Department of Orthodontics, Kalinga Institute of Dental Sciences, KIIT (Deemed to be University), Bhubaneswar, Odisha, India.
Department of Prosthodontics, Crown and Bridge and Implantology, Vydehi Institute of Dental Sciences and Research Hospital, Bengaluru, Karnataka, India.
J Contemp Dent Pract. 2023 Apr 1;24(4):268-273. doi: 10.5005/jp-journals-10024-3470.
The present investigation aims to find out the prevalence of ectopic canines among skeletal class I, II, and III malocclusions and to evaluate its variability among different genders and their growth patterns.
The study sample included orthopantomograms (OPGs), lateral skull views, and study models of 999 patients collected from departmental archives. Among the selected samples, 258 were males and 738 were females. They were divided into skeletal class I, II, and III malocclusions sagittally and hypodivergent, normodivergent, and hyperdivergent groups according to their angle formed between point A-Nasion - point B (ANB) and angle formed between the Sella-Nasion (SN) plane and Gonion (Go) - Gnathion (Gn) plane (SnGoGn) values respectively.
Of the 999 samples, 738 (73.9%) were female and 260 (25.8%) were male patients. When compared to men, females had a higher proportion of ectopic canines. An estimated 62.3% of skeletal class I, 29.1% of skeletal class II, and 8.6% of skeletal class III cases were found to have ectopic canines. An estimated 720 (72.1%) patients were found to have maxillary ectopic canines and out of the available sample, 474 patients have horizontal growth patterns, 335 have average growth patterns and 190 patients have vertical growth patterns. Labial impaction was the commonest (65.4%) followed by palatal (24.8%). Bilateral impaction was comparatively more (51.1%) than unilateral impaction (48.2%). Maxilla was more prevalent (72.1%) as compared to the mandible (16.3%) and for both the arches it was (11.6%). Ectopic canines were identified in a total of 62.3% of cases with skeletal class I, 29.1% of cases with skeletal class II, and 8.6% of cases with skeletal class III.
The bilateral ectopic canine was mostly seen in skeletal class I and class III malocclusions, whereas, a unilateral presentation was mostly seen in skeletal class II malocclusions.
Knowing the likelihood of a maxillary canine erupting ectopically will aid clinicians in starting with interceptive therapy since this condition necessitates complex orthodontic mechanics.
本研究旨在调查骨性 I 类、II 类和 III 类错颌中异位尖牙的患病率，并评估其在不同性别中的变异性及其生长模式。
研究样本包括从科室档案中收集的 999 名患者的全景片、侧颅面片和研究模型。在所选样本中，258 名为男性，738 名为女性。根据 ANB 角和 Sella-Nasion（SN）平面与 Gonion（Go）-Gnathion（Gn）平面（SnGoGn）值形成的角度，他们被分为骨性 I 类、II 类和 III 类错颌，矢状和低角、均角和高角组。
在 999 名样本中，738 名（73.9%）为女性，260 名（25.8%）为男性患者。与男性相比，女性异位尖牙的比例更高。估计骨性 I 类有 62.3%、骨性 II 类有 29.1%、骨性 III 类有 8.6%的病例有异位尖牙。估计 720 名（72.1%）患者有上颌异位尖牙，在可利用的样本中，474 名患者有水平生长模式，335 名患者有平均生长模式，190 名患者有垂直生长模式。唇侧埋伏是最常见的（65.4%），其次是腭侧（24.8%）。双侧埋伏比较单侧埋伏更为常见（51.1%比 48.2%）。上颌比下颌更为常见（72.1%比 16.3%），对于两个牙弓，都是（11.6%）。骨性 I 类有 62.3%、骨性 II 类有 29.1%、骨性 III 类有 8.6%的病例中发现了异位尖牙。
双侧异位尖牙多见于骨性 I 类和 III 类错颌，而单侧多见于骨性 II 类错颌。
了解上颌尖牙异位萌出的可能性将有助于临床医生开始进行阻断性治疗，因为这种情况需要复杂的正畸力学。
