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I was taught not not break the buccal and lingual walls during a class 2 prep on a primary tooth. The following description is from Pinkham's book, Pediatric dentistry 3rd edition. Is this approach old school?
Class II Amalgam Restorations
GENERAL CONSIDERATIONS
The outline form for several Class II amalgam preparations is shown in Figure 21-6. The guidelines given for the Class I preparation should be followed during the preparation of the occlusal portion of the Class II preparation; additionally, there are several recommendations for the proximal box preparation. The proximal box should be broader at the cervical than at the occlusal aspect. The buccal, lingual, and gingival walls should all break contact with the adjacent tooth, just enough to allow the tip of an explorer to pass. The buccal and lingual walls should create a 90-degree angle with the enamel.
(Pinkham, J. R.. Pediatric Dentistry: Infancy Through Adolescence, 3rd Edition. Elsevier, 1999. 23.4.2).
Class II Amalgam Restorations
GENERAL CONSIDERATIONS
The outline form for several Class II amalgam preparations is shown in Figure 21-6. The guidelines given for the Class I preparation should be followed during the preparation of the occlusal portion of the Class II preparation; additionally, there are several recommendations for the proximal box preparation. The proximal box should be broader at the cervical than at the occlusal aspect. The buccal, lingual, and gingival walls should all break contact with the adjacent tooth, just enough to allow the tip of an explorer to pass. The buccal and lingual walls should create a 90-degree angle with the enamel.
(Pinkham, J. R.. Pediatric Dentistry: Infancy Through Adolescence, 3rd Edition. Elsevier, 1999. 23.4.2).