Journal of Dental Medicine

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Normal 0 false false false EN-US X-NONE AR-SA As special microbial species are identified as etiologic factors for periodontal diseases and since conventional periodontal treatments could not eliminate these factors, Using Antimicrobial agents as alternatives to prevent  post operation  infections seems essential. In This study Phenytoin (Gel 10%) was used as an topical antimicrobial agent in periodontal surgeries. 21 patients with advanced periodontal disease were selected. Sampling was carried out before and after the surgery. The results showed that phenytoin can act effectively on gram positive and negative cocci while this concentration was not effective to eliminate opportunistic gram negative bacilli.

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Normal 0 false false false EN-US X-NONE AR-SA Osteodistraction is a technique for increasing the length of bone in order to form new bone by using  natural bone healing mechanism of the body. In general,  Osteotomy surgery ( corticotomy) is done in the place which bone lengthening is needed. Then an external fixator  is installed that is continuously lengthened and forms new bone at the same time.  Distraction biology, Indications and contraindications in maxillofacial region and different methods of it is discussed in current article.

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Normal 0 false false false EN-US X-NONE AR-SA  Teeth and periodontal ligaments can resist more efficiently opposing vertical forces parallel to their axial axis in comparison to horizontal forces. Thus, in designing dental prostheses and preserving interocclusal relationships we should notice to eliminate horizontal forces on teeth. A partial prosthesis can rotate in vertical, horizontal and Sagittal axis and by understanding levers and designing appropriate frameworks these rotations can be avoided.

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Normal 0 false false false EN-US X-NONE AR-SA Present study is conducted to evaluate antifungal activity of the denture cleansing solutions made in Iran. 40 patients who were diagnosed as chronic atrophic candidiasis after laboratory tests confirmation, were selected .Before and after using denture cleansing solution, their maxillary denture were sampled by a swab. The samples were cultivated and the resulting colonies were counted and the exact number of the colonies in 1cc of each suspension was determined. It was found that after using the solution, cultivation results were negative. Therefore, this solution has the potential to eradicate all the fungi causing chronic atrophic candidiasis.

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Normal 0 false false false EN-US X-NONE AR-SA The study's purpose was to estimate the value of symphysis morphology as a standard for anticipating direction of mandibular growth. 160 patients were sampled (80 f/80 m) and formed 8 groups based on gender,age and growth spurt. Mandibular growth direction was evaluated via 6 cephalometric indices: Mandibular Arc angeles, Lower facial Height, Facial Axis , Facial Angle ,Facial Taper and Mandibular Plane. Height, depth and their ratio and angle of symphisis were measured. The highest relation found among 13-16 yrs females as well as +20yrs males. Symphysis angle showed the highest relation in male patients. In 9-12 yrs females and 10-14 male patients in which anticipating the growth is highly needed, the relationship between symphysis morphology and mandibular groth indices was not significant.

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Normal 0 false false false EN-US X-NONE AR-SA In this clinical and paraclinical  research carried out in 15 months, 83 individuals were selected among private office patients who were then decreased to 32 after consideration of  some predesigned conditions of the study. 18 male patients of 6-11 yrs and 14 female patients of 5.5-9 yrs were participated in the study. Following scientific evaluations these results were obtained: abnormal size and function of the tongue can cause dentoskeleteal disorders and complications in other anatomical structures and physiological activities of the oral cavity even in absence of any other etiological factor. Neglecting this can lead to failure of orthodontic treatments and can be an important factor causing relapse. Besides, we cannot declare that the tongue volume is whether complementary to the forces or not. In conclusion, increased function because of increased tongue volume and growth can cause dental or dentoskeletal disorders.

