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We studied tooth displacement effected by root planing (RP) in an experimental periodontitis. Subjects were 8 beagles.A resin cap was set on the mandibular 3 rd premolar (P 3) , pretreated with pulpotomy, and a bridge splint was set on the mandibular 2 nd and 4 th premolars to measure vertical extrusion. To prevent effects from cheek and tongue pressure, a removable cheek-and-tongue guard was set around both of sides of the lower P 3 except during measuroment.Inflammation group: Experimental periodontitis around the left P 3 was induced by dental floss ligature for 12 weeks in 4 beagles.RP group: Experimental periodontitis around the left P 3 was induced by dental floss ligature for 4 weeks, then RP under local anesthesia at the fourth and fifth weeks in 4 beagles. Teeth were cleaned 3 times a week for the 8 remaining weeks. Control group (healthyinflammation and RP sides) : Periodontal tissues of the right P 3 were maintained by tooth cleaning for 12 weeks. Tooth displacement was determined once a week by measuring the distance from a silicone rubber impression. Clinical parameters: Probing pocket depth ( PPD) , probing attachment level (PAL) , tooth mobility (TM) , and gingival crevicular fluid (GCF) were also measured.Results were asfollows: 1. In the inflammation and RP groups, vertical extrusion increased pregularay.2. In the RP group, vertical extrusion PAL, and TM appeared to increase promptly after RP and decreased to a steady phase 2 weeks later.3. PPD and GCF appeared to decrease promptly after RP. Our results suggest that vertical extrusion is effected by inflammatory condition and RP. J Jpn Soc Periodontol, 44: 148-158, 2002.

Kyusyu Dental College ， Kitakyusyu ， JapanThe purpose of the study was to investigate whether tooth mobility affected on response of periodontal pockets following non − surgical periodontal therapy ． Twenty patients with moderate to advanced periodontitis were selected ． The following clinical parameters were recorded by five examiners ； probing pocket depth ( PPD ) ， probing attachment level ( PAL ) ， tooth mobility and bleeding on probing ( BOP ) ． Non − surgical treatment consisted of plaque control ， scaling and root planing was performed ． AU teeth were divided into two groups of slight mobihty group ( Miller ' s Index ： 0 ， 1) and severe mobility group ( Mnler ' s Index ： 2 ， 3)． Furthermore ， for each groups ， all sites were classified into three severity categories according with initial PPD ： PPD ≦ 3mm ，3mm ＜ PPD ≦ 6mm ，6mm ＜ PPD The amount of change of PPD and PAL for each pockets were compared between two groups ． The results showed that the slight mobility group ， compared with severe mobility group exhibited significantly greater amount of reduction of PPD and gain of PAL ． It was suggested that tooth mobility affected on healing response of periodontal pockets following non − surgical treatment ．

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