7 research outputs found
Micro-computed tomographic evaluation of dentinal defects after root canal preparation with hyflex edm and vortex blue rotary systems
To evaluate the incidence of dentinal microcracks formation after root canal shaping procedures with HyFlex EDM and Vortex Blue rotary systems comparing with that of hand instrumentation using micro-computed tomography. Mandibular first molar teeth (n=60) having 50 to 200mesial root curvature were scanned using high resolution micro-CT imaging before root canal preparation to identify the presence of dentinal defects. Post-instrumentation cross-sectional images were taken and increased number and type of root defects were assessed and recorded. The data was statistically analysed by using chi-square test and McNemar?s test at a significance level of 5%. HyFlex EDM has shown greater increase in post instrumentation dentinal defects. Both rotary systems exhibited increased dentinal defects formation at coronal, middle regions which is statistically significant (P=0.042) when compared to apical region. HyFlex EDM has shown greater increase in post instrumentation dentinal defects followed by Vortex Blue rotary system and hand instrumentation resulted minimal defects
Autotransplantation of Mandibular Third Molar: A Case Report
Autogenous transplantation is a feasible, fast, and economical option for the treatment of nonsalvageable teeth when a suitable donor tooth is available. This paper presents successful autotransplantation of a mature mandibular left third molar (38) without anatomical variances is used to replace a mandibular left second molar (37). The mandibular second molar was nonrestorable due to extensive root caries and resorption of distal root. After extraction of mandibular second and third molars, root canal therapy was done for the third molar extraorally, and the tooth was reimplanted into the extracted socket of second molar site. After one year, clinical and radiographic examination revealed satisfactory outcome with no signs or symptoms suggestive of pathology. In selected cases, autogenous tooth transplantation, even after complete root formation of the donor tooth, may be considered as a practical treatment alternative to conventional prosthetic rehabilitation or implant treatment
Evaluation of Marginal Adaptation and Wear Resistance of Nanohybrid and Alkasite Restorative Resins
Introduction: Polymerisation shrinkage stresses developed
during curing of adhesive resin cements may cause debonding
at the margins of cavity leading to microgap formation with
secondary caries and consequently restorative failure. Thus,
a restoration should have good marginal integrity and wear
resistance to obtain high success with clinical longevity.
Aim: To compare the influence of thermo-mechanical stresses
on marginal quality and wear of class II Mesio-Occluso-Distal
(MOD) restorations filled with Solare Sculpt or Cention N.
Materials and Methods: An in vitro study was conducted at
GITAM Dental College and Hospital, Visakhapatnam on 80
human extracted mandibular molars by preparing mesioocclusal-distal class two cavities that restored either with Solare
Sculpt or Cention N resin composites. Baseline evaluations were
recorded for marginal gaps (in µm) through Scanning Electron
Microscope (SEM), and the weights of the samples were
recorded by an electronic balancing instrument to measure the
amount of wear (in grams). Following thermo-mechanical cyclic
loading, all the restored teeth were evaluated again to record
the same parameters. The statistical analysis was done using
Statistical Package for the Social Sciences (SPSS) programme for
windows version 22.0 (IBM, NY) software. An independent t-test
for intergroup comparison and a dependent t-test for intragroup
comparisons were done to analyse the tested parameters with
the significance level established at (p≤0.05).
Results: In intergroup comparison, no difference in marginal
adaptation was observed before thermo-mechanical loading
between two materials with a p-value of 0.3625, but after thermomechanical loading Cention N exhibited significantly superior
marginal adaptation with a p-value of 0.0374. Both the materials
have shown a significant difference in the marginal adaptation
after thermo-mechanical loading in the intragroup comparison
with Cention N (0.0002) and Solare sculpt (0.0001) p-values. The
wear rate was not different statistically between the materials
with a p-value of 0.7144 before thermo-mechanical loading and
0.2285 after thermo-mechanical loading.
Conclusion: Marginal adaptation of Cention N was superior to
Solare Sculpt, whereas both the materials exhibited a similar
wear rate