Page 104 - Ebook_V01
P. 104

µÒÃÒ§·Õè 1 ࡳ±ÊÓËÃѺ¡ÒõÃǨ¿˜¹ µÒÁ Root surface severity index



                        ÃËÑÊ                             ࡳ±ÊÓËÃѺ¡ÒõÃǨ¿˜¹

                 1   Incipient        ÃͼØÃÒ¡¿˜¹ÃÐÂÐàÃÔèÁáá à¢Õ贌Ǡexplorer áŌǹÔèÁËÃ×Í¢ÃØ¢ÃÐ äÁ‹ÁÕ¡ÒÃÊÙÞàÊÕÂ

                                      ¼ÔÇà¤Å×ͺÃÒ¡¿˜¹ ÍÒ¨à»ÅÕè¹ÊÕ à»š¹ÊÕ¹íéÒµÒÅËÃ×ÍàËÅ×ͧ͋͹


                 2 Shallow            ÃͼØẺµ×é¹ à¢Õ贌Ǡexplorer áŌǹÔèÁËÃ×Í¢ÃØ¢ÃÐ ÁÕ¡ÒÃÊÙÞàÊÕ¼ÔÇà¤Å×ͺ

                                      ÃÒ¡¿˜¹ ÅÖ¡¹ŒÍÂ¡Ç‹Ò 0.5 ÁÁ. ÃÍÂâäÍÒ¨à»ÅÕè¹໚¹ÊÕ¹íéÒµÒÅࢌÁ



                 3   Cavitation       ÃͼØ໚¹â¾Ã§ à¢Õ贌Ǡexplorer áŌǹÔèÁ ÃͼØ໚¹â¾Ã§Å֡ࢌÒä»ã¹à¹×éÍ¿˜¹
                                      ÁÒ¡¡Ç‹Ò 0.5 ÁÁ. ᵋäÁ‹¾ºÃͼطÐÅØâ¾Ã§»ÃÐÊÒ·¿˜¹ ÃÍÂâäÍÒ¨à»ÅÕè¹໚¹
                                      ÊÕ¹íéÒµÒÅࢌÁ




                 4 Pulp               ÃͼطÐÅØâ¾Ã§»ÃÐÊÒ·¿˜¹
                     involvement





               ËÁÒÂà赯 ËÒ¡ÁÕËÅÒ´ŒÒ¹¢Í§ÃÒ¡¿˜¹ ãËŒ»ÃÐàÁÔ¹´ŒÒ¹¢Í§ÃÒ¡¿˜¹·ÕèÃعáç·ÕèÊØ´































                  Grade 1                  Grade 2                 Grade 3                  Grade 4
                 Incipient                 Shallow                Cavitated           Pulp involvement






                            ÃÙ»·Õè 1 áÊ´§ÃдѺ¤ÇÒÁÃعáç¢Í§ÃͼØÃÒ¡¿˜¹ ¢Í§ Billing, 1985




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