ABSTRACT
This study was conducted to determine the effect of varying curing conditions on the residual monomer concentrations of heat cure acrylic denture resin
Sixty-four disc shaped acrylic resin specimens were processed at four powder-liquid ratios [2.22, 2.00, 1.80 and student-ratio] and cured in a heated water bath using 4 different curing regimes [two with a terminal boil and two without]. The residual monomer concentrations were determined at intervals of 24, 48 and 72 hours using a UV Spectrophotometer
The results indicated a decrease in residual monomer concentration with storage time. Group 4 [student-ratio] and curing by cycle 2B [placing the assembly in the water bath directly at 100°C] showed the highest overall residual monomer concentrations while group 1 [highest powder-liquid ratio] and curing by cycle 1A showed the least overall residual monomer concentrations It was concluded that students dispensing acrylic powder and liquid monomer without calculations would lead to higher residual monomers if a proper curing regime is not followed. Using a 60 minute terminal boil in the polymerization process is strongly recommended. Storing the acrylic denture bases for at least 24-48 hours in water before use will decrease residual monomers being leached into the oral environment
Subject(s)
Dental Materials , Dentures , Polymethyl Methacrylate , Self-Curing of Dental Resins , Hot TemperatureABSTRACT
Objective of the study was to determine the effect of varying powder liquid ratios and curing conditions on the residual monomer concentrations of heat cure acrylic denture resin. Sixty four disc shaped acrylic resin specimens were processed at four powder-liquid ratios [2.22, 2.00, 1.80 and student-ratio] and cured in a heated water bath using 4 different curing regimes. Curing cycles 1A and 1B initiated curing of specimens at room temperature followed by a terminal boil for 60 and 30 minutes respectively. Cycles 2A and 2B initiated curing at 70°C and 100°C respectively, without any terminal boil. The residual monomer concentrations were determined at intervals of 24, 48 and 72 hours using a UV Spectrophotometer.Regression analysis indicated a moderately strong negative correlation [-0.515] between time and residual monomer concentration which suggests residual monomer concentration decrease with storage time. Group 4 [student-ratio] and curing by cycle 2B [placing the assembly in the water bath directly at 100 degree C] showed the highest overall residual monomer concentrations while group 1 [highest powder-liquid ratio] and curing by cycle 1A showed the least overall residual monomer concentrations. Independent t tests between groups however revealed mean residual monomer concentration of samples cured by cycle 2B [0.32 +/- 0.38] to be greater than the mean [0.06 +/- 0.07] of samples cured by Cycle 1A [p value= 0.02] suggesting that cycle 1A will produce less residual monomers irrespective of the powder-liquid ratio.It was concluded that students dispensing acrylic powder and liquid monomer without calculations would lead to higher residual monomers if a proper curing regime is not followed. Using a 60 minute terminal boil in the polymerization process is strongly recommended. Storing the acrylic denture bases for at least 24-48 hours in water before use will decrease residual monomers being leached into the oral environment
ABSTRACT
The aim of this study was to assess the level of awareness about oral cancer among patients who visited Islamic International Dental Hospital, Islamabad, Pakistan. It was quantitative study that employed descriptive cross-sectional design. The Quantitative study design was selected because it was less time consuming and cost effective. This study included a pre-existing questionnaire. The pre-existing questionnaire was in English and Urdu language [national language of Pakistan]. It included 15 questions regarding patient knowledge about the spread of disease, etiology, prognosis, sign and symptoms, risk factors and treatment of the disease. All patients aged 18 years and above visiting [random sampling] Islamic International Dental Hospital, Islamabad during the specified period of time. [Between 20thJune - July 2011] were approached and invited to participate in the study. Maximum sampling of 100 patients including 60 male patients and 40 female patients were done. The respondents were then selected on the basis of filling the inclusion criteria. Pearson chi-square test and descriptive statistics such as frequency distribution and cross-tabulation were used to analyze the data through SPSS. Level of significance was set at 0.05 or smaller than this value. The final results show that 54% of the participants were only aware of the knowledge and awareness regarding oral cancer. A significant number of patients [29%] were found after going through all the data that were collected to be totally unaware or ignorant of the actual price that had to be payed for tobacco smoking. Lastly, only about 17% of the respondents had intermediate knowledge about mouth cancer. Regarding risk factors 95% expressed awareness that smoking and smokeless tobacco [including betel nut, pan and chalia] were cause of oral cancer and the P-value was also found to be significant [0.053].It was concluded that information regarding oral cancer knowledge was good
