Fracture resistance of roots enlarged with various rotary systems and filled with various sealers

Abstract

Background. This in vitro study compared the fracture resistance of roots instrumented either with ProTaper or One Shape rotary systems and filled with one of the silicate, epoxy resin or silicone-based sealers. Methods. Sixty single-rooted extracted mandibular premolars were decoronated to a length of 13 mm and then randomly divided into two main groups (n=30) in terms of the rotary system used for preparation. Group 1 samples were instrumented with the ProTaper Universal system up to a master apical file of #F2, while samples in group 2 were enlarged with One Shape system. The two main groups were then divided into 3 subgroups in terms of the sealer used (n=10) and filled with guttapercha (either F2 or MM-GP points) of the rotary system used and one of the sealers as follows: group 1, BioRoot RCS + ProTaper F2 gutta-percha; group 2, AH Plus + ProTaper F2 gutta-percha; group 3, GuttaFlow + ProTaper F2 gutta-percha; group 4, BioRoot RCS+ MM-GP points; group 5, AH Plus + MM-GP points; and group 6, GuttaFlow + MM-GP points. Each specimen then underwent fracture testing by using a universal testing machine at a crosshead speed of 1.0 mm/min until the root fractured. Data were statistically analyzed. Results. Two-way ANOVA showed no significant differences between the groups. One Shape instruments showed significantly better fracture resistance compared to ProTaper instruments. Statistically, no significant difference was found between AHPlus, GuttaFlow and BioRoot RCS sealers. Conclusion. It can be concluded that the rotary system used for the instrumentation of teeth has some influence on the fracture resistance, while the root canal sealers do not have such an effect.

Physico-Chemical Properties of Calcium-Silicate vs. Resin Based Sealers—A Systematic Review and Meta-Analysis of Laboratory-Based Studies

“…The main characteristics of the included studies are shown in Table 3 . Ten studies on the adaptation to root canal walls were included [ 30 , 31 , 32 , 35 , 36 , 37 , 38 , 39 , 40 , 41 ]. In comparison to the RBS, CSBs showed similar values of void volume marginal adaptation in five studies [ 32 , 36 , 37 , 38 , 39 ] whilst at the apical, mid, and coronal thirds, these values were high in three studies [ 31 , 35 , 41 ] and low in one study [ 38 ].…”

“…Four studies on fracture resistance were included [ 36 , 37 , 54 , 56 ] with values (FRV) mentioned in Newton unit and time intervals ranged from one week to a month. CSBs demonstrated similar FRVs when compated to RBS in three studies [ 36 , 37 , 56 ], whilst had superior values in one study [ 54 ].…”

Farkli Ni̇kel-Ti̇tanyum Döner Alet Si̇stemleri̇ni̇n Farkli Ki̇nemati̇klerde Kullaniminin Endodonti̇k Tedavi̇ Görmüş Kökleri̇n Kirilma Di̇renci̇ne Olan Etki̇si̇ni̇n İncelenmesi̇

“…PTU ve One Shape (MicroMega, Besançon, Fransa) döner aletlerinin köklerin kırılma direncine olan etkisinin incelendiği başka bir çalışmada, PTU ile genişletilen köklerin daha az dirençli olduğu görülmüştür. 40 Kök kanallarının şekillendirilmesi süresince kalan dentin miktarının azalması ile dişlerin kırılma dirençlerinin azalması kaçınılmazdır, ancak döner aletler ile kök kanalları şekillendirilirken kırılma direncini etkileyen tek faktör kalan dentin miktarı değildir. Araştırmacılar NiTi döner aletlerin kesit ve eksen özelliklerine ve esnekliklerine bağlı olarak, dentin duvarıyla temas ettikleri bölgelerde oluşturdukları streslerle el aletlerine oranla, dentinde çatlak hattı, parsiyel veya vertikal kırık gibi dentin çatlaklarının oluşma riskinin arttığını ve bu çatlakların, kanal doldurma ve çiğneme kuvvetlerinin etkisiyle vertikal kök kırığına dönüşme ihtimalinin yüksek olduğunu belirtmişlerdir.…”

Accuracy of cone-beam CT in detecting vertical root fractures in teeth with post-endodontic restorations: an in vitro study

“…Bernardes et al (2009) also reported statistically significant differences between periapical radiographs and CBCT for the diagnosis of root fractures, with better results for CBCT. Although some authors suggest that root canal sealers can affect the resistance and the pattern of the fracture (Lertchirakarn, Timyam, & Messer, 2002), and that, especially glass ionomer cement can strengthen the root dentin (Trope & Ray, 1992), more recent investigations have concluded that sealers have no effect on fracture resistance (Yusufoglu, Akman, Akbulut, & Eldeniz, 2019).…”