Online ISSN: 2515-8260

Author : Aggarwal, Renu Aggarwal, Rajnish Aggarwal, Anisha

Evaluation of Canal Transportation and Centering Ability of Three Single File Systems

Renu Aggarwal, Rajnish Aggarwal, Anisha Aggarwal

European Journal of Molecular & Clinical Medicine, 2022, Volume 9, Issue 3, Pages 5256-5262

Introduction: The canal transportation is defined as as removing the structure of canal
wall on the outer curve in the apical half of the canal due to the fact that the rotary files
being used failed to restore themselves to their original linear shape during canal
shaping. The success of an endodontic treatment is determined majorly by the effective
biomechanical preparation and following the original anatomy of the root canal.
Materials and Methodology: For the study purpose, eighty mesio-buccal root canals
from human permanent mandibular first molars teeth which were extracted for various
periodontal reasons, caries free and non-carious lesion free accompanied by normal
anatomical form and structure were carefully selected. At once, the root canals were
prepared, CBCT series of images were taken for all the teeth. Both mesiodistal and
buccolingual diameters were recorded at 2mm, 3mm and 4 mm from the apex in both
the diagnostic and postoperative CBCT imaging.
Results: The Reciproc (Group I) system revealed the greatest canal transportation with
least centering ability when compared to other file systems that have been studied. The
observable difference in the canal transportation in the 3 groups was reported to be
statistically significant (p<0.001), except while comparing the 4 mm distance from the
root apex, the buccolingual transportation was not statistically significant between the
Reciproc and WaveOne groups (p = 0.591). In, OneShape rotary file system has
recorded the highest centering ability, while the Reciproc displayed the lowest under
certain experimental conditions.

Analysis of Sealing Ability of Two Retrograde Filling Materials Using Dye Penetration Method: An Institutional Based Study

Renu Aggarwal, Rajnish Aggarwal, Anisha Aggarwal

European Journal of Molecular & Clinical Medicine, 2022, Volume 9, Issue 3, Pages 5238-5243

Introduction: The primary objective of any root end filling material is to seal the apical
region to avoid any kinds of bacterial infiltration or their by-products from the
supporting periodontal structures into the root canal system.
Materials and Methodology: For the study purpose, sixty mandibular premolars were
selected which were extracted for orthodontic reasons. The root surfaces were sought to
be cleaned and the soft tissue remnants present as debris were removed help of
Ultrasonic scaler and teeth were stored in distilled water until further use. The
materials that were intended to be studied in this research were manipulated as per the
manufacturer’s instructions and the cavities were filled respectively. The specimens
were then coated with 2 coats of nail varnish except at the 1 mm apical area & then they
were allowed to be dried.
Results: Group A: Since it is a control group, no material was placed. All
stereomicroscopic images for the control group demonstrated a relative amount of dye
penetration. Both Group B and C showed microleakage, where Giomer and Biodentine
showed microleakage but the difference was not statistically significant. Biodentine is
considered as better root-end materials since it showed lesser microleakage than
Conclusion: Both the root-end filling materials such as Giomer and Biodentine revealed
the presence of microleakage but the results were not observed to be statistically
significant. Comparatively Biodentine possessed lesser microleakage than Giomer and it
is considered to be better. Therefore, it can be effectively used as a retrograde filling
material with better results.

Comparative Analysis of Effect of Liners on Shear Bond Strength of Veneered Zirconia Block: An Institutional Based Study

Renu Aggarwal, Rajnish Aggarwal, Anisha Aggarwal

European Journal of Molecular & Clinical Medicine, 2022, Volume 9, Issue 3, Pages 5232-5237

Introduction: All ceramic restorations which are comprised of porcelain veneer on a
zirconia substructure are gaining more interest since it almost replaced all the metal
ceramic restorations. The evaluation of bond strength of layered porcelain over zirconia
substructure could be just subjected to shear bond strength test, three & four points
flexure, tensile and micro-tensile bond test.
Materials and Methods: The study was designed as an in-vitro study which was
conducted in Surendera Dental College & Research Institute, Sri Ganganagar,
Rajasthan, India. The number of study samples were set at 80 which are fabricated
from VITA zirconia discs. Samples were divided into 4 groups. Each group having 20
samples. All the 80 samples were loaded under a standard shear load at a crosshead
speed of 0.5 mm/min and load was noted using universal testing machine (Asian
Universal Testing Machine, LRX 2K5, Hants, UK). Sample was taken for further
evaluation of the fracture mode. SEM study was done at 49 X, 350 X and 1000 X.
Statistical analysis was performed.
Results: Group I is control group, group II is lithium disilicate glass–ceramic liner
group, group III is silicon dioxide-based liner, and group IV is glass–ceramic interlayer
group. Mean shear bond strength in group I was 22.5 MPa, in group II was 62.2 MPA,
in group III was 63.4 MPa and in group IV was 34.9 MPa. The difference was
significant (P< 0.01).
Conclusion: SBS was reported maximum after the application of lithium disilicate
glass–ceramic liner at 930°C followed by glass–ceramic interlayer at the same sintering
temperature which is 930°C and silicon dioxide-based liner at 930°C. The fractographic
behaviour analyses that zirconia samples lined with lithium disilicate glass–ceramic
liner presented with adhesive failures (failure between glass–ceramic liner) whereas the
use of silicon dioxide-based liner showed cohesive failures (failure within veneering
porcelain) while the control group revealed with both cohesive and combined failures.

