scholarly journals Comparative evaluation of apical constriction position in incisor and molar teeth: An in vitro study

2018 ◽  
Vol 12 (02) ◽  
pp. 237-241
Author(s):  
Seyed Amir Mousavi ◽  
Alireza Farhad ◽  
Shirin Shahnaseri ◽  
Abbas Basiri ◽  
Erfan Kolahdouzan
Keyword(s):  
Root Canal ◽  
Statistical Significance ◽  
In Vitro Study ◽  
T Test ◽  
Reference Points ◽  
Root Canal Filling ◽  
Apical Constriction ◽  
Molar Teeth ◽  
The Mean

ABSTRACT Objective: The apical constriction (AC) and the apical foramen (AF) are the principal reference points used to determine the apical limit for instrumentation and root canal filling. AC varies in different races, and the aim of the current study was to measure and compare the distances from AC to AF and the anatomical apex (AA) in incisor and molar teeth in the Iranian population. Materials and Methods: Forty-five roots of incisor teeth and 45 roots of molar teeth were selected randomly in Isfahan Province, Iran. If the foramen was located toward the mesial or distal side of the apex, the cut was made mesiodistally, and if it was toward the buccal or lingual side, the section was made accordingly. Roots were examined under a microscope at ×25 magnification. The distances from AC to AF and AA were then estimated using a Motic camera. Descriptive statistics were used. The independent t-test was also used to compare distances in incisors and molars, and P = 0.05 was deemed to indicate statistical significance. Results: The mean distances between AC and AF were 0.847 ± 0.33 mm in incisors and 0.709 ± 0.27 mm in molars. The mean distances between AC and AA were 1.23 ± 0.39 mm in incisors and 1.01 ± 0.38 mm in molars. In an independent t-test, the distances between AC and AF differed significantly in incisors and molars (P = 0.035), but the distances between AC and AA did not (P = 0.172). Conclusion: The end points for root canal therapy should be 0.85 mm in incisors and 0.70 mm in molars.

scholarly journals The effect of environment (Dry and Natural Saliva) on clasp retention: In vitro study - Part I

2017 ◽  
Vol 11 (03) ◽  
pp. 352-356
Author(s):  
Bilal Mourshed ◽  
Nashwan Mohammed Qaed ◽  
Hashem Motahir Al-Shamiri ◽  
Nader Alaizari ◽  
Saleh Sulaiman Alhamdah ◽  
...  
Keyword(s):  
Statistical Analysis ◽  
In Vitro Study ◽  
T Test ◽  
Wilcoxon Test ◽  
Paired Sample ◽  
Crosshead Speed ◽  
Test Models ◽  
Molar Teeth ◽  
The Mean

ABSTRACT Objective: The purpose of this study was to investigate the importance of environments (dry and wet) to dislodge the clasp. Materials and Methods: Mandibular test models with natural premolar and molar teeth were used to test four types of clasp (each 12) (Akers, rest plate Akers [RPA], half and half [H-H], and ring clasp) in dry and natural fresh saliva environments. Each clasp was pulled out 10 times with a crosshead speed of 10 mm/min and the force required to withdraw each was measured. Statistical Analysis Used: A paired sample t-test and Wilcoxon test were used. Results: There were significant differences between the dry and wet (natural fresh saliva) environment. However, while the mean of the environment for RPA and ring clasp type was significantly different, the H-H and Akers clasp type was not. Conclusion: The environment has an effect on dislodging the clasp but differs according to the type of clasp.

scholarly journals Antimicrobial Activity of Two Root Canal Filling Pastes in Deciduous Teeth: an in Vitro Study

2015 ◽  
Vol 17 (1) ◽  
pp. 5
Author(s):  
Andréia Bolzan de Paula ◽  
Janaina De Cássia Orlandi Sardi ◽  
Mariana Minatel ◽  
Regina Maria Puppin-Rontani
Keyword(s):  
Antimicrobial Activity ◽  
Root Canal ◽  
Antimicrobial Property ◽  
Brain Heart Infusion ◽  
In Vitro Study ◽  
Biological Properties ◽  
Deciduous Teeth ◽  
Root Canal Filling ◽  
Agar Diffusion Test

<p>Endodontic treatment in deciduous teeth is very important so that we can preserve the primary dentition and thus promote appropriate craniofacial development. However, the use of filling pastes that have some important biological properties for the preservation of the tooth is required. The objective this study was to evaluate the in vitro antimicrobial activity of two root canal filling pastes in deciduous teeth, Vitapex® and Calcipex®, on microbial species commonly found in endodontic infections (Candida albicans, Enterococcus faecalis, Streptococcus mutans, Streptococcus sanguinis, Escherichia coli and Staphylococcus aureus), using the agar diffusion test. The experiment was carried out on BHI (Brain Heart Infusion) plates in four equidistant points, which were immediately filled with the sealers Vitapex® and Calcipex®. The<br />chlorhexidine gluconate 1% (CHX) and distilled water were used as positive and negative controls, respectively. After incubation of plates at 37 °C for 24 h, the diameter of the growth inhibition zones around the wells was measured (in millimeters) with a digital caliper with reflected light. The test was performed in triplicate and data were submitted to ANOVA and Tukey’s test (α = 0.05). Both pastes had antimicrobial activity, but Calcipex® was more efficient for most strains. The halo formed in the experiments with S. mutans and S. sanguinis was similar for both pastes. This study suggests that Calcipex® had the highest antimicrobial property with respect to the microorganisms studied.</p>

scholarly journals The Effect of File Size and Type and Irrigation Solutions on the Accuracy of Electronic Apex Locators: An In Vitro Study on Canine Teeth

