NIPH Clinical Trials Search

JRCT ID: jRCTs062210076

Registered date:17/02/2022

PEEK crown for the last molar teeth

Basic Information

Recruitment status Recruiting
Health condition(s) or Problem(s) studiedCaries of molar tooth
Date of first enrollment01/07/2022
Target sample size30
Countries of recruitment
Study typeInterventional
Intervention(s)Tooth preparation: insurance publication in the future, abutment construction is resin core or the metal core with the silver alloy (in the case of metal allergy, no use the metal core, use the resin core).Crown making with PEEK materials, in order of the design with the scanner, a design by the CAD and cutting by CAM.Intra oral trial and proper adjustment: after adjustment in oral cavity, polishing crown.After alumina sand blast process to inner surface of the crown, setting with adhesive resin cement.


Primary OutcomePresence or absence of falling or fracture of crown, at the time of one month, three and six months after setting PEEK crown.
Secondary OutcomeOne month, three and six months after setting PEEK crown, crack of crown, condition of occlusal contact, pain, pain, secondary caries, condition of occlusal surface of crown, change in occlusal surface condition by model, dislocated crown color, attached dental plaque, condition of marginal gingiva, occlusal surface of antagonistic teeth, interproximal contact, necessity of retreatment, bite force and recovery of masticatory ability, satisfaction of the patient.

Key inclusion & exclusion criteria

Age minimum>= 20age old
Age maximumNot applicable
Include criteriaAt the time of the agreement, patient of 20 years or older. Upper or lower molar, sing le crown (connected two crowns, possible), antagonistic teeth are necessary (natural teeth or crowns restoration material, including bridges, excluding removable dentures). About 3mm height of abutment tooth can be secured after tooth preparation. Document agreement can be obtained for the participation in this study.
Exclude criteriaAbutment tooth of the partial denture. The target tooth and the opposing teeth have severe periodontal disease (pockets more than 6mm, bone resorption, attachment loss more than tooth root long 1/2 more than furcation involvement 2 degrees). When root canal treatment is required due to severe caries, etc. Patients with a history of hypersensitivity such as rash or dermatitis to this material or (meth)acrylic acid monomer. Inappropriate though a study partaker or member (of a research project) carried out this study.

Related Information


Public contact
Name Hitoshi Abekura
Address 1-2-3 Kasumi, Minami-ku, Hiroshima 734-8551,Japan Hiroshima Japan 734-8551
Telephone +81-82-257-5677
Affiliation Hiroshima University Hospital
Scientific contact
Name Kazuhiro Tsuga
Address 1-2-3 Kasumi, Minami-ku, Hiroshima 734-8551, Japan Hiroshima Japan 734-8551
Telephone +81-82-257-5677
Affiliation Hiroshima University Hospital