Milled in Versus Round Bar for Mini-implant Retained Mandibular Overdentures :A8 Year Retrospective Study of Peri-implant Bone Changes and Posterior Ridge Resorption
试验速览
- 阶段
- 不适用
- 状态
- 已完成
- 入组人数
- 18
- 主要终点
- posterior ridge resorption
研究概览
简要总结
purpose: The primary purpose of this retrospective radiographic study were conducted to compare between milled bar and round bar for mini implant retained overdentures (IODs) on peri-implant bone changes and posterior mandibular ridge resorption .Study Design: A convenience sample of 18 completely edentulous participants were selected for this retrospective study from patients originally available at the start of the trial .
The null hypothesis was that there were no significant difference between milled in and round bar attachment retained implant supported overdentures in posterior ridge resorption and peri-implant bone changes.
详细描述
Study Design:
A convenience sample of 18 completely edentulous participants were selected for this retrospective study from patients originally available at the start of the trial. The patients were informed about the study objectives and they were signed an informed consent and the protocol were approved by the Ethical Committee, Faculty of Dentistry, Mansoura University.
The patients were equally divided into two groups at the start of the trial. The patients (average age 45-60 years) were selected for this study from outpatient clinic of Removable Prosthodontics Department, Faculty of Dentistry, Mansoura University.
Patients' criteria:
Completely edentulous maxillary and mandibular residual alveolar ridges covered with healthy mucosa without any remaining roots or local inflammation as detected by digital panoramic x-ray and clinical examination.. Anterior mandibular bone length was sufficient to allow proper implant placement as assessed by digital panoramic radiograph. Patients were of class I Angel's maxillo-mandibular relation with at least 22mm of restorative space allow for bar construction as detected by tentative jaw relation, and good bone quality (classes 1 to 3 according to Lekholm and Zarb). Participants with diabetes mellitus, osteoporosis, immunological dysfunction, anticoagulant medication, radiation to the head and neck region, smoking habits ,and systemic diseases that interfere with implants osseointegration were excluded from the study .For each patient, overdentures assisted by four splinted mini dental implants According to type of bar attachment used for splinting the four MDIs, patients were divided into two equal groups where: Group I: Received milled-in bar and Group II: Received round bar joint attachment. O-Ball impression copings were snapped directly onto each O-Ball MDI Implant. A Pick-Up closed tray impression technique was made using polyether impression material. MDI Lab Analog was pressed into the coping until a snap fit was observed .The impression was poured into dental stone to form a stone model for scanning Bar construction
研究设计
- 研究类型
- Interventional
- 分配方式
- Randomized
- 干预模型
- Parallel
- 主要目的
- Other
- 盲法
- Single (Investigator)
入排标准
- 年龄范围
- 45 Years 至 60 Years（Adult）
- 性别
- All
- 接受健康志愿者
- 否
入选标准
- •Completely edentulous maxillary and mandibular residual alveolar ridges covered with healthy mucosa without any remaining roots or local inflammation as detected by digital panoramic x-ray and clinical examination.. Anterior mandibular bone length was sufficient to allow proper implant placement as assessed by digital panoramic radiograph. Patients were of class I Angel's maxillo-mandibular relation with at least 22mm of restorative space allow for bar construction as detected by tentative jaw relation, and good bone quality (classes 1 to 3 according to Lekholm and Zarb).
排除标准
- •Participants with diabetes mellitus, osteoporosis, immunological dysfunction, anticoagulant medication, radiation to the head and neck region, smoking habits ,and systemic diseases that interfere with implants osseointegration were excluded from the study
研究组 & 干预措施
milled bar group
. O-Ball impression copings were snapped directly onto each O-Ball mini dental Implants. A Pick-Up closed tray impression technique was made using polyether impression material. MDI Lab Analog was pressed into the coping until a snap fit was observed .The impression was poured into dental stone to form a stone model for scanning
The cast was scanned using 3SHAPE TRIOS and the bar constructed throughout the production steps:
Step 1: Order Creation ,Step 2: scan the lab analog of MDI on the stone model scanned with D700 scanner. Step 3: CAD Designing (first select preparation in teeth view from canine to canine-click abutment button-choose restoration type (bar)-choose restoration material (wax) .Step 4: Sending to CAM for Manufacturing, Step 5: Manufacturing (cutting from disc of modeling wax).
干预措施: panoramic x-ray (Diagnostic Test)
round bar
Prefabricated plastic bar pattern (RHIN 83 OT BAR multi use) was pre scanned for standardization of all cases. After cast scanning the abutment copy was designed and again standardized for all MDI. The pre scanned bar was inserted over the copies. The same procedure for manufacturing was followed as that of milled -in bar.
The finished bar is brought to the patient's mouth, seated accurately. The denture is then tried, fitted and extensions adjusted in the usual manner. The denture fitting surface was; the hygienic space under the bar was blocked-out with wax.
plastic clip was adapted to their metal sleeve, adapted to the bar, the occlusion was checked and then they were picked-up using auto-polymerized acrylic resin while the patient was instructed to close lightly in centric occlusion. After finishing and polishing procedures, the mandibular denture was clinically remounted to adjust any interferences in the centric and eccentric the occlusal contacts.
干预措施: panoramic x-ray (Diagnostic Test)
结局指标
主要结局
posterior ridge resorption
时间窗: 8 year
for posterior area in mandible
peri-implant bone loss
时间窗: 8 year
For marginal alveolar bone changes, the distance between implant shoulder (A) and first bone to implant contact (B) indicated vertical bone level (DIB) in mm. Vertical bone loss (VBL) were calculated by subtracting DIB at (T8) from DIB at T0. Alveolar bone changes were measured mesially and distally. B. periapical x-ray were done immediately at insertion (T0) ,the second one (T3) Two panoramic radiographs were taken, one at time of insertion (T0) and the second one after 8 years following the insertion (T8). The reference points and lines were traced using AutoCAD 2018 software
次要结局
未报告次要终点