ABSTRACT
Statement of the Problem: Despite the low failure rate of dental implants, recognition of the risk factors can enhance the predictability of failure. Purpose: The aim of this study was to evaluate the risk factors for early implant failure
Materials and Method: This retrospective cohort study was conducted on two groups of patients, the patients with a failed implant before loading and those without a failed implant. Age, gender, implant type, implant surface, implant length, bone type, type of surgery [one- or two-stage] and immediate [fresh socket] or delayed placement of implant were the variables to be assessed in this study
Results: Out of the 1,093 evaluated implants, 73 cases [6.68%] failed in early stages. The two groups were significantly different in terms of implant surface, fresh socket placement, prophylactic use of antibiotics, and bone density [p< 0.05]. Age, gender, implant height, implant type [cylindrical or tapered] and one-stage or two-stage placement were not significantly different between the two groups [p> 0.05]
Conclusion: It seems that prophylactic antibiotic therapy, implant surface, bone density and placement in fresh extraction socket may contribute to dental implant failure
Subject(s)
Humans , Male , Female , Risk Factors , Retrospective Studies , Cohort Studies , Dental ImplantationABSTRACT
Objective: Anesthetic techniques like the Akinosi technique were introduced to surmount the problems of the conventional inferior alveolar nerve block [IANB] technique. This study aimed to compare the local anesthetic efficacy of IANB via the conventional and Akinosi techniques in patients presenting to the Maxillofacial Surgery Department of School of Dentistry, Shahid Beheshti University
Methods: This clinical trial was conducted on 80 candidates for bilateral extraction of mandibular molars. For each patient, local anesthesia was induced by IANB injection, which was done by the conventional technique in one side and by the Akinosi technique in the other side of the mouth. The allocation of technique to side was randomized. Time to anesthesia for the long buccal, lingual and inferior alveolar nerves [IAN], degree of pain during injection and tooth extraction and incidence of positive aspiration in the two techniques were evaluated and analyzed using Wilcoxon Signed Rank and Chi square tests
Results: The mean time to anesthesia for the IAN was 2.82 minutes in the conventional and 3.05 minutes for the Akinosi technique. These values were 1.47 and 1.55 minutes, respectively for the lingual nerve and 1.43 and 1.56 minutes, respectively for the long buccal nerve. Four patients in the Akinosi technique and 12 patients in the conventional technique had positive aspiration. During anesthetic injection with the Akinosi technique, 72.5% were pain free, 18.8% experienced mild, 5% experienced moderate and 3.8% experienced severe pain. These values in the conventional technique were 51.3%, 27.5%, 11.3% and 10%, respectively
Conclusion: Considering the lack of a significant difference between the success rate of conventional and Akinosi IANB techniques, Akinosi technique seems to be a suitable alternative to the conventional technique since it is less painful and has lower risk of positive aspiration
ABSTRACT
Oral and dental injuries commonly occur during oral and nasal intubation and comprise one third of lawsuits against anesthesiologists. This study sought to assess dental traumas [especially minor injuries like cracks] due to oral and nasal intubation and related risk factors. This observational prospective study was conducted on 60 patients [30 patients in the oral and 30 in the nasal intubation groups] during 2010-2011 in Taleghani Hospital in Tehran. Patients were examined using a disposable sterile clinical examination kit, a periodontal probe and a light curing unit. Maxillary central incisors had the highest incidence of new cracks [60% and 63.3% in the oral and nasal intubation groups, respectively]. Gender, BMI, ASA class, Angle's classification, and experience of the operator who inserted the tube had no significant association with higher frequency of cracks in the two groups. Incidence of visible dental injuries following nasal and oral intubation was 1.7% and 10%, respectively. Invisible dental injuries due to intubation are highly prevalent. These injuries are mostly disregarded by the anesthesiologists since they are not visible and do not cause any complication or problem during anesthesia. Enhancing the knowledge of anesthesiologists about dental anatomy, physiology and pathology and use of teeth-guard are necessary measures to prevent such injuries