Free excerpt - SAC Classification in Implant Dentistry

3 RISKS IN IMPLANT DENTISTRY

8 mm**

11 mm

4 mm*

7 mm

* Space required for locator and housing ** Distance to cingulum in anterior

Fig 64. Minimum interocclusal space requirement: Crown (anterior, posterior) and fixed dental prosthesis (FDP).

Fig 65. Minimum interocclusal space requirement: Overdenture (individual attachment, eg, Locator, Novaloc).

14 mm

15 mm

12 mm*

8mm*

*Distance to cingulum in anterior

*Space required for bar, locator and housing

Fig 66. Minimum interocclusal space requirement: Overdenture (bar with attachment).

Fig 67. Minimum interocclusal space requirement: Hybrid (denture tooth, acrylic resin, and framework).

Fig 69. A dual-scan CBCT with an overdenture wax-up (white line) highlighting inadequate interarch space for restoration.

14 mm

11 mm*

*Distance to cingulum in anterior

Fig 68. Minimum interocclusal space requirement: Hybrid (monolithic zirconia).

Examples of adjunctive therapy include:

Similar to the prosthetic volume, it is judged according to the ability to create an anatomically and functionally cor- rect restoration which will provide desired esthetics and durability. If this is readily achieved, it is of low risk; if space is compromised but possible to resolve without adjunctive therapy, it is associated with moderate risk. An inadequate space that requires adjunctive therapy to achieve adequate space is a high-risk procedure.

• Orthodontics (intrusion of opposing dentition) • Restoration of the opposing arch • Surgical intervention (bone reduction or bone grafting) • Jaw surgery Major complications arise in situations where implants have been placedwith improper planning for adequate interocclu- sal space for the planned restoration (Figure 69). In these sit- uations, if no other alternative restorative option exists, the implants will need to be removed and space then created.

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The SAC Classification in Implant Dentistry