Stress analysis of over-denture abutments treated with two obturation techniques

Abstract

Aim: Evaluation of stresses induced on over-denture abutments endodonticaly treated with two different obturation techniques.Materials and methods: eight mandibular permanent canines were inserted in four pesudo-realistic models. In each model two canines were placed in it. One canine was treated with lateral obturation technique and the other canine with vertical obturation technique. Four over-denture prostheses were fabricated on the four models. Then strain gauges were attached on the coronal one third of the root buccally and lingually for all eight canines. A metal rod was placed occlusally on the premolar –molar area, and a 50 N load was applied on the middle of the rod using the universal testing machine. Readings were collected. Results: from the collected data the lateral obturation showed 85.25±104.901 µε and the vertical obturation showed 4.875±3.555 µε with significance difference of P<0.05 between the groups.Conclusion: it can be concluded that the abutments treated with vertical obturation techniques reduced the stresses induced to the supporting structures when compared with the lateral condensation technique.

Effect of Obturation Technique on Stresses Induced in Telescopic Retained Partial Denture (In vitro Study)

“…50 Newtons were applied on both groups, with abutments obturated with lateral compaction showing a statistically significance difference in the stresses induced in the abutments when compared with abutments obturated with vertical compaction, https://oamjms.eu/index.php/mjms/index this result coincides with Elsherbini et al [10] In which, lateral compaction caused higher stresses in the abutment teeth than vertical compaction. This could be explained by the possible wedging action of the spreader within the root canal, either by direct contact with the root canal or indirectly through the guttapercha filling, which in turn exerts pressure on canal walls [16].…”

“…More than 60% success rate of Since 2002 https://oamjms.eu/index.php/mjms/index endodontically treated abutments was reported in short-span and long-span bridges [9]. Furthermore, changing of the obturation technique can have a direct effect on the stresses induced to the supporting structures in the over-denture prosthesis, thus affecting the long-term prognosis of the abutment teeth and the prosthesis [10].…”

“…Regarding both techniques, the hydraulic forces sent the gutta-percha in one or two unequal and unpredictable lateral or apical directions [13]. These types of stresses induced during obturation might have a future effect on root dentin affecting the longterm survival of the tooth, especially when used as an abutment liable to extra under stresses [10].…”

“…Finite element analysis is a widely used method, it utilizes computerized data and numerical methods in analyzing stress distribution [14]. Another method is the strain gauges, in which electronic gauges' measure stress induced in an object by applied load [10].…”