Evaluation of cytotoxicity levels of poly vinyl ether silicone, polyether, and poly vinyl siloxane impression materials: An  in vitro study

Rajasimhan, N Vivek; Jayaraman, Srinivasan; Ali, Doulathunnisa Jaffar; Subramanian, Balanehru

doi:10.4103/jips.jips_261_19

Cited by 6 publications

(1 citation statement)

References 28 publications

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“…Generally, the shorter the contact between the tooth structure and impression materials, the less damage will be caused to the dental pulp [ 64 ]. However, polyethers have been found to be more toxic to fibroblast cells than polyvinyl siloxanes in human and animal studies [ 65 – 68 ]. Nonetheless, pulp necrosis does not appear to be impacted by the fabrication material applied to indirect restorations (i.e., PFM or ceramics).…”

Section: Discussionmentioning

confidence: 99%

Incidence and influential factors in pulp necrosis and periapical pathosis following indirect restorations: a systematic review and meta-analysis

et al. 2023

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Background Restoring vital teeth with indirect restorations may threaten dental pulp integrity. However, the incidence of and influential factors on pulp necrosis and periapical pathosis in such teeth are still unknown. Therefore, this systematic review and meta-analysis aimed to investigate the incidence of and influential factors on pulp necrosis and periapical pathosis of vital teeth following indirect restorations. Methods The search was conducted in five databases, using MEDLINE via PubMed, Web of Science, EMBASE, CINAHL, and Cochrane Library. Eligible clinical trials and cohort studies were included. The risk of bias was assessed using Joanna Briggs Institute’s critical appraisal tool and Newcastle–Ottawa Scale. The overall incidences of pulp necrosis and periapical pathosis following indirect restorations were calculated using a random effects model. Subgroup meta-analyses were also performed to determine the potential influencing factors for pulp necrosis and periapical pathosis. The certainty of the evidence was assessed using the GRADE tool. Results A total of 5,814 studies were identified, of which 37 were included in the meta-analysis. The overall incidences of pulp necrosis and periapical pathosis following indirect restorations were determined to be 5.02% and 3.63%, respectively. All studies were assessed as having a moderate-low risk of bias. The incidence of pulp necrosis following indirect restorations increased when the pulp status was objectively assessed (thermal/electrical testing). The presence of pre-operative caries or restorations, treatment of anterior teeth, temporization for more than two weeks, and cementation with eugenol-free temporary cement, all increased this incidence. Final impression with polyether and permanent cementation with glass ionomer cement both increased the incidence of pulp necrosis. Longer follow-up periods (> 10 years) and treatment provided by undergraduate students or general practitioners were also factors that increased this incidence. On the other hand, the incidence of periapical pathosis increased when teeth were restored with fixed partial dentures, the bone level was < 35%, and the follow-up was > 10 years. The certainty of the evidence overall was assessed as low. Conclusions Although the incidences of pulp necrosis and periapical pathosis following indirect restorations remain low, many factors affect these incidences that should thus be considered when planning indirect restorations on vital teeth. Database registration PROSPERO (CRD42020218378).

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Section: Discussionmentioning

confidence: 99%

Incidence and influential factors in pulp necrosis and periapical pathosis following indirect restorations: a systematic review and meta-analysis

et al. 2023

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Recent update on potential cytotoxicity, biocompatibility and preventive measures of biomaterials used in dentistry

et al. 2021

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Elastomeric impression materials used in modern orthopedic dentistry

Bordina,

Lopina,

Andreev

2024

Russian Journal of Dentistry

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The article presents a review of elastomeric impression materials used in orthopedic dentistry at the present time. As is known, the elastomer group is divided into silicone, polyester, thiocol (polysulfide) materials. Silicone impression materials are characterized by wide application in orthopedic dentistry. The structural basis of silicone materials is polymethylsiloxane with active terminal hydroxyl groups. Polyester impression materials are complexes consisting of two pastes the main and the catalyst. The main paste contains low-molecular-weight polyester with terminal ethylenimine groups, as well as fillers such as colloidal silicon oxide and plasticizers. The catalyst paste contains aromatic ether of sulfonic acid. When these two pastes are mixed, ionic (cationic) polymerization will occur, starting with the formation of a primary alkyl radical, then the ethylenimine ring opens, followed by the growth of macromolecular chains and their crosslinking. Polysulfide are available in the form of two pastes, the main and the catalyst, of different colors, which are mixed immediately before performing the work. The main paste contains polysulfide or mercaptan rubber, and the catalyst paste contains an oxidizer. It should be noted that lead oxide is most often used as an oxidizer. The resulting polymer does not have a stereoregular structure, which causes its stickiness. It is technologically very difficult to obtain a polymer with a stereoregular structure. Having carried out a theoretical comparison of the listed types of elastomeric impression materials according to their properties, chemical composition, advantages and disadvantages, it is possible to distinguish polyester and polysulfide impression materials as more advanced, and silicone have a large number of disadvantages, but are often used in dentistry due to the presence of domestic representatives and relatively low cost.

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Evaluation of cytotoxicity levels of poly vinyl ether silicone, polyether, and poly vinyl siloxane impression materials: An in vitro study

Cited by 6 publications

References 28 publications

Incidence and influential factors in pulp necrosis and periapical pathosis following indirect restorations: a systematic review and meta-analysis

Incidence and influential factors in pulp necrosis and periapical pathosis following indirect restorations: a systematic review and meta-analysis

Recent update on potential cytotoxicity, biocompatibility and preventive measures of biomaterials used in dentistry

Elastomeric impression materials used in modern orthopedic dentistry

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