ABSTRACT
Objective: To evaluate the sealing ability of two different types of Glass Ionomer Cements [GICs] used for sandwich restorations and assess the effect of acid etching of GIC on microleakage at GIC-resin composite interface
Study Design: Experimental study
Place and Duration of Study: Department of Operative, DIEKIOHS [DUHS] and NED University, Karachi, from February to June 2011
Methodology: Eighty cavities were prepared on the proximal surfaces of 40 permanent human premolars [2 cavities per tooth], assigned to 4 groups [n=20] and restored as follows: Group CIE - Conventional GIC [CI] was applied onto the axial and cervical cavity walls, allowed setting for 5 minutes and acid etched [E] along the cavity margins with 37% phosphoric acid for 15 seconds, washed for 30 seconds and dried; the adhesive system was applied and light cured for 10 seconds, completing the restoration with composite resin light cured for 40 seconds; Group CIN - same as Group CIE, except for acid etching of the CI surface; Group RME - same as CIE, but using a resin modified GIC [RMGIC]; Group RMN - same as Group RME, except for acid etching of the RMGIC surface. Specimens were soaked in 1% methylene blue dye solution at 37[degree]C for 24 hours, rinsed under running water for 15 minutes, bisected mesiodistally and dye penetration was measured following the ISO/TS 11405-2003 standard. Kruskal Wallis and post Hoc tests significant differences in the microleakage among all the four groups
Results: There was a significant difference between the two groups of GICs [RMGIC and CI, p=0.001]. There was no significant difference in between the two sub-groups that is between CIN and CIE [p=0.656], and between Groups RME and RMN [p=0.995]
Conclusion: Phosphoric acid etching of GIC, prior to the placement of composite resin, does not improve the sealing ability of sandwich restorations. RMGIC was more effective in preventing dye penetration at the GIC-resin composite dentine interfaces than CI
ABSTRACT
The aim of this study is to describe demographic characteristic of 103 cases of major and minor salivary glands diagnosed at DDRRL [Dow lab Diagnostic reference and research laboratory] OJHA campus, DUHS Karachi. Observational Study. This study was conducted at Dow University of Health Sciences Ojha Campus, Karachi from January 2009 to April 2011. Salivary gland diseases are uncommon and include diseases which affect both major and minor salivary gland. They consist of a group of heterogeneous lesions with complex clinicopathological characteristics and distinct biologic behavior. Epidemiological data of these diseases in the various parts of the world can be helpful for a better understanding of its biology and clinical characteristics. Clinical and histopathological data of all patients with salivary gland diseases are retrospectively analyzed and described. In this study, 103 cases of salivary gland diseases be analyzed, out of all cases 31 were infections, 50 were benign neoplasms, and 22 were malignant neoplasms. Majority of the cases occurred in parotid gland followed by submandibular and minor salivary glands. Infections are common between the ages between 10-35 years and peak incidence in 30 years. Benign tumors are common between 20-25 years and 40-50 years and with a peak incidence in 40 years. Tumor affected more commonly the adult patients with peak incidence between 35065 years and peak incidence in 50 years with slight predominance in females. Pleomorphic adenoma is the most frequent finding followed by sialadenitis and squamous cell carcinoma. patients with salivary gland diseases were mainly adults with marginally more female patients. Most commonly found infections are sialadenitis involving sub mandibular gland in majority of cases. Benign tumors are more frequent then malignant ones. Pleomorphic adenoma is the commonest benign tumor and squamous cell carcinoma is the commonest malignant neoplasm. Both benign and malignant tumors involve parotid gland commonly