PurposeThe concept of gingival biotype has been used as a predictor of periodontal therapy outcomes since the 1980s. In the present study, prospective and controlled experiments were performed to compare periodontal pocket depth (PPD) reduction and gingival shrinkage (GSH) after scaling and root planing (SRP) according to gingival biotype.MethodsTwenty-five patients diagnosed with chronic periodontitis participated in the present study. The PPD and GSH of the labial side of the maxillary anterior teeth (from the right canine to the left canine) were evaluated at baseline and 3 months after SRP. Changes in the PPD following SRP were classified into 4 groups according to the gingival thickness and initial PPD. Two more groups representing normal gingival crevices were added in evaluation of the GSH. The results were statistically analyzed using the independent t-test.ResultsIn the end, 16 patients participated in the present study. With regard to PPD reduction, there were no significant differences according to gingival biotype (P>0.05). Likewise, sites with a PPD of over 3 mm failed to show any significant differences in the GSH (P>0.05). However, among the sites with a PPD of under 3 mm, those with the thin gingival biotype showed more GSH (P<0.05).ConclusionsPPD changes after SRP were not affected by gingival biotype with either shallow or deep periodontal pockets. GSH also showed equal outcomes in all the groups without normal gingival crevices. The results of SRP seem not to differ according to gingival biotype.

Purpose: Since endosseous implants are used for the treatment of various types of tooth loss, they are considered a primary therapeutic options. Many studies regarding implant survival rates have been published. However, there have been few long-term studies on implant survival rate in Koreans. Therefore, the aim of this study was to examine implant survival rate for 8 years as well as identify potential risk factors for failure. Materials and Methods:The present study included 535 implants in 332 patients at the Department of Periodontology of Wonkwang Dental Hospital. By means of a chart review, 1) implant site, 2) age and sex of patients, 3) diameter and length of placed implant, 4) advanced technique at recipient site, 5) periodontal treatments before implant therapy, and 6) systemic diseases such as diabetes mellitus, hypertension, or osteoporosis were recorded. The effects of evaluated variables on implant failure were analyzed using chi-square test. Statistical significance was accepted at p<0.05. Results: The present study showed an implant survival rate of 97.76%. Overall, 12 of 535 (2.24%) implants were explanted. Two explanted implants were in the maxillary anterior area, five were in the maxillary posterior area, and five were in the mandibular posterior area. The average time from placement to explantation was 11.92±15.30 months. None of the investigated factors was significantly associated with implant failure (p>0.05). Conclusion:Survival rate in this study was 97.76%. Despite the lack of significant association between implant failure and associated factors, there are potential risk factors. Cautious diagnosis and treatment planning are needed.

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Purpose: The treatment of gingival recessions is needed to reduce root sensitivity and improve esthetical satisfaction. Several surgical techniques have been proposed to achieve these goals. The use of connective tissue grafts has made esthetic root coverage a predictable procedure. Numerous clinical studies have represented that using connective tissue grafts to cover exposed root surface showed high success rates. This is a case report which demonstrates the technique to obtain root coverage of a buccal recession defect. Materials and Methods: A 35-year-old patient with a high level of oral hygiene was selected for the study. This patient had one ClassMiller recession defect in the mandible. A coronally advanced flap in combination with the connective tissue graft was chosen for the treatment. After surgery, the patient was told to visit the hospital once a week for his oral management and professional prophylaxis. The depth of initial recession was 4.0 mm. Result: After three months, it reduced to 0.0 mm, and the average recession reduction was 4.0 mm. The average root coverage was 100%.

Purpose:In the present study, we present clinical and radiological grounds as well as principles of tooth extraction based on tooth extraction cases in the Department of Periodontology at Wonkwang University Dental Hospital. Materials and Methods: This study was conducted on 323 patients who visited the Department of Periodontology at Wonkwang University Dental Hospital and underwent tooth extraction. Their medical records and radiographs were surveyed, along with smoking habits, systemic diseases, medication/tooth mobility, and probing depth. Crossover analysis was performed to examine the interrelationship between smoking and its causes. Results: A total of 620 teeth was extracted. The proportion of smokers in patients who underwent tooth extraction due to periodontal problems was higher. However, there was no statistically significant difference (p>0.05) between periodontal problems and other problems. A total of 383 (61.77%) showed periodontal problems: "floating state" or loss of attachment in entire roots (radiolucent images with average width of about 2.65 mm surrounding roots), which was a typical example of extraction with periodontal problems (193, 50.39%). A total of 106 (17.10%) showed prosthodontic problems: 55 (51.89%) showed crown loss, and average length of retained roots was 9.98 mm as measured on radiographs. A total of 97 (15,65%) had conservative or endodontic problems: deep caries, shifted beyond cemento enamel junction (CEJ) to root area (boundary of root apex of caries were presented above the average of 3.92 mm from CEJ toward root apex). A total of 34 (5.48%) cases had orthodontic and other problems. Conclusion: For proper prognosis of individual teeth, generalized judgment based on collected patient information, and treatment philosophy of clinicians will be required.