Clinical Outcomes of Premolars Restored with Ceramic Vonlay Restorations versus Onlay Using Modified USPHS Criteria(Randomized Clinical Trial)

Abstract

Statement of the problem:For restoring maxillary premolars,onlay restorations are used to restore large areas of decay, but they cannot restore facial surface defects.Vonlay restorations, on the other hand, exhibit the benefits of onlays and veneers, resulting in a highly attractive and effective restoration.

Aim: Evaluate the clinical performance of premolars restored with ceramic vonlays versus onlays using modified USPHS criteria regarding fracture, marginal integrity, and marginal discoloration.

Methodology:26 partial coverage restorations for vital premolar teeth were constructed from pressable lithium disilicate ceramic material. According to the preparation designs, premolar teeth were divided into two groups. Group l: (complete onlay preparation design) and Group 2: (vonlay preparation design). It was cemented with dual cure-adhesive resin cement. Immediately following cementation, fracture, marginal integrity, and marginal discoloration were evaluated using modified USPHS restoration clinical assessment guidelines. After three, six, nine, and twelve months, respectively, these measurements were repeated.

Results:The clinical performance of maxillary premolars regarding (fracture, marginal integrity and marginal discoloration) over one year, there was no statistically significant difference between the two groups.

Conclusions: Maxillary premolars restored with both complete onlay and vonlay designs using pressable lithium disilicate ceramic material demonstrated successful clinical performance in terms of fracture resistance, marginal integrity, and marginal discoloration over a one-year period.