Intraoral Occlusal Adjustment Time and Volume Required for Single Unit Fixed Prosthesis Fabricated With Different Virtual Articulator Mounting Methods (a Randomized Controlled Clinical Trial)
试验速览
- 阶段
- 不适用
- 状态
- 已完成
- 入组人数
- 33
- 试验地点
- 1
- 主要终点
- Clinical Occlusal Adjustment Time
研究概览
简要总结
Regardless of the fabrication workflow occlusal adjustments seem to be inevitable during delivery of indirect fabrication of the restoration. This has been attributed to snowballing of discrepancies due to multiple procedures for information transfer between the clinician and the laboratory. Current digital workflows minimize these discrepancies due to digital acquisition technology which eliminates drawbacks from physical materials which would alter the dimensions and morphology of the final restoration. Utilizing 3D face scanning technology is by far the least invasive and the least time consuming of available virtual facebow techniques and thus it's utilization could offer the benefit of saving time during occlusal adjustment and enhanced strength of the restoration by not subjecting it to the heat generation and subsequent crack initiation which occurs during occlusal adjustment. This study aims to compare the effect of a face scan to alignment of the maxillary cast on the volume and time of occlusal adjustment compared to conventional articulator digitization to align the maxillary cast.
详细描述
This study will be carried out on participants enrolled at the outpatient fixed prosthodontics clinic, Faculty of Dentistry, Cairo University.
Digital face scanning technology has made it possible to align the maxillary cast in a virtual articulator to represent a more accurate relationship to the terminal hinge axis of the patient than average positioning on a virtual Bonwill triangle. This would be reflected on the occlusal design of the restoration and subsequently on the amount of adjustment needed to the occlusal surface of the restoration during delivery. Decreasing the amount and time of occlusal adjustment would result in a decrease in chair time, increase in the longevity of the restoration and enhanced esthetics of the restoration.
Conventional alignment and mounting of casts to simulate the patients' dynamic occlusions remains the gold standard to which newer digital cast alignment and relation technology is to be compared. Thus the selection of the articulator scan as the comparator was made
Participants' Timeline
Clinical Visit 1 Preoperative records Clinical examination, Radiographic examination, Assessment of inclusion, Informed consent, Intraoral photographs, Primary impression (irreversible hydrocolloid) for diagnostic cast fabrication.
研究设计
- 研究类型
- Interventional
- 分配方式
- Randomized
- 干预模型
- Crossover
- 主要目的
- Treatment
- 盲法
- Triple (Participant, Investigator, Outcomes Assessor)
盲法说明
All conventional and digital mounting procedures will be performed with all trial participants and the allocation will occur as to which mounting procedure will be utilized in the designing of the crown. Sequence allocation will be performed using a random sequence generated by an impartial third party who will assign an equal number of participants to each mounting condition. This allocation will be shared with the laboratory technician but not the main investigator as he will be performing the outcomes assessments.
入排标准
- 年龄范围
- 21 Years 至 70 Years（Adult, Older Adult）
- 性别
- All
- 接受健康志愿者
- 是
入选标准
- •Be aged 21-70 years old, be able to read and sign the informed consent document.
- •Psychologically and physically able to withstand conventional dental procedures.
- •Participants with molars indicated for full coverage restorations
- •Large carious lesions
- •Teeth restored with large restorations
- •Endodontically treated teeth
- •Accept to undergo face scanning and articulator mounting procedures
- •Have no active periodontal or pulpal diseases, have teeth with clinically acceptable restorations.
- •Able to attend punctually for preplanned visits and evaluation.
排除标准
- •Participants with active resistant periodontal diseases.
- •Participants with poor oral hygiene, high caries risk and uncooperative participants.
- •Pregnant women.
- •Participants in the growth stage with partially erupted teeth.
- •Psychiatric problems or unrealistic expectations.
- •Lack of opposing dentition in the area of interest.
- •Restored occlusal surface opposing the planned restoration.
- •The presence of a removable or fixed orthodontic appliance.
- •Signs of bruxism or clenching
研究组 & 干预措施
Digitized Mounted Articulator Scan
Conventional articulator facebow mounting will be digitized using extraoral digital 3d scanner and used to position the maxillary cast on the virtual articulator.
This positioning will be utilized during design of the occlusal surface of the restoration.
干预措施: Digitized Mounted Articulator Scan (Procedure)
Average Positioning on Virtual Bonwill Triangle
Virtual Bonwill triangle will be used to position the maxillary cast on the virtual articulator.
This positioning will be utilized during design of the occlusal surface of the restoration.
干预措施: Average Positioning on Virtual Bonwill Triangle (Procedure)
Digital Face Scan
Digital face scan will be used to position the maxillary cast on the virtual articulator.
This positioning will be utilized during design of the occlusal surface of the restoration.
干预措施: Digital Face Scan (Procedure)
结局指标
主要结局
Clinical Occlusal Adjustment Time
时间窗: Immediately after verification of restoration acceptability but prior to occlusal adjustment. Time will be measured until occlusal contacts of the crown have been harmonized during the delivery clinical visit.
Time taken to harmonize occlusal contacts with participants masticatory function during delivery of the crown.Measured in minutes and seconds.
次要结局
- Volume of Occlusal Adjustment(Before and immediately after the occlusal adjustment. Volume before occlusal adjustment - volume after occlusal adjustment of the of the crown = volume difference)
研究者
Aly Ayman Mohamed El-Kady
Assistant Lecturer of fixed prosthodontics
Cairo University