Table of content

Journal of Oral and Dental Research

مجلة طب الفم والاسنان

ISSN: 23106417
Publisher: Iraqi Association for Oral Research
Faculty:
Language: English

This journal is Open Access

About

The Journal of Oral and Dental Research (JODR) is an international peer‐reviewed scientific journal. The aim of the JODR is to publish high standard original papers related to dental, oral and craniofacial structures in health and disease. Basic research, clinical case studies and reviews will be considered for publication. The journal will be published biannually online. The JODR is the official journal for the Iraqi Association for Oral Research, the Iraqi Division of the International Association for Dental Research.
The publication will be on a rolling basis, with manuscripts being published on the site as soon as they make it through the peer-review process. This increases the exposure of the articles and keeps the JODR current. Manuscripts are now being accepted and submissions are welcome from authors from around the world, for basic research, case reports and literature reviews.

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Table of content: 2019 volume:6 issue:1

Article
A Comprehensive Survey on Orthodontic Retention Protocols Among Iraqi Orthodontists

Authors: Hayder J. Attar
Pages: 1-6
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Abstract

Background Little research has been conducted to evaluate protocols and trends in orthodontic retention. The objective is to identify the general retention protocols used among orthodontists in the Iraq. Materials and methods the study was conducted via an electronic survey (Survey Monkey® software facility) with branching logic on certain questions. The survey questionnaire was sent to 172 orthodontist members of the Iraqi Association of Orthodontists. Results Vacuum formed retainers were the most frequently used retainer type for the maxillary (61%) and mandibular arch (60%); followed by Hawley retainers (34%) in the maxillary and (30%) in mandibular arch; while fixed retainer was much less frequently used in maxillary arch(9%) and in the mandibular arch(19%). the orthodontists recommended an average of 22 hours a day (SD = 1.5) for retainers should be worn During the retention phase (duration average 9.2 months). The orthodontist responses revealed the patient compliance to the vacuum formed retainers about (43%) and (46%) for the maxillary and mandibular arch respectively; and for the Hawley retainers about (25%) and (40%) in maxillary and mandibular arch respectively, for the fixed retainers was reported as (25%) in the maxillary arch and (7%) in mandibular arch, (77%) of patient compliance to their retention protocol at the first six month after debonding that decrease to (46%) and (9.8%) after one and three years following active treatment respectively. Conclusion Vacuum Formed Retainers were the most common retainer choice in the maxilla and mandible with full-time wear which the orthodontist believed the more patient compliance followed by Hawley retainers then fixed retention.


Article
Push Out Bond Strength of GuttaFlow 2, Thermafil and Guttacore (An Invitro Study)

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Abstract

Background Several root canal filling materials and techniques have been developed and studied, aiming to completely fill the root canals, their ramifications, and any anatomical variations, which are frequently observed. The objective is to investigate the push out bond strength of three different obturation materials GuttaFlow 2, Thermafil and GuttaCore at different levels. Materials and methods thirty extracted upper molars were collected and the palatal roots were sectioned at the CEJ of the tooth. The platal roots were instrumented with Hyflex CM rotary files to the size of 40/0.06. The instrumented samples were divided into three groups of ten samples each, the first group was obturated with GuttaFlow 2, the second group was obturated with Thermafil and the third group was obturated with GuttaCore obturating materials. After an incubation period of 7 days, each sample were sectioned into three sections of 2 mm thickness (apical, middle, coronal), each slice then introduced to the push out testing using a universal testing machine at a cross head speed of 0.5 mm/min. Results it showed Push-out bond strengths were significantly higher when canals were filled with GuttaCore than those filled with Thermafil and GuttaFlow 2. And Thermafil showed a higher significant difference than the GuttaFlow 2. It also showed that the bond strength values decreased from the coronal to the apical direction. Conclusion The thermoplasticized gutta-percha appears to achieve higher push out bond strength values than the cold flowable gutta-percha. With GuttaCore showed higher push out bond values than Thermafil.


Article
Preparation and pH with Antibacterial Evaluation of Nano Calcium Oxide Based Intracanal Medicament from Natural Products (An In vivo Study)

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Abstract

Background To prepare new calcium based intracanal medicament from egg shell and sea shell powder mixed with pure coconut oil then evaluate the antibacterial activity of the new prepared materials and compare the result with Metapex intracanal medicament. Materials and Methods Calcium based intracanal medicament have been prepared from local egg shell and from seashell (Cowrie) in a form of nano calcium oxide powder; each powder was mixed separately with locally made pure coconut oil to form two experimental materials. Antimicrobial activity was evaluated by direct contact inhibition zone test of each experimental material and control with Enterococcus faecalis, after 24 hours of incubation at 37◦C, zone of bacterial growth was observed and measured. Results The results showed that both of the prepared materials have antibacterial effect, these results were statistically analyzed using One-way ANOVA & Duncan›s Multiple Range test at p=0.01 levels. Conclusion Results have shown that both egg and sea shells contain many types of metal oxides in different concentration that might have antibacterial action in addition to the lauric acid from the coconut oil which clinically proven to have antibacterial activity that aided the experimental materials to have an acceptable antibacterial activity.


