[The deformed partially edentulous ridge in the area of the anterior teeth and that reconstruction. Part I. Analysis of types of defects by the study casts].

The purpose of the study was investigated the incidence and type of anterior ridge deformities in partially edentulous patients. Furthermore that deformed partially edentulous ridge were investigated which esthetic problem were existence or not, and what type of edentulous ridge have to do the ridge augmentation. A random sample of 94 casts 118 regions was evaluated. The results obtained were as follow: 1. These partially edentulous ridge were measured distance by the divided into Apicocoronal loss D1 and Buccolingal loss W, and relationship between D1 and W was significant. But the relationships of D1 and W weren't found between 1 to 2 missing tooth, and on the presence of the root exposure. 2. The resorption form at the palatal regions of upper differed from lower, remained to alveolar crest on palatal regions. But the resorption form at the Buccal region were similar to upper and lower. 3. Using Seibert's classification, we found that the Class III was the most prevalent deformity (55.1%). The other prevalent defect was discerned the Class 0 (17.8%) greater than Class I (16.1%) greater than Class II (11.0%). 4. An unesthetic pontic-to-ridge relationship observed in an Apicocornal loss or a Buccolingal loss. 5. The surgical procedures for reconstruction to partially edentulous ridges should be carried out the either D1: greater than 3 mm or W: greater than 3 mm. The edentulous ridges which lacked in the either D1: greater than 2 mm or W: greater than 2 mm were considered preparatory application.