Abstract. The present study compared the dentoalveolar development in beagle dogs after palatal repair according to the partially split flap technique and the von Langenbeck method. It was concluded that palatal surgery according to the par tially split flap technique resulted in significantly wider transverse distances of the maxillary dental arch than after the von Langenbeck procedure and that its final outcome closely resembled that of the control group.
The aim of this study was to evaluate the wound-healing process clinically and histologically in growing beagle dogs after palatal repair according to von Langenbeck, with and without implantation of membranes of a copolymer of polyhydroxybutyrate 80%-hydroxyvalerate 20% (=PHB-co-HV 80/20). Von Langenbeck's repair was performed in 12 dogs (age 12 wk), while von Langenbeck's repair followed by implantation of PHV-co-HV membranes was carried out in 11 dogs (age 12 wk). Four dogs (age 12 wk) served as unoperated controls. Standardized intra-oral slides of the palate were taken and measurements of the wound surface areas were carried out. Histological sections were prepared at three different ages. The animals were studied until the age of 25 wk. It was found that wound closure after the von Langenbeck's procedure took about 3 wk, while the use of PHB-co-HV membranes after von Langenbeck's repair resulted in complete wound closure after approximately 7 wk after the membranes had sequestered. At the age of 25 wk, the histologic results after the von Langenbeck procedure showed that the entire scar tissue covering the former denuded bony areas was attached to the bone by means of Sharpey's fibres, while after implantation of the membranes only local scar tissue attachment by means of Sharpey's fibres was found. Further research is necessary to develop a membrane which allows wound closure without sequestration of it.
The aim of this study is to investigate the in vivo behaviour of five different biodegradable films after submucoperiosteal implantation on the palate of Beagle dogs. Non-porous films of poly-(L-lactic) acid (= PLLA), high molecular weight poly-(L-lactic) acid (= HMW-PLLA), poly-(DL-lactic) acid (= PDLLA), poly(~-caprolactone) (= PCL) and a copolymer of poly hydroxybutyrate 80% hydroxyvalerate 20% (= PHB-co-HV 80/20) were implanted submucoperiostally on the palate of Beagle dogs. After 2, 4, 8 and 12 weeks in situ, the structure of the films and the tissue reactions were studied histologically. In terms of mechanical properties and tissue response, the PHB-co-HV film is the most suitable for use on dogs.
Recent animal experiments have shown that palatal repair without denudation of bone leads to a superior dento-alveolar development. The aim of this clinical study was to evaluate the peri- and postoperative course and the dento-alveolar development of the deciduous dentition in Japanese ULCP, and CP patients up to 5 years after two different types of palatal repair. One of the methods, the Kohama (1991) supraperiosteal flap technique, is performed without denudation of the bony palate, while the other, the Wardill (1937) push-back technique, results in areas of denuded bone. It was concluded that the supraperiosteal technique can be performed successfully in approximately the same amount of time as the push-back technique. Re-epithelialization of the wound areas after supraperiosteal repair takes about 1 week, which is one third of the time associated with healing after the push-back technique. Arch depth of the deciduous dentition after the supraperiosteal technique is superior compared to the push-back technique. The question of whether or not the supraperiosteal technique produces more favorable dento-alveolar development than the mucoperiosteal technique in the permanent dentition in humans has to be elucidated in future research.
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