Biomedical subjects

Denis Bossard

Publications and source records attributed to Denis Bossard.

3 recordsLinked to original sources

PubMed2004

Contributions of reformatted computed tomography and panoramic radiography in the localization of third molars relative to the maxillary sinus.

OBJECTIVE: The aim of this clinical study was to seek an answer to the question of whether CT gives better qualitative and quantitative information as compared to panoramic radiograph when deciding on extraction of upper impacted third molars. STUDY: The study concerned 34 third molars appearing in direct relation with the sinus on the panoramic radiograph for which a CT scan had been recommended. For each case, the panoramic radiograph was compared with the CT scan for 5 evaluation criteria. RESULTS: The CT scan was more precise than the panoramic radiograph by 1.67 mm for measurement of the level of impaction of the third molar, by 12.44 degrees for measurement of the third molar displacement, by 0.74 mm for bone height separating the third molar roots and the sinus, and by 2.26 mm for the length of roots in the sinus. The CT scan was equally accurate for measurement of the distance separating the crowns of second and third molars in 34 cases. CONCLUSIONS: This study confirms the gain in precision for the CT scan as compared with conventional techniques. The CT scan therefore presents advantages when considering the extraction of upper third molars by providing both qualitative and quantitative information liable to bear on the diagnosis and therapeutic management.

Adolescent↗

PubMed2004

CT-assisted surgery in choanal atresia.

OBJECTIVE: To limit restenosis after surgical repair of choanal atresia. MATERIAL AND METHODS: A total of 20 children (age range 3 days to 11 years) with choanal atresia underwent surgical repair using a microdebrider via an intranasal approach. Surgery was guided by CT. Mitomycin was administered at the end of the procedure. RESULTS: An average of 1.7 procedures per child were required. CT combined with peroperative endoscopy revealed postoperative neo-osteogenesis and insufficient bone resection. CONCLUSIONS: CT-assisted intranasal repair led to extended bone resection of the atretic plate, the predominant cause of which was restenosis resulting from neo-osteogenesis.

Child↗

PubMed2002

Computer-assisted navigation system in pediatric intranasal surgery.

OBJECTIVES: To introduce a computer-assisted navigation system and to evaluate its application in pediatric sinusonasal surgery. METHODS: A commercially available wireless passive marker system that allows the calibration and tracking of virtually any instrument was adapted to children and used during pediatric endoscopic sinusonasal surgery. RESULTS: The headset localizer that was initially used in computed tomographic scanning was not well accepted by children. Correlation of the preoperative computed tomographic scan to the actual patient was made possible by a laser device. Setup time was able to be decreased from an initial 20 minutes to 3 minutes. The average recording accuracy was 1.1 mm. The advantages of the system became apparent as experience increased in cases involving sinus polyposis, choanal atresia, nasopharyngeal fibroma removal, tumor biopsy, and minimally invasive maxillary, frontal, and sphenoidal surgery. CONCLUSIONS: The computer-assisted navigation system was used first as a control system and then, as experience increased, as a true surgical guide. Indications for its use also increased. Pediatric intranasal surgery was performed using 2 complementary guides: an endoscopic view and a computed tomographic view of the instrument's position.

Adolescent↗