Autotransplantation with tooth replica: Technical note.

INTRODUCTION: Dental autotransplantation is a surgical procedure that involves the implantation of a tooth with incomplete root development to replace an injured or missing tooth. An initial surgery was performed to attempt orthodontic traction without success after 6 months. TECHNIQUE: Preoperative assessment included mandibular cone beam computed tomography to visualise two canines. The double autotransplantation technique was performed under general anaesthesia using three-dimensional resin-printed dental replicas. The extra-alveolar time for each tooth was reportedly <1 min, and pulp sensibility was observed 3 months later. CONCLUSION: In the digital era, dental autotransplantation has become an essential part of orthodontic-surgical treatment in children and adolescents with dental agenesis or non-preservable teeth. The use of three-dimensional dental replicas printed from radiological data offers a reliable, reproducible, and valid therapeutic solution with an advantageous benefit/risk balance.

In-house tooth-supported guide for the injection of botulinum toxin into the lateral pterygoid muscle using Blue Sky Plan software: A technical note.

Hyperactivity of the lateral pterygoid muscle (LPM) is one of the theories postulated to explain anterior disc displacement, which can result in difficulty in jaw opening, jaw protrusion, or jaw-deviation dystonias and interferes with mastication, speech, and swallowing. Injection of botulinum toxin of the LPM is considered a conservative therapeutic modality for this condition. The LPM is a deep facial structure and several techniques have been described that use magnetic resonance imaging, arthroscopic, or electromyographic guidance to perform intramuscular botulinum toxin injection safely this to prevent incorrect injection or complications, such arterial bleeding. This study provided a described step-by-step description of the computer-aided design and manufacturing procedure for the fabrication of an in-house guide to simplify the method of botulinum toxin injection in the LPM and ensure accuracy and safety in medical office.

Relationship between facial nerve damage and transbuccal trocar placement: an anatomical cohort study.

The surgical treatment of ramus and mandibular angle fractures is typically performed by intraoral and transbuccal approaches. As these approaches may result in nerve damage, this anatomical study was performed to establish the relationship between the transbuccal trocar position and the likelihood of inducing facial nerve damage. Twenty dissections of the parotid regions were performed after a simulation of surgical approaches aimed at addressing mandibular condylar and angle fractures. Two trocar tubes, ramic and angular, were inserted and left in position throughout the dissection. This procedure allowed the qualitative relationship between the various tube positions and facial nerve damage to be analyzed. The potential risk of contact between the ramic trocar and the facial nerve branches was 90%, while the angular trocar was in contact in 45% of cases. There was no contact with the trunk, cervicofacial division, or temporofacial division of the facial nerve. The contacts occurred at the level of secondary division branches, particularly pronounced for superior and inferior buccal branches, despite the absence of macroscopically visible trauma. Based on these findings, it is proposed that trocars should be used in procedures aimed at addressing subcondylar or angle fractures of the mandible.