Vinícius Nery Viegas

Transference of virtual planning and planning over biomedical prototypes for dental implant placement using guided surgery

OBJECTIVES This study evaluated the transference of virtual planning and planning over biomedical prototypes for dental implant placement using guided surgery. MATERIAL AND METHODS This experiment was conducted with 11 identical replicas of a human edentulous mandible. For each mandible, models and surgical guides were manufactured using stereolithography. Simulated surgeries were performed on the prototypes. Following this, the implants were placed in the mandible replicas. Superposition of the tridimensional pre- and postoperative models was used for virtual evaluation. The real evaluation was conducted by linear measurements directly on the models. RESULTS The variations in angles and distances between the coronal, central and apical regions of the 22 implants evaluated in this study had mean values <1.45 degrees and 0.41 mm. The correlations between the positions of implant beds in each mandible were fair to very good, according to the distance analyzed and the interpretation guidelines used. CONCLUSIONS According to the results of this study, the variations found in the transference of dental implant positioning to the operative field, determined during virtual planning and obtained in surgeries simulated with biomedical prototypes, confirm the reliability of guided surgery techniques in implantology.

Virtual Planning for Dental Implant Placement Using Guided Surgery

Technical and scientific advances in diagnostic and therapeutic methods in the biomedical field have substantially increased the predictability and longevity of the outcomes of restorative surgical procedures. In contemporary oral implantology, bioprototyping techniques based on computer-aided design and computer-aided manufacturing (CAD/CAM) technology have proven to be valuable aids in diagnosis, treatment planning, and surgical intervention. Among other aspects, use of these technologies improves preoperative planning, makes it easier for patients to understand proposed procedures, increases the predictability of treatment, and may reduce surgical morbidity. The preliminary stages that precede dental implant surgery are as important as the actual operative intervention itself, or even more so. Inadequate placement of implants may injure important anatomical structures or lead to aesthetic or functional compromise of the prosthetic stage of oral rehabilitation. Implant planning and placement can be based solely on computed tomography data and surgical guides fashioned after diagnostic models. However, direct three-dimensional visualization of the surgical site and real-model simulation of the intended surgical procedure can play a significant role in obtaining outcomes that are more consistent with the original treatment plan. Biomedical prototypes, or biomodels, provide faithful reproductions of the patient’s bone condition, thus enabling this type of assessment. Likewise, the surgery itself can be made safer and less invasive with use of individualized surgical guides for implant placement. The development of software programs for implant placement planning and the integration of these software packages with rapid prototyping methods have made fabrication of such guides possible. The process of obtaining and reformatting computed tomography (CT) data, planning implant placement over a virtual model, fabricating a surgical guide with prototyping methods, and using this guide or template during dental implant surgery with specifically designed systems may be referred to as guided implant surgery.

Sentimentos, Percepções e Manifestações de Pacientes e Profissionais Sobre a Cirurgia Ambulatorial de Terceiros Molares

Resumen pt: Objetivo: Avaliar sentimentos, percepcoes e manifestacoes de pacientes submetidos a exodontias de terceiros molares inferiores retidos e dos profissionai...

Modulação do processo inflamatório agudo: terapia medicamentosa e laser não ablativo revisão de literatura

Diverse traumatisms may ori- ginate acute inflammatory pro- cess in anatomic regions treated by Oral and Maxillofacial Surgery. Modulation of this process occurs when initial inflammatory mani- festations overcome the benefit of tissue regeneration. The aim of this paper is to review the relevant literature on modulation of acute inflammatory process and evalu- ate the effectiveness of low level laser therapy on this process. Key words: anti-inflammatory, in- flammation, laser, low level laser therapy.