Atrophic Ridge & Staged Provisionalization 一段式植体5年随访

When the patient returns for implant placement (2nd visit after initial exam), he reveals that he is a dental phobic.  He requests placement of 4 implants in the upper left quadrant, instead of 2.  Narrow ridge is unexpected in the canine and premolar area (Fig.1).  Limited bone height at #13 (Fig.3 arrowheads: sinus floor) is found when initial drills are in place (Fig.2,3).  A 2-piece implant (4.5x17 mm tissue-level) is placed at #10 after extraction, while 1-piece implants are placed at 11 (3x17 mm (tissue-level, 15 °) and 12 and 13 (bone-level, 2.5x14, 12 mm, respectively; Fig.4,5).  In fact the 1 piece implant at #13 is not completely placed (Fig.5).  It is removed, the apical 3 threads are cut off (Fig.6 <, since a shorter implant was unavailable in the office) and the remaining implant is re-inserted.  The insertion torques of the 4 implants are ~ 60, ~ 35, < 35 and 15 Ncm, respectively.  After adjustment (Fig.7), immediate provisionals are fabricated at #10 and 11 (Fig.8, later splinted with composite), while perio dressing is applied around the implants at #12 and 13 and the provisionals at #10 and 11.  There is no nasal hemorrhage postop.  Although the perio dressing is loose 1 week postop (Fig.9), it is not removed.  When the upper lip fissure (Fig.9 <) heals, provisionals at #12 and 13 are planned to be splinted to the other two ones.  Two weeks postop, the upper lip fissure heals, the perio dressing dislodges and the implants at #12 and 13 are stable (Fig.10).  After abutment height adjustment, a splinted provisional is fabricated over these 2.5 mm 1-piece implants (Fig.11).

The patient returns for final restoration 3.5 months postop; it appears that the implants have osteointegrated (Fig.12,13).  After reprep, there is no gross buccal plate atrophy at #10 (Fig.14).

At the time of cementation, the crowns at #11-13 do not contact the gingiva (Fig.16).  One month post cementation, the gingiva appears to have grown coronally (Fig.17). 

Six months post cementation, the tooth #9 becomes symptomatic.  Is it possible that the implant at #10 is too close to the root of #9?  It is asymptomatic after pulpotomy, but the tooth fractures equi/supragingivally.  Two PAs taken while RCT show osteointegration at #10-12 (Fig.18,19).  While the bone density increases at #10 regular implant, there is minimal bone loss around the 1-piece implants 13 months post cementation (18 months postop, Fig.20,21).  The gingiva remains healthy 19 months post cementation (Fig.22).  76岁病人突然打电话说一个植牙牙冠松动，其实9号牙（自然牙）折裂，6，10-13号牙植牙好像没有骨质吸收（图二十三至二十五），10-13牙位牙龈健康（图二十六，行使功能五年）。9号牙牙冠重新粘固后，显示前牙深覆合，深覆盖（图二十七，二十八）。如果再次脱落需要植牙，选择一段式有助于植入和修复，因为植体和基台直径小。两段式植牙相对基台直径至少4，或者4.5毫米，前牙修复显得笨重。由于9，10牙根和植体接近，9号牙植体需要偏小而长，3x14或者15毫米（图二十九）。

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Xin Wei, DDS, PhD, MS 1st edition 09/27/2015, last revision 05/24/2021