Aim: Materials used in orthodontic treatment can cause corrosion and metal ion release to the mouth. This study was aimed to examine the changes in the friction coefficients and corrosion resistance of the modified Ni-Ti arch wires. Methodology: Our sample consisted of 16 Ni-Ti arch wires (0.016 × 0.022 inches). Coating bathes involving Ni-Ti, Ni-Ti-Mo, and Ni-Ti-Cr were prepared for arch wires coating. New surfaces were analyzed by SEM, and the crystallographic structure was determined by X-rays. The friction coefficient of the coated wires was determined by nanoindentation. Artificial saliva was prepared as a corrosive condition. Impedance measurements were performed with an electrochemical analyzer. The AC impedance spectroscopy measurements were performed after four hours, seven, 15, 30, 45, and 60 days. Results: All groups were more resistant than the control group (-447 mV) [group 1 (-388 mV), group 2 (-328 mV), group 3 (-327 mV), group 4 (-427 mV), group 5 (-395 mV), group 6 (-366 mV), and group 7 (-380 mV)]. Friction coefficients of group 5 (0.252) and group 6 (0.265) were observed to be lower than those of the control group (0.288). Conclusion: In the results of our study, it was shown that the surface properties of Ni-Ti wires could be electrochemically improved. The coated wires (group 5 and group 6) had a remarkable corrosion resistance and reduced friction. The protocols that we used should help provide better-quality surfaces.   How to cite this article: Özyılmaz AT, Bilgiç Zortuk F, Yılmaz H. Evaluation of the surface properties of modified ni-ti arch wires. Int Dent Res 2021;11(Suppl.1):167-176. https://doi.org/10.5577/intdentres.2021.vol11.suppl1.25   Linguistic Revision: The English in this manuscript has been checked by at least two professional editors, both native speakers of English.

Objectives: Root resorption is one of the frequently encountered problems in orthodontic treatments. The effects of functional appliances on root resorption have not been clearly demonstrated. The aim of this study was to compare volumetric root resorption of mandibular incisors after Bionator and Forsus appliance treatment using cone-beam computed tomography (CBCT). Materials and Methods: The study sample (n = 30) was selected from Class II div. 1 mandibular retrognathia patients treated with the Bionator and Forsus appliances. The first CBCT scans were taken before Bionator use and after 6 months. In the Forsus group, the first CBCT scans were taken before Forsus appliance use and after an overcorrected Class I relationship was obtained. The mean treatment time with the Forsus appliance was 5 ± 1.2 months. Mimics software was used for segmentation and volumetric measurements of mandibular incisor teeth root resorption. Results: In the Bionator group, statistically significant root volume loss was not found. In the Forsus group, the differences between before and after the treatment were not statistically significant for teeth 41, 31, and 32 (P > 0.05), whereas the difference was statistically significant for the lower right second incisor (P < 0.002). The percentage of volume loss (%) and root volume loss (mm3) was not statistically significant between groups. Conclusions: Following functional treatment with the Bionator and Forsus, statistically significant difference was not found between groups for mandibular incisor root resorption.

Amaç: Bu anket çalışmasının amacı ülkemizde özel klinik, üniversite ya da devlet kurumunda çalışan ortodonti doktoru/uzmanı ve uzmanlık/doktora öğrencilerinin dijital ortodontik model kullanım yaygınlığını, bilgilerini ve tecrübelerini değerlendirmektir. Gereç ve Yöntemler: Türkiye'de çalışan 740 ortodonti uzmanı, doktora ve uzmanlık öğrencisine 20 sorudan oluşan bir anket gönderilmiştir. Mail yoluyla ve kongre, sempozyum ve toplantılarda 388 kişiye anket uygulanmıştır. Anket, demografik özellikler ve klinik özellikleri, dijital modele yönelik tutumları ve dijital model ile ilgili bölümlerden oluşmaktadır. Bulgular: 388 anketten elde edilen veriler analiz edilmiştir. Yanıt verenlerin yaş ortalaması 30 yıldır (dağılım: 23-55 yıl). Tüm prosedürler için 204 ortodontist (% 52.6) dijital modeli tercih etmiş, % 19.6'sı seminerlerden dijital model hakkında bilgi sahibi olduklarını bildirmiştir. Dijital modellerin kullanımında en sık belirtilen nedenler model kaybının ve model hasarının olmaması (% 44.8), ardından dijital görüntü üzerinde ölçüm yapabilmesidir (% 31.4). 300 ortodontist (% 77.3) dijital model hakkında daha fazla bilgi edinme isteğindedir. Sonuç: Verilerimiz dijital modelin ortodontistler tarafından yaygın olarak kullanıldığını göstermektedir; ortodontik tanı için dijital model tercihi, daha büyük teknik yetkinlik ile orantılı olarak artacaktır.

Ö ÖZ ZE ET T Bu çalışmada, karışık dişlenme döneminde dudak emme ve dil itimi alışkanlıklarının sebep olduğu ön açık kapanışın erken dönem ortodontik tedavisinin sunulması amaçlanmıştır. Sekiz yaşındaki kız olgu, açık kapanış şikâyetiyle kliniğimize getirildi. Yapılan muayenesinde; olgunun dil itimli yutkunma ve alt dudak emme alışkanlıklarına sahip olduğu saptandı. Olgunun zararlı alışkanlıklarının önlenmesi ve bu şekilde açık kapanışının tedavisi için sabit dil önleyici aparey ile lip bumper alışkanlık kırıcı apareyleri uygulandı. Olgu iki buçuk yıl süresince izlem altına alındı. Olgunun alışkanlık kırıcı apareylerle zararlı ağız alışkanlıklarını bıraktığı ve ön açık kapanış probleminin bu süreçte düzeldiği gözlemlendi.A An na ah h t ta ar r K Ke e l li i m me e l le er r: : Dil önleyici; lip bumper; ön açık kapanış A AB BS S T TR RA AC CT T The aim of this case report is to present orthodontic treatment of anterior openbite, which is caused by lip sucking and tongue thrust during mixed dentition. An 8-year-old girl was admitted to our clinic with openbite complaint. It was determined that the patient had tongue thrust and lower lip sucking habits. This patient treated with fixed tongue crib and lip bumper habit breaking appliances. The patient was followed for two and a half years. It was observed that the patient left the harmful mouth habits with the habit breaking devices and the problem of anterior openbite was treated in this process. K Ke ey yw wo or rd ds s: : Tongue crib; lip bumper; anterior openbite