The clinical effect of root amputation in the treatment of periodontal/alveolar abscess / 华西口腔医学杂志

<p><b>OBJECTIVE</b>To study the clinical effect of root amputation in the treatment of periodontal/alveolar abscess teeth with one severe lesion root.</p><p><b>METHODS</b>30 periodontal/alveolar abscess teeth with one severe lesion root were chosen in the study. After root canal treatment, supragingival scaling, subgingival scaling and root planning, occlusal adjustment were done. Then the teeth were treated by root amputation. The clinical effect was evaluated 3 months, 6 months and 1 year after surgery.</p><p><b>RESULTS</b>One year after surgery, 27 of 30 teeth were successful, 1 mandibular molar occurred root fracture, 1 mandibular molar was removed because of tooth loosening secondary to periodontal damage. 1 patient lost.</p><p><b>CONCLUSION</b>Root amputation is an effective solution of periodontal/alveolar abscess.</p>

Experimental study on the potential role of BME-10X collagen/hydroxyapatite bone graft in periodontal tissue regeneration of beagle / 华西口腔医学杂志

<p><b>OBJECTIVE</b>To evaluate the potential role of BME-10X collagen/hydroxyapatite (HA) bone graft in periodontal tissue regeneration.</p><p><b>METHODS</b>Four 18 months old male beagles in the experiment were treated with non-surgical periodontal therapy. At the sites of mandibular 3rd and 4th premolars at the time of dogs were treated with non-surgical periodontal therapy one week later, the teeth with the same name in the same jaw were selected to the experimental group (T group) or the control group (C group) at random. The defects in T group were filled with BME-10X collagen/HA bone graft while the defects in C group were filled with nothing. The dogs were sacrificed in twelve weeks and analyzed by histopathology.</p><p><b>RESULTS</b>The defects in T group got more tissue regeneration compared with the defects in C group. The height of new bone (NB) was (3.01 +/- 0.14) mm in T group versus (1.32 +/- 0.11) mm in C group (P < 0.05). The height of new periodontal ligament (NP) was (3.12 +/- 0.19) mm in T group versus (1.35 +/- 0.12) mm in C group (P < 0.05). The height of new cementum (NC) was (3.30 +/- 0.15) mm in T group versus (2.70 +/- 0.12) mm in C group (P > 0.05). The new tissue guided by the bone graft was the same as the normal tissue in histopathology analysis.</p><p><b>CONCLUSION</b>The results of the study suggest that BME-10X collagen/HA bone graft is a good bone graft for periodontal tissue regeneration.</p>

Evaluation of Reference Planes Related to Wits Appraisal Measurement / 中国医师杂志

Objective To investigate the reliability and validity of three reference planes used in Wits appraisal measurement in evaluation of sagittal jaw relationship. Methods Lateral cephalo-radiography was performed before and after treatment in 25 patients with class Ⅱ division 1 of four premolars extraction. Wits appraisals were measured using the functional occlusal plane(FOP), bisected occlusal plane(BOP), and maxillary-mandibular bisector (MMB), respectively. The effect of different reference planes on Wits appraisals was analyzed. Results FOP and BOP showed a statistically significant change in their cant after treatment(P0.05). MMB Wits had the highest correlation with ANB angle (r=0.79, P