2024-03-29T06:04:10Z
https://jdmt.mums.ac.ir/?_action=export&rf=summon&issue=1143
Journal of Dental Materials and Techniques
JDMT
2322-4150
2322-4150
2017
6
1
Comparative Analysis of Dimensional Accuracy of Two Types of Silicone Impression Materials: Optosil and Elite-HD
Amini
Parviz
Amin
Rahpeyma
Maryam
Hejazi
Statement of the Problem: Understanding about impression materials, their properties, uses and manipulation can guide operators towards having more successful restorations. Purpose: The aim of this in vitro study was to compare the accuracy of a condensation silicone impression material, Optosil, and an addition poly siloxane impression material, Elite-HD. Materials and Method: A laboratory model with two metallic dies was used to make impression. A horizontal notch on one of the two dies simulated an undercut. Ten impressions were made by each impression material by the putty-wash technique. After pouring impressions with velmix die stone, a total of 20 stone casts were made from both materials. Measurements of casts were compared with the master model. Statistical analyses were performed using t-test. Result: This results of this study showed that the height of die without undercut decreased in both groups. Also the height above the undercut decreased in both groups, which was more obvious in Elite-HD group than Optosil group. The distance between dies increased in both groups, with higher figures for Elite-HD. So, Optosil is a more accurate material for registering inter-abutment distance than Elite-HD. The diameter of die under the undercut decreased in Optosil group and was similar to the master model in Elite-HD. Statistical analysis showed significant differences between these two groups in the distance between abutments (p=0.001), the diameter of die under the undercut (p=0.014) and the height of die above undercut(p=0.057). Conclusion: Optosil is more accurate in registering inter-abutment distance than Elite-HD, so Optosil is preferred for fixed partial denture impressions. Since Elite-HD showed more accuracy in C measurements than Optosil, it is preferred for single crown impressions.
Dimensional Measurement Accuracy
Elastomeric Impression Materials
Polyvinyl Siloxane
Dimensional changes
2017
03
01
1
6
https://jdmt.mums.ac.ir/article_7946_0c9b8df0a8bc2aa47046b2f398a962cb.pdf
Journal of Dental Materials and Techniques
JDMT
2322-4150
2322-4150
2017
6
1
Evaluation of Pound concept in determination of mediolateral mandibular posterior teeth position
Majid
Naser Khaki
Maryam
Mohajerfar
Masood
Ejlalai
Sara
Tvakolizadeh
Background: The ideal teeth arrangement is an important step for success in complete denture fabrication. There are different methods for determining the posterior denture teeth location. The purpose of this study was the comparison of posterior mandibular teeth location in the study group with Pound or Misch theory. Material and methods: An alginate mandibular impression of 80 dentate patients was taken and poured with dental stone. Retromolar pad area, mesial of canine and the lingual cusps of each posterior tooth marked on the cast and then transferred to the graded paper. Distance of each lingual cusp from the internal line of Pound triangle was measured. Data were analyzed with SPSS version 16.0. Result: In the study group, the average distance of lingual mandibular cusp from the internal line of Pound triangle was 1.69 mm in first premolars, 0.94 mm in second premolars, 0.7 mm in first molars and 0.75 mm in second molars. Conclusion: In most cases, distance of lingual mandibular cusps was within 1 mm of Pound triangle. Results were more similar to the Pound rather than the Misch theory.
Pound triangle
Misch triangle
posterior teeth
2017
03
01
7
10
https://jdmt.mums.ac.ir/article_7891_e3325b9260a0eff0397a4282a25b7036.pdf
Journal of Dental Materials and Techniques
JDMT
2322-4150
2322-4150
2017
6
1
Oral manifestations and related factors of HIV positive patients in south-east of Iran
Shirin
Saravani
Tahereh
Nosratzehi
Sarvar
Mir
Introduction: Oral manifestations can be the first signs of human immunodeficiency virus/acquired immunodeficiency syndrome (HIV/AIDS) and a useful marker for the progression of this disease. The present study aimed to determine the prevalence of oral manifestations and examine their relationship with socio-demographic factors in HIV-positive patients in the health centers affiliated to Zahedan University of Medical Sciences (Southeast Iran). Methods: In this cross-sectional study in addition to determining oral manifestations based on the classification of EC-clearing house (European Commission clearing house), information such as age, gender, marital status, residence, education, occupation, habits, oral hygiene, loss of weight in the last six months. Body Mass Index (BMI), mode of HIV transmission, stage of disease, anti-retroviral therapy (ART), and duration of HIV were gathered through direct question from the patients or the information contained in their records. Then the relationship between various factors and oral manifestations was analyzed using Chi-square, Fisher’s Exact Test, Student T Test, Mann- Whitney tests and logistic regression. Results: Oral examination was performed on 119 HIV-positive patients who were 69.7% male and 30.3% female and had a mean age of 35.4±12.7 years. Oral manifestations were found in 57.1% of the patients. Pseudomembranous candidiasis (34.1%) and linear gingival erythema (33%) were the most common lesions in these patients. The probability of oral manifestations occurrence increased with age and duration of smoking in smokers with HIV (P=0.036 and P=0.012, respectively). Conclusion: Most oral manifestations were those strongly associated with HIV infection (91%). Timely diagnosis and treatment of oral manifestations in HIV patients should be considered in conjunction with other treatments.
