increased procumbency of the lips. [1][2][3][4] Typical orthodontic treatment includes extraction of the bimaxillary premolars and anterior tooth retraction, with maximum anchorage achieved through the placement of miniscrews, which enable the practitioners to achieve maximum anterior tooth retraction without undesirable movements of the posterior teeth. Despite the fact that the relationship between maximum anchorage and tooth displacement is well recognized, 5,6 retrospective upper airway analysis after retraction of the large incisors remains to be established.…”

Perawatan Maloklusi Kelas I Bimaksiler Protrusi disertai Gigi Berdesakan dan Pergeseran Midline menggunakan Teknik Begg

“…Pencabutan gigi premolar pertama digunakan untuk koreksi proklinasi gigi anterior seperti pada maloklusi kelas I dengan protrusi bidental. 4 Maloklusi Angle kelas I bimaksiler protrusi mempunyai hubungan molar normal namun rahang atas maupun bawah protrusi. 3 Kelainan yang paling banyak meyertai maloklusi kelas I adalah gigi berdesakan.…”