Evaluation of the quality of fixed prosthesis impressions in private laboratories in a sample from Yemen

Abstract

Background Fixed prosthodontics require an accurate impression for the teeth and the area to be restored for the laboratory to fabricate the desired restoration without mistakes. This study evaluated the quality of impressions received by private laboratories for the fabrication of fixed prosthesis by describing the frequency of clinically detectable errors and by analyzing association between the various factors involved. Methods 165 impressions were collected from four dental laboratories. Jaw involved, type of tray, size of tray, number of prepared units, type of impression materials, techniques and viscosity in case of elastomeric impressions and type of prosthesis requested were recorded. Data referring to errors and visible defects including errors in finish line, in preparation area, in silicone impression technique and blood in impression were also documented. Factors affecting errors present were also assessed. Association between dentist gender and experience years and impression errors was assessed. Chi square and Fisher exact tests used to examine the association between categorical variables and outcomes. Results The total of error considering not immediately pouring as an error. Alginate was the most impression used. of impressions evaluated (50.9%), 97% were have at least one visible error; 92.1% had errors in finish line, 53.9% had errors in preparation area and (72.8%) of elastomeric impressions were have at least one error in technique. Blood in impression was detected in 52.1% of impressions. Significant association was found between material type and errors in finishing line and preparation area. Significant relationships were found between gender and errors in silicone impression technique (p < 0.05). Conclusion Within the limitations of this study, high frequency of detectable errors was found in fixed prosthesis impressions received by private dental laboratories. This high frequency is of serious concern, as this will result in poor fitted fixed prosthesis provided to patients.

Characteristics of Periodontal Tissues in Prosthetic Treatment with Fixed Dental Prostheses

“…The unrestored edentulous space and alveolar ridges may lead to several significant changes, such as the impairment of biomechanics in the dentofacial system, poor aesthetic, deterioration of periodontal tissues, and negative effects on the general health and social behaviors of the patient [ 2 ]. There are various methods of restoration of partially edentulous patients, and the fixed dental prostheses fabricated using metal alloys and porcelain are one of the common methods for the restoration of missing teeth [ 3 , 4 ].…”

The accuracy of gypsum casts obtained from the disinfected extended-pour alginate impressions through prolonged storage times

“…Accuracy of these impressions is required to reproduce dental cast almost have the same dimensions and details of the oral structures [ 1 , 2 ]. In spite of the ease of material’s manipulation, alginate impressions usually encounter some dimensional changes in response to their polysaccharide nature [ 5 ]. This structure makes these materials regularly subject to fluid gain and loss in inherited phenomena known as imbibition and syneresis [ 7 ].…”

“…Regardless the modern digital approaches, regular dental impressions are still the most reliable method to obtain gypsum casts with an acceptable degree of precision [ 3 , 4 ]. The cost effective and easily manipulated irreversible hydrocolloids are one of the most frequently used impression materials in everyday dental practice [ 5 , 6 ]. However, the dimensional instability in response to the syneresis and imbibition phenomena is considered the main drawback of the conventional version of the alginates [ 7 ].…”

Fixed Prosthetic Restorations and Periodontal Health: A Narrative Review

“…A delay in prosthetic treatment causes biomechanical impairment of the stomatognathic system, worsening of the periodontal condition, and adverse consequences on the patients’ general health and behavior [ 9 , 10 , 11 , 12 ]. Prosthetic treatment receives special attention in the case of patients with periodontal pathology [ 13 , 14 ]. However, sometimes, inappropriate prosthetic treatment planning or the prosthesis itself can cause periodontitis or gingival recession and associated clinical characteristics ( Figure 1 ).…”