Wear Characteristics and Clinical Performance of Lithium Silicate Versus Monolithic Zirconia Crowns. (Randomized Controlled Clinical Trial)
试验速览
- 阶段
- 不适用
- 入组人数
- 22
- 试验地点
- 2
- 主要终点
- color matching
研究概览
简要总结
The aim of the present study is to evaluate the wear characteristics and clinical performance of lithium silicate crowns in comparison to monolithic zirconia crowns.
The quality of the overall restorations as well as gingival tissues will be also evaluated according to modified United States Public Health Service (USPHS) criteria: (Marginal adaptation, color match, anatomic form, integrity of restoration, secondary caries, retention, tooth sensitivity, gingival index and periodontal index) at baseline, 6 months and 1 year
详细描述
Recently advances in ceramics have greatly improved the mechanical and optical properties of restorative materials to overcome the drawbacks of all ceramic restorations over decades such as fracture, chipping, crack, wear and delamination of veneer ceramics.
Up to date despite the popularity of all ceramic restoration, the clinicians have been worried about the wear of tooth enamel antagonist to ceramic materials.
The wear properties of the ceramic restoration can affect the rate of wear of the antagonist enamel. So the wear resistance of ceramic restoration must be the same as enamel.
Explanation for choice of the comparator:
Monolithic zirconia attracts many dentists worldwide due to its excellent mechanical properties, biocompatibility and appreciate aesthetics. Some in vivo studies demonstrated the clinical success of monolithic zirconia restorations as an antagonist to natural enamel with good marginal adaptation, accepted contour, occlusion and minimum gingival response.
研究设计
- 研究类型
- Interventional
- 分配方式
- Randomized
- 干预模型
- Parallel
- 主要目的
- Treatment
- 盲法
- Double (Participant, Outcomes Assessor)
入排标准
- 年龄范围
- 21 Years 至 50 Years（Adult）
- 性别
- All
- 接受健康志愿者
- 是
入选标准
- •All subjects are required to be:
- •Age range of the patients from 21-50 years old; able to read and sign the informed consent document, illiterate patient will be avoided.
- •Patients able physically and psychologically to tolerate conventional restorative procedures.
- •Patients with no active periodontal or pulpal diseases, having teeth with good restorations.
- •Patients with teeth problems indicated for full coverage restoration (e.g. moderate to severe discoloration, coronal fracture where partial coverage would lack retention, malposed or malformed teeth).
- •Patients with root canal treated teeth requiring full coverage restorations.
- •Presence of an opposing natural tooth which is non-restored or minimally restored. (Minimally restored is defined as teeth which have no restoration greater than a Class II a restoration)
- •The opposing arch doesn't have a full coverage restoration or a partial denture.
- •Patients willing to return for follow-up examinations and evaluation.
排除标准
- •Patients with poor oral hygiene.
- •Patients with psychiatric problems or unrealistic expectation (patient that has phobia from dental treatments or needle bunch).
- •Patients have no opposite occluding dentition in the area intended for restoration
- •Patients suffer from Para functional habits or temporomandibular disorders. (as those patient may have wear which will affect the results)
研究组 & 干预措施
monolithic zirconia crowns
Monolithic zirconia attracts many dentists worldwide due to its excellent mechanical properties, biocompatibility and appreciate aesthetics
干预措施: monolithic zirconia crowns (Other)
lithium silicate crowns
A lithium silicate glass ceramic is newly introduced to the market. After crystallization, it exhibits an ideal combination of aesthetics and strength with translucency that mirrors the vitality of natural teeth for fabrication of full anatomic anterior and posterior crowns.
干预措施: lithium silicate crowns (Other)
结局指标
主要结局
color matching
时间窗: 12 month
Color match of the two groups will assessed using the modified United States public health service (USPHS) criteria as follows: * Alpha (Excellent) ideal. * Bravo (Acceptable) less than ideal but no modifications required * Charlie (Acceptable but modifications needed) staining or other shade modifications required. * Delta (Unacceptable) remake.
Wear of all ceramic crowns and color matching
时间窗: 12 month
(Wear of ceramic crowns) of the two groups will be assessed using the 3D optical profilometer.
次要结局
- Wear of enamel antagonist to all ceramic crowns(12 month)
- Marginal adaptation(12 month)
- periodontal condition(12 month)
- anatomic form(12 month)
- gingival condition(12 month)
- integrity of restoration(12 month)
- secondary caries(12 month)
- retention(12 month)
- opposing tooth sensitivity(12 month)
研究者
Rasmia Mamdouh Ali Salem
principal investigator
Cairo University