Evaluation Of The Related Factors Influencing The Early Stability Of Dental Implants

With the development of oral medicine, implant dentistry has become a very popular solution to remediate the loss of teeth and dental rehabilitation. For the last few decades, the immediate loading protocol have become more and more popular because the increasing demands of shortened treatment time. Implant stability is considered one of the most important parameters in implant dentistry. It affects the healing and successful osseointegration of implants. For any implant procedure, successful implant integration is a prerequisite criterion, which depends on a series of procedure-related and patient-dependent factors. It also has been considered that preoperative measurement is critical and may give valuable information to predict loading time and survival of the implants.In this clinical study, the samples were collected from patients with single teeth missing who came from the department of prosthodontics from the School of Stomatology of the Fourth Military Medical University. Firstly, the prospective cohort study was used to investigate the correlation between different factors and the early stability of the implants. And then, using the correlation between different factors and the early implant stability gives predictable data about implant stability and then evaluate the accuracy and reliability.Part I Clinical study to evaluate the related factors influencing the early stability[Objective ] To evaluate the factors that influence the early stability of dental implants.[Methods] 106 single teeth missing consecutive patients requiring implant treatment were consented to participate in this study, Nobel ReplaceTM Tapered implants were delivered to these patients. Measure the preoperative bone density of the implant locations by CBCT. Implant stability quotient(ISQ) was tested by Osstell? Mentor on the day of surgery and the 12 th weeks. Measure the thickness of the bone around the implant by CBCT. Measure the crestal bone resorption by X-ray images. All datas were analyzed using SPSS19.0 software package.[Results] All the 106 implants achieved good primary stability at surgery(68.07±10.31). ISQ was statistically significant higher at the 12 th weeks(P<0.05). Statistically significant differences was found between implant insertion sites, bone density(HU values) and implant widths(P<0.05). There was no significant difference between the thickness of the bone around the implant, crestal bone resorption and implant lengths.[Conclusion] Implant stability seems to be affected by implant insertion sites, bone density and implant widths. More evidence should be supported the influence of the thickness of the bone around the implant, crestal bone resorption and implant lengths on implant stability.Part II Clinical study to predict the early implant stability using CBCT[Objective ] To investigate the feasibility of using CBCT HU value to predict early implant stability.[Methods] 20 single teeth missing consecutive patients requiring implant treatment consented to participate in this study. The implant sites were in the mandibular molar region(10 implants) and maxillary molar region(10 implants). Measure the preoperative bone density of the implant locations by CBCT. Calculate the predicted ISQ values by the linear regression equation. Nobel ReplaceTM Tapered implants were delivered to these patients. ISQ value was tested by Osstell? Mentor on the day of surgery and the 12 th weeks. Spearman’s rank correlation coefficient was used to investigate the correlation between the predicted values and the measured values.[Results] Statistical significant correlation were found between the predicted values and the measured ISQ values(P<0.05).[Conclusion] Under the conditions of this study, preoperative CTBT may enable the prediction of the early implant stability.