Human immunodeficiency virus
Acquired immunodeficiency syndrome
oral manifestation
Oral lesions
Risk Factor
2017
03
31
11
18
https://jdmt.mums.ac.ir/article_7871_c93faab43583c78080bf35fa702b7090.pdf
Journal of Dental Materials and Techniques
JDMT
2322-4150
2322-4150
2017
6
1
Effects of three different mouthwashes on the surface characteristics of nickel-titanium and Stainless steel archwires in orthodontics
Maryam
Omidkhoda
Maryam
Poosti
Zoha
Sahebnasagh
Seyed Mojtaba
Zebarjad
Zahra
Sahebnasagh
Introduction: Patients are recommended regular using of mouthwashes to control dental caries or periodontal diseases since orthodontic treatment may have detrimental effects on the tooth structures. However, chemical agents may potentially damage metal components of orthodontic appliances. The aim of this study was to evaluate the influence of three mouthwashes on the surface characteristics of nickel–titanium (NiTi) and Stainless steel (SS) arch wires. Methods and Materials: 15 pieces of 0.016 inch NiTi and 15 pieces of 0.016-inch SS wires were randomly assigned into 5 groups including 2 controls (as- received and artificial saliva) and 3 experimental groups. The samples in all groups were stored in artificial saliva in an incubator at 37˚C for one month, after that, the test groups were immersed in Chlorhexidine 0.12%, Hydrogen peroxide 0.12% and Persica mouth washes for 30 min, 1.5 h and 1.5 h, respectively. Then, the samples were washed by distilled water and returned to artificial saliva for more than two months. Surface topography changes and the number of corrosion holes were characterized via a scanning electron microscope (SEM).Two way ANOVA and Tukey tests were used to compare groups. Results: SEM photographs of the present study showed significant corrosion rate among "as- received" group and Persica (p=0.04), Chlorhexidine (p=0.02), and artificial saliva group (p=0.008) in NiTi wires, but there was no significant difference in the surface topography between any of the groups in SS wires. Conclusion: Alterations in surface of NiTi wires were significantly more than SS wires. Although not significant, 0.12% Chlorhexidine and Peroxide showed higher pitting view on SS and NiTi wires, respectively compared to other mouthwashes
Mouthwashes
Nickel-titanium
Orthodontics
Stainless steel
2017
03
01
19
26
https://jdmt.mums.ac.ir/article_8106_7dfc3d7008b30f361d4da370d9818ee5.pdf
Journal of Dental Materials and Techniques
JDMT
2322-4150
2322-4150
2017
6
1
Cast Partial Denture versus Acrylic Partial Denture for Replacement of Missing Teeth in Partially Edentulous Patients
Pramita
Suwal
Raj Kumar
Singh
Ashok
Ayer
Deepak Kumar
Roy
Roshan Kumar
Roy
Aim: To compare the effects of cast partial denture with conventional all acrylic denture in respect to retention, stability, masticatory efficiency, comfort and periodontal health of abutments. Methods: 50 adult partially edentulous patient seeking for replacement of missing teeth having Kennedy class I and II arches with or without modification areas were selected for the study. Group-A was treated with cast partial denture and Group-B with acrylic partial denture. Data collected during follow-up visit of 3 months, 6 months, and 1 year by evaluating retention, stability, masticatory efficiency, comfort, periodontal health of abutment. Results: Chi-square test was applied to find out differences between the groups at 95% confidence interval where p = 0.05. One year comparison shows that cast partial denture maintained retention and stability better than acrylic partial denture (p< 0.05). The masticatory efficiency was significantly compromising from 3rd month to 1 year in all acrylic partial denture groups (p< 0.05). The comfort of patient with cast partial denture was maintained better during the observation period (p< 0.05). Periodontal health of abutment was gradually deteriorated in all acrylic denture group (p<0.05). Conclusions: With adequate maintenance of oral and denture hygiene at a regular interval, cast partial denture compared with acrylic partial denture provides better results in terms of retention, stability, comfort and periodontal health of abutment.
