Palatal displacement of canines and maxillary skeletal width

Motta

Dental Press J. Orthod.

2012

Objective:The purpose was to obtain information about the relation between agenesis and shape anomaly of maxillary lateral incisors and canine impaction. Methods: Seventy-three patients with canine impaction and 73 control patients, without canine impaction, were evaluated. The mesiodistal distances of the maxillary lateral incisors adjacent to the impacted canines and the correspondent mandibular lateral incisors were measured. The adjacent lateral incisors were classified in: 1 -absent, 2 -small, 3 -peg-shaped, 4 -standard. Results: The results showed that among the patients with impacted canines, there were 21 anomalous teeth (small and pegshaped) and among the control patients there were only three small and peg-shaped teeth, with a statistically significant difference (p = 0.001). No patients were found with impacted canines and absent lateral incisors. Conclusion: It was concluded that in patients with anomalous lateral incisors (small and peg-shaped) there is a probability to present impacted canines and this must be considered. Keywords:Incisors. Canine. Agenesis. Objetivo: o objetivo foi obter informação sobre a relação existente entre a agenesia e/ou anomalia de forma de incisivos laterais superiores e impacção de caninos. Métodos: foram avaliados 73 pacientes com impacção de caninos e 73 pacientes controle, sem impacção de caninos. Foram medidas as distâncias mesiodistais dos incisivos laterais superiores adjacentes aos caninos impactados e os incisivos laterais correspondentes inferiores. Os incisivos laterais adjacentes foram classificados em: 1 -ausentes; 2 -pequenos; 3 -conoides; 4 -normais. Resultados: os resultados mostraram que no grupo de pacientes com caninos impactados foram encontrados 22 dentes anômalos (pequenos e conoides), e no grupo controle apenas três dentes pequenos e conoides, sendo uma diferença estatisticamente significativa (p=0,001). Não foram encontrados pacientes com canino impactado e incisivo lateral ausente. Conclusão: concluiu-se que nos pacientes com incisivos laterais anômalos (pequenos e conoides), a probabilidade de apresentarem caninos impactados existe e deve ser considerada.. Palavras-chave:Incisivo. Dente canino. Anodontia.

Section: Discussionmentioning

confidence: 99%

Relation between agenesis and shape anomaly of maxillary lateral incisors and canine impaction

Motta

Dental Press J. Orthod.

2012

American Journal of Orthodontics and Dentofacial Orthopedics

“…14,22 These findings agree with the observations of several other authors. [13][14][15][16] On the other hand, the transverse dimension of the maxillary arch was constricted at the dentoalveolar level. Average maxillary intermolar widths of treated and untreated subjects at T1 were about 42 and 43 mm, respectively (Table).…”

Section: Discussionmentioning

confidence: 99%

“…12 On the other hand, several researchers found normal-to-wide maxillary arches in subjects with palatally impacted canines. [13][14][15][16] All interceptive approaches are based on diagnostic records from either panoramic radiographs or dental casts and are performed in the late mixed dentition. The diagnostic measurements for canine intraosseous displacement on panoramic films by Ericson and Kurol 6 are valid after the age of 10 to 11 years, when initial resorption of the roots of the deciduous canines is expected in the transition to the late mixed dentition.…”

mentioning

confidence: 99%

Interceptive treatment of palatal impaction of maxillary canines with rapid maxillary expansion: A randomized clinical trial

Baccetti

Mucedero

Leonardi³

et al. 2009

125

Introduction: Our aim in this prospective randomized clinical study was to assess the prevalence rate of eruption of palatally displaced canines, diagnosed at an early developmental stage with posteroanterior radiographs and consequently treated by rapid maxillary expansion. Methods: A sample of 60 subjects in the early mixed dentition with palatally displaced canines diagnosed on posteroanterior radiographs was enrolled in the trial. Their age range at the first observation (T1) was 7.6 to 9.6 years, with a prepubertal stage of skeletal maturity (CS1 or CS2). The 60 subjects were randomly allocated to the treatment group (TG, 35 subjects) or the no-treatment group (NTG, 25 subjects). The TG was treated with a banded rapid maxillary expander; after expansion, all patients were retained with the expander in place for 6 months. Thereafter, the expander was removed, and the patients wore a retention plate at night for a year. The NTG received no treatment. All subjects were reevaluated in the early permanent dentition (T2) (postpubertal CS4). The number of dropouts was recorded. The main outcome recorded at T2 was successful or unsuccessful eruption of the maxillary permanent canines. The starting forms at T1 for measurements on posteroanterior and panoramic films were compared in the 2 groups with the Mann-Whitney U test (P \0.05). The prevalence rates of successful and unsuccessful treatments in the TG were compared with those in NTG with chi-square tests (P \0.05). From T1 to T2, there were 3 dropouts in each group. Results: The final sample comprised 32 subjects in the TG and 22 subjects in the NTG. No statistically significant differences were found for any variable at T1. The prevalence rates of successful eruption of the maxillary canines were 65.7% (21 subjects) in the TG and 13.6% (3 subjects) in the NTG. The comparison was statistically significant (chi-square 5 12.4; P \0.001). Subjects with palatally displaced canines in the early mixed dentition do not have transverse deficiency of the maxillary arch. Conclusions: The use of a rapid maxillary expander as an early interceptive approach is effective for increasing the rate of eruption of palatally displaced canines. (Am J Orthod Dentofacial Orthop 2009;136:657-61)

“…On the other hand, Langberg and Peck 9 observed no difference in the anterior and posterior maxillary arch widths between subjects with PDCs and a comparison sample. Saiar et al 20 suggested that maxillary skeletal width is not a primary contributing factor in PDC. Other authors 23 reported that the anterior and posterior maxillary transverse dimensions were significantly greater in the PDC group than in their control.…”

Section: Discussionmentioning

confidence: 99%

“…Several studies 9,20,21 have been conducted to compare arch dimensions in subjects with PDC and normal subjects. No previous studies, however, compared dental arch dimensions between displacement and normal sides of unilateral PDC within the same individual.…”

Section: Discussionmentioning

confidence: 99%

Dental arch parameters of the displacement and nondisplacement sides in subjects with unilateral palatal canine ectopia

Al-Khateeb

Alhaija

Rwaite

et al. 2012

The Angle Orthodontist

Objective: To compare arch perimeter and teeth size, number, and shape between the two sides of the dental arch-the canine displacement side (DS) and the nondisplacement side (NDS)-in subjects with unilateral palatally displaced canine (PDC). Materials and Methods: Orthopantomograms (OPTs) of 240 subjects with unilateral PDC and 240 OPT matching controls were used. Additionally, study casts of 100 study subjects and 100 controls were used. The age of subjects ranged between 14 and 25 years. Dental casts were digitized and several parameters were recorded. Results: The transverse width from midpalatal line to the buccal segment and the palatal area on the DS was larger than that in the NDS (P , .05 to .001), with no difference in tooth size between both sides. Maxillary second premolars, canines, and lateral incisors in the PDC group were smaller than those in control group. Peg-shaped lateral incisors were significantly more frequent in the study group (P , .001). Conclusions: The transverse width of the DS was larger than that of the NDS. Both sides were generally smaller than those of the control group. Tooth size in the DS was comparable to that in the NDS but smaller than those of the control group. A missing or peg-shaped lateral incisor was the most common reported anomaly. (Angle Orthod. 2013;83:259-265.)