Most common mistakes and complications in impressions at fixed-prosthodontic constructions

Zlatanovska, Katerina and Kovacevska, Ivona and Longurova, Natasa and Naskova, Sanja and Zarkova-Atanasova, Julija and Atanasova, Sandra (2018) Most common mistakes and complications in impressions at fixed-prosthodontic constructions. Knowledge - International Journal, Scientific Papers, 23 (2). pp. 553-558. ISSN 2545-4439

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To get a quality impression is of great importance in prosthodontic therapy. The impression is a negative of the condition in the patient’s mount and it should be dimensionally stable in order to gain a good working model – positive, on which the prosthodontic construction will be made. Due to the fact that the indirect restorations are produced in a dental laboratory, it is of big significance to precisely fit the prosthodontic appliance without the need for their correction. This mostly depends from the quality of the impression and consequently the model cast with the condition in the patient’s mouth. Thus, allows faster and more efficient dental practice and at the same time to produce restoration which will help in prophylaxis of the periodontal tissue. Over the past 100 years, elastomeric impression materials have been continuously developed and optimized for improved precision, patient comfort and ease of use. However, there are also some factors that adversely affect the impression taking itself. All this can affect the size of the crown and it can be too big or too small. If we get a wider crown, intolerant marginal gaps appear, and in another situation, if the crowns are narrower, they do not reach the preparation line. Biological tolerance for marginal differences is almost unknown; however, there is positive correlation between marginal accuracy and damage to periodontal tissue and as well as the appearance of secondary caries in the case of imprecise fit. This problem mainly relates to restorations with subgingival and paragingival finish lines. Therefore, taking a good impression in the preparation margin is a necessary precondition to achieve a good marginal adaptation. Standardization and compliance with workflow protocols can reduce the number of repetitions and the need for corrections. In addition, the final success is strongly influenced by the clinical condition and is individual for each patient. Clinical parameters affecting the impressions are: periodontal status and oral hygiene of the patient, time period between preparation and taking impression, tooth preparation and anesthesia. The dentist has to be careful and to know how to identify them, and at the same time correct the potential complications that will affect the final prosthesis. The most common mistakes that occur during the process of taking impression are: inadequate marginal details, marginal tears, creating bubbles in the impression, selecting an inappropriate tray, separation from the tray, distorting the tray and surface contamination. Complications that arise in the process of taking impression are often confusing for the dentist and the dental technician. Of utmost importance for the ultimate success of prosthetic therapy is to know the possible causes of the failure and of course preventing them. By taking the necessary precautionary measures, damage to the impression will be avoided and we will have overall improvement in the fit of the final prosthetic construction. Keywords: impression errors, marginal adaptation, impression, fixed-prosthodontic appliances

Item Type: Article
Subjects: Medical and Health Sciences > Clinical medicine
Divisions: Faculty of Medical Science
Depositing User: Katerina Zlatanovska
Date Deposited: 05 Nov 2018 10:56
Last Modified: 05 Nov 2018 10:56

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