A clinical study on effects of distalization of whole upper arch in borderline Class II malocclusion using microscrew anchorages in inferiozygomatic area

Shanghai Journal of Stomatology ›› 2013, Vol. 22 ›› Issue (3): 310-315.

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A clinical study on effects of distalization of whole upper arch in borderline Class II malocclusion using microscrew anchorages in inferiozygomatic area

ZHANG Hong-jun¹, JI Guo-ping², SHEN Gang²

1.Fengxian Dental Hospital. Shanghai 201400; 2.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

Received:2013-03-11 Revised:2013-04-27 Online:2013-06-10 Published:2013-06-10
Supported by:
Supported by Medical Guide Project of Science and Technology Committee of Shanghai Municipality (09411964900).

Abstract

Abstract: PURPOSE: To investigate the effect of distalization of upper dentition using microscrew anchorages placed in inferiozygomatic area to correct borderline Class II malocclusion. METHODS: Nine borderline Class II cases aged from 13-17 years old, with moderate convex profile were selected. All cases were designed to extract upper second molars or third molar germs to provide space for distalization of upper dentition using microscrew anchorages placed in inferiozygomatic area. Cephalometrics before and after treatment were compared to analyze the movement of upper morlars and incisors, as well as the position change of upper and lower lips. The data were analyzed by paired t test with SPSS17.0 Software package. RESULTS: After an average of 14 months of treatment, all cases got improved profiles with correction of Class II dental relationship. The upper molars and incisors were pulled back 3.1 mm and 2.8 mm, respectively. No adverse root resorption or sinus infection caused by the microscrews was observed. CONCLUSIONS: Microscrew anchorages placed in inferiozygomatic area can be used to correct borderline Class II malocclusion by distalization movement of upper dentition with a better profile and no adverse complication.

Key words: Microscrew anchorage, Distalization, Borderline Class II malocclusion

CLC Number:

R783.5

ZHANG Hong-jun, JI Guo-ping, SHEN Gang. A clinical study on effects of distalization of whole upper arch in borderline Class II malocclusion using microscrew anchorages in inferiozygomatic area[J]. Shanghai Journal of Stomatology, 2013, 22(3): 310-315.

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A clinical study on effects of distalization of whole upper arch in borderline Class II malocclusion using microscrew anchorages in inferiozygomatic area

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