Final answer:
The best cement for improving retention of a short crown is typically glass ionomer cement due to its ability to chemically bond to tooth structure. Resin-modified glass ionomer or adhesive resin cements are also good options for increased strength and are beneficial for preparations with limited retention.
Step-by-step explanation:
The best cement to improve retention for a short crown in dentistry can be a subject of debate, but generally, glass ionomer cements are considered effective due to their chemical bond to the tooth structure. For improved retention, one might also consider using a resin-modified glass ionomer or an adhesive resin cement, particularly if additional strength is required or if the crown is subjected to high stress. Preparations with limited retention benefit from these types of cements because they can provide both mechanical and chemical adhesion to the tooth surface. Surface treatments such as sandblasting or etching with hydrofluoric acid might be used before cementation to increase the surface area for bonding and to improve the retention of the crown.