Print ISSN: 1812-1217

Online ISSN: 1998-0345

Main Subjects : Prosthodontic Department


Evaluation of the Effect of Physically Magnetized Water on Some Properties of Dental Stone

Ahmed I. Jasim Al-Khyeat

Al-Rafidain Dental Journal, Volume 19, Issue 1, Pages 32-41
DOI: 10.33899/rden.2019.163420

Aims: to study the effect of interaction of dental stone with tap water and physically magnetized water on two periods of time 24h. and 12h to study the change in the physical properties of final product. Materials and Methods: We started prepair no. of control samples and other of samples interacted with physically magnetized water for two periods of time 24h and 12h, then we studied the liner setting expansion and compressive strength.. Results: results obtained from comparing control sample with that treated with physically magnetized water showed an increase in the compressive strength of physically magnetized group and decrease of linear setting expansion in comparison with that of control sample. Conclusion: Reaction of dental stone with physically magnetized water lead to change in some physical properties of dental stone.

Compressive Strength of Type IV Dental Stone With ZnO Nanoparticles

Ali Salah; Ammar Khalid Al-Noori; Marwan Zuhair Elias

Al-Rafidain Dental Journal, Volume 19, Issue 1, Pages 70-79
DOI: 10.33899/rden.2020.126451.1013

ABSTRACT
Aims: To investigate the effect of different concentrations of ZnO nanoparticles on the compressive strength of type IV dental stone. Materials and methods: Total specimens of this research was 66 specimens, it was divided into 3 groups, the first one for wet strength , second group for dry strength and third groups for SEM analysis. 0.2%, 0.5% , 1.0% ,1.5% and 2.0% weight of ZnO incorporated into type IV dental stone then evaluated both wet and dry compressive strength and compare them with the control specimen and investigate it under SEM. The results of the study were analyzed statistically by (Mean ± standard deviation, ANOVA and Duncan’s multiple range test) results were be considered significant at p ≤ 0.05. Results: the compressive strength decreased in comparison to control specimens this drops in strength value is not significant in wet strength while significant in dry strength. SEM image exhibited the morphology of both stone crystals and silver NPs and exhibited the distribution of NPs inside the specimens Conclusions: The study showed that, incorporation of zinc oxide nanoparticles into dental stone reduced the compressive strength property of dental stone and evenly distributed into dental stone.

A New Technique For Splinting Traumatized Anterior Dental or Dento Alveolar Segment . A Clinical Study

Bashar Abdul-Ghani Tafeeq; Rawaa Al-Rawee; Basim M Sultan

Al-Rafidain Dental Journal, Volume 19, Issue 1, Pages 80-89
DOI: 10.33899/rden.2020.126160.1006

A New Technique For Splinting Traumatized Anterior Dental Or Dento alveolar Segment. A Clinical Study
Running Title: Splinting Traumatized Anterior Teeth
Abstract
Back ground: Many different splinting techniques have been described in dental trauma articles. Wire-composite splint, Orthodontic splint, TTS splint, Resin splint, Kevlar/fiberglass splint (fiberglass), Self-etching and bonding material, Suture splint. We describe here a new technique for splinting traumatized teeth and alveolar bone. To evaluate the simplicity and reliability of cold-cured acrylic resin immediate splinting in the management of traumatized anterior teeth.
Results: A total number of (46) patients with traumatized dental or dento-alveolar segment due to accident or operation were managed with immediate cold-cured acrylic resin splint without the need for anesthesia for fixation, the study carried out from January (2008–2014). Forty four dento-alveolar trauma patients, 2 patients following upper dento-alveolar osteotomy, 2 splints dropped down (2) days post-splinting, the splints removed (14-21) days.
Conclusion: this new technique in the management of dento-alveolar trauma is a reliable, simple, easy, less technical, painless and less time consuming procedure.

