American College of Prosthodontists

Title: Perception of prosthodontic residents and dental students on esthetic outcome of all-ceramic single crowns.

Authors: Yu Chun Lin, DDS*; Ramtin Sadid-Zadeh, DDS, MS; Rui Li, DDS, PhD

Purpose: The aim of this study was to assess prosthodontic residents’ perception on esthetics outcome of a single crown fabricated from monolithic and layered zirconia, and monolithic lithium disilicate.

Materials and Methods

One maxillary right central incisor crown on a typodont was fabricated using layered pressed lithium disilicate (IPS. e.max; IvoclarVivadent) by an experienced lab technician to match the central incisor of a patient. Subsequently, thirty maxillary left central incisor crowns were designed and fabricated on standard typodont tooth preparations by commercial lab using three different materials, each 10: 1) monolithic zirconia; 2) layered zirconia (ZirCAD Prime; B1) and 3) monolithic lithium disilicate (IPS. e.max CAD MT, B1). Under the single-blind setting, three dental students and three prosthodontic residents participated in the visual shade match. Under natural sunlight, the esthetic outcome was assessed by overall, cervical, middle and incisal shade match of above-mentioned crowns to maxillary right central incisor. Statistical differences between groups were analyzed using one-way ANOVA and multiple t test.

Results:

1.The overall esthetic outcomes revealed that the layered zirconia group demonstrated significant better shade match to the existing lithiumdisilicatecrown (76.67%). The monolithic zirconia group (23.33%) performed slightly better than lithium disilicate group (16.67%), but was statistical insignificant.

2.Layeredzirconia group showed high shade match rate (76.67%) in both dental students and prosthodontic residents group. In lithium disilicate group, dental students reported slightly better shade match (26.67%) than prosthodontic residents (6.67%). In monolithic zirconia group, prosthodontic residents (10.00%) reported slightly better shade match than dental students (6.67%)

3.In middle third of the crown, layered zirconia exhibited significantly better shade match performance than monolithic zirconia group (10.00%) and lithium disilicate group (8.33%).

4.In incisal and cervical portion of the crown, layered zirconia demonstrated better shade match performance than monolithic zirconia group and lithium disilicategroup,

5.In cervical portion of the crown, both monolithic zirconia and lithium disilicate group showed better shade match performance than in incisal portion of the crown.

Conclusions:

1.The overall shade match performance revealed that the LZ group demonstrated significant better shade match to the existing layered lithium disilicate crown.

2.There is a significant better match rate among different type of restorations in middle third.

American College of Prosthodontists - 2020 ANNUAL SESSION

Perception of Prosthodontic Residents on Esthetic Outcome of All-Ceramic Single Crown

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