Volkan Arıkan

Comparison of micro-computerized tomography and cone-beam computerized tomography in the detection of accessory canals in primary molars

Purpose This study was performed to compare the accuracy of micro-computed tomography (CT) and cone-beam computed tomography (CBCT) in detecting accessory canals in primary molars. Materials and Methods Forty-one extracted human primary first and second molars were embedded in wax blocks and scanned using micro-CT and CBCT. After the images were taken, the samples were processed using a clearing technique and examined under a stereomicroscope in order to establish the gold standard for this study. The specimens were classified into three groups: maxillary molars, mandibular molars with three canals, and mandibular molars with four canals. Differences between the gold standard and the observations made using the imaging methods were calculated using Spearmans rho correlation coefficient test. Results The presence of accessory canals in micro-CT images of maxillary and mandibular root canals showed a statistically significant correlation with the stereomicroscopic images used as a gold standard. No statistically significant correlation was found between the CBCT findings and the stereomicroscopic images. Conclusion Although micro-CT is not suitable for clinical use, it provides more detailed information about minor anatomical structures. However, CBCT is convenient for clinical use but may not be capable of adequately analyzing the internal anatomy of primary teeth.

Root canal filling in primary molars without successors: Mineral trioxide aggregate versus gutta-percha/AH-Plus.

The aim of this study was to compare the clinical and radiographical success of mineral trioxide aggregate (MTA) and gutta-percha/AH-Plus used as a root canal filling material in primary second molars without successors. A total of 16 patients (9 girls, 7 boys) aged 6-13 years (mean: 10.5) were selected and randomly distributed into the treatment groups. Children were recalled for clinical and radiographic examination at 6, 12, 18, 24 and 36 months. Differences in treatment outcomes were analysed using chi-squared and Fishers exact tests. Clinically, there was no significant difference in the success rates between the groups at the end of a 3-year follow-up period (MTA: 100%; Gutta-percha/AH-Plus: 70%) (P > 0.05). However, radiographically, there was a significant difference between the groups (MTA: 80%; gutta-percha/AH-Plus: 30%) (P < 0.05). The present study showed that MTA can be recommended for use in root canal treatment of primary molars without successors based on better radiographic success.

KIRIKKALE İLİNDE YAŞAYAN 3-6 YAŞLARI ARASINDAKİ ÇOCUKLARDA SÜT DİŞİ DENTAL EROZYON PREVALANSININ DEĞERLENDİRİLMESİ

Amac: Bu arastirmanin amaci Kirikkale’deki cocuklarin sut dislerinde dental erozyonun prevelansini ve risk faktorlerini belirleyerek erken teshis ile gerekli onlemlerin alinmasina yardimci olmaktir. Gerec ve Yontem: Calismaya, 3-6 yaslari arasindaki 300 adet cocuk dahil edilmistir. Klinik muayene oncesinde, 30 soruluk bir anket hasta ve velisine uygulanmistir. Anket; hastaya ait sosyodemografik bilgiler, beslenme aliskanliklari, sistemik hastaliklar ve kullanilan ilaclar gibi erozyonda etkisi olabilecek faktorleri icermektedir. Klinik inceleme reflektor altinda, dental ayna kullanilarak bir arastirmaci (K.N.V) tarafindan yapilmistir. Eroziv lezyonlarin degerlendirilmesinde Basic Erosive Wear Examination (B.E.W.E) skorlama sistemi kullanilmistir. 6 bolgeden kaydedilen skorlar toplanarak Toplam BEWE Skoru elde edilmektedir. Calismada elde edilen veriler SPSS 20 paket programi ile analiz edilmistir. Gruplar arasindaki farkliliklar incelenirken degiskenlerin normal dagilim gostermemesi nedeniyle Mann Whitney U ve Kruskal Wallis-H Testlerinden yararlanilmistir. Bulgular: Arastirmaya dahil edilen cocuklarin sut dislerinde erozyon prevelansi %96 olarak tespit edilmistir. Degerlendirme sonucunda, 288 cocukta dental erozyondan etkilenmis en az bir yuzey gozlenirken, 12 cocukta herhangi bir asinma tespit edilmemistir. Toplam BEWE skorunun ortalama degeri 3,06 olarak hesaplanmis, en dusuk ortalama skor 3 yasindaki cocuklarda, en yuksek ortalama skor ise 5 yasindaki cocuklarda gozlenmistir. Arastirmamizda, sosyoekonomik durum arasinda istatistiksel olarak anlamli iliski bulunmus, sosyoekonomik duzeyi 2000 TL ve uzerinde olan hastalarin toplam anterior skor degerlerinin 1000 TL ve alti ve 1500-2000 TL arasinda olanlara gore anlamli derecede dusuk oldugu gozlenmistir. Agiz kurulugu olmayan cocuklarin Toplam Maksiller Skor degeri ve Toplam Anterior Skor degeri agiz kurulugu olanlara gore anlamli derecede dusuk bulunmustur (p<0.05). Sonuc: Ic Anadolu bolgesinde yasayan 3-6 yas arasindaki cocuklarin sut dislerinde dental erozyon prevelansinin yuksek oldugu tespit edilmistir.

