Penetration and Tensile Strength of Various Impression Materials of Vinylsiloxanether, Polyether, and Polyvinylsiloxane Impression Materials

Objectives The aim of this study was to evaluate and compare penetration ability and tensile strength among vinylsiloxanether (VSE), polyether (PE), and polyvinylsiloxane (PVS) elastomeric dental impression materials. Materials and Methods The models were constructed for penetration ability test by simulated gingival sulcus width and moist environment. The 0.05, 0.1, and 0.2 mm of simulated gingival sulcus widths were used. Each simulated gingival sulcus width was impressed 10 repeats per one elastomeric impression material. All extension of elastomeric dental impression materials was scaled by Measuring Microscope (MM-11; Nikon, Tokyo, Japan). On the issue of the tensile strength study, the models were constructed following type 1 of the ISO 37:2017 specifications and/or type C of ASTM.D412 specifications. The two-way analysis of variance (ANOVA) and Tukey's honest significant difference test were performed in the penetration ability test. The one-way ANOVA and Dunnett's T3 test were performed in the tensile strength test. The significance level was set at 0.05. Results PE showed the best extension into all widths of simulated sulcus followed by VSE and PVS, respectively. PVS was significantly higher in tensile strength than VSE and PE, while VSE was significantly higher than PE. Conclusion Penetration ability of elastomeric dental impression materials was depended on gingival sulcus width. The wider the sulcular width, the better the penetration ability of elastomeric dental impression materials. PE presented the best penetration ability, while the novel PVS showed highest tensile strength.

Desinfecção de material de moldagem na clínica odontológica: uma revisão integrativa da literatura

INTRODUÇÃO: Fazer uso de substâncias e técnicas de desinfecção dos moldes é fundamental para prevenir a infecção cruzada durante o ato da moldagem, principalmente durante a pandemia do Covid-19. OBJETIVO: Revisar a literatura de forma integrativa sobre a desinfecção de material de moldagem na clínica diária. MÉTODO: A pesquisa ocorreu pelo Lilacs e Pubmed, com a estratégia de busca ("dental impression materials" OR "disinfection techniques"). Os critérios de inclusão foram artigos completos e que abordavam os métodos de desinfecção dos materiais de moldagem. Foram selecionados: estudo clínico randomizado, revisão sistemática, estudo clínico observacional, e estudo laboratorial, publicados entre 2010 a 2020 e escritos em português, inglês ou espanhol. Os critérios de exclusão foram artigos que abordavam outras propriedades dos materiais de moldagem, relacionados somente ao fluxo digital, sobre efeitos da radiação ultravioleta no ambiente clínico, estudos sobre desinfecção do canal radicular e todas as produções que não continham as variáveis estudadas. A seleção dos artigos foi realizada com base nos resumos ou abstracts; e em seguida foi realizada a extração e análise dos dados. RESULTADOS: Os estudos clínicos e laboratoriais foram os mais prevalentes (04 artigos), Todos os desinfetantes e técnicas propostos promoveram a desinfecção dos materiais de moldagem, até mesmo a lavagem em água. O hipoclorito de sódio foi a substância mais pesquisada em diversas concentrações, assim como o hidrocolóide irreversível para os materiais de moldagem. CONCLUSÃO: A lavagem com água, somada à ação de uma substância ou técnica de desinfecção, é favorável para redução de microrganismos sobre o molde e visa evitar a contaminação cruzada na clínica odontológica.