Dental prosthesis retention
Denture base
Masticatory efficiency
periodontal health of abutment
Removable partial denture
2017
03
01
27
34
https://jdmt.mums.ac.ir/article_7841_bec5ed3032bd8fbc08f1c2c07b85ef59.pdf
Journal of Dental Materials and Techniques
JDMT
2322-4150
2322-4150
2017
6
1
Central Giant Cell Granuloma of the Jaws: Correlation between Vascularity and Biologic Behavior
Saede
Atarbashi Moghadam
Maedeh
Ghorbanpour
Introduction: Giant cell lesions of the bone comprise a group of jaw bone pathologies. Different pathogeneses such as reactive, vascular or neoplastic have been proposed for these lesions. In addition, differentiating between aggressive and nonaggressive central giant cell granuloma (CGCG) of the jaws based on histopathologic features is still impossible and due to different treatment protocols for the two groups, correct diagnosis is necessary. The purpose of this study was to compare the expression of CD34 between aggressive and nonaggressive CGCGs of the jaws. Methods & Materials: This retrospective study was carried out on 16 paraffin blocks in each aggressive and nonaggressive CGCGs group. The expression of CD34 was evaluated with immunohistochemical technique. Afterwards, t-test was used for quantitative evaluation and comparison of CD34 expression among the two groups. Eventually, statistical analysis was performed using Spss20 software. Significance was assigned at p < 0.05. Results: In the present study, the average age of patients in aggressive and nonaggressive groups was 20.93±8.08 and 26.18±16.97, respectively. In both groups, female predilection was observed. Mandible was the most common site of involvement in the aggressive group and the distribution of nonaggressive lesions was equal between both jaws. Although the expression of CD34 in the aggressive group was higher than the nonaggressive group, no statistically significant difference was seen (p=0.15). Conclusion: According to the results of the current study, it appears that CD34 protein cannot be used for identifying the clinical behavior of CGCGs.
Central Giant Cell Granuloma
CD34
immunohistochemistry
Vascularity
Aggressive
Nonaggressive
2017
03
01
35
39
https://jdmt.mums.ac.ir/article_8103_952cf2a88816609a4d5332e25729c638.pdf
Journal of Dental Materials and Techniques
JDMT
2322-4150
2322-4150
2017
6
1
Hybrid Odontogenic Lesion: A Rare Entity
Reza
Imani
Naghmeh
Jamaatloo
Maryam
Seyedmajidi
Oveis
Khakbaz Baboli
Hybrid tumors are very rare tumors composed of two different tumor entities, each of which conforms to an exactly defined tumor category. A 14-year-old boy was referred for an intraosseous painless lesion with a histopathological feature of multiple odontogenic lesions including calcifying odontogenic cyst, complex odontoma and ameloblastic fibro-odontoma. The final diagnosis considered to be a hybrid odontogenic lesion.
calcifying odontogenic tumor
odontoma
hybrid lesion
2017
03
01
40
43
https://jdmt.mums.ac.ir/article_7438_194ee291b80b68eff85bea3ff5908c7b.pdf
Journal of Dental Materials and Techniques
JDMT
2322-4150
2322-4150
2017
6
1
Endodontic Therapy of the Periapical Lesion in the Anterior Mandibular in a Patient with Tricho-Dento-Osseous Syndrome and Consumer of Immunosuppressive Drug: A Case Report
Elaheh
Moghim Farooji
Zeinab
Kazemi
Saeed
Moradi
Tricho-Dento-Osseous syndrome is a rare autosomal dominant disorder. Immunosuppressive drugs, though critical to the treatment, have undesirable effects on patient's healing process. This is a case report of a 10-year-old female, suffering from Tricho-Dento-Osseous syndrome who was under treatment with penicillamine. As the dental treatment was sought too late, both central and lateral incisors on the right side of mandible had severe enamel hypoplasia and tooth necrosis was evident. A large lesion was found in anterior mandible. After proper treatment of the teeth with appropritately considering the systemic condition of the patient, the favorable result was achieved.
Endodontic therapy
Tricho-Dento-Osseous syndrome
Immunosuppressive drug
D-penicillamine
2017
03
01
44
47
https://jdmt.mums.ac.ir/article_7375_b2248fe6cb4e4ee74dcf4920866efd13.pdf