Subject(s)
Humans , Male , Female , Awareness , Health Knowledge, Attitudes, Practice , Surveys and Questionnaires , Risk Factors , Data Collection , Chi-Square Distribution , Early Detection of CancerABSTRACT
The purpose of this study was to explore patient preferences in their dental treatment decision making and establish their role as active, passive or collaborative. Questionnaire based cross-sectional. Department of Prosthodontics and the Executive private clinics of the Islamic International Dental College, Hospital from the 1[st] of February till the 30th of March 2012. A convenience sample of 80 patients, 40 recruited from the Department of Prosthodontics and 40 from the executive clinics at the Islamic International Dental College were interviewed and their preferences for participation in treatment decision making were established using a measurement tool designed to elicit decision-making preferences. Patient preferences for participation in treatment decision making were established using a simplistic modification of the Control Preference Scale [CPS] tool. This study found that 45% clinic patients perceived active/semi-active roles in treatment decision making, 42.5% chose passive/semi-passive roles. 90% patients interviewed at the Department of Prosthodontics preferred passive/semi-passive roles. Over all, out of 80 patients, 53 chose the passive/semi-passive roles. Patients presenting at the private clinics prefer being actively involved in their treatments, having said that, majority of them choose to get treatment from private clinics because they expect better services and have more trust in their doctors
ABSTRACT
To compare the accuracy of cephalometric measurements on photographed cephalograms with traditional manual tracing as the gold standard. Cephalometric analysis of specified measurements was performed on cephalometric radiographs manually. Radiographs were subsequently photographed with a digital camera and the images were analyzed digitally with computer software for the same measurements. Paired sample t tests were used for statistical significance [p<0.05]. Clinical significance was set as more than 2o difference between the methods forany angular measurement. Cephalometric comparisons between original and digital images showed statistically significant differences for eight measurements. None of the means of the difference between the angular measurements in the two methods exceeded 20. Photographed cephalograms are reasonably accurate but careful photography technique must beadopted
ABSTRACT
The objective of this study is to compare the orthodontic treatment need among male and female patients attending Islamic International Dental Hospital, Islamabad [IIDH]. Across-sectional study. Ten months from September 2007 to July 2008 at Islamic International Dental College. Index of Orthodontic Treatment Need 10TN] was used on a sample of 200 patients [100 male, 100 female] at Islamic International Dental Hospital, Islamabad Pakistan, to evaluate the need for orthodontic treatment. Using SPSS version 10.0 data was analyzed. Result showed that 36% of female patients and 41% of male patients needed definite orthodontic treatment according to Dental Health Component [DHC] whereas 12.5% female patients and 23.5% male patients were needed definite orthodontic treatment according to Aesthetic Component [AC]. According to AC greater percentage of males was found in definite treatment need than females [p =0.005], whereas DHC showed insignificant difference among males and females for definite treatment need [p =0.133]. According to AC, there is more need of treatment for males than females. Whereas according to DHC there is no significant difference between males and females in treatment need
ABSTRACT
This study was undertaken to evaluate the difference between two surgical techniques; gingivectomy incision and epithelial denudation forthe management of melanin pigmented gingiva. Quasi experimental study. Islamic International Dental College, Islamabad. Twelve patients with healthy periodontium and complaining of black pigmented gingival with 20- 30 years of age, who reported at Islamic International Dental Hospital, Islamabad were selected. Six of them were treated with gingivectomy incision and other six were treated with epithelial denudation. The results were quite promising indicating that patients undergoing epithelial denudation showed healing more rapidly with little post operative complaints as compared to patients undergoing gingivectomy. Although both techniques can be used for treatment of pigmented gingiva but epithelial denudation is better than gingivectomy in terms of less post operative pain and sensitivity and early healing of the lesion