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

Abstract

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.)

Association between maxillary lateral incisors' root volume and palatally displaced canines: An instrumental variables approach to the guidance theory

“…in the apical third), 12 which is in agreement with the current findings. However, as overall toothsize discrepancies have been reported between PDC and non-PDC patients, 19 a split-mouth design, as chosen herein, might be superior due to the withinsubject comparison between the impaction and eruption side. Particularly, MxI2 size anomalies appear to occur more commonly bilaterally (but not necessarily to the same extent), despite PDC occurring far more commonly (60% to 75%) unilaterally.…”

Space conditions, palatal vault height, and tooth size in patients with and without palatally displaced canines: A prospective cohort study

“…In most of the studies cited above, morphological characteristics have been evaluated using measurements made using a variety of methods, such as plaster cast models, [15][16][17][20][21][22] panoramic radiographs, 23 cephalograms, 18,24 or cone-beam computed tomography. 25 However, these studies have shortcomings, such as inclusion of selected cases, analysis of retrospective material, or inclusion of impacted canines without specifying their location or whether there is unilateral or bilateral displacement.…”

Third molar tooth agenesis and pattern of impaction in patients with palatally displaced canines

“…The presence of generalized tooth-size reduction previously reported in PDC patients may explain this finding. 32 Third molar space width was reduced in PDC patients, which may explain the high third molar impaction rate reported in patients with PDC in the current study. This confirms previous reports that a shortage of retromolar space was a major factor in the etiology of third molar impaction.…”