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Introduction: Infection control is an important concept in the present day practice of dentistry. Elastomeric dental impressions too should be disinfected as per laid down protocols. Recently, vinylsiloxaether type of elastomeric impression material have been introduced which is supposed to have improved hydrophilic properties among others. This invitro study was taken up to compare wettability of vinylsiloxaether impression material in comparison to two other popular traditional elastomeric impression materials i.e polyether and addition silicone. Materials and Methods: An in-vitro study was undertaken to evaluate effect of four recommended commercially available disinfectant solutions on the wettability of three types of elastomeric impression materials at 10 and 30 minutes time intervals. The impression materials evaluated were vinylsiloxaether, addition silicone and polyether. The disinfectants used were 2% glutaraldehyde, 0.5% sodium hypochlorite, 0.05% iodophor and 0.25% benzalkonium chloride. 100 samples of each impression material was made and subjected to 10 different immersion protocols including distill water as control. The surface wettability (contact angle) of all samples was measured using the contact angle analyzer (Digidrop, Contact angle meter, GBX products, France). The data obtained was statistically analyzed. 'Two-sample t-tests', 'twoway-ANOVA' and 'tukey simultaneous test' was applied. Results: The mean contact angle values of addition silicone samples were highest among elastomers followed by polyether and vinylsiloxaether samples. The mean value of contact angles for 30 minutes immersion time interval was highly significant compared to the corresponding values of 10 minutes immersion time interval (P< 0.0001). In each case, the mean contact angles were higher for 30 minutes immersion time interval. Conclusion: Among the elastomeric impression materials evaluated, wettability wise vinylsiloxaether proved to be the best impression material followed by polyether and addition silicone. Disinfection with 2% glutaraldehyde had shown lowest contact angle values followed by 0.5% sodium hypochlorite solution, 0.25% benzalkonium chloride and 0.05% iodophor respectively.

(12)60016-1 sag-related deflection was less in Co-Cr alloys as compared with the Ni-Cr alloys, still Ni-Cr alloys in fixed dental prostheses frameworks are used due to their desirable physical and chemical properties. MJAFI 2012;68:145-150

Segmental or marginal resection of mandible leads to defects altering the physiological position and movements of mandible. This occurs due to altered muscular action and contracture of scar tissue. Guide flange is a conventional prosthesis that helps to guide the mandible and restores repeated positioning of mandible to improve mastication and to provide support to remaining structures. Immediate rehabilitation helps in maintaining the balance and counteracts unilateral action of muscles to provide stability. It is difficult to achieve favorable outcome with guide flange alone, if deviation is more and the muscular forces are strong. Adjunctive therapies like physiotherapy, maxillomandibular fixation with elastics, prosthesis anchored to natural teeth or forceful manipulation within physiological limits may be used to correct long standing deviation post surgery. This case report highlights use of (Maxillomandibular Fixation) MMF screws with orthodontic elastics to aid in proper functioning of guide flange prosthesis to restore masticatory efficiency.

Aim: The aim of this review was to investigate utility or futility of facebow for fabrication of complete denture prosthesis to maximise clinical efficiency and acceptability of complete dentures. Settings and Design: Systematic review following PRISMA guidelines. Materials and Methods: A study question was designed based on PICOT model which was used to evaluate whether facebow transfer is required or not for fabrication of complete denture prosthesis. An extensive search was carried out manually and using electronic databases such as PubMed-Medline, Cochrane, Google Scholar, and Clinicaltrials.gov. Parameters under review included patient satisfaction, masticatory efficiency, occlusal adjustments, clinician time, stability and retention. Boolean operators, MeSH terms and limiters were applied to develop the search and reach to conclusive studies pertaining to study design. Literature dated between 1950 and 2019 were selected. The data extraction and assessment of the studies was done by two independent investigators. Statistical Analysis Used: No meta-analysis was conducted due to heterogeneity of data obtained. Results: 13690 studies were shortlisted, 13672 were excluded based on title and abstract. By the end of search phase, 07 RCTs were considered relevant. 04 studies concluded comparable/ no differences in outcome with and without use of facebow for fabrication of complete denture prostheses, whereas 03 studies concluded better results without the use of facebow. Conclusion: The use of facebow results in fabrication of complete denture prostheses with similar results in terms of clinical efficiency and patient acceptability as compared to simplified techniques using anatomical landmarks. Variations in assessment criteria, non uniform distribution of sample size amongst different clinical trials and subjective questionnaire based criteria are the weaker links in the review. Extensive research and long term standardised studies with objective criteria for assessment are required for comprehensive and conclusive results to establish the need for change in clinical practice.

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