[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"health-studies-list:{\"conditionNormalized\":\"fixed-dental-prosthesis\",\"overallStatus\":[\"RECRUITING\",\"AVAILABLE\",\"NOT_YET_RECRUITING\"],\"orderBy\":\"LastUpdateSubmitDate:desc\",\"size\":25,\"offset\":0}":3,"health-study-condition:fixed-dental-prosthesis":27},{"pageToken":4,"total":5,"offset":6,"count":5,"results":7},null,1,0,[8],{"id":9,"slug":10,"hasResults":11,"nctId":12,"briefTitle":13,"officialTitle":13,"acronym":4,"eligibilityCriteria":14,"healthyVolunteers":15,"sex":16,"minAge":17,"maxAge":18,"enrollmentInfo":19,"targetDuration":4,"studyType":22,"phases":4,"briefSummary":23,"conditions":24,"keywords":28,"overallStatus":34,"whyStopped":4,"lastUpdateSubmitDate":35,"lastUpdatePostDateStruct":36,"startDateStruct":39,"completionDateStruct":41,"leadSponsor":43,"locationsCount":4},"100614479","evaluation-of-occlusal-adjustment-material-removal-on-monolithic-zirconia-blocks-an-in-vitro-study-100614479",false,"NCT07280130","Evaluation of Occlusal Adjustment Material Removal on Monolithic Zirconia Blocks: An In Vitro Study","Inclusion Criteria:\n\nGroup A: Forty fourth-year dental students who have completed preclinical courses in operative dentistry, complete denture prosthodontics, and fixed prosthodontics (Part I). They have little to no experience in adjusting zirconia.\n\nGroup B: Forty sixth-year dental interns. Each participant will be tested twice-once before and once near the end of their clinical training. A questionnaire will also record their prosthodontic clinical experience within the past year.\n\nGroup C: Forty licensed clinicians with 0-5 years of post-graduation experience (with practical experience in zirconia adjustment). A questionnaire will also document their clinical experience in prosthodontics.\n\nExclusion Criteria:\n\n* Acute upper-limb\u002Fhand injuries or postoperative recovery within the past 3 months that may affect grip strength or fine motor control.\n* Neuromuscular disorders or tremor\u002Fpostural control impairments (e.g., essential tremor, peripheral neuropathy, moderate to severe carpal tunnel syndrome) that prevent stable operation.\n* Uncorrected or inadequately corrected vision that does not meet the requirements for close-range tasks (e.g., inability to clearly see fine markings at a distance of 30-40 cm even with correction).\n* Inability to follow the metronome rhythm (100 beats per minute).",true,"ALL","20 Years","40 Years",{"count":20,"type":21},120,"ESTIMATED","OBSERVATIONAL","This study aims to improve understanding of the amount of tooth-replacement material removed during a single grinding \"stroke\" performed in the adjustment of a zirconia crown. Zirconia is a highly durable ceramic material commonly used for dental restorations, and accurate adjustment is essential for achieving proper occlusion. However, existing literature does not provide quantitative data regarding material removal per stroke during chairside adjustment, resulting in reliance on individual clinical experience.\n\nIn this study, standardized zirconia specimens will be prepared and assigned to three operator groups: dental students, dental interns, and experienced clinicians. Each participant will perform a controlled number of grinding strokes on the specimens using a commonly used dental grinding stone. Specimens will be scanned before and after grinding using a three-dimensional scanner to precisely quantify material removal.\n\nHypothesis\n\nThe hypotheses of this study are:\n\nEach grinding stroke results in a measurable and relatively consistent amount of zirconia material removal.\n\nExperienced clinicians demonstrate more controlled and predictable material removal per stroke compared with students and interns.",[25,26,27],"Dental Occlusion","Occlusal Wear of Teeth","Fixed Dental Prosthesis",[29,30,31,32,33],"occlusal adjustment","Monolithic zirconia","Material removal","Silicon carbide stone","3D scan registration","NOT_YET_RECRUITING","2025-12-23",{"date":37,"type":38},"2025-12-30","ACTUAL",{"date":40,"type":21},"2026-02-01",{"date":42,"type":21},"2027-12-31",{"name":44,"class":45},"National Taiwan University Hospital","OTHER"]