ISSN : 0376-4672
Purpose: The purpose of this study is to quantify the depth of enamel cracks using Quantitative light induced fluores cence-digital (QLF-D) and swept source optical coherence tomography (SS-OCT), and to compare the validity of detection methods. Methods: A total of 80 extracted teeth with cracks in the coronal portion or suspected cracks were selected. First, the non destructive devices QLF-D and SS-OCT were taken, and then histological evaluation was performed. Cracks was divided into 4 types with depth of the crack: Sound, Initial crack, Moderate crack, and Dentin-enamel junction (DEJ) crack. Results: As a result of the validity of the crack depth, the SS-OCT showed the highest sensitivity for detecting initial cracks at 0.98, and the lowest sensitivity for detecting DEJ cracks at 0.70. When detected with QLF-D, the cut-off value of the maximum fluorescence loss for detecting initial cracks was 5, and showed a sensitivity and a specificity of 1.00. Conclusions: The application of SS-OCT and QLF-D in diagnosing cracked teeth will not only be effective in detecting early stage cracks, but will also help to establish an appropriate treatment plan for crack progression.
Objectives: This study aims to compare the push-out bond strength of fiber posts luted with self-adhesive resin cement with various pretreatments. Materials and Methods: Twenty-one single-rooted human premolar teeth were treated endodontically using a Ni-Ti rotary file and obturated with gutta-percha points and a sealer. The post room was immediately prepared to a depth of 12 mm with a post drill, while the teeth were divided into three groups: 1) no pretreatment (control); 2) pretreatment with 17% ethyl - enediaminetetraacetic acid (PE), and 3) pretreatment with 32% phosphoric acid (PP). Self-adhesive resin cement (G-CEM LinkAce) was applied directly to the post room. After application, a fiber post (LuxaPost) was immediately seated and light cured for 40 s. The specimens were transversally sectioned to measure the regional push-out bond strengths. Results: The push-out bond strength was highest for all groups in the coronal parts and lowest in the apical parts (p<0.05). No significant differences according to the pretreatment were observed in the coronal part and middle parts. However, in the apical part, a significant difference was observed between the control and PE groups and between the control and PP groups (p < 0.05). Conclusion: Considering the limitations of this study, pretreatment with EDTA or phosphoric acid did not improve the push-out bond strength of fiber posts cemented with self-adhesive resin cement.
Peri-implant diseases are prevalent with a weighted mean prevalence rate of 43% across Europe and 22% across South and North America. Although the main etiologic agent is bacterial biofilm, various factors influ ence the initiation and progression of the disease. Unfortunately, the treatment of peri-implant diseases is at best favorable in the short term with a high rate of persistent inflammation and recurrence. Therefore, it is sensible to consider and control all potential factors that may predispose an implant to peri-implant tissue inflammation in an attempt to avoid the disease. If periodic maintenance treatment is not performed, there is a high probability of recurrence of the disease and can lead to the loss of the implant.
Globally, as dental implant treatment for edentulous areas increases, implant complications are also increas ing. The adverse prognosis of implants arises from esthetic, biological, and mechanical complications. Several methods reported to manage and resolve these complications are often insufficient to improve the pathological condition or satisfy patient satisfaction. In this case, implant removal should be considered. The traditional implant removal method based on the tooth extraction method has been widely used, but now, a minimally invasive surgical method based on 'reverse-torque' has been introduced. With this new method, soft and hard tissue around the implant can be preserved. In several literatures, it has been reported that the survival rate of implants repositioned in the failed site is high. Despite these results, dentists must carefully consider whether implant repositioning can meet the functional, biomechanical, and aesthetic needs of the patient before making a decision. When considering reimplantation, surrounding soft and hard tissue grafting should be considered, and it is important to understand the type of alveolar bone defect. However, if knowledge about the biological phenomena and volume changes occurring at the implant removal site is insufficient, the dentist's decision pro cess of treatment plan becomes complicated and difficult. Also, in most cases, the treatment plan is determined simply by relying only on the clinical experience of the dentist. This review aims to provide information on dentists' treatment planning decisions for failed implants. In addition to this, we would like to emphasize the importance of understanding the physiology of alveolar bone along with various considerations for implant removal methods and reimplantation.
This study aimed to review the current research on dental implants published in Korea using Korea Citation Index (KCI). From 2002 to May 2022, a total of 1634 papers were published. The studies related to dental implants were the most published by The Korean Academy of Prosthodontics, The Korean Academy of Peri odontology, The Korean Association of Oral and Maxillofacial Surgeons, The Korean Association of Maxil lofacial Plastic and Reconstructive Surgeons, and the Korean Dental Association. More than 1100 papers were categorized as dentistry and the subject of the studies were 1) anatomy related to dental implant surgery, 2) implant materials and surface treatment, 3) implant success/failure, 4) dental implant surgery and bone grafting procedures, 5) dental prosthesis, 6) peri-implantitis, 7) quality of life-related to dental implants and 8) dental implants related to orthodontics.
