Comprative study the clinical outcomes of the Endocrowns and Conventional crowns fabricated by Computer Aided Design/Computer Aided Manufacturing (CAD/CAM): A Randomized clinical trial

Comprative study the clinical outcomes of the Endocrowns and Conventional crowns fabricated by CAD/CAM

In this Randomized Triple blinded Clinical trial study, 44 maxillary and mandibular teeth in need of crown reconstruction that have inclusion criteria and visit the prosthodontist's clinic in kermanshah are randomly assigned to intervention groups

Teeth in need of crown reconstruction are randomly divided into 2 intervention groups.clinical treatment is done by a prosthodontist with 10 years of work experience in a dental clinic.in each group the restorations are made of Lithium disilicate glass-ceramic and fabricated by CAD/CAM and inserted after the tooth preparation.then,teeth are followed for 6 months by another prosthodontist and a calibrated examiner based on CDA(California Dental Association) criteria.in this triple blinded study,only the prosthodontist who insert the restorations knows about the groups and participants,outcome evaluators and result analyst are blinded.

INCLUSION:1. Have the opposite teeth in functional occlusion and at least one proximal contact. 2. Acceptable oral hygiene and periodontally healthy. 3. Good general health. 4. No obvious signs or symptoms of bruxing and/or clenching. 5. The patient is ready to take part in the study and sign the testimonial. EXCLUSION:1. Presence of para-functional habits. 2. Presence of periodontal problems and dental or medical history that can complicate the preparation of the restoration. 3. The lack of cooperation of the patients to observe oral hygiene.

1-control group:conventional crowns fabricated by CAD/CAM. 2-Endocrowns fabricated by CAD/CAM

shade match,surface texture,marginal integrity,fracture,recurrent caries,retention,Wear,Antagonist Wear,Mobility,Pocket depth,Bleeding on probing,Gingival index,Plaque index

Based on the random allocation law, after determining 44 maxillary and mandibular molars based on statistical calculations, 22 cards for the Endocrown group and 22 cards for the Conventional crown group will be placed in a draw glass, then the cards will be dropped out randomly and without replacement and the resulting sequence will be recorded.Then,44 envelopes are prepared and each random sequence created is recorded on a card and the cards are inserted into the envelope respectively. In order to maintain a random sequence, the envelopes are numbered to the same. In the end, the door covers are enclosed in boxes and placed in a box respectively. At the time of the start of the registration of the participants, according to the order of entry of qualified participants to study, one of the envelopes are opened in sequence and the participant's assigned group is revealed.

in this clinical trial study, only the prosthodontist who insert the crowns and endocrowns knows about the groups and the outcome evaluators(other prosthodontist and the calibrated examiner) are blind to the assignment of each participant in each of the study groups. Participants in the study are blind toward their own group when they are aware of the similar costs and benefits of clinical treatments based on studies. Also the result analyst, have no information about the data of each group.It should be mentioned as the restorations have no differences in appearance after insertion,triple blinding is available.