Effects of Endodontic Access Cavity Design and Thermocycling on Fracture Strength of Endodontically Treated Teeth

Figures & data

Figure 1 Teeth with TEC (A) and TREC (B) designs.

Figure 2 Determining the location and path of accessing the root canals through a TREC on the mesial and distal (A–C) and buccal and lingual (D and E) radiographs. The distance between the buccal and lingual surfaces of the teeth and also the distance between the mesial and distal surfaces of the teeth were determined (green and red dotted lines) and the perpendicular path to the occlusal surface was estimated to access the mesial and distal canal orifices such that the enamel-dentin bridge between the two access cavities was preserved. F shows the TREC access cavity and G shows the obturated canal along with a restored access cavity.

Figure 3 Photographs of the broken teeth in different groups of (A) control, (B) TEC, and (C) TREC.

Table 1 Cross-Sectional Diameters, Buccolingual (BL), Mesiodistal (MD) Diameters (mm) and Comparison of Fracture Loads (N) of the Teeth (n=10)

Group	N	BL	MD	BL x MD	Fracture (N) (SD)	P value*
Con	10	10.017	10.956	110.0324	1616.302^a±106.530	> 0.05
Con-TC	10	10.318	11.25	116.4863	1595.7^a±72.708
TREC	10	10.342	11.241	116.3963	1601.2^a±143.073	< 0.05
TREC _TC	10	10.286	11.397	116.254	1264.928^b±209.305
TEC	10	10.264	11.328	116.5389	1369.9^b±253.903	< 0.05
TEC-TC	10	10.16	11.007	112.2544	886.23^c±157.559
P value	60	> 0.05	> 0.05	> 0.05	< 0.05

Notes: P value: one-way Anova. P value*: independent t test (compare with TC and without TC). ^a,b,cTukey’s test for groups comparison.

Abbreviations: Control, con; Con-TC, control with thermocycling; TREC, truss endodontic access cavity; TREC-TC, truss endodontic access cavity with thermocycling; TEC, traditional endodontic cavity; TEC-TC, traditional endodontic cavity with thermocycling.