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CC BY-NC-ND 4.0 · Eur J Dent 2016; 10(01): 059-063
DOI: 10.4103/1305-7456.175696
Original Article
Dental Investigation Society

Rotation of the upper first molar in Class I, II, and III patients

Cristiane de Oliveira Viganó
1   Private Office, Campo Erê, SC, Brazil
,
Viviane Ekerman da Rocha
2   Private Office, Cidade Gaúcha, PR, Brazil
,
Laerte Ribeiro Menezes Junior
3   Private Office, Lagarto, SE, Brazil
,
Luiz Renato Paranhos
4   Department of Dentistry, Federal University of Sergipe, Lagarto, SE, Brazil
,
Adilson Luiz Ramos
5   Department of Orthodontics, State University of Maringá, Maringá, PR, Brazil
› Author Affiliations
Further Information

Publication History

Publication Date:
23 September 2019 (online)

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ABSTRACT

Objective: The aim of this study was to evaluate the mean rotation of the upper first molar (U1st M) in cast models from nontreated patients presenting: Class I, skeletal Class II, dental Class II, and skeletal Class III, comparing with Class I orthodontically treated patients. Materials and Methods: One hundred cast models were evaluated with five groups, composed of nontreated Class I (n = 20), dental Class II (n = 20), skeletal Class II (n = 20), skeletal Class III (n = 20), and treated Class I (n = 20). Measurements were taken from photocopies of the upper arches. The angle formed between a line crossing the mesiopalatal and the distal-buccalcusps of the U1st M and a line traced on mid palatal junction were measured in all samples. Results: One-way variance analysis showed that dental Class II group presented great mean rotation of the 1st molar (x = 78.95°, SD = 6.19) (P < 0.05), and in 85% of the patients from this group this angle was higher than 73°. Conclusions: The skeletal Class II and skeletal Class III groups showed similar mean position of the 1st molar, presenting rotation in approximately 50% of the patients. It can be concluded that upper molar rotation occurs mainly in dental Class II patients and shows higher mesial rotation angle.

Key words:

Angle Class II - malocclusion - molar - rotation
 

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