The effect of calcium hydroxide on dentine composition and root fracture resistance of human teeth: An in vitro study

2021 ◽  
Author(s):  
Ahmad S. Al‐Hiyasat ◽  
Hamza S. El‐Farraj ◽  
Mohammad A. Alebrahim
Keyword(s):  
Calcium Hydroxide ◽  
Fracture Resistance ◽  
In Vitro Study ◽  
Vitro Study ◽  
Human Teeth ◽  
Root Fracture ◽  
Root Fracture Resistance

scholarly journals Mathematical validation of measurement of root fracture resistance: an in vitro study

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Rafat Bagheri ◽  
Abbas Abbaszadegan ◽  
Mohammad R. Nabavizadeh ◽  
Maryam Ferooz ◽  
Peter Parashos
Keyword(s):  
Fracture Resistance ◽  
Testing Machine ◽  
In Vitro Study ◽  
Maximum Load ◽  
Control Groups ◽  
Root Fracture ◽  
Root Canals ◽  
Gutta Percha ◽  
Root Fracture Resistance

Abstract Background The aim of this study was to develop a mathematically valid method of assessing fracture resistance of roots. The model developed used mesial roots of lower molars instrumented using stainless steel hand files (SS) and two rotary nickel-titanium (NiTi) systems. Methods Eighty human lower molars were selected and randomly divided into four groups (n = 20). After instrumentation, the root canals were obturated using thermoplasticized gutta percha. The roots were covered with a simulated periodontal ligament and mounted vertically in autopolymerizing acrylic in PVC tubes. Using a universal testing machine, the force to fracture (N) was applied and the maximum load (FL) was recorded. Remaining dentine volume was calculated and the fracture resistance (FR) was recorded. The data were analyzed using SPSS version 22 with P < .05. Results There were no significant differences among the instrumentation methods for FL but in FR the roots instrumented using rotary NiTi showed significantly lower values than control groups and SS files (P < 0.001). Conclusions Considering the effect of root length, volume of the root, and volume of the instrumented canal as well as the maximum failure load may be a more objective method of reporting fracture resistance of roots.

scholarly journals Mathematical Validation of Measurement of Root Fracture Resistance: An in Vitro Study.

2021 ◽  
Author(s):  
Rafat Bagheri ◽  
Abbas Abbaszadegan ◽  
Mohammad R Nabavizadeh ◽  
Maryam Ferooz ◽  
Peter Parashos
Keyword(s):  
Fracture Resistance ◽  
Testing Machine ◽  
In Vitro Study ◽  
Maximum Load ◽  
Control Groups ◽  
Root Fracture ◽  
Root Canals ◽  
Gutta Percha ◽  
Root Fracture Resistance

Abstract Background: This study aimed to develop a mathematically valid method of assessing fracture resistance of roots. The model developed used mesial roots of lower molars instrumented using stainless steel hand files (SS) and two rotary nickel-titanium (NiTi) systems. Methods: Eighty human lower molars were selected and randomly divided into four groups (n=20). After instrumentation, the root canals were obturated using thermoplasticized gutta percha. The roots were covered with a simulated periodontal ligament and mounted vertically in autopolymerizing acrylic in PVC tubes. Using a universal testing machine, the force to fracture (N) was applied and the maximum load (FL) was recorded. Remaining dentin volume was calculated and the fracture resistance (FR) was recorded. The data were analyzed using SPSS version 22 with P < .05.Results: There were no significant differences among the instrumentation methods for FL but in FR the roots instrumented using rotary NiTi showed significantly lower values than control groups and SS files (P <0.001). Conclusions: Considering the effect of root length, volume of the root, and volume of the instrumented canal as well as the maximum failure load may be a more objective method of reporting fracture resistance of roots.

Influence of Apical Patency, Coronal Preflaring and Calcium Hydroxide on the Accuracy of Root ZX Apex Locator for Working Length Determination: An In Vitro Study

2021 ◽  
pp. 232020682110361
Author(s):  
Mostafa Godiny ◽  
Reza Hatam ◽  
Roya Safari-Faramani ◽  
Atefeh Khavid ◽  
Mohammad Reza Rezaei
Keyword(s):  
Calcium Hydroxide ◽  
Root Canal ◽  
In Vitro Study ◽  
Study Groups ◽  
Vitro Study ◽  
Rank Test ◽  
Extensive Experience ◽  
Human Teeth ◽  
Working Length

Aim: One of the main steps in a successful endodontic treatment is determining the correct working length (WL) of the root canal. In this regard, electronic apex locators (EAL) have been widely used for measuring the WL. The accuracy of EALs in determining the WL may be influenced by various factors. This study is aimed to evaluate the effects of apical patency, coronal preflaring, and calcium hydroxide on the accuracy of the EAL. Materials and Methods: In this in vitro study, 20 central incisor single-rooted human teeth with fully formed apex were considered. Then, samples were randomly divided into two study groups, ten samples in each group. The WL was determined and recorded at 0.5 mm distance to the apex using Root ZX apex locator before and after creating patency, coronal preflaring, and calcium hydroxide administration. All WLs were measured separately for each tooth and reviewed independently by two experienced operators with extensive experience in using EALs. Paired t test and Wilcoxon signed-rank test were applied and the significant level was at .05. Results: Statistical analysis of the obtained data showed a significant decline in the WL after apical patency and coronal preflaring ( P < .05). Moreover, WL exhibited a significant enhancement after calcium hydroxide application ( P < .05). Conclusion: Apical patency and coronal preflaring increased the accuracy of apex locators in determining the WL of the teeth. Besides, calcium hydroxide residues in the root canal reduced the accuracy of the apex locator.

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