Auxiliary Reflectance Sensor for Guided Surgery with Dental Implants: In Vitro Study

Abstract

Objectives The aim of this research was to develop a sensor of approximation by reflectance for guided surgery with dental implants without flap detachment, and verify the effectiveness of this system. Materials and Methods Ten models of total edentulous arches were divided into two groups. Two implants of 3.5 × 11.5 mm (NeoDent) were inserted in each model; in Group 1 (G1), a stereolithographic guide NeoGuide system was used. In Group 2 (G2), the experimental approximation sensor was used for the insertion of the implants. The evaluation of the results was performed by overlapping the virtual planning images with the tomographies of the models of the implants inserted. Results There were no statistically significant differences between the guide and the sensor groups. The averages and standard deviations observed at the angulation of the guide was 4.15 (2.65 degrees) and 5.48 (2.85 degrees) at the sensor. The linear deviations at the cervical level were 0.002 (1.37) and 0.11 (1.47) mm and at the apical level 0.19 (1.28) and 0.21 (1.42) mm, respectively. Conclusions The use of a guide is important for the stabilization of the drills; the greatest challenge is to control the apical position of the implants, especially in highly reabsorbed edges. The experimental sensor can become an auxiliary tool to the stereolithographic guides; however, several difficulties must still be overcome to recommend the use of a sensor. AbstractKeywords ► computer-assisted surgery ► dental implants ► ambulatory surgical procedures ► tomography ► X-ray computed

Evaluation of 3d Printed Stents for Guided Intrabony Maxillofacial Biopsies

“…However, problems during the surgery are quite unlikely (19). Our understanding of guided surgical methods is useful in oral and maxillofacial surgery, where precise bone drilling is necessary for successful surgeries such as apicoectomy and tooth auto transplantation (20). In conclusion, assuming there are no budgetary constraints, a template-guided jawbone biopsy appears to offer an alternative to the standard procedure.…”

Assessment of Deviations of Implants Installed with Prototyped Surgical Guide and Conventional Guide: In Vitro Study

“…27,31,32 Therefore, the higher precision on implant placement using the guided surgery technique observed in this study, and its satisfactory clinical performance suggests that guided surgery presents advantages over the conventional one because it allows the following: (1) reducing errors associated with conventional freehand implant placement; (2) reducing the risk of affecting critical anatomical structures; (3) performing a less invasive and flapless surgical approach, reducing postoperative complications and discomforts; and (4) integrating prosthetic planning and the implant installation procedure. 13,29,[33][34][35][36][37][38][39][40][41][42] However, the guided surgery technique involves a complex planning susceptible to errors that may result in deviations between the positioning planned and the postoperative location of the implant. 15,33,43 The accuracy in implant positioning using guided surgery was assessed in a meta-analysis that showed a mean horizontal deviation of 1.1 to 1.6 mm and angulation of 5.26 degrees observed in clinical, in vitro, and cadaver studies.…”

“…Vercruyssen 30 and Lopez et al 42 report in their studies that the biggest challenge of guided surgery is deviations in the apical level (depth). In this way, precautions should be taken regarding the maximum deviations in the apical level of implants installed close to critical anatomical structures.…”