Dentin Thickness at Danger Zone and Canal Morphology of Maxillary Molars/Debljina dentina u zoni opasnosti i morfologija kanala maksilarnih kutnjaka

• Published in: Acta stomatologica croatica Vol. 56; no. 1; p. 50
• Main Authors: Yanik, Deniz, Nalbantoglu, Ahmet Mert
• Format: Journal Article
• Language: English
• Published: Sveuciliste U Zagrebu 01.03.2022
• ISSN: 0001-7019; 1846-0410
• DOI: 10.15644/asc56/1/6

Objectives: Dentin thickness in concave areas of the root creates risk for complications such as strip perforation during endodontic treatment. The study aims to examine dentin thickness of the danger (DZ) and safety zone (SZ), canal configuration, and the presence of isthmus in the mesiobuccal root of maxillary molars. Material and methods: Cone-beam Computed Tomography (CBCT) images of 1251 teeth belonging to 642 patients were retrospectively reviewed. The dentin thicknesses at DZ and SZ in maxillary molars with one (MB) or two mesiobuccal canals (MB1, MB2) were measured at the 3 mm apical to the furcation level. Vertucci's canal configurations and the isthmus rate were recorded. The Chi-square test andThe Student's t-test were performed. Results: MB2 rate was higher in maxillary first molars (61.68%) than second molars (39.36%). Isthmus rates were 27.3% and 44.11% in first and second molars. DZ thickness was thinner than the dentin thickness in the SZ in both first and second molars with one or two mesial canals (p< 0.05). In teeth with single canal, the mean DZ thickness was 0.88mm. In teeth with two canals, the mean DZ thicknesses were 0.83mm and 0.80mm for MB1 and MB2 canals, respectively. Conclusion: MB2 rate was higher in the first molar (61.68%), and the isthmus rate was higher in the second molar (44.11%). DZ and SZ were thinner in MB2 than in MB1 at the maxillary molars with two mesial canals. The results indicated that more conservative preparation must be applied to the MB2 canal in the maxillary molars. Svrha: Debljina dentina u konkavnim podrucjima korijena rizicna je zbog komplikacija kao što je perforacija racvanja korjenova tijekom endodontskoga lijecenja. Željela se ispitati debljina dentina opasne (DZ) i sigurnosne zone (SZ), konfiguracija kanala i isthmus u meziobukalnome korijenu maksilarnih kutnjaka. Materijali i metoda: Retrospektivno su kompjutoriziranom tomografijom (CBCT) pregledane slike 1251 zuba 642 pacijenta. Debljine dentina na DZ-u i SZ-u u maksilarnim kutnjacima s jednim (MB) ili dvama meziobukalnim kanalima (MB1, MB2) izmjerene su 3 mm apikalnoj do razine furkacije. Zabilježene su konfiguracije Vertuccijeva kanala i brzina isthmusa. Primijenjeni su Hi-kvadrat test i Studentov t-test. Rezultati: Stopa MB2 bila je veca u maksilarnim prvim kutnjacima (61,68 %) nego u drugim kutnjacima (39,36 %). Stope isthmusa bile su 27,3 % i 44,11 % u prvome i drugome kutnjaku. DZ je tanji od dentina u SZ-u te kod prvoga i drugoga kutnjaka s jednim ili dvama mezijalnim kanalima (p < 0,05). Kod zuba s jednim kanalom srednja debljina DZ-a bila je 0,88 mm. U zubima s dvama kanalima prosjecne debljine DZ-a bile su 0,83 mm, odnosno 0,80 mm za kanale MB1 i MB2. Zakljucak: Stopa MB2 bila je veca u prvome molaru (61,68 %), a stopa isthmusa u drugome molaru (44,11 %). DZ i SZ bili su tanji u MB2 nego u MB1 na maksilarnim kutnjacima s dvama mezijalnim kanalima. Rezultati su pokazali da je potrebno konzervativnije preparirati MB2 kanal u maksilarnim kutnjacima.