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A randomized controlled clinical trial of two types of lithium disilicate partial crowns
Edoardo Ferrari Cagidiaco1,2, Roberto Sorrentino3, Denise Ik Pontoriero1,4
1Department of Prosthodontics and Dental Materials, University of Siena, Siena, Italy.
Purpose:
This randomized controlled clinical trial evaluated the behavior of lithium disilicate partial crowns by means of a novel Functional Index for Teeth (FIT).
Methods:
105 subjects in need of at least a single prosthetic restoration in posterior areas were treated with adhesive partial crowns (for a total of 170 restorations) onto natural vital abutment teeth and followed-up annually for 4 years. Subjects were randomly divided into two experimental groups: Group 1, e.max Press and Group 2, Initial LiSi Press. FIT was used for the objective assessment of outcomes including clinical and radiographic examinations. A dropout rate of 4.25% in Group 1 and 3.4% in Group 2 was recorded. FIT is made up of seven variables (interproximal, occlusion, design, mucosa, bone, biology and margins); each of them to be evaluated using a 0-1-2 score. The Mann-Whitney U test was applied for statistical analysis and the level of significance was set at P< 0.05.
Results:
In Group 1, five complications were recorded, and four in Group 2, with a failure rate of 6.25% and 6.17%, respectively. No statistically significant difference was found between the experimental groups in any of the assessed variables. The tested lithium disilicate material brands showed comparable clinical performances after 4 years of clinical service.
Clinical Significance:
Clinicians can use either of the tested lithium disilicate materials to make adhesively luted partial crowns.