Water sorption and solubility of two acrylic resin denture base materials polymerized by Infrared radiation

Aliaa W Alomari; Nagham H Kassab; Nada Z Mohammed

Al-Rafidain Dental Journal, Volume 19, Issue 1, Pages 20-31
DOI: 10.33899/rden.2019.126003.1003

Aims: To determine the effect of different curing times of a new method of polymerization by infrared radiation on the absorption and solubility in water of acrylic resin materials for denture base. Materials and Methods: In this study two types of denture base materials cured by heat were used (Traditional or Conventional and High Impact), the entire number of prepared specimens were (80) which grouped into: A- Control group: Consisted of two types of acrylic resin specimens polymerized by conventional water bath .B- Experimental group: Consisted of two types acrylic resin specimens polymerized by infrared radiation (IR) at different times of curing cycles. In each group; specimens were divided equally, some related to water sorption test others for solubility test. The mean of mass change of the material after they saturated with water and dried out of it was used, then analysis of data was done using one-way analysis of variance and Duncan test. Results: Statistically, no significant differences existed between Traditional and High Impact acrylic resin cured by water bath in water sorption and solubility tests. The means values for previously mentioned tests in two types of acrylic resin had been decreased significantly by changing type of curing from conventional water bath to (IR) method. Conclusions: The selection of appropriate time and type of curing method may optimize the level of absorption and solubility in water for previously mentioned materials.

Compressive Strength of Type IV Dental Stone With Ag Nanoparticles

Ali Salah; Ammar Khalid Alnori; Marwan Zuhair Elias

Al-Rafidain Dental Journal, Volume 19, Issue 1, Pages 60-69
DOI: 10.33899/rden.2020.126450.1012

ABSTRACT
Aims: To investigate the effect of different concentrations of Ag nanoparticles on the compressive strength of type IV dental stone. Materials and methods: Total specimens of this research was 66 specimens, it was divided into 3 groups, the first one for wet strength , second group for dry strength and third groups for SEM analysis. 0.2%, 0.5% ,1.0% ,1.5% and 2.0% weight of Ag NPs incorporated into type IV dental stone then evaluated both wet and dry compressive strength and compare them with the control specimen and investigate it under SEM. The results are analyzed statistically by (Mean ± standard deviation, ANOVA and Duncan’s multiple range test) it is considered significant at p ≤ 0.05. Results: the compressive strength decrease in comparison to control specimens this drops in strength value is not significant in wet strength while significant in dry strength. SEM image exhibited the morphology of both stone crystals and silver NPs and exhibited the distribution of NPs inside the specimens. Conclusions: The study showed that, incorporation of silver nanoparticles into dental stone reduced the compressive strength property of dental stone and evenly distributed into dental stone.

Prosthetic Treatment for Hemimaxillectomy Patient: (A Clinical Case)

Nashwah Subhi; Mohammed A Abdulla; Nadira A Hatim

Al-Rafidain Dental Journal, Volume 18, Issue 1, Pages 67-72
DOI: 10.33899/rden.2019.161241

Aims: prosthetic rehabilitation of a maxillary defect after hemi-maxillectomy with a palatal obturator made from nickel chromium framework. Materials and methods: A silicon impression was made and poured with a dental stone to develop a definitive cast. The site, position and shape of maxillary defect determine the path of insertion. Design the metal framework of the obturator to Class II R.P.D according to Kennedy's classification. Casting the framework in base-metal alloy made from nickel chromium framework, centric jaw relation was recorded. A finished prosthesis (an obturator of closed hollow-bulb type) was inserted. Conclusions: Obturator prosthesis enhancing function and speech, reduce the rate of fluids and food passing to the nose. Extend the border of an acrylic of the prosthesis at defect site lead to enhance both the retention and stability of the obturator.

Water sorption of light–cured composites

Ammar Kh Al–Nori

Al-Rafidain Dental Journal, Volume 5, Issue 1, Pages 1-5
DOI: 10.33899/rden.2004.45503

The aim of the present research was to study the percentage
water sorption and solubility of Esthet composite
resin based on an ethoxylated bisphenol A glycol dimethacrylate
(Bis–EMA) and Heliomolar composite resin based
on bisphenol A glycol dimethacrylate (Bis–GMA). Six specimens
were prepared for each material using aluminum disc 15
mm in diameter and 1 mm in thickness between two glass
slides; then they were light cured for 80 seconds on each side.
Percentage water sorption and solubility were measured after
one week and one month. The results showed that water sorption
after 1 week for Esthet composite and Heliomolar composite
were 0.433 and 1.12, respectively and solubility were
0.074 and 1.066, respectively; while water sorption after 1
month were 0.517 and 2.57, respectively and solubility were
0.176 and 2.689, respectively.
It could be concluded that the percentage sorption and
solubility of composite based on Bis–EMA were significantly
lower than that based on Bis–GMA.