TABLE 2.

Characteristics of included studies assessing the load capacity of root‐filled teeth using finite element analysis

Year	Author	Type of access cavities	Tooth type	Single/Multiple loading points	Load magnitude in total	Load direction	Stress parameters	With experiments	Results
2020	Wang et al. (2020)	Conservative & traditional	Maxillary first molar	Multiple, four	800 N	Vertical	Maximum principal stress	No	Conservative endodontic cavity significantly reduced the concentration of tensile stress of dentine.
2020	Saber et al. (2020)	Conservative & traditional & truss	Mandibular first molar	Multiple	250 N	Vertical/oblique	Von Mises	No	Conservative and truss endodontic cavity designs had higher stress concentrated at the cervical line under oblique loading. The highest VM stress was recorded for the conservative access design.
2020	Franco et al. (2020)	Conservative & conventional	Maxillary first premolar	Multiple, two	100 N	Vertical/oblique	Displacement tensile stress	No	Conventional cavities presented higher displacement tensile stress.
2020	Guler (2020)	Ultraconservative & traditional	Maxillary first molar	Single	480 N, 240 N	Vertical/oblique	Von Mises	No	Ultraconservative cavities had higher maximum von Mises stresses than conventional ones.
2019	Zhang et al. (2019)	Conservative & modified & traditional	Maxillary first molar	Multiple (four points)	800 N	Vertical	Von Mises & maximum principal stress	No	The fracture resistance of an endodontically treated tooth was increased by preparing the conservative endodontic cavity.
2019	Roperto et al. (2019)	Conservative & traditional	Maxillary first premolar	Single	100 N	Oblique	Von Mises	With fracture test	No significant differences in the fracture resistance among different endodontic cavity designs.
2018	Jiang et al. (2018)	Conservative & traditional & extended	Maxillary first molar	Single & Multiple (four points)	800 N, 225 N	Vertical/oblique	Von Mises	No	Conservative access cavity reduced stress concentration on pericervical dentine.
2018	Allen et al. (2018)	Minimally invasive & straight‐line	Mandibular first molar	Multiple	100 N	Vertical/oblique	Von Mises	No	A traditional endodontic access cavity may render a tooth more susceptible to fracture compared with an minimally invasive access design.
2016	Yuan et al. (2016)	Minimally invasive & straight‐line	Mandibular first molar	Single	250 N	Vertical/oblique	Von Mises	No	Minimally invasive access preparation reduced the stress distribution in crown and cervical regions.