Context: Infection control is an important concept in the present day practice of dentistry. Disinfection of dental impressions is part of the daily routine in a dental clinics. After disinfection, it is important that impressions remain dimensionally stable. Aim: The purpose of this study was to compare the effect of chemical disinfectants and ultraviolet (UV) disinfection on the dimensional stability of the polyvinyl siloxane impressions. Objectives: The objective of the study is (1) To evaluate the effect of chemical disinfectant (2% glutaraldehyde and 1% sodium hypochlorite) and UV disinfectant on the dimensional stability of polyvinyl siloxane impression material. (2) Comparative evaluation of the dimensional discrepancy between the cast poured from the polyvinyl impressions material, that is subjected to chemical disinfectant and UV disinfectant to that of cast poured from impressions that were nondisinfected. Materials and Methods: A customized tray was fabricated to make impressions. Impressions were divided into four groups, 10 samples were disinfected with 2% glutaraldehyde for 20 min, 10 samples were disinfected with 1% sodium hypochlorite for 20 min, 10 samples were disinfected with UV light for 20 min, and 10 samples were not subjected to disinfection which served as control group. All the samples were poured after 30 min in die stone. Measurements were recorded using traveling microscope of 0.001 accuracy. Statistical analysis used in this study was the one-way ANOVA test. Results: The result showed significant dimensional changes in samples disinfected with 2% glutaraldehyde and 1% sodium hypochlorite, whereas samples disinfected with UV disinfectant unit showed no significant dimensional changes when compared with control group samples. Within the chemical groups, impressions disinfected with 1% sodium hypochlorite showed more discrepancy in the dimensions when compared to the 2% glutaraldehyde disinfected group. Conclusions: UV light disinfectant can be safely used to disinfect impressions as compared to chemical disinfectants in clinical prosthodontic procedures.

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Background: Loss of teeth affects the masticatory ability and overall health of the patient especially posterior teeth as they contribute more to mastication as compared to anteriors. Loss of teeth can lead to undesirable consequences and early rehabilitation with any type of prosthesis can lead to desirable changes and thus missing teeth should be replaced as soon as possible. Aims and Objectives: To determine the change in masticatory ability and quality of life (QoL) after replacement of missing posterior teeth by fixed dental prosthesis. Methodology: Maximum bite force was recorded before and after treatment. Also a self-perceived questionnaire was filled by the patient to assess the change in QoL. Patients with missing posterior teeth were included. Patients with acute infections or systemic diseases were excluded. Results: Significant change (p=0.0001) in both masticatory ability and QoL of the patient was seen. The co-relation of both was clinically significant while statistically non-significant (p=0.77). Results were significant for both the studied parameters but co-relation between them was no significant. It is because of the patients perceived satisfaction of the overall treatment. Conclusion: Rehabilitation of posterior teeth improves mastication and also overall oral health related QoL.

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