Objectives: To evaluate the handling and performance of a new single-unit light-cured composite posterior temporary crown (ProtempTM Crown, 3M ESPE, St Paul, MN, USA) in general dental practice in the UK.
Methods: After Ethical Approval, a supply of the nine sizes and forms (molar, pre-molar and canine) of the temporary crowns were supplied to three general dental practitioners (GDPs) with practices in Coleraine, Liverpool and Shrewsbury for use over a period of one year. A baseline questionnaire was completed by the clinician, recording tooth sensitivity, crown preparation form, contact tightness, and (using modified Ryge criteria) the marginal adaptation and anatomic form of the crown, together with information on the clinician's previously used temporisation technique. The adjacent gingival status and ease of placement was also noted. At the permanent crown fit appointment these criteria were re-scored, in addition to information regarding re-cementation or loss of the temporary crown.
Results: Prior to using the product under evaluation, an alginate impression and a self-cure bis-acrylic based temporary crown material technique was used by all the clinicians.. 59 temporary crowns in 53 patients were in place for an average of 13.9days (Range 2-40 days). Eight crowns (14%) were lost and four crowns (7%) were recemented. Other results (with percentage optimal scores) were as tabulated below:
Criteria | Baseline | Fit Appointment |
Marginal adaptation | 42% | 48% |
Anatomic form | 46% | 36% |
Proximal contact | 48% | 54% |
Gingival status | 83% | 69% |
The clinicians stated that on average 38% (range 3 – 60%) showed some staining, with just one GDP reporting comment from patients.
Conclusion: The new temporary crowns performed satisfactorily in UK general practice.
The support of 3M ESPE, St Paul, MN, USA is acknowledged