Abstract
This study histologically evaluated the behavior of bone tissue of rats submitted to osteotomy with conventional diamond burs in high speed and a new ultrasonic diamond tips system (CVD – Chemical Vapor Deposition), at different study periods. The study was conducted on 24 Wistar rats. Osteotomy was performed on the posterior paws of each rat, with utilization of diamond burs in high speed under thorough water cooling at the right paw, and CVD tips at the left paw. Animals were killed at 0, 7, 14 and 21 days after treatment, followed by removal of connective tissue and bone at the area of osteotomy. Specimens were fixated, demineralized, dehydrated and sectioned for histological analysis by polarized light microscopy (25, 100 and 200x magnification) by two examiners. The results demonstrated that there were no differences in the repair of bone defects between the two different materials employed for osteotomy.
Highlights
The restoration of shape, function and recovery of esthetic characteristics of teeth should be the main goals of Restorative Dentistry, yet they should be in harmony with the periodontium to allow adequate oral health (Venturini et al.24, 2002)
Subgingival preparations with cervical extension to the junctional epithelium or underlying tissues are potentially harmful to the periodontium (Sivers & Johnson21, 1995; Melo Filho et al.15, 2000; Venturini et al.24, 2002), leading to alveolar bone loss for achievement of the physiological space required for new attachment of dentogingival joining components (Allen2, 1993)
Osteotomy was performed on the posterior paws of each rat, with utilization of diamond burs in high speed under thorough water cooling at the right paw, and CVD tips at the left paw, constituting two study groups
Summary
The restoration of shape, function and recovery of esthetic characteristics of teeth should be the main goals of Restorative Dentistry, yet they should be in harmony with the periodontium to allow adequate oral health (Venturini et al.24, 2002). The CVD tips are connected to an ultrasound machine, which is very favorable, since the rod performs vibrating instead of rotating motion This allows angulation of the active rod and better access to regions where intact structure must be removed compared to conventional diamond burs in high speed (Vieira & Vieira25, 2002). In the high speed system, the water spray may be obstructed by an adjacent tooth or by a wall of the same tooth, whereas water cooling in the ultrasound flows throughout the active point (Vieira & Vieira25, 2002) This new technology in CVD diamond tips suggests promising outcomes, especially for accomplishment of osteotomy, because of favorable characteristics as less trauma, better cooling and less heat generation, favoring tissue repair. This study evaluated the bone repair after osteotomy with CVD diamond tips compared to conventional diamond burs in high speed
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