Evaluating the Influence of Irrigants on Coronal Microleakage of Various Adhesive Restorative Materials Using Polymicrobial Marker: A Prospective Study

Renu Aggarwal, Rajnish Aggarwal, Anisha Aggarwal

European Journal of Molecular & Clinical Medicine, 2022, Volume 9, Issue 3, Pages 5244-5249

Introduction: Failure in achieving the coronal marginal integrity could possibly
questions the prognosis of the endodontically treated teeth. The success and the aim of
an endodontic therapy tends to reduce infection in the root canal system and to
eliminate reinfection from the apical and coronal region.
Materials and Methodology: A total of 80 freshly extracted, intact human mandibular
premolars were selected and being used for this study. 40 samples were irrigated with 2
mL of 3% sodium hypochlorite and 17% EDTA, finally rinsed with saline. For another
40 samples irrigation regimen was 2 ml of 3% sodium hypochlorite and tublicid plus,
finally rinsed with saline. Coronal section of 4 mm length was used in this study which
was further obtained by sectioning tooth horizontally with diamond disk. All the
samples were prepared so that they have a through and through channel and were
coated superficially with three layers of nail varnish and were then autoclaved. Each
group comprising of 40 samples were again sub grouped into two such that each has 20
teeth (n=20) and restored with nanocomposite and nano glass ionomer cement based on
the manufacturer protocols.
Results: Sample was irrigated with EDTA and further restored with nanocomposite
demonstrated maximum leakage with mean number of days at which leakage occurred
was 55.82 and least microleakage was seen with samples that were irrigated with
tublicid plus and restored with nanocomposite with mean number of days at which
leakage observed was at 71.32.
Conclusion: To conclude that no material could possibly replace lost tooth structure.
Either the irrigants or the restorative materials may not effectively prevent
microleakage. Therefore, from this study, definitive treatment like crown placement
should be done without any delay in order to achieve a good prognosis of the endodontic
treatment. Failing to do so could result in a fatal prognosis and outcome of the
endodontically treated teeth.

Assessment of Post-Operative Pain with Different Calcium Hydroxide Formulations Used as Intracanal Medicament in RCT

Renu Aggarwal, Rajnish Aggarwal, Anisha Aggarwal

European Journal of Molecular & Clinical Medicine, 2022, Volume 9, Issue 3, Pages 5250-5255

Introduction: Effective eliminating the microorganisms from the root canal system is
the utmost objective which determines the intensity of the post-operative pain and
swelling. So, the aim of this study is that to evaluate the efficacy of water-based calcium
hydroxide, iodoform based calcium hydroxide, calcium hydroxide with chitosan as
vehicle and calcium hydroxide points as an intracanal medicament in reducing the postoperative
pain and swelling.
Materials and Methodology: This prospective study included two hundred patients
requiring root canal treatment on maxillary or mandibular anteriors, mandibular first
and second premolars were comprised totally. After clinical examination and
radiographic examination, patients were randomly assigned to five groups. Each group
had sample size (n= 40) depending upon intracanal medicament used as follows: Group
1: Calcium hydroxide paste (Ivoclar) Group 2: Calcium hydroxide paste with iodoform
(Metapex) Group 3: Calcium hydroxide points (Hygienic) Group 4: Calcium hydroxide
paste using chitosan (0.2%) as vehicle and Group 5: Control group containing dry
sterile cotton. The tooth that requires root canal treatment were anesthetised using
1.8ml, 2% lignocaine with 1:100,000 epinephrine.
Results: The present study results show that the application of calcium hydroxide with
propylene glycol based paste (Group 1) in root canal greatly reduces the post operative
pain after 12, 24 and 48 hour post-operative which is better in comparison to other
groups. The post operative pain was recorded least with (Group 3) calcium hydroxide
points and maximum in (Group 5) control group at 6 hour post-operatively. When
observed after 12 hours, the post-operative pain was recorded minimum with Group1
followed by Group 3 and maximum in Group 5 that is the control group.