Article
Fracture Toughness of Two Types of All-ceramic Restoration after Repeated Firing

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Abstract

Background The ability to measure and describe changes in the mechanical properties of ceramics due to various thermal handling protocols will provide a better understanding of the mechanical performance and application of dental ceramic materials. Objectives To evaluate and compare the fracture toughness of two types of all-ceramic restoration (Zirconia and IPS e. max (Lithium disilicate) CAD) after repeated firing. Materials and Methods Sixty all ceramic samples (in final dimensions of 18 mm Length, 4 mm Width, and 3 mm Thickness) were prepared and divided into two main groups according to the used materials; Group (Z) for Zirconia and Group (E) for IPS e. max CAD. Each main group subdivided into three subgroups according to firing cycles. The (Z) group subdivided into ZF3, ZF5 and ZF7; And group (E ) also subdivided into EF3, EF5 and EF7 for three, five and seven firing cycles respectively. Then, the samples were subjected to the indentation strength using a Micro-Vickers Hardness Tester device. After completing of the firing process, the samples were subjected to the fracture toughness test for each specimen. Scanning electron microscope (SEM) images were taken for one random specimen for each subgroup. Results The data showed the highest fracture toughness were obtained with EF5 and the lowest fracture toughness with ZF7 and the P-value of (P≤ 0.05). LSD test done and revealed a highly significant difference between the groups. Conclusion generally, E. Max. CAD material may verify best results of fracture toughness test compared with Zirconia material after repeated firing cycles.


Article
The effect of aging on tensile strength of two maxillofacial silicone materials before and after pigmentation

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Abstract

Background The approximate life span of a silicone maxillofacial prosthesis is as short as after 4-14 months of usage, then a new prosthesis should be fabricated. But now many researchers have been directed toward improvement of properties silicone elastomeric materials. The objective of this study is to evaluate the effect of aging on tensile strength of two types of silicone materials used in the maxillofacial prostheses (VST-30 and VST-06) after artificial weathering for 100, 200 and 300 hours, and then comparing between the two selected materials in terms of selected artificial weathering periods. Material and methods a sample of 160 specimens were prepared and divided into two main groups according to the types of elastomeric silicone (VST-30 and VST-06). Then each group subdivided into 8 divisions, (n=10). Two groups, one for clear and one pigmented as control groups before experimental weathering .While the experimental groups divided into clear and pigmented groups treated with artificial weathering for 100, 200 and 300 h. Results after different weathering cycles the results show that there was no significant difference in the tensile strength for VST-30 silicone material pigment before and after weathering. While there was a highly significant difference in the tensile strength for VST-06 pigmented silicone before and after weathering. Both VST-30 and VST-06 non-pigmented groups showed a highly significant change in the tensile strength after different weathering cycles. Conclusions the superior type for mechanical properties after difference cycles weathering was for VST-30 and incorporation of rayon flocking prevents the silicone materials from rapid degradation under artificial weathering and this may lead to increase in the service life of silicone prosthesis.

Keywords

Background The approximate life span of a silicone maxillofacial prosthesis is as short as after 4-14 months of usage --- then a new prosthesis should be fabricated. But now many researchers have been directed toward improvement of properties silicone elastomeric materials. The objective of this study is to evaluate the effect of aging on tensile strength of two types of silicone materials used in the maxillofacial prostheses (VST-30 and VST-06) after artificial weathering for 100 --- 200 and 300 hours --- and then comparing between the two selected materials in terms of selected artificial weathering periods. Material and methods a sample of 160 specimens were prepared and divided into two main groups according to the types of elastomeric silicone (VST-30 and VST-06). Then each group subdivided into 8 divisions --- (n=10). Two groups --- one for clear and one pigmented as control groups before experimental weathering .While the experimental groups divided into clear and pigmented groups treated with artificial weathering for 100 --- 200 and 300 h. Results after different weathering cycles the results show that there was no significant difference in the tensile strength for VST-30 silicone material pigment before and after weathering. While there was a highly significant difference in the tensile strength for VST-06 pigmented silicone before and after weathering. Both VST-30 and VST-06 non-pigmented groups showed a highly significant change in the tensile strength after different weathering cycles. Conclusions the superior type for mechanical properties after difference cycles weathering was for VST-30 and incorporation of rayon flocking prevents the silicone materials from rapid degradation under artificial weathering and this may lead to increase in the service life of silicone prosthesis.

Table of content: volume:6 issue:1