Foreign body of endodontic origin in the maxillary sinus

Displacement of foreign bodies into the maxillary sinus is still a rare pathology, but the incidence is increasing continuously with the development of dental procedures. Most cases of foreign bodies are associated with dental procedures. These can be of varying natures, such as dental implants, fractured teeth roots, endodontic materials and tools, dental burs, dental impression materials or dental fillings materials. Less frequent are the foreign bodies of non-dental origin, which are related to facial injuries in accidents or assaults. The diagnosis is based on careful clinical and radiological examinations. Foreign bodies should be diagnosed and treated on time in order to prevent complications, mainly acute or chronic rhinosinusitis. In this article, we review the main characteristics regarding the incidence, etiology, diagnosis and treatment options – endoscopic and an external approach for the removal of a displaced foreign body into the maxillary sinus. Also, we present our personal experience and treatment options, highlighting the importance of pre-operative evaluation, proper imaging assessment, adequate access and visibility and adequate surgical technique, in order to prevent later sinonasal infectious complications.

Excision of Lower Lip Mucocele Using Injection of Hydrocolloid Dental Impression Material in a Pediatric Patient: A Case Report

Oral mucocele is a benign cystic exophytic lesion affecting the minor salivary gland and is especially present in pediatric patients (3% under 14 years). It is characterized by an extravasation or retention of fluid or mucus in the submucosal tissue of the minor salivary glands. Several surgical techniques have been proposed over the years, including the excision of the mucocele by using the injection of a hydrocolloid impression material in the light of the cyst to prevent the collapse of the cystic wall and solidify the lesion, resulting in a better cleavage plan. The combined clinical approach between the combination of Shira’s technique and the surgical excision of the cystic lesion results in a conservative surgical removal of the lesion. Here, we reported the removal of a labial mucocele in a 14-year-old male patient, using the injection of a hydrocolloid impression material. At a 12 months follow up, the patient showed complete healing of the surgical site, showing a pinkish lip lining mucosa without scarring or recurrence of the primary lesion. The combined therapeutic approach between Shira’s technique and surgical excision allows a safe and predictable excision of the labial mucocele, minimizing the risk of recurrence.

Use of silicones in fixed aesthetic rehabilitations: clinical case

Molding in a fixed prosthesis is one of the most important stages in rehabilitative treatment, as it is there that attempts are made to reproduce dental preparations and adjoining regions by using appropriate materials and techniques. Among the fixed prosthesis molding materials available on the market, the elastomers stand out, which are polymers where the prey occurs through the increase of the chain and the establishment of cross-links. The objective of the study is to present a clinical case and perform a literature review on the use of condensation silicone and addition to molds in Fixed Prosthesis. In this literature review, a survey of PubMed, Scielo and Lilacs data was performed, using the descriptors: Denture, Partial, Fixed; Dental Impression Materials and Elastomers. It is possible to conclude that in the field of Dentistry, the elastomers, among them the condensation-cured and addition-cured silicones, both provide high precision models and are the most used materials in works with fixed partial dentures. Therefore, it is up to the professional to know the properties and adapt to the best group of chosen materials.

PREVENTION AND CONTROL OF CROSS INFECTION AT DENTAL LABORATORIES IN EAST JAVA PROVINCE OF INDONESIA

Background: infectious disease is one major important health issue. Dental technician is an occupation which has a risk to get infectious disease transmitted from saliva, blood or contaminated tools if universal precaution utensils did not use properly. Infection can be transferred through dental impression from surface contact, handpiece, burs, pumice, aerosol etc. Purpose: This study aim to find out desinfection implementation in dental laboratories located in East Java as a preventive and controlling action towards cross infection. Method: Data were obtained through questionnaire, the questionnaires were designed to get the information related to infection control from dental laboratories in East Java. The survey was conducted in 36 dental laboratories listed by Association of Dental Technician in East Java. Result: As much as 90% dental laboratories did not performed desinfection procedure to the dental impression received from dentist and never follow any desinfection training. AS much as 95% Dental laboratories believe universal precaution utensils can be infected but only 50% utilize universal precaution utensils. Eventhough if such infection occurs, the owner will be fully responsible. Conclusion: Prevention and management towards cross infection control in dental laboratories located in East Java still very low. Development and supervision towards dental laboratories operational by Indonesian government and professional association need to be improved. Education regarding infection control need to be performed through trainings and inserted infection control matters in dental technician study programme curriculum in Indonesia.