Fracture Resistance of Incisal Fragments Following Reattachment With Different Techniques in Simulated Crown Fractures

Introduction: The aim of the present study was to evaluate and compare the effect of acidetching and Er, Cr:YSGG laser treatment before the reattachment of incisal fragments in coronal fractures of permanent incisor teeth. Methods: Sixty-six sound human maxillary incisors were randomly divided into 3 groups (n=22). Teeth were embedded in self-cure acrylic resins by leaving one-third of the crowns out, and uncomplicated crown fractures were obtained using an Instron testing device. The fragments were reattached using 3 different procedures and a hybrid resin composite (Z250): Group I: Acid etching + Prime & Bond NT; Group II: Er,Cr:YSGG + Prime & Bond NT; Group III: Er,Cr:YSGG + Acid etching + Prime & Bond NT. The percentages of shear bond strengths were determined by comparing fracture strengths of sound and reattached teeth for 3 groups. All data were analyzed statistically with Kruskal-Wallis H test. Results: Mean fracture strengths of the reattached fragments were between 51.02% and 62.93% of that of the sound teeth in all groups. Group I had significantly higher percentages of shear bond strength values (P<0.05) when compared to group II and group III. No significant difference (P>0.05) was found between group II and group III. Conclusion: The findings of the present study show that Er,Cr:YSGG laser irradiation prior to the reattachment of incisal fragments has a negative effect on fracture strength.

Shear bond strength of different restorative materials to mineral trioxide aggregate and Biodentine

Significance of Study: Mineral trioxide aggregate (MTA) and Biodentine (calcium silicate-based materials) have great importance in dentistry. There is no study comparing the bond strength of Biodentine and MTA for composite, compomer, and compomer or resin-modified glass ionomer (RMGIC). Although many advantages of Biodentine over MTA; in this study, MTA has shown better shear bond strength (SBS) to restorative materials. Aim: Recently, a variety of calcium silicate-based materials are often used for pulp capping, perforation repair, and endodontic therapies. After those treatment procedures, teeth are commonly restored with composite resin, (RMGIC materials in pediatric dentistry. The aim of this study was to evaluate the SBS of composite resin (Filtek™ Z250; 3M ESPE, USA), compomer (Dyract XP; LD Caulk/Dentsply, USA), and resin-modified glass ionomer (Photac-Fil Quick Aplicap; 3M ESPE, USA) to white MTA and Biodentine. Materials and Methods: Ninety acrylic cylindrical blocks were prepared and divided into two groups (n = 45). The acrylic blocks were randomly allocated into 3 subgroups; Group-1A: MTA + composite (Filtek™ Z250), Group-1B: MTA + compomer (Dyract XP), Group-1C: MTA + RMGIC (Photac-Fil Quick Aplicap), Group-2A: Biodentine + composite, Group-2B: Biodentine + compomer, Group-2C: Biodentine + RMGIC. The specimens were mounted in Universal Testing Machine. A crosshead speed 1 mm/min was applied to each specimen using a knife-edge blade until the bond between the MTA/Biodentine and restorative material failed. Failure modes of each group were evaluated under polarized light microscope at ×40 magnification. Results: There was no statistically significant difference between MTA + Composite resin with MTA + Compomer; and MTA + RMGIC with Biodentine + RMGIC (P > 0.05). There were statistically significant differences between other groups (P < 0.05). Conclusions: The results of the present study displayed that although many advantages of Biodentine over MTA; MTA has shown better SBS to compomer and composite resin materials than Biodentine.