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Normal 0 false false false EN-US X-NONE AR-SA Adhesive restorations have been introduced to dentistry for almost 3 decades and it could be stated that from that time there has been lots of ups and downs until emersion of current restorations. What was focused the most at the time of introducing these restorations was their long lasting estimated strength which has undergone many studies and now everyone is aware of their advantages and disadvantages. Although their real adhesion to teeth is still ambiguous and wide researches on biomechanics of oral cavity and the relation with adhesive restorations are in process. This article is aimed to present a novel method for preparation of metal surface. In first part, the process of research is explained and in two following parts the process of new method evolution and theoretic principles are mentioned. Finally, there is a 7 year report of clinical cases using new method.

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Normal 0 false false false EN-US X-NONE AR-SA Canine retraction was done for 19 patients. Movement , Tipping and rotation of canine and molar movements  was done by two approaches of sliding hook and sliding mechanics using 16% wire and 18% twin edgewise brackets and were compared. 350 g force via elastic chin was applied and measurements were done both intra- and extraorally. There was not any significant statistical difference between canine and molar movements in both approaches. Canine Tipping and rotation in two approaches showed significant difference. In fact, both were lower in sliding hook approach than sliding mechanics. As lower tipping results were obtained in sliding hook approach, it is suggested to apply this method to bodily retract canine.

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Normal 0 false false false EN-US X-NONE AR-SA Crown retention is related to its adaptation with tooth while there is always a gap between the crown and prepared tooth. Although this gap is filled with cements but the mechanical retention between axial walls and internal surfaces is decreased. Therefore, what is the relation between die spacer and crown retention? Does it affect retention? And if so, what is the best thickness of it? It has been a long time that various techniques are recommended and used to improve the adaptation of crowns. According to Fusayama and based on some other researches, it can be concluded that by using die spacer we can noticeably decrease the thickness of cement and improve the adaptation of cement. In addition, many studies on thickness and amount of die spacer concluded that by using die spacers, in %55 of cases crown retention was increased while in 30% decreased and 10-15% have not changed. Hence, it seems that using die spacer is generally beneficial and the best thickness of it according to our research is 2-4 layers that can improve retention by 41%.

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According to the direct confrontation of dentist to oral complications of patients receiving radiotherapy, this study was conducted in Cancer institute of Imam Khomeini hospital in 1376-1377. Through this study, 70 patients expecting more than 4500 CGY radiation in salivary gland area was examined for xerostomia signs and symptoms . Artificial saliva and placebo were prescribed for patients to assess the results on xerostomia. The obtained results showed VA-oralube is significantly more effective in decreasing radiation complications (mucositis, dorsal tongue surface atrophy, pain and burning sensation of mucosa, dysphagia, oral ulcers, mucosal necrosis and gingivitis) than placebo or water. Due to the other advantages of artificial saliva such as fluride content and minor side effects, it should be prescribed in patients suffering from xerostomia as it can increase their life expectancy by reducing pain and discomfort.

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  A 48 year old patient was candidate for anterior mandibular reconstruction by 2 fixtures of Branemark implant. Residual infection lead to removal of one of the implants from the extracted tooth socket. Afterwards, 2 fixtures of Bonefit was inserted adjacent to previously placed Branemark implants and final prosthesis were loaded in a joint cemented and screwed design.

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  Periodontal infections are categorized into various groups based on patient’s age or bacteria presented in dental pockets. There are Juvenile periodontitis, rapidly progressing periodontitis and adult periodontitis. Adult periodontitis is known as the most prevalent cause of tooth loss in adult patients. In current study, 100 teeth of patients who suffered from adult periodontistis were selected, cultured in kapnophil media and analyzed for containing Actinobacillus actinomycetemcomitans bacteria. 34 teeth of 17 patients contained this bacteria. Further discussions are mentioned in the article about sex,age and location of infection in these patients in association to the bacteria presence.

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  Monozygotic twins are genetically identical individuals who can also be mirror image twins and the Differences between them result from environmental factors. current study, monozygotic twins were analyzed in different dentitions of primary, mixed and permanent. As a conclusion, although genetic factors are naturally potent, environmental factors’ role can be increased and weaken the genetic factors.

