Posterior CAD/CAM Cobalt-chromium Alloy Single Crowns: 4-year Prospective Clinical Study (NCT02956174) | Clinical Trial Compass
CompletedNot Applicable
Posterior CAD/CAM Cobalt-chromium Alloy Single Crowns: 4-year Prospective Clinical Study
89 participantsStarted 2012-05
Plain-language summary
Objectives - To evaluate the 4-year clinical outcomes of ceramic veneered Computer Aided Design/Computer Aided Manufacturing (CAD/CAM) Co-Cr single crowns supported by natural teeth in posterior regions.
Material and methods - Eighty-nine patients were provided with 120 ceramic veneered CAD/CAM Co-Cr single crowns replacing either premolars and molars. Specific inclusion criteria were needed and tooth preparations were standardized and performed by 2 expert prosthodontists. CAD/CAM Co-Cr frameworks were fabricated and veneered with ceramics. The restorations were cemented using a eugenol-free zinc oxide luting agent. The patients were recalled after 1, 6, 12, 24, 36 and 48 months. The survival and success of the restorations were evaluated. The technical and esthetic outcomes were examined using the United States Public Health Service criteria. The biologic outcomes were analyzed at abutment and contralateral teeth and descriptive statistics were performed.
Who can participate
Age range
21 Years – 68 Years
Sex
ALL
See this in plain English?
AI-rewrites the medical criteria so a patient or caregiver can understand them. Always confirm with the trial site.
Inclusion criteria:
* good general health
* American Society of Anesthesiologists (ASA) ASA I or ASA II condition; periodontal health
* Angle class I occlusal relationship
* minimum of 10 couples of opponent teeth
* good oral hygiene
* no evident signs of parafunctions and/or temporomandibular disorders.
* periodontal health of abutment teeth (absence of tooth mobility, absence of furcation involvement);
* proper positioning of abutment teeth in the dental arch (tooth axis adequate for a SC)
* sufficient occlusal-cervical height of the clinical crown of abutment teeth (≥ 4 mm) for the retention of a SC
* vital or endodontically treated to a clinically sound state abutment teeth;
* abutment teeth opposing natural teeth.
Exclusion criteria:
* high caries activity
* presence of periodontal disease on the abutment tooth
* occlusal-cervical height of the abutment tooth \< 4 mm
* reduced interocclusal distance or supraerupted opposing teeth
* unfavorable crown-to-root ratio
* severe were facets, clenching and/or bruxism
* presence of removable partial dentures (RPDs)
* pregnancy or lactation
* alcohol and/or drug addiction
Questions worth asking your doctor
Bring these to your next appointment. They're a starting point for a shared conversation — not a sign you qualify or a recommendation to enrol.
1Based on my diagnosis and history, is this trial worth exploring for me — or is there a standard treatment we should try first?
2What does this trial's phase tell us about how much is already known about its safety and benefit?
3What would taking part actually involve for me — visits, tests, time, and travel?
4What are the known and possible risks or side effects I should weigh, and how would they be monitored?
5If this trial isn't the right fit, what other options or trials would you suggest I look into?
Generated to help you prepare — always confirm anything about your own eligibility and care with the study team and your doctor.
Questions for the trial coordinator
The trial coordinator is the person who runs the study day to day. These cover the practical side — logistics, costs, and what taking part would actually mean for your life. The study team confirms whether you meet the criteria; these are questions to ask, not a sign you qualify.
1What does taking part actually involve week to week — how many visits, where, and how long does each one take?
2What costs are covered by the study, and what might I have to pay for myself, including travel, parking, or time off work?
3What happens during screening, and what happens if the study team confirms I don't meet the criteria after those tests?
4Who pays for the scans, blood work, and other tests the trial requires — the study, my insurance, or me?
5How will being in the trial affect my regular care, and will my own doctor stay informed and involved?
6Can I leave the trial at any point if I change my mind, and what would happen to my care if I do?
A starting point for the conversation — always confirm anything about your own eligibility, costs, and care with the study team and your doctor.