ABSTRACT
Resident standardization training of dentists is a very important program for the dental students , during which they are trained to be capable of analyzing cases logically and carrying out the treatment suitably. The students who study in this period always have a certain level of basic knowledge and with the full passion for clinical practice, so it's important for them to develop the correct clinical thinking method and form a life-long learning habit. However, the traditional teaching models can't catch up with today's more and more divergent and complicated demands of teaching and learning. The new ori-ented teaching models of PBL and CBL may offer us new ways to carry out the resident standardization training more efficiently, simulate the student's passion of learning and gain wider experience in short time, for their student-centered and clinical cases-guided characteristics.
ABSTRACT
OBJECTIVES: The aim of the present study was to carry out an anatomic survey on the goat maxillary sinus in order to provide accurate and definite anatomic parameters for the design of sinus floor elevation and dental implantation studies in this valuable preclinic animal model. MATERIAL AND METHODS: The anatomic topographic structure of the maxillary sinuses was studied bilaterally in 10 adult goats by a gross survey as well as a histological analysis with parasagittal or coronal sections. Then following parameters were defined and measured: (1) maxillary alveolar height (MAH): vertical height from the alveolar crest to the sinus floor; (2) sinus lateral floor width (SLFW): horizontal distance from the lateral border of the anteroposterior bone crest to the sinus lateral wall; (3) infraorbital canal diameter (ICD); and (4) maxillary sinus volume (MSV): the volume occupied by water injected into the sinus. The data were presented with mean + or - SD on both sides. RESULTS: The goat has a maxillary sinus similar to humans, with a slender pyramidal shape that pneumatizes the entire maxilla, and a sinus wall covered with a mucosal lining. From the maxillary sinus floor, there is an anteroposterior bone crest protruding with the infraorbital canal enveloped. It divides the maxillary sinus floor into two parts. The SLFW of the lateral part of the maxillary sinus floor becomes broader, about 5.905 + or - 1.475 mm in the third premolar site, and the MAH increases towards the posterior area, where the maxillary sinus floor is close to the related teeth roots. According to original metrical data, we also proposed a possible operation procedure for sinus floor augmentation. CONCLUSIONS: There is enough space in the lateral floor of the maxillary sinus for dental implantation, and the third premolar area might be a suitable position suggested for maxillary sinus augmentation with simultaneous implant placement in a goat model.
Subject(s)
Alveolar Process/anatomy & histology , Dental Implantation , Maxilla/anatomy & histology , Maxillary Sinus/anatomy & histology , Alveolar Process/surgery , Alveolar Ridge Augmentation , Animals , Goats , Maxilla/surgery , Maxillary Sinus/surgery , Models, AnimalABSTRACT
Objective:To establish peri-implantitis model in beagle dog. Methods:Mandibular first, second and third premolar and first morlar of 5 beagle dogs were extracted. 3 months after tooth extraction,6 branemark pure titanium implants were bilaterally inserted into the posterior mandible in each dog. After healing-abutment connection, cotton ligatures were placed around the healing-abutments and then plaque was accumulated. Clinical and radiographic recording were repeated 1,3 and 5 months respectively after baseline data had been obtained. Surgical recording and pathological changes of peri-implant bone morphology were studied. Results:1,3 and 5 months after the formation of ligature-induced peri-implant inflammation, plaque index,pocket depth and gingival index were singnificantly increased(P