2016 ◽  
Vol 2016 ◽  
pp. 1-7 ◽  
Author(s):  
Maciej Janeczek ◽  
Piotr Kosior ◽  
Dagmara Piesiak-Pańczyszyn ◽  
Krzysztof Dudek ◽  
Aleksander Chrószcz ◽  
...  
Keyword(s):  
Root Canal ◽  
Therapeutic Process ◽  
In Vitro Study ◽  
Nickel Titanium ◽  
File Size ◽  
Root Canal Preparation ◽  
Apical Constriction ◽  
Working Length ◽  
Termination Point

Measurements of the root canal during endodontic treatment have a significant influence on the course of the therapeutic process as well as on its final result in both human and veterinary medicine. The apical constriction should be the termination point for the preparation and filling of the root canal. This research was conducted with the use of a Septodont kit consisting of a small chamber filled with the examined solution in which a healthy second incisor was placed. The step back method was applied for the root canal preparation and master apical file of 30 was used. The working length was 22 mm. The examination was conducted with the use of steel as well as nickel titanium hand instruments. Different irrigation solutions and two types of apex locators were used. Measurements of the working length of the root canal showed dependence on the size of the instrument. Examinations carried out in various environments showed that analogical measurements were obtained only for sodium hypochlorite solutions. In other environments the measured sections were shortened. Comparative examinations with the use of steel instruments demonstrated insignificant measurement differences. Compared to these results, the measurements in nickel titanium group were characterized by more considerable deviations.

scholarly journals Evaluation of Root Canal Filling in Primary Teeth by Volumetric Analysis: In Vitro Study

2018 ◽  
Vol 11 (5) ◽  
pp. 386-392 ◽  
Author(s):  
Shilpy Singla ◽  
Sadanand Kulkarni ◽  
Prachi Sijeria ◽  
Rahul Bhartia ◽  
Nanjunda Swamy KV
Keyword(s):  
Root Canal ◽  
Primary Teeth ◽  
In Vitro Study ◽  
Volumetric Analysis ◽  
Vitro Study ◽  
Root Canal Filling

scholarly journals Root Surface Temperature Increases during Root Canal Filling In Vitro with Nd:YAG Laser-Softened Gutta-Percha

2020 ◽  
Vol 2020 ◽  
pp. 1-6
Author(s):  
Błażej Podolak ◽  
Alicja Nowicka ◽  
Krzysztof Woźniak ◽  
Liliana Szyszka-Sommerfeld ◽  
Włodzimierz Dura ◽  
...  
Keyword(s):  
Nd:Yag Laser ◽  
Root Canal ◽  
In Vitro Study ◽  
Root Surface ◽  
Yttrium Aluminium Garnet ◽  
Root Canal Filling ◽  
Infrared Thermal Imaging ◽  
Temperature Changes ◽  
Gutta Percha

The aim of this in vitro study was to measure the temperature increases produced on the mesial and vestibular root surfaces of premolar teeth during a laser-softened gutta-percha obturation technique. We studied 12 extracted human premolar teeth with a single canal. After root canal cleaning and shaping, the teeth were obturated with gutta-percha that had been softened with a neodymium-doped yttrium aluminium garnet (Nd:YAG) laser (CTL 1503) at a wavelength of 1.064 nm. The laser setup parameters included a 30 Hz frequency and a 200 mJ/pulse with optical fiber tips of 0.320 mm diameter. A sectional warm gutta-percha condensation was used. Temperature changes on the whole mesial and vestibular outer surfaces of the roots were measured at approximately 2 s intervals with an infrared thermal imaging camera. A significantly higher increase in temperature was observed for the mesial root surface (7.5°C) compared to the vestibular surface (3.7°C) (p≈0). The findings suggested that root canal filling with Nd:YAG laser-softened gutta-percha in premolar teeth is not likely to damage the surrounding periradicular tissues. To obtain valid temperature results, the measurement should be performed on the surface with the thinnest root wall.

Root surface temperature rise of mandibular first molar during root canal filling with high-temperature thermoplasticized Gutta-Percha in the dog

2011 ◽  
Vol 14 (4) ◽  
pp. 591-595 ◽  
Author(s):  
M. Lipski ◽  
K. Woźniak ◽  
D. Lichota ◽  
A. Nowicka
Keyword(s):  
High Temperature ◽  
Surface Temperature ◽  
Temperature Rise ◽  
Root Canal ◽  
In Vitro Study ◽  
Root Surface ◽  
Root Canal Filling ◽  
Gutta Percha ◽  
Mandibular First Molar

Root surface temperature rise of mandibular first molar during root canal filling with high-temperature thermoplasticized Gutta-Percha in the dogThis in vitro study evaluated the temperature rise on the outer root surface of the mandibular first molar following root canal filling using the high-temperature, thermoplasticized, Gutta-Percha technique (HTTG) (BeeFill) in the dog. Twelve extracted dog mandibular first molars were used. After root canal preparation, the teeth were filled with thermoplasticized Gutta-Percha and root canal sealer. Temperature changes on the vestibular surfaces of the mesial and distal roots of mandibular first molars were measured using a thermal imaging camera. The results of this in vitro study showed that using HTTG to fill mandibular first molars in dogs produces a safe temperature rise on the root surface and, therefore, should not damage the periodontal ligament and/or surrounding tissues.

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