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  Since 3 decades ago, dental equipments and technologies as well as materials have been greatly improved and numerous effective treatment modalities have been discovered. As a result, the number of survived teeth have been greatly increased and many studies have been conducted in this regard. Fluride therapy is found as an effective treatment modality and can reduce dental caries up to 60%, due to recent evidences.

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  In this double blind clinical survey, 40 healthy candidates of mandibular thir molar surgery were selected and randomly allocated into two groups of 20. First group was asked to administer Chlorhexidine 0.2% mouth wash prior to the operation while the other group used normal saline for 60 seconds before the surgery. Mouth opening was measured before surgery and in 1^st, 3^rd, 7^th days following the operation. Statistical analysis revealed significantly more mouth opening (lower level of trismus) in patients utilizing chlorhexidine before surgery.

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  The major foible of dental ceramics is their brittle nature. Therefore, the producers of these materials have focused on the “strength” issue. A method of increasing strength is ion exchange on porcelain surface which leads to formation of a compressive crust that opposing forces should overcome before developing a crack. In current study, ion exchange in two types of porcelain, Ceramco II which is used in PFM restorations and Colorloic veneer which is used for laminates, veneers, inlays and onlays, are evaluated. Additionally, laminate porcelains, etching effect on strength of porcelain and interaction of acid etching and ion exchange have been studied.

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  In 1996 Grinspan et al presented the association between primary hypertension and diabetes mellitus as Grinspan Syndrome. Through various studies, Researchers have noticed that epidermal lichen planus cells show enzymatic disorders as well as defective carbohydrate expression. Therefore, it was assumed that there is a relationship between cells and hormones in metabolic actions. Besides, some researchers presented the possible relation between hormonal dysfunction and immunological disorders leading to lichen planus development. It was found that primary hypertension is not related to lichen planus and lichen planus is presented in hypertensive patients as a result of antihypertensive medications. Therefore, the majority of studies in this regard have been focused on diabtese and lichen planus, their prevalence , comparing patients with the control groups and the association between blood sugar, blood fats , antihypertensive drugs and lipid lowering drugs.

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  Current study is aimed to compare fluride release in conventional glass ionomer, light-cured glass ionomer and compomers. Standard samples from the aforementioned materials were prepared and measured by selective fluride ion electrode in intervals of 24hours, 1,2,3 and 4 weeks in neutral PH of 7 and acidic PH of 4.5. The obtained data represented that fluride ion release decreased in time but the pattern of this issue was different. Besides, it was found that in lower Ph fluride release is significantly affected. Compomer relatively releases less fluride than the others but as long as this amount can sufficiently prevent caries development, it can be stated that based on clinical status any of above choices can be selected. Besides, the more easily handled and available materials are used, the more successful the clinical results will be achieved.

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In Present study a digital model of hemimaxillectomy was reconstructed by computer and stress distribution of removable partial dentures in tissues, periodontal ligament and bone were thoroughly evaluated. The maximum stress of two different removable partial denture designs which contained buccal and lingual c-shaped clasps respectively were analyzed and compared. It was assumed that a 90 gram force which is equal to an average obturator’s weight is applied outwardly. The results showed that the maximum stress distribution in these two designs is not significantly different.

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  This survey is aimed to retrospectively analyze the frequency rate of facial bone fractures based on sex, age, location, quality, risk factors and complications in order to assist medical practitioners and surgeons in improving educational and therapeutical plans and developing novel tools and methods. For this purpose, 274 patients with facial bone fractures were recruited through a two-year survey ( 1375-1376). The results revealed that car accidents ( 48.9%), fall from heights (27%) and street fights ( 20.4%) were the most important reasons leading to facial bone fractures. Among the study group, Men to women ratio was 3.3 to 1 and the average age was 25.8 years. 52.9% of fractures (most fractures) were happened in mandibular bone and the least prevalent fractures were reported in nasal bone ( 6.5%). The most critical pre or post-treatment complications associated with facial bone fractures were death (1%) and blindness (1%).