Minimum lateral wall heights for conservative class I cavity preparations.

Area of Science:

• Dental materials science and biomaterials
• Restorative dentistry
• Tooth anatomy and morphology

Background:

• Class I cavity preparations are fundamental in restorative dentistry.
• Understanding the minimum lateral wall height (LWH) is crucial for effective cavity design.
• Previous research has not definitively established LWH parameters for specific cavity dimensions.

Purpose of the Study:

• To quantify the minimum necessary lateral wall heights (LWH) for a Class I cavity preparation.
• The preparation was defined as 0.8 mm in width and extending to the dentin-enamel junction.
• Measurements were taken from extracted human permanent posterior teeth.

Main Methods:

• 183 undecalcified sections from 73 posterior teeth were analyzed.
• Digital images of fissures were captured, and LWH was measured using a computer-generated device.
• Data was analyzed by tooth type, including mean, minimum, maximum, and frequency distribution.

Main Results:

• Lateral wall heights (LWH) ranged from 1.2 mm to 2.5 mm.
• The mean LWH was 1.925 mm (SD=0.262 mm), with 2.0 mm being the most frequent measurement (18%).
• Seventy percent of LWHs were 2.0 mm or less, and maximum LWH positively correlated with bucco-lingual crown width.

Conclusions:

• The study provides quantitative data on LWH for specific Class I cavity preparations.
• Findings suggest that LWH generally does not exceed 2.0 mm in the tested posterior teeth.
• This data can inform clinical guidelines for conservative cavity preparation in restorative dentistry.