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After extraction, and curettage, osteotomy starts in the palatal aspect of each socket. The 1st intraop PA shows that the trajectory at #6 is incorrect (Fig.3). After adjustment, osteotomies look parallel (Fig.4: D: 3.5x20 mm drill; T: 4.5x20 mm tap). This suggests how important it is to use parallel pins to check initial osteotomies for neighboring implants (Fig.3).
Xin Wei, DDS, PhD, MS 1st edition 11/16/2015, last revision 11/16/2015