Orthodontic Treatment of Severe Class II, Division 2 Malocclusion; A Non Extraction Case - การรักษาทางทันตกรรมจัดฟันในการสบฟัน ผิดปรกติชนิด Class II, Division 2 อย่างรุนแรงโดยไม่ถอนฟัน

บทคัดย่อ

                    The most troublesome malocclusions in orthodontics are vertical dysplasias which are skeletal open bite and skeletal deep overbite malocclusion. Severe class II, division 2 malocclusion reveals specific characteristics such as sever crowding, retroclination of maxillary central incisors, proclination of maxillary lateral incisors or canines and sever excessive deep overbite. This malocclusion is one of the most difficult type to be treated successfully.

                     The patient illustrated in this report was a Thai boy aged 11 years 6 months at the beginning of the treatment (January 2003). He had severe class II, division 2 malocclusion with severe crowding, excessive deep overbite (upper incisors bit on lower gingiva) and class II molar relationship. He had a rather small and retrusive mandible. The treatment plan was to try non extraction and activate mandibular growth. After finishing of the treatment (October 2004), he has normal maxillary and mandibular relationship. Dental relationship was satisfactory with good intercuspation and severe excessive deep overbite was corrected.

Key words:      severe class II, division 2 malocclusion, non extraction