Compensatory Class III malocclusion treatment associated with mandibular canine extractions

Janson, Guilherme; Maranhão, Olga Benário Vieira

doi:10.1590/2177-6709.22.6.086-098.bbo

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BBO Case Report • Dental Press J. Orthod. 22 (06) • Nov-Dec 2017 • https://doi.org/10.1590/2177-6709.22.6.086-098.bbo linkcopy

Compensatory Class III malocclusion treatment associated with mandibular canine extractions

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

Skeletal Class III malocclusions are ideally treated with orthodontic-surgical approaches. However, if there are no significant soft tissue implications and the patient does not want to undergo orthognatic surgery, other treatment options may be considered. The current case report describes a compensatory alternative for Class III malocclusion treatment, by means of mandibular canine extractions. This treatment alternative provided facial profile and occlusal improvement, which remains stable seven years posttreatment.

Keywords:
Canine extraction; Class III malocclusion; Orthodontics; Corrective

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	Measurements		Normal	A	B	C	Dif. A/B
Skeletal pattern	SNA	(Steiner)	82^o	84.2^o	84.8^o	84.5^o	-0.6^o
	SNB	(Steiner)	80^o	86.1^o	84.5^o	83.9^o	-1.6^o
	ANB	(Steiner)	2^o	-1.9^o	0.2^o	0.5^o	+1.7^o
	Wits	(Jacobson)	♀ 0 ±2 mm ♂ 1 ±2 mm	-9.5 mm	-6.4 mm	-6.7 mm	+3.1 mm
	Angle of convexity	(Downs)	0^o	-6.4^o	-4.2^o	-3.3^o	+2.2^o
	Y-axis	(Downs)	59^o	58.5^o	58.3^o	61^o	-0.2^o
	Facial angle	(Downs)	87^o	95^o	95.6^o	93.1^o	+0.6^o
	SN-GoGn	(Steiner)	32^o	38.6^o	39.3^o	40^o	+0.7^o
	FMA	(Tweed)	25^o	33.3^o	32.9^o	35.2^o	-0.4^o
Dental pattern	IMPA	(Tweed)	90^o	73.1^o	71.3^o	75.1^o	-1.8^o
	1.NA (degrees)	(Steiner)	22^o	26.3^o	21.7^o	18.3^o	-4.6^o
	1-NA (mm)	(Steiner)	4 mm	5.1 mm	6.8 mm	5.6 mm	+1.7 mm
	1.NB (degrees)	(Steiner)	25^o	20.2^o	17.4^o	21.2^o	-2.8^o
	1-NB (mm)	(Steiner)	4 mm	3.7 mm	4.3 mm	5 mm	+0.6 mm
	- Interincisal angle	(Downs)	130^o	135.4^o	140.7^o	140^o	+5.3^o
	1-APo	(Ricketts)	1 mm	3.9 mm	2.2 mm	2.9 mm	-1.7 mm
Profile	Upper lip - S-line	(Steiner)	0 mm	-4 mm	-3.2 mm	-2.8 mm	-0.8 mm
Profile	Lower lip - S-line	(Steiner)	0 mm	1.6 mm	-0.4 mm	-0.4 mm	-2.0 mm