Biomaterial Database

[Non-extraction treatment in borderline class III malocclusion]. 2011

Lin-ling Chen, and Qing-ling You, and Yi-ming Yang

Department of Orthodontics, Ninth People's Hospital, College of Stomatology, Shanghai Jiao Tong University School of Medicine, Shanghai Key Laboratory of Stomatology, Shanghai 200011, China. chenlinling100@yahoo.com.cn

OBJECTIVE To evaluate the effect of non-extraction treatment protocol combined with rapid palatal expansion and lower molar distalization in borderline Class III malocclusion in adolescents. METHODS Nine borderline Class III patients (average age: 13.4 ± 0.7 years) with average (6.7 ± 2.8)mm crowding in maxilla and (2.6 ± 0.4) mm crowding in mandible received the treatment described above. The lateral cephalograms of these patients were analyzed. All patients had a pretreatment ANB angle greater than -3°. The difference before and after treatment was analyzed with paired t test using SPSS11.0 software package. RESULTS Evaluation of cephalometric measurements revealed forward movement of the maxilla, indicated by 1.69 mm forward positioning of A-point (P < 0.05), and an increase in SNA by 1° (P = 0.054). The mandible was inhibited from growing forward with slight retrusion evidenced by a decreased B-point (-1.88 mm, P < 0.05), and a decrease in SNB by 0.69° (P < 0.05). The combined maxillary and mandibular changes resulted in an increase in ANB angle (1.69°, P < 0.05). A clockwise rotation of the mandible was found, with an increase in Y-axis (0.88°,P < 0.05) and SN-MP (1.50°,P<0.05). Significant change was also found in the forward movement of maxillary incisors (+3.44 mm, P < 0.05), and the slight retrusive positioning of mandibular incisors (-0.5 mm, P > 0.05). An increase in U1-SnPg' (1 mm, P < 0.05) and a decrease in L1-SnPg' (0.63 mm, P > 0.05) resulted in the improvement of upper and lower lips relationship (1.88 mm, P < 0.05). CONCLUSIONS This treatment protocol can improve the sagittal jaws and upper-lower lip relationship.

UI	MeSH Term	Description	Entries
D007180	Incisor	Any of the eight frontal teeth (four maxillary and four mandibular) having a sharp incisal edge for cutting food and a single root, which occurs in man both as a deciduous and a permanent tooth. (Jablonski, Dictionary of Dentistry, 1992, p820)	Incisors
D008046	Lip	Either of the two fleshy, full-blooded margins of the mouth.	Philtrum,Lips,Philtrums
D008310	Malocclusion	Such malposition and contact of the maxillary and mandibular teeth as to interfere with the highest efficiency during the excursive movements of the jaw that are essential for mastication. (Jablonski, Illustrated Dictionary of Dentistry, 1982)	Angle's Classification,Crossbite,Tooth Crowding,Cross Bite,Angle Classification,Angles Classification,Bite, Cross,Bites, Cross,Classification, Angle's,Cross Bites,Crossbites,Crowding, Tooth,Crowdings, Tooth,Malocclusions
D008313	Malocclusion, Angle Class III	Malocclusion in which the mandible is anterior to the maxilla as reflected by the first relationship of the first permanent molar (mesioclusion).	Angle Class III,Habsburg Jaw,Hapsburg Jaw,Prognathism, Mandibular,Underbite
D008334	Mandible	The largest and strongest bone of the FACE constituting the lower jaw. It supports the lower teeth.	Mylohyoid Groove,Mylohyoid Ridge,Groove, Mylohyoid,Grooves, Mylohyoid,Mandibles,Mylohyoid Grooves,Mylohyoid Ridges,Ridge, Mylohyoid,Ridges, Mylohyoid
D008437	Maxilla	One of a pair of irregularly shaped bones that form the upper jaw. A maxillary bone provides tooth sockets for the superior teeth, forms part of the ORBIT, and contains the MAXILLARY SINUS.	Maxillae,Maxillary Bone,Bone, Maxillary,Bones, Maxillary,Maxillary Bones,Maxillas
D008963	Molar	The most posterior teeth on either side of the jaw, totaling eight in the deciduous dentition (2 on each side, upper and lower), and usually 12 in the permanent dentition (three on each side, upper and lower). They are grinding teeth, having large crowns and broad chewing surfaces. (Jablonski, Dictionary of Dentistry, 1992, p821)	Molars
D010155	Palatal Expansion Technique	An orthodontic method used for correcting narrow or collapsed maxillary arches and functional cross-bite. (From Jablonski's Dictionary of Dentistry),	Maxillary Expansion,Palatal Expansion Technic,Expansion, Maxillary,Palatal Expansion Technics,Palatal Expansion Techniques,Technic, Palatal Expansion,Technique, Palatal Expansion
D002508	Cephalometry	The measurement of the dimensions of the HEAD.	Craniometry
D006801	Humans	Members of the species Homo sapiens.	Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man