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   Table of Contents - Current issue
July-September 2019
Volume 16 | Issue 3
Page Nos. 121-168

Online since Tuesday, January 14, 2020

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Uses, accuracy and limitations of semiadjustable articulators in dentistry: a systematic review p. 121
Writuraj Sutradhar, Sunil K. Mishra, Ramesh Chowdhary
Purpose: The article reviewed the various studies on semiadjustable articulators (SAA) to determine their uses, accuracy and limitations in orienting the cast. Materials and methods: An electronic and manual search of PubMed and Medline databases and other published articles was performed. The article concomitant to question in focus on accuracy of cast orientation on to the SAA with the help of facebow when compared to the lateral cephalogram was included. Other question in focus was whether interocclusal records used for programming the articulator are more accurate than the computerized jaw-tracking devices. Article on reliability, repeatability and interchangeability of SAA were also included. The study also focused on the use of SAA in various specialties of dentistry with the help of available literatures. Only articles in English were considered for the study. Results: The initial search resulted in 450 papers. The reviewers independently screened the abstracts for those articles related to the focus question. Of the resulted 72 studies, 16 were excluded for not being in English, resulting in 56 entries. Hand-searching yielded 2 additional papers. Conclusion: SAA seems reliable in interchangeability and promising to be used in various fields of dentistry. The condylar guidance obtained by SAA proves to be more accurate than other radiographic methods. Jaw motion analyzer is more accurate in adjusting the SAA rather than protrusive records.
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Enhanced bioactivity and interfacial marginal adaptation of mineral trioxide aggregate and Biodentine materials modified by eggshell powder at root dentine p. 136
Khaled A. Beshr, Ramy A. Abdelrahim
Objectives: Mineral trioxide aggregate (MTA) as silicate-based cement material may provide better bioactivity than Biodentine material which used as a replacement to MTA in dental practice in different endodontic uses. Also the modifying MTA and Biodentine by adding eggshell powder (ESP) may improve their bioactivity and promote the formation of a reliable sealing through formation a thick and continuous interfacial layer at root dentine/material interface. Aim: This study was aimed to investigate marginal adaptability, the presence or absence of interfacial layer, and enhanced bioactivity's of MTA and Biodentine modified by addition of ESP, at the root dentine/material interface. Materials and methods: Thirteen root dentine segments of about 2 mm thickness were obtained from extracted human teeth and mechanically prepared by endodontic files to enlarge their canals. The specimens were then divided into six groups (n=5), each group were filled with unmodified MTA and Biodentine and modified with 0.5 and 1% ESP. The specimens were immersed in Hank's Balanced Salt Solution simulating body fluid for 30 days. The specimens were then, examined by scanning electron microscopy and energy disperse x-ray spectroscopy (EDX) to examine the presence or absence of interfacial layer and Ca/P ratio. Results: The interfacial layer can be seen in MTA and Biodentine groups that modified with 1% ESP. Also, MTA showed better marginal adaptability than Biodentine groups. There was a statistically significant difference in the Ca/P ratio among the all investigated groups. Conclusion: Addition of ESP to MTA and Biodentine can improve the mineral deposition at root dentine/material interface and also improve their sealing ability through the formation of interfacial layer.
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Micro-marsupialization as a conservative therapeutic approach for management of pediatric oral mucoceles p. 142
Emad F. Essa, Talat M. Beltagy, Yasser M. El Mekaky
Background: Alteration of minor salivary glands due to a mucous accumulation is known as mucocele. It is considered to be a common oral mucosa lesion in pediatric and adolescents. The invasive conventional surgical technique, including surgical excision of the mucocele with the affected minor salivary gland, is not preferred especially in large lesion and in pediatric patients. Objective: This research aims to study the efficacy of micro-marsupialization as a new conservative technique for management of oral mucoceles in pediatric patients. Patients and methods: A prospective study was carried out using the clinical records of patients under 12 years old. The patient's age was ranged between 6 and 12 years old with a mean of 9.83 years. Twelve patients were included; they were suffering from mucocele and were treated using conservative micro-marsupialization as a solo treatment via draining the mucus out of the mucoceles to reduce its size and allowing subsequent healing. All children were recalled for clinical evaluation after 1 week, 1, and 3 months. Patients and methods: Out of the 12 children, seven (58.3%) children were complaining of lower lip mucoceles with 100% success, while the other five (41.7%) children were complaining of oral ranula, the micro-marsupialization technique showed 80% of successful results plus one recurrent case after 1 month of the technique that was treated by conventional marsupialization with packing. Results: Micro-marsupialization has proved to be a simple technique, the best choice management for pediatric mucoceles. It is rapid to perform, noninvasive, painless, requires only surface anesthesia, effective, low recurrence, well-tolerated by children, and can be easily performed by dental general practitioner in daycare outpatient departments safely.
