severe wear of teeth to be restored K02.1 K02.2 K02.3 K02.4 K02.5 K02.8 K02.9
Conditions
Interventions
Group 1: Lithiumdisilicate is one of the gold standard materials for posterior crown restorations (according to the German S3 Guideline for Crowns and Bridges)
Group 2: monolithic zirconia crowns
Sponsors
Uniklinik RWTH Aachen Klinik für Zahnärztliche Prothetik und Biomaterialien
Eligibility
Sex/Gender
All
Age
18 Years to No maximum
Inclusion criteria
Inclusion criteria: 1. Due to the fact that the preparations for the study crowns are not different from other crown indications already prepared teeth can be included. 2. The participants of the study must be adult and growth must be completed. Written informed consent must be available. 3. Indication for posterior crown(s) or partial crown. 4. Natural teeth or fixed partial dentures / fixed restorations as antagonists. 5. High probability that the antagonist material stays in situ for at least three years. 6. Within in the study a maximum of two crowns (one zirconia and one lithiumdisilicate) and at least one partial crown made of zirconia can be inserted. 7. No general dental complaints 8. No periodontal treatment needs. Absence of periodontal diseases are characterized by: pocket depths > 3mm, affection of furcation, tooth loosening. Does a patient not fulfill the requirements the monitor or the quality assurance makes a decision if the patient can be included after certain pretreatments. 9. Sufficient oral hygiene: Threshold is the Sulcus Bleeding Index (SBI) of 70%. 10. Within the first four years there should not be the need of comprehensive treatments beside the study teeth. 11. The patient should be able to attend probably the recall appointments.
Exclusion criteria
Exclusion criteria: 1. Patients exhibiting signs of TMDs (temporo mandibular disorders) including pathological signs in static and dynamic occlusion. 2. Teeth with pathological signs (sensitivity, periodontal status). 3. Insufficient oral hygiene. 4. Adverse general health conditions. 5. Pregnancy and breast-feeding patients 6. Bruxism is no contra-indication. 7. Minors 8. Consent inability.
Design outcomes
Primary
| Measure | Time frame |
|---|---|
| survival rate of the monolithic restoratiions in comparison with existing standard restorations | — |
Secondary
| Measure | Time frame |
|---|---|
| a) The marginal fit of the lithiumdisilicate and zironia crowns do not differ more than 50 µm exhibiting a standarddviation more than 40 µm. b) The marginal fit of the partial crowns does not differ in the same range compared to the monolithic crowns. c) The antagonist wear caused by the restorations does not differ dependent from the material used within the study. d) The lithium disilicate crowns and the monolithic zirconia crowns do not differ significantly with respect to shape and esthetics. e) Evaluation of the temporary cement with respect to retention and sensitivity. | — |
Countries
Germany
Contacts
Public ContactSven Reich
Uniklinik Aaachen Lehr- und Forschungsgebiet Computergestützte Zahnmedizin in der Klinik für Zahnärztliche Prothetik und Biomaterialien, Zentrum für Implantologie
Outcome results
None listed