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ObjectiveThe aim of this trial was to compare the alignment efficiency and intermaxillary arch dimension changes of nickel-titanium (NiTi) or copper-nickel-titanium (CuNiTi) round archwires with increasing diameters applied sequentially to the mandibular arch.MethodsThe initial alignment phase of fixed orthodontic treatment with NiTi or CuNiTi round archwires was studied in a randomly allocated sample of 66 patients. The NiTi group comprised 26 women, 10 men, and the CuNiTi (27℃) group comprised 20 women, 10 men. The eligibility criteria were as follows: anterior mandibular crowding of minimum 6 mm according to Little's Irregularity Index (LII), treatment requiring no extraction of premolars, 12 to 18 years of age, permanent dentition, skeletal and dental Class I malocclusion. The main outcome measure was the alignment of the mandibular anterior dentition; the secondary outcome measure was the change in mandibular dental arch dimensions during 12 weeks. Simple randomization (allocation ratio 1:1) was used in this single-blind study. LII and mandibular arch dimensions were measured on three-dimensional digital dental models at 2-week intervals.ResultsNo statistically significant difference was observed between NiTi and CuNiTi according to LII (p > 0.05). Intercanine and intermolar arch perimeters increased in the CuNiTi group (p < 0.001). Inter-first premolar width showed a statistically significant interaction in week × diameter × application (p < 0.05).ConclusionsThe effects of NiTi and CuNiTi round archwires were similar in terms of their alignment efficiency. However, the intercanine and intermolar arch perimeters, and the inter-first premolar width changes differed between groups.

Occlusal cant is an important factor affecting smile esthetics.The dynamic display zone includes lateral, vertical, and anteroposterior aspects, as well as the cant of the occlusal plane. Smile design and mechanotherapy must take into account an esthetic plane of occlusion. The purpose of this review is to describe occlusal cant, examine its diagnosis, and explain the treatment alternatives for this condition.

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Turkish Journal of Orthodontics (Turk J Orthod) is an international, scientific, open access periodical published in accordance with independent, unbiased, and double-blinded peer-review principles. The journal is the official publication of Turkish Orthodontic Society and it is published quarterly on March, June, September and December. Turkish Journal of Orthodontics publishes clinical and experimental studies on on all aspects of orthodontics including craniofacial development and growth, reviews on current topics, case reports, editorial comments and letters to the editor that are prepared in accordance with the ethical guidelines. The journal's publication language is English and the Editorial Board encourages submissions from international authors.

Objective: The aim of our study was to investigate morphological differences in the upper airway of healthy men and women on lateral cephalometric radiographs. Material-Method: In our study, we evaluated 76 lateral cephalometric radiographs of adult subjects (38 men and 38 women) with class I skeletal pattern taken in natural head posture. In order to determine natural head posture, we used self-balance position, which was transferred to the cephalostat by means of a fluid level device. All lateral cephalograms were traced manually. The effect of gender on upper airway morphology and natural head posture was evaluated using Student's t-test. Results: We found that measurements used in the determination of natural head posture were similar for men and women. Linear measurements regarding the position of bony structures (MP-AH, AH-AH1, C3ia-AH, and Ba-C3ia), soft tissue (PNS-P, MPT, PNS-Et, TGL, and TGH), tongue area, soft palate area, and oropharynx area were statistically significant, with respect to gender. Conclusions: The hyocervical relation is affected by gender differences whereas hyomandibular relation is well balanced in subjects with normal occlusion and class I skeletal pattern and was not affected by gender. Natural head posture was not affected by gender differences. Tongue area, soft palate area, and oropharyx area are larger in men. However, no statistically significant differences were observed between genders for nasopharynx and hypopharyx areas.