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Reinforcing experimental resin-composites with synthesized zirconia and alumina nanofibers: evaluation of cuspal flexure, flexural strength, flexural modulus and fracture toughness p. 149
AbdAllah F. El-Saadany, Samy M. El-Safty, Usama M. Abdel Karim, El-Refaie S. Kenawy
Aim: This study evaluated cuspal flexure, flexural strength, flexural modulus and fracture toughness of experimental resin-composites reinforced with zirconia and alumina nanofibers. Zirconia and alumina nanofibers were synthesized by wet electrospinning technique. Characterization of these nanofibers was carried out by scanning electron microscopy, X-ray diffraction and Fourier transform infrared spectroscopy that confirmed pure forms of zirconia nanofibers (50–100 nm in diameter) and alumina nanofibers (70–100 nm in diameter). Materials and methods: The study was divided into seven groups (n = 10/group) according to the type and percentage of added nanofibers: control group, three groups reinforced with 2, 4 and 6 wt% zirconia nanofibers and more three groups reinforced with 2, 4 and 6 wt% alumina nanofibers. Results: A one-way analysis of variance revealed significant differences between the studied groups (P = 0.000) for all investigated properties. Mean cuspal flexure ranged between 0.13 and 0.36% with markedly lower values for groups with higher percentages of nanofibers. For flexural strength, data ranged between 98 and 168 MPa, for flexural modulus between 7.6 and 17.04 GPa, and for fracture toughness between 1.16 and 3.51 MPa m1/2 with greater values recorded for nanofibers-reinforced groups. Conclusion: Zirconia nanofibers were superior to alumina nanofibers in reducing cuspal flexure and improving the studied mechanical properties.
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Effect of two tissue inhibitors on the antimicrobial activity of chitosan nanoparticles and chlorhexidine p. 163
Muhammad S. Anwar, Abeer M. Darrag, Lamiaa A. Al-Madboly, Walaa M. Ghoneima
Aim: To assess the effect of dentin powder (DB) and human serum albumin (HSA) as tissue inhibitors on the antibacterial activity of chitosan nanoparticles (CSnps) and chlorhexidine (CHX). Materials and methods: The antibacterial effect of CSnps and CHX in presence or absence of inhibitors was tested on planktonic Enterococcus faecalis OG1RF standard strain. Study groups were group 1: DB and CSnps, group 2: DB and CHX, group 3: HSA and CSnps, and group 4: HSA and CHX, group 5: CSnps suspension (positive control for groups 1, 3), group 6: CHX solution (positive control for groups 2, 4), and bacteria suspension as a negative control (group 7). The assigned medications were added to tissue inhibitors for an hour before bacterial suspension addition. After 1 min, 24, and 72 h of bacterial suspension addition a sample was taken. Bacterial culturing was done on brain heart infusion plates at 37°C. The plates were incubated for 24 h and were inspected for growth by naked eye and the colonies the number of surviving bacteria was calculated. Data were collected and the mean and SD of log10 colony forming units was calculated and statistically analyzed using one-way analysis of variance and pairwise comparison between groups was performed whenever significant difference was found. Level of significance was set at P value less than or equal to 0.05. Results: Group 3and group 7 were statistically significant than all tested groups at all times. Also, significant difference between group 4 versus group 2 and group 6 recording P value of 0.048 at 1 min. However, there was no significant difference between groups 1, 2, 4, 5, 6 at 24 and 72 h. Conclusions: HSA had significant inhibitory effect on antibacterial activity of CHX and CSnps than DB at 1 min. At 24 and 72 h, neither HSA nor DB had significant inhibitory effect on antibacterial activity of CHX while HSA had a significant effect on antibacterial activity of CSnps.
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