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Its well documented that following multiple teeth extraction and the subsequent restoration with removable dentures, the size of the alveolar ridge will become markedly reduced, not only in horizontal but also in vertical dimension and the arch will be shortened.
Following an extraction, there is a 25% decrease in the width of the alveolar bone during the first year, and an average 4 mm decrease in height during the first year following multiple extractions. (Carlson 1967, Misch 2000; Misch 2000)
Tatum and Mischhave observed a 40%-60% decrease in alveolar bone width after the first 2 to 3 years post extraction.
The alveolar process following tooth extraction will adapt by atrophy and an immediate implant in this respect cannot prevent this problems ,and unable to substitute for the tooth.
The problem with type 1 placement is that the bone loss will frequently cause the buccal portion of the implant to gradually lose its hard tissue coverage, and that the metal surface may become visible through a thin peri-implant mucosa and cause esthetic concerns.